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today we're gonna go through some hvac systems we're gonna give you a nice introduction and then we'll tell you about belzona solutions for condensers cooling water towers chillers and air handling systems and then we'll go right into our question and answer section my name is arya chambers i'm the marketing specialist for banks industrial group i'll be your moderator for today and with me i have aj patel who's our business development manager and mark borsky who's our technical manager with that i'm going to pass it over to aj get us started awesome well thank you so much arya and good afternoon to everybody i hope everybody is doing well uh it's kind of ironic we're going to talk about heating ventilation and air conditioning and this is going to happen on what is a very very cold thursday afternoon so i think it dipped below freezing last night and but it's supposed to warm up uh so it's actually why it is a great time of year to have this conversation because when things get cold um it's an opportunity to help us repair our air conditioning system so hvac heating ventilation and air conditioning so um you know as already mentioned we're going to go over a few components and i wanted to just take a moment give you a very big macro overview of what it is that we're going to be discussing today some of the elements we're going to dive into so first how does an hvac system work and again this is going to be very high level uh as you'll see later in the presentation we'll get a little bit more detailed but i don't want to kind of scum up the message here so first we have an air handling system so basically uh this is the system that pulls in the air from your building which is meant to keep your employees comfortable or maybe whatever equipment you have at a proper temperature after all this is what it services so the air handling unit is going to pull air from there it's gonna go over these exchanger um coils right here and it's going to cool it down in the case of an air conditioner um and this fan here will then blow it back into the um into the building actually it goes reverse it gets sucked in by the fan blown across the coil then out to the building excuse me and that is basically what happened so the question is how do these coils uh get cool well it's because of a chilled water system and what happens is this chilled water system has cold water that crosses against a uh a refrigerant it sucks the heat out it cools down that refrigerant and it sends it to these coils which then makes the air cold so then the question is well what happens to the water how does that chill the refrigerant well that is part of a condenser water system also known as a cooling tower you often see these on the top of buildings but basically it takes the children the the water and it basically sucks all the heat out of it through these big powerful fans uh you'll often see this if you're driving through a city um you'll see buildings will have what looks like plumes of steam coming out and actually what they are is the condenser water systems or the cooling tower systems so this system actually can also be used to heat a building uh instead of having the condenser water system in the chilled water system you'd simply take those out and replace it with a boiler system that would create steam and essentially that would lead to the heating of these coils and that is how you make a healing system so why do we care about erosion and corrosion in hvac systems why is this important well first of all again as i mentioned earlier the point of these systems is to keep you know the buildings that you're working in comfortable you want to be able to utilize them you want your employees that go there to be able to be comfortable while they're there and it creates a good work environment but what happens is if you don't properly maintain them and if you don't stay ahead of them you can run into some problems so one of them is reduced operating efficiency as these units are used over and over again obviously you have elements like water and metal involved guess what that's going to create a corrosive environment and so as the equipment starts to grade it has to run longer so your efficiencies start going away because your heat exchanges aren't as good and because of that you then have to run the equipment longer which means your operating costs are going to go up but also what happens is because you're running it longer you're actually going to shorten the equipment life because the actual run time is going to extend longer than it needs to and therefore you're going to bring it in bring in its total lifespan potentially by years and ultimately this equipment is very expensive to replace you know hvac systems are not the thermostat on the wall that's an easy thing to replace they're very large pieces of equipment often found in the core of a building or at the top of the building or below the building never in a convenient place where you could simply go in pop out old units put in new units there's usually a decent amount of logistics that's going to be involved potentially cranes potentially opening up sides of buildings so your goal when it comes to your hvac system is to stay ahead of it in maintenance and make sure that you prolong its life as long as you can so what are some of the common issues that we can see so we're cooling water towers again i mentioned you have a lot of water and that water is moved around in pipes and those pipes are metal so you put you you often see issues with some of the pipe work associated with it you might have leaks and once those leaks