1. (1) Applicability.

   1. (a) Section R309-540-8 applies to a hydropneumatic facility that maintains distribution system pressure for a public water system.
   2. (b) Sections R309-540-5 through R309-540-7 apply to a pump, other than a well pump, that supplies water under pressure to a hydropneumatic pressure tank.
   3. (c) Section R309-540-8 applies to air-over-water, diaphragm, and bladder hydropneumatic pressure tanks.

   4. (d) Section R309-540-8 does not apply to:

      1. (i) a surge protection tank;
      2. (ii) pressure relief equipment; or
      3. (iii) a pressure tank dedicated solely to fire suppression.
2. (2) Number of Pumps. A public water system using a hydropneumatic facility to meet the minimum distribution system pressure requirements of Section R309-105-9 shall have at least two pumps installed and in operation at the hydropneumatic facility, unless the hydropneumatic facility is supplied solely by a well pump.

3. (3) Pressure Tank Certification. A hydropneumatic pressure tank shall have:

   1. (a) NSF/ANSI 61 certification; and
   2. (b) ASME Boiler and Pressure Vessel Code certification.
4. (4) Use of Pressure Tank Volume for Water Storage Sizing. A community water system may not use the volume of a hydropneumatic pressure tank to meet the water storage sizing requirements in Section R309-510-8.

5. (5) Pressure Tank Located Below Ground.

   1. (a) A below-ground location for a hydropneumatic pressure tank and appurtenances shall meet the requirements of:

      1. (i) Subsection R309-540-5(2) for flood protection and site drainage;
      2. (ii) Subsection R309-540-5(3) for pump station drainage and flooding prohibition;
      3. (iii) Subsection R309-540-5(4)(b) for access; and
      4. (iv) Subsection R309-540-5(8) for ventilation.

   2. (b) Electrical controls for a hydropneumatic pressure tank located below ground shall be:

      1. (i) located above grade; and
      2. (ii) protected from flooding.
6. (6) Operating Pressure Measurement. A means to measure the operating pressures of a hydropneumatic facility shall be provided.
7. (7) Bypass Piping. Each hydropneumatic tank shall have bypass piping and isolation valves to allow the tank to be removed from service without disruption of water distribution.
8. (8) Pressure Tank Sizing. The minimum volume of a hydropneumatic tank shall be sized to avoid continuous pump cycling as recommended by the manufacturer.

9. (9) Air-Over-Water Pressure Tanks.

   1. (a) An air-over-water pressure tank shall have:

      1. (i) an access opening;
      2. (ii) a drain;
      3. (iii) a means to measure pressure;
      4. (iv) a means to measure the water level in the tank;
      5. (v) an automatic or manual air blow-off;
      6. (vi) a means for adding air; and
      7. (vii) pressure operated start-stop controls for a pump.

   2. (b) Air delivered by a compressor to an air-over-water pressure tank shall be:

      1. (i) drawn from a point above ground;
      2. (ii) free of contamination;
      3. (iii) filtered; and
      4. (iv) oil free.
   3. (c) The volume of water remaining in an air-over-water pressure tank at the lowest pressure setting shall provide a water seal at the water outlet to prevent the leakage of air.

KEY: drinking water, pumps, hydropneumatic systems, individual home booster pumps

Date of Last Change: June 26, 2024

Notice of Continuation: February 10, 2025

Authorizing, and Implemented or Interpreted Law: 19-4-104