Section 327IAC3-6-28. Suction-lift type lift stations

   (a) In addition to the requirements for lift stations described throughout this rule, suction-lift stations shall have one (1) of the following type pumps that are in accordance with the associated requisite conditions:

(1) Self priming pumps shall:

(A) be capable of rapid priming and repriming at the lead pump on elevation;

(B) be capable of self-priming and repriming automatically under design operating conditions;

(C) have suction piping that shall not exceed twenty-five (25) feet in length;

(D) be capable of maintaining priming lift at the lead pump on elevation that shall include a safety factor of at least four (4) feet from the maximum allowable priming lift for the specific equipment at design operating conditions; and

(E) be capable of maintaining a combined total of the dynamic suction lift at the pump off elevation and the required net positive suction head at design operating conditions that shall not exceed twenty-two (22) feet.

(2) Vacuum priming pumps shall:

(A) be equipped with dual vacuum pumps capable of automatically and completely removing air from the suction-lift pump; and

(B) be capable of maintaining a combined total of the dynamic suction lift at the pump off elevation and the required net positive suction head at design operating conditions that shall not exceed twenty-two (22) feet.

  (b) The pump equipment compartment for all pump types of subsection (a) shall be located above grade or separate from the wet well. Wet well access shall be at least twenty-four (24) inches in diameter but shall not be through the pump equipment compartment. Valving shall not be located in the wet well. (Water Pollution Control Division; 327 IAC 3-6-28; filed May 17, 1999, 12:11 p.m.: 22 IR 3097; readopted filed Apr 11, 2005, 2:45 p.m.: 28 IR 2470; readopted filed Jun 15, 2011, 11:15 a.m.: 20110713-IR-327110193BFA)