start happening again you're pulling away your coal your big element that you're moving around which is the water you're reducing the efficiency and again costs go up also water just spraying around is a problem in general you don't really want to have that in your buildings cooling tower basins so what happens is that the water goes in heat is extracted up water falls to the bottom again you have a galvan you might have metal it might be galvanic but again over time this starts to wear away you start seeing corrosion and once that corrosion happens you can potentially have leaks um so zooming in and looking in closer when we talked about the fans themselves they're massive fans that rotate and what they do is they suck air out and that what they're sucking out is the heat and the energy but what comes along with that you're gonna get small droplets of water so you're gonna drop it to water drop with uh you're getting a small debris you know all kinds of things that are going to flow through there you might have some of the the metal that's corroded away and as the leading edge of that fan blade is moving forward what's going to happen as you can see here is it starts getting busted up because it's constantly having these collisions as it's rotating around and around and around and so a few things happen one the ability for that blade to move through the air smoothly and lift out the heat that becomes less efficient because it's curve its shape is going away and so when that happens the motor itself has to run harder you're going to use more energy you're going to use more electricity but in addition to that it can lead to earlier failure because guess what you're breaking the leading edge apart and eventually it's going to work its way through the fan blade and you're going to end up having a bigger failure so that's one area that we see huge opportunities to potentially get ahead of problems i mentioned earlier we're moving a lot of water well when you want to move a liquid what do you use you use a pump and so oftentimes what happens is these units start working harder and harder over time they may be pushed to capacity you might start seeing vibrations happen within the pumps themselves when pumps start to vibrate unfortunately their ship their shafts tend to get scored they tend to get beaten up what happens then is is that water starts leaking out or some kind of fluid starts leaking out and you can have potential problems there and you lose efficiency ultimately you lose the lifetime of your equipment and then money chiller systems as we look closer there um they're generally made of like a copper alloy on the top tube side uh carbon steel on this on the tube sheet side um what we call the tube sheet is basically uh this area here so you can see kind of the silver metal that's the carbon steel and then all these round tubes those are generally made of copper uh it's also important to note that they they're not welded in uh what they do is they put the tube in and then they put some equipment in there and they actually just squeeze it out so we call that rolling we roll the tubes in and so what happens over time is you get a corrosion effect where um because you have two dissimilar metals um you're going to get some kind of galvanic you're going to get a corrosion is actually a chemical reaction so that reaction happens across two dissimilar metals when there's water present and you start eating away at the tube sheet and guess what happens water starts passing through this area because now you're past the area that you would have rolled right so now you got water passing through now you've lost efficiency in your heat exchange now your equipment has to run longer and again it's the same line we're all headed towards one thing which is you're going to have to replace your equipment earlier and that could be a huge cost finally when we get to air handling units we're talking about duct work we're talking about failures on the insulation itself underneath the insulation you can see lots of corrosion joints are another area and and the fact of the matter is is that there are a lot of wonderful solutions here too in fact one solution that we have in mind is going to be the topic of another webinar that we're going to do early in 2021 i'll give you a little hint it's called technodoc and that is an encapsulating system that will absolutely change uh the way that you look at ductwork and its needed maintenance and actually the energy efficiencies within your building so if you have questions if you have duct issues today if this is something that is of concern to you uh you can reach out to myself or mark our emails are at the bottom go ahead and write them down and we'll be more than happy to talk to you about it but until then we'll be uh we'll be doing a webinar in the next year so with that said i'm going to turn it over to my partner here mark borski um he is our technical manager here at belzona repair technology and banks industrial group he'll be able to go into detail around the various uh projects that we've done over time he'll be able to talk to you a little bit about some of the challenges that he's faced and dive a little bit more into uh some of the some of the ways that we we corrected some of these issues so mark let me go ahead and pass it on to you take it away my friend microphone on thanks aj uh let me pop my my side of the presentation on here and we'll get going all right thanks aj and thank you everybody for being here um today so when i first started getting ready for this uh this the webinar the first webinar that we did which was back in march that was our first