One & Done? Coating With One Pass & Structurally Sound?

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Not So Fast

” I was told at the WWETT Show that a competitive process to your coating system could apply a single layer of resin to a pipe and it would be a stand alone structural liner. With your system, you need to build up layers to get to a design thickness to rebuild pipe to structural. Direction changes as well as diameter changes with a mechanical pulling device can maintain a constant thickness whereas your system has to have brush size changes for diameter changes. Granted, the system I looked at is more money, but it would appear that if all I have to do is push the device down the line, push a button and when the retriever winds the cable back in, I’m done.”

I don’t know what type of resin your competitive process is using nor what the physical properties of the resin are. You can easily review the technical data sheets of the resin to see its physical properties. Additionally, I’ve proposed a standard for design of coating to pipe to the IAPMO organization who control the items in the Uniform Plumbing Code. As of today there is no “standard” for this process. I’ve heard some vendors try to piggy back on the ASTM for CIPP – ASTM F-1216, but this process doesn’t fit into that standard. First of all, ASTM F-1216 and ASTM D5813 prescribes 3 resins and include polyester resin, vinyl ester resin, a hybrid of polyester and epoxy, and epoxy resin. There is only one coating system that uses epoxy and as far as I know, they don’t relate it to ASTM F-1216.

Perhaps someone has found a way to control the volume of spray when changing diameters so it slows down when going from bigger pipe to smaller pipe. That would take some pretty high tech computer equipment, but I’m sure it’s doable. An even more difficult process would be to slow the flow on the inside of a turn while increasing the flow to the outside of the turn to maintain a constant thickness on the turns. If the producer can do those things, I’m sure he can explain how it’s done.

From my own personal experience in developing the Quik Coating process applying too much resin at the viscosities that can be pumped with conventional pumps will let the resin run as you would experience with over spraying or loading a paint brush too heavily. Have you ever watch a painter paint a car? He doesn’t spray too long in one place as he knows his paint will run. It’s doubtful that any spray of resin in the viscosity ranges we use could be applied thick enough for a single coat application.

Quik Coating Machine

So, the material data sheets your supplier has regarding his resin system. If he is applying a coating to a fully structural stand alone condition he should be able to show testing data demonstrating that. I can’t make any claims yet as the standard hasn’t been fully developed, nor approval by any agency, and is in the process. We all can guess and I can guess what the thickness for a structural fix for my material is, but until I have the documentation from testing it, I’ll reserve sales claims.

In drafting standards, we’ve discussed the following testing methods to be used for any material used in the coating process. The following ASTM’s are being considered: ASTM D543, D638, D790, D903, D3567, D3839, D5813, E797 & F412. We meet in March to refine the standards for the full committee review. I will keep you posted.

In the meantime, watch our next demonstration at the PHCC show in Long Beach, CA this coming Saturday, 3/3/2018 at the convention center. 

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