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Booster pump systems may be of the constant speed type or the variable frequency drive type. Each pump or pumps shall have sufficient capacity to furnish an adequate supply of water for any purpose. When one pump is installed it shall run continuously or when a multipump system is installed the lead pump shall run continuously. A pressure reducing valve shall be installed on the discharge side of each constant speed pump.
Gravity tanks operating at atmospheric pressure shall be installed as required by Section 18-29-606.5.4.
When a pump is directly connected to a city water main, a low pressure cutoff switch on the pump shall be installed to prevent the creation of pressures less than 5 psi (35 kPa) on the suction side of the water system and within 5 feet (1525 mm) of the pump suction inlet, and a pressure gauge shall be installed between the shutoff valve and pump.
Exception: Fire pumps.
When a water system in any building, structure or premises is supplied with other than city water or is equipped for service other than from the city mains or which is supplied with city water which has been previously used for any purpose, each service from the city water system shall enter through a receiving tank for the purpose of preventing water from the secondary system from flowing back into the city mains.
Check valves which are noiseless in their operation and air chambers of sufficient air cushion capacity shall be installed in the suction pipe and the discharge pipe of each house pump, or other water pressure increasing device. Where such check valves are of the slow-acting type and the operation thereof entirely eliminates the shocks, strains, stresses, and excess noises caused by the operation of such pump or device, the installation of air chambers may be dispensed with.
No check valve shall be installed unless the design and construction thereof shall first have been approved by the Commissioner of Buildings or Commissioner of Water Management.
(Amend Coun. J. 11-8-12, p. 38872, § 352; Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 24)
All surge tanks, receiving reservoirs, gravity storage tanks, house storage tanks, or tanks of any description used for receiving or storing city water at atmospheric pressure, shall be supplied an approved slow-acting automatic control valve. The discharge outlet of the control valve shall be directly connected to the receiving unit at a distance of 6 inches (150 mm) above the top of a horizontal overflow pipe. For a vertical overflow pipe, the distance shall be 6 inches (150 mm) plus the diameter of the overflow pipe. The overflow pipe connection shall have an area of not less than twice that of the supply opening.
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