covid error webinar um i never really thought that we'd be here mid-november um still doing webinars under the same under the same uh pandemic situation that we're in so i really appreciate you guys being here um and i hope we can and give you guys some really good information so all right when i started first looking at um compiling some case histories for for this webinar i kind of was i thought it would be an easy task because this you know hvac systems you know as aj just went through them they're they're pretty straightforward there's just a few major pieces of equipment that come together um but when you start to really dive down to all the little bits and pieces and you know the different problems you have there's really a lot uh a lot of stuff that that needs to be maintained needs to be repaired it needs to be protected which is the belzona's you know basically the bells of the slogan so um i'm gonna run through more of the application side i'm going to cover some of the stuff aj already covered um but i'm going to try and stay out of the the technical workings of the hvac system so let's start with this this is a pretty cool picture this is actually in philadelphia um just wanted to highlight this this is a job that we did here we worked on these cooling towers uh that are at basically the top of a skyscraper here in philly um it's a pretty neat job and i actually have some pictures of the interior of those those colon towers later on so starting with cool towers it just seems like a logical place to start um cooling towers can be on top of roofs a lot of times they're on top of roofs just to save real estate they can be on the ground they could be in a parking lot they could be next to the building um but really in in large commercial buildings they're going to be up on top of the roof so aj highlighted the number one problem that we see in cooling towers they're they're fairly simple pieces of equipment and that they're just basically a big box made out of sheet metal with fans in the top and then some piping that runs water through top and drops it down but in the bottom is a pan full of water and like i said it's it's it's just it's just uh galvanized sheet metal so the galvanizing holds up for a while but eventually the water finds its way in and starts to destroy the sheet metal it doesn't take long for you to get deep pits that become holes in the sheet metal and the biggest problem obviously is is leakage you're losing water that you then have to put back in you've got water all over your roof um in the winter you've got puddles that become ice and eventually it gets bad enough that you actually can't run your equipment because you can't move enough water through through the tower here's some and i'm gonna say these are typical examples of what we find um towers don't get the biggest maintenance budget um they're really seen as a as a cost until something goes wrong and they tend to be really neglected so by the time we're called in it's usually at the point where the owners is looking at do i replace my tower or do i fix my tower and replacing them can be a monumental task i mean as aj said you've got to get cranes up on the roof you know you've got not just the tower itself but the piping associated with it so a good alternative to replacing a coin tower is is to repair it and to coat it um which is what we do here at belzona so here's an example of what a cooling tower looks like inside this is actually the cooling tower that we looked at in the first picture um as you can see it's it's just a large metal box those those those square areas are where the fans would go and it's been cleaned up um it had a failed coating on it it was beginning to corrode there were a lot of holes in it and we went in and the first thing that we do is we abrasive blast and we clean off all the junk then we need to patch all the holes we use a belzona composite material um to patch those holes then once the hole has been patched and we need to seal the seams because the seams are really just once again it's just sheet metal that has just been bolted together with with with tech screws or bolts and then we come in and we and we code it we want to coat it with something that's going to last so we use belzona 5811 which is a two-part immersion grade epoxy so by emerging grade i mean this is designed to be under water or under a liquid for its entire life and lifespan is you know 10 or 20 years even so this is this is a robust system and this is going to make this tower last for a really long time here's a couple more examples this is a different tower just kind of a different configuration this is kind of a good picture as you can see here um you can see that laser pointer for you guys um up in this area you can see the fan that would be above you that's pulling the air and pulling the air up through the water cooling it here's an example of seams being sealed with elastomer here's another configuration it's a different different st le tower than the other two like i said they come in a lot of different shapes and sizes but they all basically do the same thing next area concern that i want to talk about is the piping associated with the tower so um these towers are almost always outside and so initially they're subject to regular weather conditions and of course piping that's outside that paint has a has a lifespan and in addition to that that that mist that was coming off the tower that aj was talking about so you're you're you're you're pulling water droplets up through and you'll see that plume of mist that gets up here in the air picks up all your pollutants and comes down to lays in these