Still Wetting Out With A Linoleum Roller and No Vacuum Pump?

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Linoleum Calibration Roller

We just converted a customer from a tank style inversion unit to our Quik Shot(tm) because he had a 200′ installation of 8″ diameter pipe that wouldn’t fit in the tank. He said he had a “calibration roller and all the other stuff needed for wet out”. He’d also been lining for several years and wanted to pay for training on site. When we got on site, his calibration roller was an old linoleum roller and there was no vacuum pump in existence. As the job needed to be completed right then, we watched him go through his “normal” wet out. From the time he mixed, poured in 400#’s of resin and “rolled” it out, the time elapsed was 96 minutes. It was a cold night on the east coast and the resin wasn’t rolling our very easily. To add insult to injury, because it was so cold, the resin tended to stay thick in the lining material, and when nearing the end, found we were short about 50# of material needed to wet out a section of dry bag that he just couldn’t get. After mixing an additional batch, the bag was ready for installation.

Quik Shotâ„¢ Unit for inversions

While the liner got processed through the Quik Shot ™ at the gasket opening setting for the material, the extra resin worked its way to the tail of the bag and we filled over a bucket of excess resin. So what’s the lesson learned here?

We’re back to the ASTM F1216-16 installation standard calling for vacuum impregnation and calibrated thickness. If you are installing CIPP liners and telling your customers you are installing according the the standards set for the industry, then you really need to follow those standards. If you don’t you are opening yourself up to legal exposure if, for any reason, your project encounters a problem. If, for example, you have a section of liner that didn’t get any resin, and a root eventually grows through that part of the liner since there is not resin to hold it back, you will be the one paying for the repair. And while this scenario is remote, it could happen.

More importantly to you is the cost of “wet out”. First of all using a vacuum pump pulls air pockets out of the liner when resin replaces those air pockets giving you a fully saturated liner. By calibration to the design thickness allows you to use the correct amount of resin. With resin thicker, you are buying and using more resin than called for as a linoleum roller does not have a thickness setting, so the weight of the roller running back and forth across the bag is the only determinate of thickness. If the resin is thick as you find in winter months, you’ll need more and if you don’t control the resin temperature in the summer and wet out with warm resin, you’ll “wet out” too thin. Regardless, spending 96 minutes on the “wet out” process costs extra labor. With a calibration roller and vacuum pump, the “wet out” should have taken between 25 and 30 minutes for this 200′ liner. Of course if labor costs are of no importance, give your guys the right tools and a raise and let them earn the money without the panic of trying to get the resin in the liner so you can get it in the ground before it kicks off. The time and extra resin savings would have made a great payment on a calibration roller and vacuum pump. In his defense, his original supplier was heavy on sales and light on training and support.

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