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Comprehensive Correction of Corroded and Collapsing Culverts

Summary

The benefits of slip-lining with Snap-Tite and Spirolite to rehabilitate ailing culverts – detailing the low-impact, long-term solution that improves on the original.

Discover:

  • The positives and negatives of other culvert solutions
  • How Spirolite and Snap-Tite address all aspects of culvert failures
  • The longevity and improved flow rates of Snap Tite and Spirolite
  • The minimal environmental impact of Snap-Tite and Spirolite
Transcript

David Hundley 

Hi, welcome to another episode of ISCO’s insights. My name is David. And I’m excited to be here today. I want to welcome back anybody who has been on the website, the webinars before this one, we did a lot of great subjects over the years. And excited about this one today. Today’s episode is specifically on coal recover rehab. And I’m really excited about about what we have to offer, we got about 45 minutes of discussion, plenty of time for q&a. So let’s, let’s get right to the instructions for today. So you guys are all turned off on video and audio just enhanced the quality of our presentation today. If you’re having any issues right now, the chat function, be a good one. Jump on that. Let us know if you’re having any issues. And of course, we’ve got time today for q&a, we always build in time. And we will do our best in real time to answer those if it’s appropriate to that subject. And if we miss anybody along the way we’ll try to capture at the end. Of course, we missed you at the end, we will, we will certainly follow up and answer any questions that you have. All right. As I stated, I’ll be the host today. Excited about the subject. I worked in our silver lining, Culvert rehab, Snap-Tite division for about five years. So it’s been about seven or eight years since since since I remember. Most of them are now old. And so I’m happy that I’ve got a couple of the subject matter experts with me today. I’d love to introduce and the first one is Stephen Boggess.

Stephen Boggess 

Hey, David. Thank you. So I’m actually going to call you out right off the bat, because part of my intro is the fact I’ve been with ISCO for 12 years, and I’ve been in this position for 10 years. So it’s been 10 years. David Huntley since you were so you did. Exactly, but I can’t thank you for giving me this opportunity and to work with the culprit. Lonnie team, we deal primarily with the Snap-Tite and the spotlight product lines for ISCO. But the unique thing about our group is we do covert lining and covert rehab all day every day. And one of the key components to our team is Don McGriff. And Don, I’ll let you take take over there with our other

Don McGriff 

post. Thanks, Stephen. Yeah, my name is Don McGriff. I’ve been in the polyethylene world about 30 years, primarily in technical roles with ISCO. I’ve done a number of different things beyond the traditional industrial municipal markets have worked with landfill, geothermal, nuclear and coal rehab. And that’s led me to involvement with a number of different organizations from ASTM ASME. ASCE, the TRB and ash toe most recently, and you know, I based out of Huntsville, Alabama, so I’ve covered a lot of se se but kind of work Parts Unknown David, so I got to go anywhere they need me.

David Hundley 

Yeah, absolutely. And I’m proud of you didn’t say one thing about Alabama football. Did

Don McGriff 

not I was gonna say I’m from Alabama. And so please bear with me with my intelligence level. But it did say at a Holiday Inn Express last night so nice. Nice. Well, let’s

David Hundley 

start this guy’s with a getting to know our audience a little bit. We’d love to take polls and, and kind of get a little bit of a, an idea on where we’re at with the audience. We’ve got several guys join us for the first time, like I said, and some some repeats, but we’ll take these bowls and hopefully have our discussion catered towards some of the some of the responses. So give it another second here. All right. Well, looks like we got a lot of people who are here just for the covert rehabilitation, a few working on a project related got some challenges on several and interested in sustainable infrastructure solutions. So good. We got a great mix of, of audience and level of CULVERT rehab knowledge. So let’s kick it off. Stephen. Tell me a little bit of why we are here to discuss culverts. Why is this so important in today’s infrastructure? Sure,

Stephen Boggess 

David. So as you may hear a lot about infrastructure and, and the state of infrastructure in the US. culverts are a big part of that. So, as you see on the screen, there have been several studies through the years addressing culverts, California, Oregon, they’re listed where 1000s and 1000s of culverts that are in their inventory that need to be addressed and that are only getting older every day. And in fact, ASCE does the infrastructure report card every four years and culverts fall under bridges which is a c minus on the report card and has been consistently consistently stormwater D on the report card of transportation, road construction again, D. So the need is out there. The good thing is, from a funding perspective, we’re starting to see more funding, we’re starting to get more people call us with inquiries about culverts, culvert rehab, put our options. And whether it’s in federal level with the infrastructure bill coming through at the state level, there’s more funding, so we’re just seeing more opportunities. So we get a lot more questions. That was a great time to put this topic out there for folks to have a better understanding of what their options are when they have to address commerce.

David Hundley 

Right. And we, we certainly are chasing down projects around the country. You know, a very active on a daily basis. But we’d love to know, a quick poll again, if you guys are experiencing any funding in your areas, of course. So let’s take another quick poll. I hope everybody can see this. All right, so that great. Hold on. Did I mention this was the first time I posted this?

Stephen Boggess 

First time on a computer? David? Yeah. It’s

David Hundley 

the first time I’ve experienced this. So. So moving on. The Moving on, we’re gonna move to don don, give us a little background on on culverts and assessing culverts, I’d love for you to jump in and take it

Don McGriff 

away. No problem, David. So, we want to start back a little bit, maybe we go a little bit too elementary. But a culvert is basically a conduit for transporting groundwater or stormwater water runoff from from one side of an infrastructure to another. So we’re typically talking most time about a roadway, sometimes we’re talking about a railroad, but even in airports and runways and levees, where we have the drainage structures, that will will still have some sort of covert type of process. So we’re talking about things that go as far back as clay or brick. And then you get as time evolved, we get a little bit newer materials RCP, which is reinforced concrete pipe or CMP, which is a corrugated metal pipe. And, and then within the last 20 or 30 years, you’re seeing corrugated plastics, typically, you’re going to see them in a number of different shapes, primarily round, but you will see the oval elliptical arch type configuration in box culverts. So when we were looking at and assessing all those culverts as far as trying to figure out the current state of the infrastructure and what to do with them.

