La. Admin. Code tit. 51 § XII-229

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

Section XII-229 - Hydropneumatic Tank Systems

A. Pressure tanks shall meet ASME code requirements or an alternative approved by the state health officer. Any alternative must be rated to at least 1.5 times the maximum discharge pressure of the pump.

B. Location. The tank shall be located above normal ground surface.

C. System Sizing. The following criteria applies to the sizing of hydropneumatic systems.

1. The capacity of the wells and pumps in a hydropneumatic system shall be at least five times the average daily demand expressed in gallons per minute.

2. The gross volume of the hydropneumatic tank, in gallons, shall be at least ten times the capacity of the largest pump, rated in gallons per minute. For example, a 250 gpm pump shall be a minimum of 2,500 gallon pressure tank, unless other measures (e.g., variable speed drives in conjunction with the pump motors) are provided to meet the maximum demand.

3. Sizing of hydropneumatic storage tanks must consider the need for disinfectant contact time.

D. The hydropneumatic tank(s) shall have bypass piping to permit operation of the system while the tank is being repaired or painted.

E. Appurtenances. Each tank shall have an access manhole, a drain, and control equipment consisting of a pressure gauge, water sight glass, automatic or manual air blow-off, means for adding air, and pressure operated start-stop controls for the pumps.

1. A pressure relief valve shall be installed and be capable of handling the full pumpage rate of flow at the pressure vessel design limit.

2. Where practical the access manhole should be 24 inches in diameter. The water sight glass shall not be mandatory if an automated control to maintain the proper water-to-air ratio in the tank is provided.

La. Admin. Code tit. 51, § XII-229

Promulgated by the Department of Health, Office of Public Health, LR 44338 (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).