Award Bid - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer, LLC

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to jump up and down. Securing the hose will prevent excessive movement and spills. The transfer hose itself is typically 1.5-2.0 inches diameter chemical hose suited for service with styrene monomer and intermittent contact with solvents such as acetone. APPLICATION OF VACUUM The first step to a successful wet out is to obtain a good vacuum on the tube. The purpose of the vacuum is to remove all the air from the tube and displace it with resin. As the tube moves past the pinch rollers, resin is forced back into the area of the tube evacuated by the vacuum. 1. Vacuum Equipment -- Although there are several means to achieve good vacuum on the tube, placing vacuum sources and sealing around the vacuum sources in the end of the tube is recommended. Also, placement of a vacuum hose to attach to the resin transfer pipe is necessary. Note: It is highly recommended to have a backup vacuum pump in the event of failure of the primary vacuum pump. Tube Preparation -- Start preparing the tube by sealing the tail end (last part to be wet out) of the tube. Although several methods can be used, sealing the end with duct tape has been found to be quite simple and effective. At the front end of the tube, where the wet out will start, this end will be sealed around the resin transfer hose with the soft end and/or duct tape. In addition, the tube should be sharply kinked or folded back 180 degrees on itself just beyond the end of the resin transfer hose. Kinking the tube will stop the resin from freely flowing into the tube until the vacuum fully saturates the entire cross sectional area of the tube in the area of the fold. PREPARE RESIN FOR WET OUT Once the tube has been prepared as described previously, catalyze and mix the resin as outlined in the Mixing Procedures. START UP/INITIAL TUBE FILLING When the vacuum has been applied and the tube has been prepared as