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RULE §317.2Sewage Collection System

    (F) development of procedures whereby portions of the pressure system may be rerouted with temporary lines in the event of leaks, construction, or repair.

  (3) Pipe selection. Appropriate ASTM, ANSI, or AWWA standards shall be specified for alternative wastewater collection system pipe and joints. Pipe which will be used in pressure sewer systems shall have a minimum sustained working pressure rating of 150 pounds per square inch gauge as per appropriate standard. Pipe selection shall also conform to subsection (a)(1) - (3) and (5) of this section.

  (4) Leakage testing. All alternative wastewater collection systems components shall be tested for leakage. Testing procedures for on-site system components, small diameter gravity sewer systems, and vacuum sewer systems will be approved on a case-by-case basis. Pressure sewer installation shall be tested for leakage with a hydrostatic test. Copies of all test results shall be made available to the executive director upon request. Leakage in the pressure sewer hydrostatic test shall be defined as the quantity of water that must be supplied into the pipe or any valved section thereof to maintain pressure within five pounds per square inch of the specified test pressure after the air in the pipeline has been expelled. The test pressure shall be either a minimum of 25 pounds per square inch gauge or 1.5 times the maximum force main design pressure, whichever is larger. The maximum allowable leakage shall be calculated using the formula in this paragraph. If the quantity of leakage exceeds the maximum amount calculated, remedial action shall be taken to reduce the leakage to an amount within the allowable limit as follows.

Attached Graphic

  (5) Pumps. Pumping units and grinder pumps used in pressure sewer systems should be reliable, easily maintained, and should have compatible characteristics.

    (A) Pumps and grinder pump units shall be provided with two backflow prevention devices (one check valve at tank, to protect against back drainage into tank, second check valve at connection of service line to pressure collection line to protect against leaking sewage in case service line is damaged) and shall be easily accessible for maintenance.

    (B) Sufficient holding capacity shall be provided in the pumping compartment to allow for wastewater storage during power outages and equipment failures. Storage volume should be based on power supply outage records and replacement equipment availability.

    (C) Pumping units shall not be installed in the settling chamber of an interceptor tank if the interceptor tank is to be used for solids reduction.

    (D) Alarms, warning lights, or other suitable indicators of unit malfunction shall be installed at each pumping station.

    (E) Whenever any pumping station handles waste from two or more residential housing units or from any public establishment, dual pump units shall be provided to assure continued service in the event of equipment malfunction.

Source Note: The provisions of this §317.2 adopted to be effective November 26, 2015, 40 TexReg 8341

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