PVC reducing wye

 


The grout is mixed via conventional cement mixing processes and pumped into the tank with a conventional grout pump. The type of grout, a zero-bleed controlled low strength material, is compatible with the tank waste and does not present a hazard to human health during transportation, handling, mixing and pumping. The grout hardens into a cement-like matrix, thus structurally stabilizing the tanks and reducing the spread of contamination.

Eight of the tanks contain a single riser/vent pipe. In addition, four of these tank riser/vent pipes were only 0.07m in diameter. Therefore, a separate system was designed that incorporated the grout delivery piping and off-gas filter system for these tanks. The grout delivery system is similar to the double riser system except that the pipe diameter is only 0.04m. Also, the grout delivery tube is extended into the tank to mitigate grout/air exchange in the small diameter riser. A 0.07m carbon steel wye is located within the system. One branch contains the off-gas system, identical to the double riser system, and the other contains the connection to the grout delivery system. A pressure gauge is also installed on the single riser system.

Solidification materials are added to an OST through a funnel and PVC piping arrangement. The initial system consisted of a plastic funnel, with a 0.06m neck, and 1-meter pieces of 0.05m PVC that screwed together. The final piece of PVC, the piece that protruded into the tank, could be configured to contain a straight end, a 45-degree end, or a 90-degree end depending on the desired projection of material throw. The pieces were screwed together and lowered into the tank riser. Lastly, the funnel was added and used to support the assembly on the tank riser during the material addition.

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PVC reducing wye

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