David Hundley 

So I just grabbed this picture in was looking at it earlier. And clearly the question is repair or replace wash floor. This is a replace and I write down.

Don McGriff 

Well, David, it’s not as simple as that, you know, we love that you said bottom there, you think there’s not much we can do with that we got to really dig it up. And there may be some instances where replacing makes sense. This is not in this case, but in some cases there collapse, there’s going to be instances where you want to enlarge capacity, you want to go maybe from a 24 inch culvert to a 48 inch for hydraulics or or even replace it with a bridge, there’s going to be instances where you may have an aquatic or ecological concern that dictates a change in how that roadway crossing or other infrastructure gets, you know, from one side to the other via, you know, the aquatic life passage. And then you know, there’s just it’s this is where it’s shallow, and it’s low volume roads. And in those in those cases, it might make sense just to be convenient to replace, but you see a list of variables there, you’re probably gonna be focused a lot on hydraulics that draws a fair number of decisions, there’s gonna be the the focus on the structural, you know, can can we deal with what we’ve got? Or can we rehab it and such that we’re confident was structural. And then there’s going to be the combined of design life and cost, how much does it cost me? And what does it get me for for life? So there’s a number of variables and we’d like to basically say you need to have a number of tools in your toolbox to be able to address these issues. So I

Stephen Boggess 

did want to point out from this picture, we absolutely can repair that prepare that that can be rehabilitated, and that’s one of the things that think that especially folks that don’t have a lot of experience, assessing or dealing with culverts are quick to assume in a situation like that it has to be replaced because definitely even some worse than that. We’ve seen rehabilitated and then the other component to that is when you are rehabilitating and you can see there in the picture. little bit there on the right the void out area. So we know behind that the walls that hose pipe that there are voids. And so as you look at your rehabilitation options, and Donald talk about some of these, you know, that’s something you have to consider what’s outside of the pipe as well as what’s on the inside of the pipe?

David Hundley 

Yeah. Great job, Stephen. And then just a reminder, at this point, we do have the q&a open, and we’d be happy to take any questions along the way. Again, we can we can, we can grab them at the end of this presentation. But please, please participate. And you have any questions we’d love to we’d love to answer them. So all right, Don, we’re going to move on to some solutions. You are or Stephen, tell us what’s what’s the what’s the best way to start this?

Don McGriff 

Yeah, so we’ve categorized these kind of and three different buckets, so to speak. And there’s some things that can be done. We call them spot repairs, these are things that don’t address the full culvert, we’re going to be looking at things like a paved invert that you see in the picture here, where you can address the bottom of the culvert. And that’s going to give you an extended extend the life but you know, not necessarily get the full life of maybe the the existing host, you can deal with some things like joint sales, where you have a separation of joints, the pipe may be new, but the joints have separated. And those are typically typically going to be non structural, but they’re going to seal against any leaks. And then you can also seal with things like grouts that deal with soil stabilization and WATERSTOP issues where you might address a crack or a joint separation again, but we’ll move on to there, something to a close fit line. And a close fit liner is a designation that we get from the Corps of Engineers, and it’s particularly a useful designation, in the fact that, you know, it’s, it’s, it’s something that fits up against the idea of the existing pipe. Typically, people choose close fit liners, because they think of it as having a superior hydraulic advantage, which does have some hydraulic advantages, but it’s not all that’s there. Typically, these are not going to involve grab, they’re going to be up against the wall. So if there’s going to be any addressing route, and you have to do it beforehand, and they’re going to typically involve specialized equipment.

Stephen Boggess 

So in those cases with the grout, typically, that would be a man entry scenario where they can insert graph,

Don McGriff 

yeah, so you would have to have a mandatory to to be able to dress that crash. So if we move to the curative place, you know, this is typically going to involve insertion, insertion of a tube or a sock, as they call it, they’re typically going to involve something that’s resonant, impregnated, you know, vinyl esters, polyesters, epoxies, are typically the common resins that are used, you would insert this into typically works well, in a closest what we mean by closed system is manhole, manhole, catch basin, the catch basin where you don’t have the access that you might need for for other methods, you’re going to insert that and then add a heat component or curing component, sometimes it’s UV. Typically, the industry recognizes this as a fifth year design life. But you know, you’ve got to have a structural, you’ve got to address this in your specifications, whether this is structural and non structural. And there’s some deep dives into that, you know, whether they’re partially deteriorated or fully deteriorated. And I would just tell you that I read one article that I believe it was either the Center for underground infrastructure, education, research and education. And they basically said that CIP is a it’s a support, but it’s not necessarily structural, you know, it’s a reinforcement, but it’s not fully structural. And so you’ve got to, you’ve got to be sure of what you’ve got from a structural component, and be confident that so the specifications match up to that. And the

Stephen Boggess 

key there is to make sure all that information is included in the specifications. Correct? Correct. Yeah. One other thing on the cured in place that comes up a lot, where we get the question is related to bends and curves. undulations severity of that and aligner versus some of the other methods.

Don McGriff 

Yeah, so I mean, any bend any change in direction is going to be a challenge, in some way for most lighting situations, say a cure to place. If the band is pretty aggressive, then you’re gonna see a flap that forms typically on the short end of the angle, where you might have a chicken flap or something that hangs down. When you do some other methods. It’s going to have the same thing for a ladder system matter. It’s going to create a lot of friction to be able to get through and there’s a comfort level and how much that can be depending upon the material

David Hundley 

that was gonna wait to to bring this question You know, we do have one question, and I’m guessing it’s for the slip line, but I’m gonna throw it out to you, Don. Okay, so is it possible to use a liner on a 60 inch 15 degree bend? Located 100 feet from the entrance of the culvert, I think I hope I answered asked that question. Right.

