La. Admin. Code tit. 51 § XIII-729

Current through Register Vol. 50, No. 11, November 20, 2024

Section XIII-729 - Pumping Stations [formerly Section VIII of Appendix A]

A. [Formerly paragraph A:8.1 of Appendix A] When the elevation of a site prevents the use of gravity flow to convey liquid from one location to another, a pumping station [§1501. B 19 (Figure 22)], consisting of a holding tank, pump(s), piping, electrical controls, and other equipment as necessary, must be provided.

B. [Formerly paragraph A:8.2 of Appendix A ] Many manufacturers build pumps, and in some cases complete pump stations, for the special purpose of handling wastewater, either raw, partially treated, or treated. Such specially built pump stations may be used, provided all other code requirements are met.

C. [Formerly paragraph A:8.3 of Appendix A] Pumps utilized in pump stations must be suitable for the specific application proposed. Pumps must be provided with impellers and casings constructed of corrosion resistant materials.

D. [Formerly paragraph A:8.4 of Appendix A] Pumps shall be provided to accommodate required elevation and hydraulic heads and peak flow rates, and be cycled in a manner not to be unduly disruptive to any downstream system.

E. [Formerly paragraph A:8.5 of Appendix A] The pump station holding tank must be constructed of materials suitable for septic tank use in accordance with §715. I and O of this Subchapter. Additionally, molded fiberglass, reinforced polyester (FRP) resin tanks having a minimum wall thickness of 1/4" are also acceptable.

F. [Formerly paragraph A:8.6 of Appendix A] Holding tanks shall be constructed and installed with suitable foundations to prevent settling due to soil conditions or floating of the tank due to high water table elevations.

G. [Formerly paragraph A:8.7 of Appendix A] Pump station holding tanks shall be constructed and installed so as to be watertight. All wall seams, seams between walls and tank floor, and openings such as for pipes and wiring shall be sealed watertight. Additionally, all holding tank covers and access openings shall be attached in watertight manner by gaskets or grooves and should be sufficiently above the ground, but in no case less than 3 inches above ground, to prevent the entrance of surface runoff water.

H. [Formerly paragraph A:8.8 of Appendix A] The holding tank shall have a minimum diameter or dimension of 24 inches. The cover shall be equipped with an access opening of sufficient size to allow for pump maintenance and removal, but in no case less than 12 inches in diameter or dimension.

I. [Formerly paragraph A:8.9 of Appendix A] Pumps shall be installed in such a manner as to allow for removal and/or maintenance of the pump without necessitating entry into the holding tank by maintenance personnel. Pumps shall be provided with suitable means of quick, convenient disconnection from discharge piping and electrical wiring. Provisions must be made for lifting the pump from the holding tank with minimal exposure to the liquid in the tank.

J. [Formerly paragraph A:8.10 of Appendix A] Suitable level control devices for use in the harsh, corrosive environment encountered, shall be provided to control pump operation. The level controls shall provide for the following functions: "pump off," "pump on," and "high water alarm."

1. [Formerly paragraph A:8.10-2 of Appendix A] All materials utilized within the holding tank, whether above or below water level, shall be constructed of materials resistant to corrosion from the hostile operating environment of the tank.

2. [Formerly paragraph A:8.10-3 of Appendix A] An audible and visual "high water alarm" shall be provided and shall be located in a conspicuous location. A reset button should be provided for the audible signal in a convenient location so that relief can be easily obtained.

3. [Formerly paragraph A:8.10-4 of Appendix A] The "pump off" level shall be set at the minimum elevation as recommended by the specific pump's manufacturer.

4. [Formerly paragraph A:8.10-5 of Appendix A] The "pump on" level shall be set at elevation to provide a minimum working volume of 10 percent of the average daily design flow of the treatment system.

5. [Formerly paragraph A:8.10-6 of Appendix A] The "high water alarm" level shall be set so as to provide for a net storage volume between the "pump on" level and the "high water alarm level" of 10 percent of the average daily design flow of the treatment system.

6. [Formerly paragraph A:8.10-7 of Appendix A] A reserve volume may be provided between the "high water level" and the invert of the inlet pipe to the holding tank, if so desired.

K. [Formerly paragraph A:8.11-1 of Appendix A] All electrical wiring and controls must be appropriate for the applications for which they are used and meet prevailing electrical codes. Due consideration for the exposure to a harsh environment and the need for watertight connections and conduit must be accounted for in all electrical work.

1. [Formerly paragraph A:8.11-2 of Appendix A] Electrical connections to the main panel in the house must be made according to prevailing electrical codes.

2. [Formerly paragraph A:8.11-3 of Appendix A] The pump must be wired for automatic level control with a manual override located at the control panel.

L. [Formerly paragraph A:8.12 of Appendix A] Raw sewage pumps and piping must accommodate the passage of 2-inch solids.

M. [Formerly paragraph A:8.13 of Appendix A] Suction and discharge piping for sewage effluent pumps must conform to the pump manufacturer's recommendations. However, piping should not be less than 1.25 inches in diameter and be capable of withstanding a pressure of 75 psi.

La. Admin. Code tit. 51, § XIII-729

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 28:1355 (June 2002).

AUTHORITY NOTE: Promulgated in accordance with R.S. 40:4(A)(6) and R.S. 40:5(9)(20).