pipes these pipes are constantly in a wet environment but not just a wet of iron but a wet acidic environment because they're if you've ever heard of acid rain they're pulling all that junk out of the air and it isn't long before the tops of those pipes starts to paint starts to go and then the pipes start to corrode and start to look like that once again usually a very neglected uh portion of a facility um and you only have so much money to go around and we usually only get to these when they get to be really bad so this is an example of a cooling tower at a major university here in new jersey that supplied the air conditioning to the dean's office so this was a high priority for them to fix um make sure he had his air conditioning i'll show you the next picture a couple different things so if the pipes are in good enough condition and there's still there's still sound we can go ahead and remove all that rust and corrosion remove any failed coatings and then install a good quality coating like a 5811 or one of our other two-part epoxy systems that is going to protect this pipe in the long term because once again you got to look at this as a marine environment this isn't just a normal pipe that's running down the side of the road this is constantly seeing uh that mist sometimes this pipe is so corroded away that it's not able to do its job anymore and you're at risk of it of it holding out so one option is to cut it out and replace it but that's not always feasible in this case they couldn't shut this down and replace that pipe and there's a big cost to that so this is an example of our carbon fiber super wrap material that we use it's an asme approved material we use it not just in facilities but we use it in industrial locations on washer oil rigs in nuclear power plants and this is as good as replacing the pipe this is a 20-year repair that can be done without having to shut this line down you're going to see a lot of that in this presentation because it's very useful in hvhc here's another example this one is a pipe that actually leaked and we had to stop that leak because they couldn't turn this off and install the uh the repair to it and then the pipe that was good of course we coded that to protect that this is a riser this is an industrial facility but you could have these at a larger facility if you had if you had your cooling towers outside you always have a riser though this is bringing the water to the top of the tower and this is this is the warmer water that's coming back in the system so it's very very susceptible to corrosion so piping and cooling towers is not always made of carbon steel sometimes it's made of fiberglass well obviously fiberglass isn't going to rust but fiberglass has its own issues so when fiberglass starts to get older and the paint that was first applied to it starts to wear away fibers in the fiberglass begin to be exposed to uv and the uv will break down that fiberglass and it will embrittle it and eventually those fiberglass pipes will crack and break and and fail and have to be replaced very simple to keep them up and running and that's just to give them a good coating so this is an example of a belzona material this is belzona 511 which is a urethanous it's a uv stable urethane that will protect these pipes for for for 10 plus years um without without having any risk that the fibroblast is going to degrade all right so while we're basically back up on the roof i want to move over the air handlers and aj talked about how the ant highlighters worked and um talked a little bit about duct work related to it what i want to focus on is this area here as you can see there's a fan there so that fan is driven by an electric motor and um oh just real quick here's a couple examples of uh cooling towers because they come in different shapes and sizes so and this if your stairs don't look like this call banks industrial they'll help you out um so inside the air handler here's an example of that the shaft that connects the motor to the fan and here's that scroll cage motor that we saw on the other one so these are up on the roof nobody's checking on these every hour probably not every day probably every week and these these bearings have a tendency to seize up and when they seize up that fan it just keeps spinning and spinning and spinning and spinning and spinning until somebody hears a vibration or a noise or happens to check on it and then this is what you found it doesn't take very long to wear the shaft down like that now one option obviously is to replace the shaft but that's not the easiest job in the world these shafts are are are stuck in here and sometimes need to be cut out in pieces um so it's a very difficult and time-consuming operation so belzona has a very tried-and-true proven method for repairing these shafts in place without taking the equipment apart all you have to do is remove the bearing and we go in and we create a former this former can be made out of metal or we now have the ability to 3d print these and have them just shipped right to you or we can come out and do the application if you need but it's a very very simple application this former gets a release agent on it which is basically a wax so that the belzona won't stick to it then the shaft area that was worn we abrade this area in here and then we put the clamshell former on top we put it together and we let it cure so basically anybody that's ever played with plato when they were a kid can make this repair so once the belzona is cured which only takes a couple hours we break this this clamp off and we are left with a brand new shaft area that we could slide our bearing onto go right