Don McGriff 

Yeah, that that’s going to be it potentially as a challenge, I’m not going to say it, it depends upon where you’re going to have access points and and, and what size liner, you know, the smaller you go, the more forgiveness you have for, for going around that band. But potentially, it’s going to be an issue. at that angle, you know, something 15 degrees and largest is going to create a lot of friction on that. So the next one is a similar type method called fold and form typically involves a thermoplastic pipe, but most of the time, it’s going to be PVC, sometimes polyethylene. And as you can see, here, it’s extruded round, but it’s deformed, typically folded into some sort of U shape. And then when you get to the field, it’s rerouted with a controlled steam or pressure process. And so when it’s expanded, it’s meant to fit, you know, up against the it just the same way that CIP would, but you’re typically going to deal with diameters that are 36 inches smaller, they are going up a little bit larger these days, and attempt. But important to note that the difference between a CIP p and a fold and form is the CIP when the heat is added, that’s to actually cure it, you’re gonna pull it in as a flexible nature. For FOTON form, when you’re adding the heat, it’s actually making it pliable, so that you can get it into the hole. And when the heat dissipates, it returns back to a, you know, a hardened form. So while you’re adding heat for different reasons, it ends up acting kind of similar between those two,

Stephen Boggess 

one component with and Don asked me this question, one component with CLPP compared to the fold and form the steam in particular, in the styrene involved in the CIP process, that’s why we’re seeing a lot more UV cured CLPP liners. And my understanding is, that’s not the case with the PVC as far as the stain being applied.

Don McGriff 

No, they’re typically it’s not a release with the folded form PVC, it’s just a matter of making it pliable.

David Hundley 

I’m gonna go back one slide. I think we got an appropriate question for the time. Okay. So Andrews asking in C IPP need to be installed in the drive. So Dr. CULVERT, to the best of your knowledge, what’s your response? Yeah,

Don McGriff 

I’d like to say to the best of my knowledge, because we like to say that there is, for most learning, there’s going to be some amount of D watering that has to be done. I think for the close fit liners, the drier it is, the more likely you are to have success. And if there’s groundwater or water present, it’s potentially going to create some sort of installation issue that you may have to address. So those are best done in the dry and we can talk about with foot liners is that the case as well when we get to the so one

Stephen Boggess 

caveat there. I had a conversation recently where somebody actually did have a CLPP that was installed in a in a wet type scenario, I will say and Don, the presence of water is most concerning in the more northern colder climates where you’re going to potentially have a freeze thaw dynamic. And what’s that going to do to the material?

Don McGriff 

Well, it even if it’s not cold, with a CIP, it’s subject to groundwater, more access to the groundwater, the more pressure it’s putting on that liner. But you know, CIP, it is, you do have to be concerned a little bit with freestall interactions that occur from that groundwater, it’s typically going to create some sort of reaction to the water, especially the thinner it is. So that’s a good point that it is something to be concerned about.

David Hundley 

All right. We’ll move on to the next one. I remember back in my day, the spray in line or I saw a ton of that in the south, it seemed like it seemed like that was a that was a product of choice in a lot of applications back then. So give me a little information on

Don McGriff 

that. Yeah, I think it’s a same thing of groundwater can create a little bit more issues, especially the freeze thaw, but it’s going to be something that it’s sprayed, it’s a cement cementitious or polymer resin. So from the picture, you can see that it can be hand hand sprayed, it can be rotary sprayed, which is probably a good idea in most cases, because at least you have a little bit better control of the amount that’s being applied. You can hand trial it and place it. You’re typically this view this as a larger culvert, something that has room for a man or a person to get in. But, you know, again, you’re going to be challenged with is this a corrosion barrier? Or is it a structural and most people think that it should be a structural and therefore Uh, yeah, the design lab kind of comes questionable, you know, there, I’ve seen 510, I’ve seen 20. I’ve seen 50 I don’t think you get a consensus in the industry. And I’d like to point out something that was in the August issue of underground infrastructure last month, and they were talking specifically about SAP ELLs, and they said the lack of comprehensive standards, design guides, guidelines, testing and evaluation of saps is limiting the acceptance of use, but the OTs and provident did these two renewal pipes. Thus, sufficient information is not available to confirm SAP L is a structural and durable renewable technology renewal technology to enhance the lifespan of gravity and pressure pipes. And so I would say that, you know, a lot of these technologies is, especially for the close fit liners, were born out of early adopters of renewables of water and sewer pipes that were typically small bores, and, and smooth interiors. And so a lot of times, we’re dealing with corrugated shapes, or we’re dealing with disjointed RSVP. And, and big one, honestly, the design guidelines are based upon a round structure. And these things as they’re failing are not round anymore. And so deflection and how the deflection is, is applying the loads become concerns. And so there’s there’s work to be done in industry. I like to compare spray applied as being surcoat. If you’ve got a good structure to a house, you’ve got a good two by four wall and you put stucco stucco on the outside, you’ve created good corrosion. But if you’re if your walls are, are failing, and you put a stucco on it, then you’ve essentially put, for lack of a better analogy, a diaper on a baby, you’ve dressed the outside. And sometimes when you’re putting these coatings on, you’re typically capturing or increasing the amount of corrosion curves to host because it is a barrier against water, it’s not letting water out that may have come through bolts of an arch CULVERT and things like that, where the groundwater deck actually could get into the culvert and then, you know, be channeled away. So you’re, you have these considerations that we’ve seen, that increases the amount of of questions for structural and design life. So

Stephen Boggess 

I think just to kind of capsule what where he was going with that is, everything we’ve seen up to this point we’ve talked about are all applicable to cover repairs, they can all be used and all be used effectively. And you’re going to gain additional life to your culvert, you know, based on based on the option you choose that I think the most important thing with a message would be as an owner and engineer in particular, that you make sure and look at the details of your particular scenario. And especially from the perspective of the structural components, make sure that you’ve included the right design information, your specifications, and that you are getting the structural solution that you’re looking for.

