Current through Vol. 41, No. 13, March 15, 2024
(a)
General requirements.
(1) All pumping stations shall have a minimum
of two (2) pumping units. With any pump out of service, the remaining pump(s)
shall be capable of providing the maximum pumping demand of the
system.
(2) All pumping stations
shall have ample capacity to supply the peak demand against the required
distribution system pressure without dangerous overloading.
(3) All pumping stations shall be driven by
prime movers able to meet the maximum horsepower condition of the
pumps.
(4) All pumping stations
shall be provided with readily available spare parts and tools.
(5) All pumping stations shall be served by
control equipment that has proper heater and overload protection for air
temperature encountered.
(6) All
pumping stations shall provide standby power to ensure the continuous service
when the primary power has been interrupted. Such a standby power supply shall
be provided from at least two (2) independent sources or a standby or an
auxiliary source shall be provided.
(b)
Lubrication. Oil lubrication
of water column vertical shaft bearings or other bearings coming in contact
with potable water is not allowed.
(c)
Pump suction, priming and water
seal.
(1) Provide pump installations
with a positive suction head where possible. Do not exceed a suction head of 15
feet, where installation precludes the use of a positive suction head. The
pumps must be self-priming or equipped with suitable foot valves with a net
valve area at least 22 times that of the suction piping. Pumps that are not
self-priming must have adequate and positive means of priming by vacuum or with
water equal in sanitary quality to that delivered by the pump.
(2) Supply water seals with water equal in
sanitary quality to the water the pump is handling. Where potable water is
supplied to seals for pumps handling non-potable water, supply the water from a
tank fed by a water line terminating at a point at least 6 inches above the
spill line of the tank, or from a water line equipped with a RPZ backflow
preventer.
(3) Equip each pump with
an individual suction line from the supply, unless the suction lines are
manifolded to provide hydraulic conditions that will ensure that each pump will
operate in accordance with its design.
(4) Where multiple suctions are installed in
a wet well, space the suctions so that hydraulic interference and deposition of
solids between the suction inlets will not occur.
(d)
Booster pumps. Locate and
control booster pumps used to increase water pressure in the distribution
system so that in normal operation they will not reduce pressure below 25 psi
within the distribution system or below 20 psi at any pump suction. Provide
automatic cutoff of the pump when the pressure drops below 20 psi. Equip pumps
with controls to prevent excessive cycling. Capacity shall meet instantaneous
peak demands with the largest pump out of service. Provide a diversion line and
valves to permit removal of the pump without disrupting water service. Private
booster pumps shall not be allowed for any individual residential service from
the public water supply.
Added at 18 Ok Reg 1612,
eff 6-1-01; Amended at 25 Ok Reg 2304, eff
7-11-08
