La. Admin. Code tit. 51 § XII-223

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

Section XII-223 - Appurtenances

A. Valves. Each pump shall have:

1. an isolation valve on the intake and discharge side of the pump to permit satisfactory operation, maintenance and repair of the equipment;

2. a positive-acting check valve on the discharge side between the pump and the shut-off valve;

a. If foot valves are necessary, they shall have a net valve area of at least 2 1/2 times the area of the suction pipe and they shall be screened.

b. Surge relief valves or slow acting check valves if used shall be designed to minimize hydraulic transients.

B. Piping. In general, piping shall:

1. be designed so that the friction losses will be minimized;

2. not be subject to contamination;

3. have watertight joints;

4. be protected against surge or water hammer and provided with suitable restraints where necessary; and

5. be designed such that each pump has an individual suction line or that the lines shall be so manifolded that they will insure similar hydraulic and operating conditions.

C. Gauges and Meters. The station shall have a flow rate indicator and totalizing meter, and a method of recording the total water pumped and station water pressure. Each pump:

1. shall have a standard pressure gauge on its discharge line;

2. shall have a compound gauge on its suction line;

D. Water Seals. Water seals shall not be supplied with water of a lesser sanitary quality than that of the water being pumped. Where pumps are sealed with potable water and are pumping water of lesser sanitary quality, the seal shall:

1. be provided with either an approved reduced pressure principle backflow preventer or a break tank open to atmospheric pressure; and

2. where a break tank is provided, have an air gap of at least six inches or two pipe diameters, whichever is greater, between the feeder line and the flood rim of the tank.

E. Controls. Pumps, their prime movers and accessories, shall be controlled in such a manner that they will operate at rated capacity without dangerous overload. Where two or more pumps are installed, provisions shall be made for alternations.

1. Motors shall be equipped with a non-reversing ratchet or other mechanical means to prevent backspin. If mechanical means are not provided, provisions shall be made to prevent energizing the motor in the event of a backspin cycle.

2. Electrical controls shall be located at least two feet above the 100-year flood elevation, but in no case less than two feet above the ground surface.

3. Equipment shall be provided or other arrangements made to prevent surge pressures from activating controls which switch on pumps or activate other equipment outside the normal design cycle of operation.

F. Standby Power. To ensure continuous service when the primary power has been interrupted, a power supply shall be provided from a standby or auxiliary source where necessary to maintain minimum 20 psig pressure throughout the system based on systems average hourly demand during the peak annual day.

1. If standby power is provided by onsite generators or engines, the fuel storage:

a. shall have a minimum supply of 72 hours; and

b. the fuel line must be designed to protect the water supply from contamination (see §135).

G. When automatic pre-lubrication of pump bearings is necessary and an auxiliary power supply is provided, design shall assure that pre-lubrication is provided when auxiliary power is in use, or that bearings can be lubricated manually before the pump is started.

H. All oil or grease lubricants which come into contact with the potable water shall be listed in NSF/ANSI Standard 60.

La. Admin. Code tit. 51, § XII-223

Promulgated by the Department of Health, Office of Public Health, LR 44334 (2/1/2018), effective 8/1/2018.

AUTHORITY NOTE: Promulgated in accordance with the provisions of R.S. 40:4.A.(8), 40:4.13.D.(1)(2) and 40:5.A.(2)(3)(5)(6)(7)(17).