David Hundley 

All right, I got a couple questions, a lot of it coming our way. We’re gonna move on here, just a second to the slip line portion of our presentation. One of the questions on a close fit liner, are they bonded to the base material. And again, I earlier I referenced you as an expert, clearly you’re the expert on slip lining with with with the pipe inside pipe. So best of your knowledge.

Don McGriff 

So a lot of the guidance on those comes from a WWE because they’re dealing with it again from a water or sewer renewal. And they classify three of them as non structural, and therefore they’re non bonded, at least for safe shirt in place non bonded to the liner, or to the host pipe. And the structural would have to have some sort of bond. And typically, you know, there’s an encouragement, at least within the Corps of Engineers documentation is that you know that that existing host has to have some sort of reliable integrity, you know, a lot of voids a lot of holes, a lot of deterioration is not ideal for structural solution. So that’s, that’s from the CIP the close of the fold and form it while it’s it’s expanded out against it, it is not bonding to to the existing it becomes its own ladder, in many cases. Now, it can get some support from existing host and dealing with structural loads, but it’s not relying upon the host itself to create a composite type structure and the spray applied, it definitely needs to be attached, you know, at least to set up it has to have some sort of adherence early on.

David Hundley 

I’m glad to have the questions and yeah, yeah, absolutely. And Thomas was kind enough to point out, you know, as we, you know, SME for CULVERT lining basically. So we certainly don’t want to represent the IPP and if you If any of the comments were, or contradicted the ASC, and please, please, you know, focus go through ASTM. So all right, well, let’s get into the beep taste. And what I believe we are the SMEs, or you guys are in SMEs. And that’s going to be Koberlein. So we’ve, we’ve heard about CLPP, folding forum digging replace, they all seem to have a good place in the market, as Stephen said, tell the audience a little bit about what you know, for slip lining, and why you believe it’s a good choice going forward. Yeah, David. So

Don McGriff 

let’s start with the process of slit lining. That process, at least for the first few steps are going to look similar to to the process for a close fit liner, you’re going to make some sort of assessment of what what you need from my a new, a new line or a new pipe and a new solution, whether that be the length and what you’re going to use. And then that’s probably going to be no matter what you choose some sort of plane in prep of the existing coast, yeah, removing some debris, removing rocks, making sure that you know, any deflections that can be addressed or done. And then you’re going to install a pipe or liner with a liner. In this case, the only thing you have to do then is that curing process, that close fit is going to be a curing or spraying process for the installation. But for slip liner, you know, our steps are going to be the two yellow steps, which is going to be sealing the ends, which we typically call a bulkhead, which we’ll see in that section, the second picture, and then there’ll be some sort of grounding of the annular space, which is filling in that annulus that is created by putting a pipe inside of an existing host. So, you know, this is typically gonna involve a pipe, and that pipe may be any number of different materials HDPE PVC, you see the terms GRP and FRP, which are kind of interchangeable, depending on where in the world you live, but that’s specific, essentially a fiberglass pipe. SRP is steel reinforced polyethylene, which is typically a corrugated exterior, and then a steel, which is used a lot for Arch. So, you know, those certain materials work well for the non circular shapes, the arches, the ellipses, the box, culverts, and specifically the FRP. And the steel options work well, on many of those. Regarding the other materials that are used for slip lining, HCPs, the one we’re going to focus on today, it’s got a range of properties that make it advantageous at a cost that that’s pretty appealing to most. So you’re talking about a material that’s rugged, robust, flexible, again, pretty cost effective. So when you do a slip, Lonnie, again, the recommendation is to have a grounded annulus for fully structural rehab solution. So

Stephen Boggess 

yeah, Don, so one of the components that we always talk about, and I guess the decision making process for folks out there is, is that grouting a lot of you have questions about the grounding process. What’s involved with that? What kind of grout should we use? But I think most importantly, it’s what’s going on with the host pipe and and the dynamic of the grout not only filling the annular space, but also if you’re using the correct formulation for grout, going outside that host pipe filling the voids and helping secure the structural component outside of the house pipe.

Don McGriff 

Yes, the status I mean, one of the biggest questions I get is, Do I really have to grout the interspace. And it’s recommendation we have and and the reason we do it is basically there’s there’s a number of benefits, you can stop the road in the backfield erosion that may be occurring and a lot of times the reason why people are addressing the culverts is they’ve seen some sort of evidence at the roadway or at the railroad or whatnot. So you’re going to address that void creating the material slotting way things of that nature, you’re going to basically secure the pipe and the and maintain the grade that that ladder is on when you when you add a grout and then you’re going to be able to eliminate those water pathways that may occur outside of the host pipe or within the annulus where the the brown water may want to bypass and create continue to create a channel. So if you grout typically something we promote a sailor grout and just because it’s lightweight, it gets to a lot of places it finds the voids and many of the ones that you don’t know that you have you know we’re really talking about what we think is a simplistic process for lining with polyethylene. The equipment to install the pipe, typically a track hoe backhoe something of that nature to get pipe put together and placed in and then you’re going to seal the the ends with with concrete which is something all DLTs are road departments are going to be familiar with. And then adding a route is typically involves a grout pump that’s either in house or easily, you know, can be attained. So when we talked about the specialized equipment and the specialized expertise that’s needed with some of the clothes fit liners. We like to think this as simplistic. Maybe Maybe we make the ground a little bit more simplistic than that it turns out to be for everyone. But it’s not a complex process, you’re just replacing the annular space giving it a material. That’s like Soul.

David Hundley 

All right. Well, let’s start off by talking about ash toe and specification. Stephen, can you jump in and give us a little background on sure this and why it’s important to this group? Sure.

Stephen Boggess 

So so the folks in the audience that are familiar with with dealing with transportation related construction, probably know of ash toe for those that don’t, American Association of State and Highway and Transportation Officials organization, nationally, that is made up of members of all the state do T’s as well as some other state and federal partners. But the reason this comes up is because a lot of times with what we’ve seen out in with our engineering and owner community, is they look to standards to give them guidance on how they should approach their cover rehab options, and a lot of folks start with ash toe M 326. So the M 326 specification addresses. It’s a culvert rehab specific application or standard that that includes the use of HDPE pipe for slip lining the culvert going through the grouting process that that Don explained. But it also identifies that it can be a fuse HDPE pipe or mechanically joined HDPE. Pipe. And, you know, to note that it is specific to the application of Culver rehab.