back in service all right so now we're done the roof let's move down to the mechanical room so i've been in lots and lots and lots and lots of mechanical rooms sometimes they're up in the penthouse of a building a lot of times they're in the basement and they are not normally like this i've been in a few that are like this that are pristine where you can eat at the floor and i've been a lot they were super dingy dirty and scary and some old buildings and most of them are in between but they all have one common thing in place they're they're full of equipment they've got pumps they've got chillers they've got uh boilers and they've got valves they've got piping everywhere and they're usually very hot and very humid and moist and dirty which is kind of odd thinking that your air conditioning unit is in a place where it stays hot and that's because they're this machine's job is to make cold air so you it's conserving all the coldness you can but it's giving off heat like the back of your refrigerator gives off heat if you ever notice your refrigerator is hot on the back well this room is hot because of that so talk about the chillers the chillers are this is the heart of the system i don't want to get too far into the details of how they work because we don't really have time for that today but just suffice it to say it's made up of two uh two heat exchangers a condenser and an evaporator and they they mostly do the same thing one takes the tower water uh out of the tower another one takes the water from the condenser and runs it through the evaporator and runs coolant through that um and there's a lot of things going on here so we've got the same kind of thing where we have water flowing through the tube sheets this is an example of a tube sheet and aj talked about this before you can see here this is what it looks like this is before it was sandblasted this was all the corrosion that's just loose corrosion on there you take it off you don't have a lot left and once you lose this seal you have a problem so you can use belzona we can go ahead and make a repair to that here's another good example of that heat exchangers aren't always round this is a square one and this is actually a side-by-side they're both next to each other but once again you can see how badly that was corroded i mean that was just you know on top of this corrosion causing that this comes off and gets inside the tubes and clogs the tubes and so you lose you know think about clogged arteries and you lose all the efficiency in there and every year somebody's going to come in and clean them and all this junk comes out and you start losing tubes so this is this is what it looks like after it's coated give some more examples some more examples just of general is you know corroded coded so this is a neat one this is actually at a big university in pennsylvania that has lots and lots and lots of these um and this is a very large heat exchanger actually only goes through one side but this was this is when back we coded it back in 2005. and here we have it opened up back here in in 2018. um it's dirty but the coating is still intact i'm still doing its job they open this every single year and check it as you can see they have lost some tubes the tubes start to degrade just on their own but those are those plugs are where the tube's been plugged all right so talk about bell ends so on this last city exchanger this had a flat door sheet not a bell end but most other heat exchangers the round ones are gonna have this bellen and on one side you're gonna have a division plate the other side you're not and you're gonna have an inlet and an outlet so where the water comes in the water goes out um have to be separated by what they call division plate so here's an example of what they look like coated but this is an example of a division plate so this is sealed this should be sealed to your tube sheet if you go back and you look at your pictures of your tube sheets you'll see um that was a good example but you'll see that there's a place where division plate meets debt so water comes in the inlet and goes out the inlet outlet and it's supposed to go through the tubes before it goes out the outlet well in this case it goes right here and it goes right there so the water some of your water never goes to your tube so some of your water never goes gets cooled so in that case you're losing tremendous efficiency so these are these are sometimes difficult to replace in this case this is this is obviously an older model um you may not have the casting email it may take it may take months to get one of these to fabricate it for you so we can go in with belzona we can actually restore those those division plates and and make it actually better than brand new because the belzona will never corrode so on this example of another issue that we we see a lot and that's the sealing surfaces the gasket surface you get what's called corrosion creeper where the corrosion slides in here and eventually your gasket won't seal and you need to maintain pressure in these in these you know it's not just leaking a little bit of leaking on the floor you need to maintain pressure or else you can't run the machines so it's another example here this was this was not an issue you see this is a really neat application in that this this was this was repaired in less than four hours this this uh this was a uh a flange at an oil refinery that was actually had water in it and um it was leaking and they they used a special forming method to replace it um pretty neat application so all right now i want to talk about the chilled water side but i don't want to get into the the workings