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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 656. Water Pollution Control Facility Construction Standards |
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Subchapter 7. Pump Station Standards |
SECTION 252:656-7-2. Suction lift pumps
Latest version.
- The pump equipment compartment shall be above grade or offset and effectively isolated from the wet well. Wet well access shall not be through the equipment compartment. Valving shall not be located in the wet well. The combined total of dynamic suction lift at the "pump off" elevation and required net positive suction head at design operating conditions shall not exceed 22 feet.(1) Self-priming pumps shall be capable of rapid priming and repriming at the "lead pump on" elevation. Suction piping should not exceed the size of the pump suction and shall not exceed 25 feet in total length. Priming lift at the "lead pump on" elevation shall include a safety factor of at least 4 feet from the maximum allowable priming lift for the specific equipment at design operating conditions.(2) Vacuum-priming pump stations shall be equipped with dual vacuum pumps capable of automatically and completely removing air from the suction lift pump. The vacuum pumps shall be adequately protected from damage due to sewage.