Don McGriff 

Saving a lot of people confuse em 326 With Ashtakam 294. Can you

Stephen Boggess 

Yeah, so that’s good point. And so you know, our world, our company, so industries, we deal with solid wall HDPE, pipe, fuse applications of pressure applications. And so the product lines that we deal with related to cover lining, obviously is not that it’s drainage. And we do have mechanically joined components. So when we stand in front of folks, we toggle HDPE pipe, their first point of reference is the ash toe M 294, which is the dual wall corrugated drainage pipe, direct bury. And to be clear, that’s not what we’re talking about here. So it’s a solid wall HDPE product that’s used in industrial applications. And it’s really robust, as Don said before, in being able to put it a pipe inside a pipe and all the nasty scenarios that you’re going to have with with rusted out inverts are turned up inverts or deflections, and this pipe is a very good product to push through those dynamics.

David Hundley 

See, we thank you for doing that. And I remember in 326 Dash await this has been out for a long time, it’s probably been revised a couple of I think the current

Stephen Boggess 

revision is such I think dash eight tank 80. Okay, so her rosin has been around a

David Hundley 

long time, but also states have adopted it for state DLT. Yeah,

Stephen Boggess 

like I said before, the nice thing about this is, you know, you’re gonna go through a decision making process, maybe a decision making tree. And so a lot of folks have found that this covers the largest and broadest scenarios that you’re going to see. And it covers the range of sizes for this are the solid wall sizes, which is basically up to 63 inches, and outside diameter. So it’s going to cover the most common culvert sizes out there. And one of the things for owners in dealing with their assets years and years down the road, is that they have consistency in the repairs they’re using for the next generation of engineers and owners are gonna have to deal with these things, the less different scenarios they have in their in their asset inventory, the better. So they can start with us use this as their starting point. And then if they have unique dynamics, then they go back to spot repairs, they do some things with here in place or folding form or where the spray liners if they need to do that. I’d

David Hundley 

like to take a little breather here. We’re right on time. I think we just got a few more, we can go back to Stephen real quick. On the camera. Our marketing team said the best shirt to wear with a blue background was a gray shirt. And Stephen did a great job. I appreciate you dyeing your beard just for today. Because we wanted to Yeah, we all gray and working really hard on that nice job. So yeah,

Stephen Boggess 

I’m glad you comb your hair. All right. Well, again, any

Don McGriff 

questions?

David Hundley 

Let us know we’ll be taking a poll here in just a couple of minutes but excited to jump to the next screen. Don, tell us a little bit about snap-tite.

Don McGriff 

So just clarifying what Stan says. So the M 294. It’s typically talking about an ATS indwell. And most people are familiar with that. And it does a good job from a direct very standpoint, but when we’re talking about the solid wall HTP as Stephen mentioned alluded to a few minutes ago. So normally a pressure rated pipe know something that’s capable of 60 psi until we machine the ends on it but we’re talking about a pipe that Roughly as half an inch for every 16 inches of diameter, so if you had a 32 inch, it’d be a one inch thick pipe 48 inches, an inch and a half thick of polyethylene. So again, really robust. And so it’s a structural pipe, it’s normally direct buried, we’re using it. But obviously with the smooth interior smooth next year has a lot of advantages for covert lining. But one of the biggest advantages we’d like to talk about it is a structural pipe. And so when you’re realigning an existing host, and you need some more for shoulder, or you need something for extra lanes, that’s an advantage that has over close fit liners where you’re relying on the existing host. And that’s all you’ve got, you can’t spray more on the outside, you can extend that shirt in place and bury it with reliability. This you can so if you need four to six feet on each side, you can use that that polyethylene, again, it’s a it’s a mechanical joint. So male female joint, a lot of people like to think about, we talked about specialized equipment and specialized techniques, and polyethylene can be heat fuse. But this pot because it’s mechanically joined, we’ve made it simplistic. And so you don’t need to have that. And when people compare slugline with polyethylene to other methods, they want to talk about fusion, and we’ve taken that dynamic or that that cost and that expertise out of it, we are typically talking about a pipe that ranges from eight to 63 inch on the on the outside diameter. And then you could back out again, using that ratio of wall thickness to diameter to get an ID. But that’s, that’s in some of our literature, pretty easy. We’re talking about a pipe that is 100 year service life. And that’s based upon stress regression curve for pressure pipe. This pipe has not been around 100 years, but it’s been around about 50 years, and doing rather rather well. But we’re talking about pressure grade resins, that’s another difference between it and and say a quarter corrugated polyethylene pipe, this is our grades or pressure grade resins. So they’re higher strength, higher risk resistance to cracks and things like that. So it gives you great corrosion, abrasion resistance resistance to things that come off the road things that that flow through a culvert. And then it’s a very smooth pipe, that point 009, for those of you without references, is very smooth. So when when people choose a close fit solution, and they choose it for hydraulics, they’re doing so because they think if I put this pipe in, that’s going to be two, three to six inches difference in ID, from what I’ve got, I’m here to tell you that the the HDPE, Snap-Tite will give you as good a flow through any CMP that we would normally line and through some of the same sizes of RCEP. Now you may take a step back, depending upon those combinations. But you know, when you’re talking about flow, you can get a lot through there. But David, I want to also focus on pipe capacity, you know, when we talk about the pipe, the pipe has a certain capacity, and then you figure out what that Manning’s in coefficient, but it’s not always just the about the pipe, sometimes it’s about how well the water gets in or how well the water gets out. And so we we have worked with and created a hydro Bell, which is connects to the snap type system. And this works when you get in control. And inlet control typically starts when you get a certain height of head water above the inlet. And therefore that water doesn’t get into the pipe. Well, and you can’t take advantage of all the pipe capacity. Conversely, you might have outlet control where you have tailwaters, and things that limit how well the water gets out. So while we talk about pod capacity, we realized that hydraulically, it’s not always about that. But that high hydro bill is basically a funnel. It’s a inlet enhancement device, it helps water get into the culvert so you can take advantage of the full range of the polio.