of the machine just suffice it to say that in the kenser side is where your tower water comes in and this is generally warmer and over here you're starting to make cold cold refrigerant and then cold water and measure cold air this side these components over here they're cold and they're insulated so this is example of an evaporator so this this side here you see this is black insulation this is like a foam insulation that's glued on and and this is also the elbow here so i'm gonna talk about these a little bit we've got going on here we've got cold steel once again remember we're in a hot humid environment in that boiler room and you get moisture under here and you can't see it and over time corrosion starts to happen there and nobody knows it's happening until your machine's not working right and all of a sudden you have a leak and then you start talking your insulation off and it looks like that and you can see here this this came up because this this area here there was a leak that they had to had to locate the leak because they were losing refrigerant and they were you know the machine wasn't working properly so um it wasn't really feasible to replace this machine at the time it was not in a place that they could really get to uh that wasn't in their budget to replace it um so we came in and used once again the belzona carbon fiber and we carbon fiber the bottom of it this is the only problem the area that they felt like they had a problem so we went into that and then subsequently it was re-insulated and that's been in service i was actually in that building that's a that's a another school uh down here in uh in southern new jersey and i was in that building uh just the other week and it's been a couple years since we've done that and it's working just fine um this area here is adjacent to that that's that's this is going between the evaporator and the compressor and once again this is this is colder and it's also insulated and once again a leak there was a leak somewhere they they were losing refrigerant they didn't know where so they started ripping insulation off and until they could find that leak or in this case leaks and a lot of times it's in this area here where it's welded for some reason so um in this case what we did is we removed all the corrosion and scale and then we used a belzona putty an epoxy putty to seal any leaks to fill any pitting any areas of concern and um before we wrapped in this is also interesting to note this is this this this compressor the machinery that's on either side of this pipe is very delicate machinery and you can't get any debris in there so to take this off and replace it not only is it you know you're getting come alongs and chain falls and and you know getting getting in and out and the new one on you've got to worry about getting debris inside the inner mechanics of your machine which you don't want to do think about taking a cylinder head off an engine and getting something in your in one of your cylinders you don't want to do that so here's an example of it done this is what it looks like after it's finished and this is this is a permanent repair you'll never have to worry about this again um over here is an example of of it in progress this is a consolidation film this this we use this to squeeze out all the excess air and excess resin out of our repair so this ends up being a real solid uh permanent repair all right some machines have this and sometimes it's called economizer this is it also sucks part of the same system um it's in between if you use it it's in between the evaporator and condenser and it it kind of pre-cools the coolant before it goes in if you think like a pre-heater for for a boiler system or whatnot um and these are these are made of very thin gauge metal they don't see a lot of pressure they see maybe a pound or two of vacuum so they made a they're made of real thin metal and once again this is what you get when you take that insulation off and then you go through and you'll find little pin holes and that's where you're losing your refrigerant you're constantly losing refrigerant and and it makes the machine extremely inefficient and and to the point where it doesn't work anymore so we remove all the corrosion and then we go and use that ame paste and we go ahead in any areas where they're either we've identified holes or they're suspect especially around the welds we go ahead and fill that in and then we then we install a wrap system in this case we use a uh a fiberglass system that with a belzona resin and we use a uh a belzona coating material called 5892 um and we co we put it as a primer code put the fiberglass on and put a secondary code and once again problem solved all right so not everything in not everything in the in the in the mechanical room boiler room is cold so um buildings have to have heat too and the heat is generally some sort of steam and in this case you have things that are associated with that seam that have the same kind of cui problems corrosion problems this is an application that we highlighted before also one of our webinars um but we'd like to come back to because this this was in the in the sub-basement of a historic church and this this couldn't be taken out it's a condensate pot this is where the condensate water comes back and sits and just sludge and rust just eventually ate the bottomless out their only other option was to cut this in pieces and remove it and then bring a new tank in in pieces and weld it in place which wasn't a good option for them so in this case this had no access we had we had to cut this access door in it and we found everything short of a dead body in here