 |
Virginia Administrative Code (Last Updated: January 10, 2017) |
 |
Title 12. Health |
|
Agency 5. Department of Health |
|
Chapter 590. Waterworks Regulations |
Section 1070. Appurtenances
-
A. Valves.
Pumps shall be adequately valved to permit satisfactory operation, maintenance, and repair of the equipment. If foot valves are necessary, they shall have a net valve area of at least two and one half times the area of the suction pipe and they shall be screened. Each pump shall have a positive acting check valve on the discharge side between the pump and shutoff valve.
B. Piping, in general, shall:
1. Be designed so that the friction head will be low;
2. Not be subject to contamination;
3. Be sloped in one direction to drains;
4. Have adequate cleanouts;
5. Have watertight joints;
6. Be protected against surge or water hammer;
7. Be such that each pump has an individual suction line or the lines shall be so manifolded that they will insure similar hydraulic and operational conditions; and
8. Have proper legends to identify the contents of the pipes (see 12VAC5-590-720 L).
C. Gauges and meters.
The station should have indicating, totalizing, and recording metering of the total water pumped. Each pump shall:
1. Have a standard pressure gauge on its discharge line;
2. Have a compound gauge on its suction line; and
3. Have recording gauges in the larger stations as required by the division.
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 a break tank open to atmospheric pressure; and
2. Have an air gap between feeder line and spill line of the tank, at least two inches or two pipe diameters, whichever is greater.
E. Controls.
Pumps, their prime movers, and all accessories shall be controlled in such a manner that they will operate at their rated capacity without overloading. Where two or more pumps are installed, provision shall be made for proper alternation. Alternation may be automatic or manual. Provision shall be made to prevent operation of the pump during the backspin cycle. Electrical controls should be located above grade.
F. Power.
When power failure would result in cessation of the minimum essential service, the power supply shall be provided from at least two independent sources or an auxiliary source shall be provided.
G. Auxiliary power supply.
When automatic prelubrication of pump bearings is necessary and an auxiliary power supply is provided, the prelubrication line shall be provided with a valved by-pass around the automatic control.
Historical Notes
Derived from VR355-18-010.07 § 3.44, eff. August 1, 1991.