Stephen Boggess 

So basically, for those that that I speak with, on a simplistic term, it’s how, how fast the water gets through the pipe. And then when you’re under situation of head pressure, that the entrance becomes inefficient. You got air gaps, and so then how much water can we get into the pipe? Yes, simplistic.

Don McGriff 

It’s almost, I have to correct people to say how do I get more flow out of my pipe? And it’s not that you’re getting more flow out of your pipe. When you use a hydro bill, you’re taking advantage of the full capacity of the pipe by not letting it limit on on the inlet and, and to be quite honest, it’s the only system I know that’s doing covert lining that addresses inlet control.

David Hundley 

All right. Well, we have a quick question. It’s pertaining to 66 inch diameter, which is very timely. So we’re gonna move on to the next part of the presentation, and I’ll try to get this answer for for Bobby, but let’s let’s jump into Stephen we talked about Snap-Tite. You mentioned 63 inch on the end. And what’s it look like for CULVERT lining anything larger than that? 63 inch eau de which I believe will take care of 84 inch please correct me if I’m wrong?

Stephen Boggess 

Yeah, potentially from a flow capacity. standpoint as Don said, obviously that you have to look at that but the clarify the SGM 326 standard that we honed in on earlier that is really kind of a starting point that does go up to liners that max at 63 inches, which is the largest solid YTP size. This firelight product line is a profile wall pipe, it meets ASTM F 894. And this product line goes up to 120 inch ID. So again, let’s clarify most folks that deal with drainage pipes are dealing with Addy control pipes, you’ve got Astro hem 326, that that fits is kind of the standard, solid HDPE. That’s an outside diameter pipe. And now we transition to the larger pipe for going back to an ID control pipe. So it gets a little bit gets confusing. And that’s why you call us when you’re looking at this and make sure you’re on the right thing. But the spotlight product line, you know gets us almost almost all of the components that come along with the benefits of a slip line Astro and 326. Really the primary difference is the construction of the pipe which Donald speak to. And then the connection method very similar, but not exactly the same. So Don, I’ll let you take it from there.

Don McGriff 

Yeah, so if we’re going to image back on me here, I’ll show you basically a cutaway of a profile wall pipe. And what you’re gonna see is something that has a smooth interior, a core to it, and then an exterior. So the way this is made, the solid wall pipes typically extruded out it’s extruded as a solid piece of pipe, you know, with around wall that’s continuous. As it turns out, this is basically taking a pipe that’s manually wrapped. So you take this bottom layer, you wrap it around a mandrel and then you’re going to take this core tube and wrap it around the bottom layer, and that core tube is going to be sized and spaced based upon the amount of strength that you need. And then you finish it off with an outer layer that gives you basically that smooth exterior that you need. That helps with lining a typically a corrugated ID culvert so so here you get a smooth interior smooth exterior. And it’s something that’s really robust. And it’s typically connected with bell spigot so it doesn’t have the snap connection that that you normally have. It’s Bell and spigot we have ways to help hold that bell and spigot together. And we can engineer the wall to as thick and as to handle the depths that we need the structural loads that we need. And so it offers benefits not just for CULVERT lining but a few other applications too.

Stephen Boggess 

Yeah, so so the the spotlight product line, you know, we’re talking about the for use in culvert rehabilitation for this presentation, but it is a direct buried pipe that’s used in sanitary sewer, new construction real lines of sanitary sewer combined combined sewer systems as well as irrigation systems, retention, detention and retention systems, odor control, just to name a few as well as some some above ground industrial even even tanks, a manhole, construction, those are all components that that spire like can be used for. And then one of the things that coming back to relevance to the world of drainage and culverts is aquatic life passage and we have a couple of options with the spiral life product line as well as soluble HDPE for dealing with the aquatic life dynamic in drainage and complex.

Don McGriff 

Yeah, so So real quick, you know, this ALP pipe that we’ve developed is essentially the spiral light without that smooth and tear. So your hydraulics suffer, but you’re doing it to address the AOP or ecosystems that may need to cross from one side to the other. So typically, you’ll see a baffle systems allow sediment to build up in the corrugations. And then some other baffles that could create resting pools and things like that. And so you can use this for relining and use it for direct bury, but the harsh reality is is that there’s not enough funding replace every failing culvert with a bridge, which is what every environmentalist wants to do, and I get it, but there’s just not enough money out there. So with these failing culverts, we feel like we’re offering some sort of intermediate advantage maybe gives you another 20 3050 years of life and saves that funding for those that really need the bridge.

David Hundley 

All right, great job guys. So we set a lot 45 minutes in right now we’ve got a handful of questions. I’ll wait a few minutes to get to those. And, and I just I just wanted to say I appreciate you guys you know excellent information and you know, these insights, we are definitely our goal is to educate so trying to do our best so I appreciate you talking about the Snap-Tite because that’s what you guys your day job right, you’re very limited but we really appreciate what you guys bring to the table and as the host I’ll keep this thing moving because everybody’s got other things to do. So real quick. There’s some resources that are available just we have people can jot this down as we move along here. You’re speaker, I

Stephen Boggess 

just wanted to point out these two guides, the technical guide design manual, as a lot of good information. And it’s kind of the silver lining Bible. It’s really good for owners and engineers that are looking to design a project and everything they need with that. The installation Field Guide, is for installers, contractors, I did want to point out that we didn’t mention before that one of the huge benefits of mechanically joined HTP for COBRA lining, especially with snap tide, is that it can be installed by your own work crews. So if you’re a city, a county, a DOD, we have a lot of do T’s that by this pipe and install it with our own work crews. So it’s absolutely can be done this, this field guide helps guide folks through that process. And then obviously, local contractor contractors do this work all the time. So

David Hundley 

excellent. And yeah, just ISCO-pipe.com is a great place to go. For, you know, HDPE you could certainly go dig into field reports.