it was there was a lot in there cleaned it all out we used in this case we used our wrap system internally to line this to make a new floor for it and then we coated the interior of it then we put the the opening back on and to avoid welding we went ahead and just used the same carbon fiber system to put that patch back on and that's up and running another condensate tank another example of cui didn't you as you can see here this metal jacketing from the outside no problem all of a sudden stuff's come out the bottom you take your insulation off not good once again simple solution for us all right so this is the last thing i want to highlight today this is kind of a neat application i've only actually done this once um this is a uh this is the head of the bell end of an exchanger that was actually outside and this had water in it and in the winter they're supposed to drain the water out but they didn't so what happened was this froze and cracked and they went to order a new head and this they didn't realize it had cracked until summertime when they went to turn their air conditioning on and lo and behold no air conditioning so they went out they found the crack ordered a new head it was going to be six to eight weeks so they couldn't wait six to eight weeks for their for their air conditioning so we we patched all this up grounded down and basically built a brand new head internally for this head and then we coated it with belzona 1341 which is our ceramic coating and they went ahead and installed that and a funny story about this is that they installed this got the air conditioning up and worked working and it was supposed to be a temporary repair their new head showed up and they basically sent it back because this one was working fine and they didn't want to pay for the new head um basically that concludes my portion here so just in summary our hvac systems are not just here to make us comfortable they're here um to make the interiors buildings you know you think about hospitals schools factories um warehouses places that need to stay cool so these are critical pieces of equipment that we need to maintain um and if we maintain them and if we if we if we treat them properly we can make them last for years and years and years so with that i'm gonna go hand it back to arya who's gonna do our q a all right thank you so much aj and mark for a great presentation to get us started in q a um aj we do have a question that asks what is the best time of year to start inspecting your chiller systems so i think i think i touched on that earlier uh but such a such a good question generally speaking once the weather starts turning you're not going to see as much load on your chiller system because it's already kind of cold outside so that's when we generally see people saying hey why don't you come out and take a look at our chiller system so i'd say now now is good but um generally speaking whenever you have large mechanical equipment it is always good to be looking at it monitoring it and watching it but if you have this equipment and you're you're concerned um we we're more than happy to come out uh you can reach out to mark mark or i uh our emails are on the bottom here and we will be more than happy to look at whatever uh whatever system you have and help you figure out how to make it last longer i'd like to just tag something on to the end of that um kind of expand on that there's one thing you should always be inspecting your equipment obviously um but these are especially here in the northeast these these the air fishing units come down in the fall and they go back up in the spring um so what i like to address is the best time to make the repairs is in the fall and the winter because what tends to happen is we tend to get a lot of calls for people that want to do work to their hv systems as we're getting into into the middle of spring and it's starting to get warm and there's there's a lot of demand right then so you know and you're also up against a deadline to get that up and running so if you can get if you can get it done the earlier the better um you'll you'll be ahead of the game you won't be fighting um everybody for scheduling um there's only there's so much work that we can do the time of year great point thank you both for your answer and then we have one more question that came through regarding a cooling tower that has multiple up well not multiple levels my cooling tower is located at ground level with some underground piping could you suggest maintenance tips for this situation mark you want to take that yeah sure that's a great that's a great question um so we we talked a lot about corn powers in different places sometimes cooling towers are located on the ground and they may be across a parking lot and the piping may may go underground under the parking lot and come up in the building somewhere um and that piping is is also susceptible to corrosion primarily in what we call the the soil to air interface which is usually about the first two to three feet of the of the buried piping um that's something you should inspect um because it um has a tendency to corrode there and you can't see it because it's underground and if you get to it early enough it's a simple process just like we showed before um to go ahead and either apply a good quality immersion grade coating to that piping if if if we get to it early enough or if it's if it's too far gone you can always use the wrap system but um that's something we see quite often this is our last webinar for the year we will see you in 2020 21 and thank you for joining have a happy thanksgiving and stay safe happy thanksgiving everybody you