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Opening of Bids - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer
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Opening of Bids - 2024 Sewer and Manhole Rehabilitation Proj No. 122-019 - Visu-Sewer
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7/9/2024 2:49:57 PM
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7/9/2024 2:48:50 PM
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Board of Public Works
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Projects
Document Date
7/9/2024
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RECOMMENDED WET OUT PROCEDURE <br /> <br />SAFETY CONSIDERATIONS <br /> <br />The wet out process involves a number of different tasks that have their own <br />safety concerns. For the catalyzation, mixing and transferring of resins, refer to <br />the " Mixing Procedures" for the recommended safety considerations involved <br />with handling and exposure to the resins and catalyst chemicals. <br /> <br />The process of wetting out the tube may have the following safety concerns: <br /> <br />• When a moving conveyer belt is being used for the wet out, it is <br />recommended that personnel move onto and off the belt when it is <br />stationary. <br /> <br />• All moving conveyers should have a shut down cable that extends <br />the length of the belt and is easily accessible. <br /> <br />• When moving the tubes onto or off the conveyer, take proper <br />precautions for lifting and loading. Large diameter tubes saturated <br />with resin are quite heavy and must be lifted and loaded <br />mechanically to avoid back and pinching injuries to personnel. <br /> <br />RESIN TRANSFER PIPE PLACEMENT <br /> <br />• Determine the Center of the Tube -- Prior to placing the resin transfer <br />pipe into the liner, it is extremely important to count the number of polyester <br />felt layers used to compose the tube so that the resin is injected into the <br />middle of the tube. Failure to properly inject the resin into the center of <br />the tube will adversely affect the wet out and slow it tremendously. <br />Injecting the resin between the wrong layers causes the felt layers to act <br />as a filter and the resin must pass through an extra layer on one side of <br />the tube to fully wet out that side. <br /> <br />• Transfer Pipe Placement -- Once the felt layers of the tube are counted, <br />the resin transfer pipe should be inserted approximately 2-4 feet into the <br />center of the secured and elevated tube through the burp tube. Secure <br />the resin transfer pipe above the tube with a rope or clamp to insure the <br />pipe will not back out of the tube during the filling process. The use of <br />diaphragm pumps for resin transfer typically causes the resin transfer pipe <br /> <br />
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