Stephen Boggess 

One thing real quick the webinars up there, David, go back there real quick. Yeah, they got to go make sure they get that we did do about a year and a half, two years ago, a presentation on the ash only on Astro in 326. If you have more interested in that, go to the ISCO-pipe.com web webinars. And you can find that as well as obviously our other insights presentations, you can log into that and have access to those presentations. All

David Hundley 

right, great job in it again. Great job presenting on all options because I’ve been out there. It’s been it’s been a while pro through a lot of culverts and the reality is culverts are a big problem. Right? The drainage culverts in the US some of the states have been very proactive addressing some have not every one

Stephen Boggess 

out there is getting worse every day. So So all of these options, all of these methods are things that people need to have

David Hundley 

as a tool holder every day. And you are absolutely getting older every day just like a Culvert They’re getting worse every

Stephen Boggess 

year. Yes. smarter, wiser.

David Hundley 

That’s right. All right. Well, again, as the host, I really do appreciate you guys coming here and giving us the education on on just culvert repair culvert lining and hopefully a lot of the audience got a lot out of this and they’ll be willing to join another future. Opportunity for ay ay, ay ISCO insights. So plugging this go real quick one slide on this, if you haven’t heard of us is, again, if this is your first time, I appreciate you guys joining if you’ve been here before, we certainly introduced this go in with him for 16 years really appreciate the effort and the focus on HDPE pipe, right. So these are locations around the US please give us call a project you have industrial wise, landfill wise. Today we’re talking about ziplining with solid wall but there’s lots of upcoming, you know, insights that the audience can jump on. And please connect with us. You know, we we definitely want you I noticed on the Twitter, there’s a little bird there. Isn’t that supposed to happen next? Yeah. Nice that so we got correct that for any future presentations, please connect with us. We’d love for you to connect, we try to do our best to again, educate on on those platforms. Hopefully you can get something in the future. That would be beneficial. And of course, some of you guys hopefully you guys came in for some CPUs today. We love doing this. That’s why we host this education, education education. It’s very difficult for all of our sales team to get out and do engineering presentations at every engineering facility. So we appreciate you being here. Please use the QR code. If you want to sign up for a fully accredited CEU we will get that back to you as soon as possible. Or again you go to the ISCO dash pipe.com backslash CEE by slash. Alright. Let’s see if maybe a couple of minutes have some questions. I’ve got some statements but but some some questions for sure. Rent wants to know, UK is playing Alabama and football this year. I’m assuming that Alabama’s gonna win that game and Stephen Baugus I

Don McGriff 

needed a couple more weeks to figure out how that’s gonna work out.

Stephen Boggess 

But last time we played in Lexington I

Don McGriff 

think we won are sure 2000

David Hundley 

All right. So Marissa had asked question earlier and as the host I wasn’t sure what I meant, but just you talked about inflow and infiltration. So I’m not sure if she’s specific to slip lining or other materials that are out there. But my answer I would say hopefully you can correct me is if routed properly there would not be any it as in between the host pipe for

Don McGriff 

for a flatline or definitely you know the ground. Well, it’s meant to serve as a soul. It can can’t help but the letter itself. Yeah, when it snapped together with the gasket connection, it’s not going to allow any infiltration exfiltration manifests, it’s going to need to seal because that needs to hold back the grout as, as it’s placed. So, so you’re typically not going to see any liquid coming into the interior, from from infiltration exfiltration. You know, that’s typically a term that’s used a lot with sewers, because of manholes and pipes that are that are leaking, or letting in and out. But when you’ve got a sealed system after rehab, it should not. And as compared to

Stephen Boggess 

some of the other liner products that we discussed,

Don McGriff 

I think most of if they’re doing well, there, you may see, like said, you see spray applied, sometimes you see that rust coming through seeping through. So that kind of gives you an indication that they’re not addressing it fully. If they’re not done, right anyway. But most of the time, you’re gonna see infiltration exfiltration go away, if it’s done problem with any of

Stephen Boggess 

these items, the key is correct installation, and correct steps being, I guess, specified to do the installation. Yeah,

Don McGriff 

yeah, there’s there’s going to be trade offs with every method. I mean, we mentioned closed systems being an advantageous for the CIP peas, you know, as a supplier, you’re typically talking about something needs at least 10 feet, sometimes 25 feet of room. And that’s not always available. We understand that. You know, so we’d like to say that, you know, and one reason why we talked about these, you need to have a number of tools in the toolbox.

David Hundley 

There was a question earlier, about large diameter, slip lining. And I recall, when slipping in large diameter or any any bigger pipe, we definitely want to lift using skids as the process of slipping the code. And we think we want the grout to go up under for sure the pipe we want good flow. And question was, how thick of a skin do we need? And I don’t remember that being anything specific to that.

Don McGriff 

There’s a couple of aspects to that question, David is, with a polyethylene, it typically slides very well. Now, you don’t want to take the chance of binding but you know, with with a snap time being that smooth exterior, and that joint having no protrusion, it slides without it. And then the depending upon how you need to invert, you may allow the grout to float the pipe. Most times you’re trying to keep the pipe low to match the Invert. So you’re trying to keep that as small as possible. But that route will typically find its way underneath the pipe. You don’t have to have skids to do that, with the spotlight the larger pipe because of the bell spigot, you might assist it a little bit more. But if this pipe slides rather well, at least the polyethylene was that

David Hundley 

question specific to larger dye it was it was definitely specific to larger dye. Okay, so

Stephen Boggess 

in that case, kids definitely are

Don McGriff 

Yeah, but they’ll definitely help the lathe may play a role as far as how comfortable you’re getting it to slide from one and it’s

Stephen Boggess 

hard, but two by fours, right. 1620 feet long, one by

Don McGriff 

one by fours. Well, listen,

David Hundley 

we got a lot of contractors out there that are qualified for sure to to do CULVERT line of uses Snap-Tite. And these guys have some great tricks and they utilize so we’d be glad to pass along any field,

Don McGriff 

we try not to limit their imagination. That’s right. All right. And

David Hundley 

then I think I know the answer to this one, how can ask how much distance upstream of the head wall do you need to mobilize for the slip blinding of Snap-Tite? And how much the stream would be impacted? That’s obviously the most important part of the question, how much are we impacting the stream upstream of that culvert?

Don McGriff 

Typically, you can have the the rehab liner pipe and the current one if you don’t need to extend for shoulder or things like that. So your bulkheads going to start at the at the end of the existing host is typically gonna go six to 18 inches in depending upon how long how much grinding force we’re expecting. And so your pipe can be right at the existing post. I think

Stephen Boggess 

I may have asked I think from a construction like Yeah, as far as

Don McGriff 

how much room Yeah, probably should have. Like said if we’re dealing with 24 foot joints, you’re probably going to need 25 to 30 feet. If we get into where we need shorter we can do typically a nine foot stick is kind of what we call our half links. So we can do less, the lead time might be a little bit longer on that versus the 24 footers. But you know, we’ll work with you. We probably should mention that myself and, and Ryan, who cover much of us for ISCO. And then we’ve got a number of reps. That’s what we do. We like to go out into the field we like to go Walker CULVERT Look at CULVERT with you and figure out is this a good fit for us? And if so one of the things we need to be concerned about. So give us an opportunity to come look at it with you. I offer some insight and maybe that works for you as far as figuring out if this was a good solution but Didn’t parlay

Stephen Boggess 

on that with our team. You know, those of us with this go this, this is what we deal with every day. So we do have some expertise. But we have we have this network of independent sales reps and distributors we work with nationwide that are your local contacts, they come out and do that. And then they as well as some of our contacts, from the, from the installation side of it, our contractor relationships, we can we can definitely connect you with folks that could help determine all the dynamics that would go into that particular construction site.

David Hundley 

All right, got a question for Mr. Song? And it’s probably a great question. I think this is one that I’m gonna let you guys reach out to him. There’s a lot to it. One of the things is deformation of the pipe itself. And I know we manufacture the oval pipe and things of that sort. I’m not 100% Sure, I get the question. But we’ll have one of you guys reach out to this. Okay,

Stephen Boggess 

I will take the opportunity we we didn’t talk about a pipe, we, you know, our pipe can be can be squashed and stranded. And that

David Hundley 

would certainly be if the host is is oval or or just a purely deflection state.

Stephen Boggess 

The other the other dynamic is with round pipes that have been deformed on the inside or have some sort of dynamic to be very difficult to navigate, or the flexible pipe that we have will get through the pipe. And we have a process called a nose cone or a bullet nose that can help navigate those undulations or those deflections to get the snap type three of that pie. And I just

David Hundley 

realized what is that? So he goes in and does a 3d impression of the culvert. And we see you know, we would use an 18 inch liner for H 24 inch pipe. I’m making numbers up. All right, but it’s dropped down paths that can we dig down to the next size available. I guess that would just be a legend. Yes,

Don McGriff 

certainly considering your hydraulics and and sometimes it may not be getting back to the original host, it may be just getting something that’s good enough to allow us to do a rehab without digging up a road. That’s very inconvenient. Well, I

Stephen Boggess 

can tell you, three of our most volume, size and sales wise are 1820 and 22. Because of 24 inch culverts, that’s what’s out there inside diameter 24 inch culverts are by far the most so so those are three sizes. So depending on the dynamics of the host, the hydraulic requirements, and any three of those can work.

David Hundley 

Alright, we’ve one more question. And again, thanks, everybody for for chiming in and asking questions. That’s certainly very helpful for for our team. But Keith says, can you talk a little bit more about the drought? And I know there’s lots of different recipes. I remember the describing as a melted milkshake, in some instances, depending on how much flow you need to get and how much void or you know, unknown void, obviously. But can you can you expand a little bit on yeah,

Don McGriff 

I’d certainly be happy to Keith, I’ll give you as much as I can. And kind of a short frame here. But I’ll go and mention that, you know, our design manual Technical Guide, has a long chapter about the grounding and grounding is something that people are curious about, like so we recommend a secular grout just because it’s easy, flexible, it tends to find spaces, it creates a lot less demand and then regular grounds. But you know, there’s a lot of people out there using global fields, slurry mixes, got to kind of be careful with that term, neat mixes, things that have low aggregate, typically, you’re just trying to get some sort of cement just product in there, that’s going to set up and give you more compressive strength and that even the soil had and that doesn’t take very much. Typically, that decision is going to be dependent upon the length of the culvert, how well it’s going to flow from one end to the other, and then sometimes the innerspace and again, low aggregate, something that doesn’t clog the tubes or, or you may drill a hole core hole an existing host and pour it in from the upstream end to downstream. So a lot of that’s addressed in our design guide and I think would be a great reference. And then we can follow up with additional questions from there reach out to us and let us know what we didn’t answer that.

David Hundley 

Absolutely, you know, it’s right at three o’clock Eastern time. Thank you guys very much. Thank you. For everyone who joined us this presentation as mentioned earlier on the webinar, ISCO-pipe.com/webinar will be available so feel free to use this for education for your teams. Feel free to reach out to us. We have a whole team of sales guys that are educated on culvert inspections and come out and take a look at at your need and and the condition of of the of the hose pipe. We will help you with any specifications going forward. So we are here to help I hope that everyone who attended today got the education on culvert repair. The need for culvert repair, replacement. There’s multiple We’ll ideas on some other other products that are available. We just picked a few and hopefully we were we had enough information to share with you guys on some other technologies. Snap-Tite is the one that we live and breathe every day in polyethylene and, and solid wall. Polyethylene. So thank you very much. Thanks for joining again my My name is David and I’m not sure they’ll allow me to come back for the next one. Because this is my first one but hopefully I did a good, good enough job to guide you guys through this presentation. Thanks and have a great rest of your day.