Section 58.01.08.541 - PUMPING FACILITIESPumping facilities must be designed to maintain the sanitary quality of pumped water.
01.Pump Houses. Unless otherwise approved by the Department, pump house components must be located above-grade. The following requirements apply to pump houses as defined in Section 003 unless it can be shown that some or all of these requirements are not needed to protect the combination of system components in a given structure:a. Pump houses must be readily accessible for operation, maintenance, and repair at all times and under all weather conditions unless permitted to be out of service for a period of inaccessibility.b. Pump houses must be protected from flooding and must be adequately drained. The ground surface will be graded so as to lead surface drainage away from the pump house. Unless otherwise approved by the Department, the floor surface will be at least six (6) inches above the final ground surface and pump house components will be located at least six (6) inches above the floor surface.c. Pump houses must be of durable construction, fire and weather resistant, and with outward-opening doors. All underground structures must be waterproofed.d. Provisions must be made for adequate heating for the comfort of the operator and the safe and efficient operation of the equipment. In pump houses not occupied by personnel, only enough heat need be provided to prevent freezing of equipment or treatment processes.e. Ventilation must conform to existing local and state codes. Adequate ventilation will be provided for all pumping stations for operator comfort and dissipation of excess heat and moisture from the equipment. In all cases, measures must be taken to minimize corrosion of metallic and electrical components.f. Pump houses must be provided with a locking door or access to prohibit unauthorized entrance and must be protected to prevent vandalism and entrance by animals. Plans and specifications for pump houses must provide enough detail to enable the Department to determine that the facility is secure, safe, accessible, and that it conforms to electrical and plumbing codes.g. Pump houses must be kept clean and in good repair and may not be used to store toxic or hazardous materials other than those materials required for treatment processes.h. A suitable outlet must be provided for drainage from pump glands without discharging onto the floor.i. Floor drains may not be connected to sewers, storm drains, chlorination room drains, or any other source of contamination unless otherwise approved by the Department. Gas chlorination room drains may not be connected to any other drainage system and must terminate in a properly located below ground sump. Sumps for pump house floor drains may not be closer than thirty (30) feet from any well.j. Adequate space must be provided for the installation of potential additional units and for the safe and efficient servicing of all equipment.k. Suction basins must be watertight, have floors sloped to permit removal of water and settled solids, be covered or otherwise protected against contamination, and have two (2) pumping compartments or other means to allow the suction basin to be taken out of service for inspection maintenance or repair.l. Pump houses must be designed to allow efficient equipment servicing. Crane ways, hoist beams, eye bolts, or other adequate facilities for servicing or removal of pumps, motors or other heavy equipment will be provided. Openings in floors, roofs or wherever else must be provided as needed for removal of heavy or bulky equipment.m. All remote controlled stations must be electrically operated and controlled and have signaling apparatus of proven performance. Signaling apparatus must report automatically when the station is out of service.n. Any threaded hose bib installed in the pump house must be equipped with an appropriate backflow prevention device.02.Pumping Units. At least two (2) pumping units must be provided for raw water and surface source pumps. Pumps using seals containing mercury may not be used in PWS facilities. With any pump out of service, the remaining pump or pumps must be capable of providing the peak hour demand of the PWS or a minimum of the maximum day demand plus equalization storage. See Subsection 501.18 for general design requirements concerning fire flow capacity and Subsection 501.07 regarding reliability and emergency operation. The pumping units must meet the following requirements:a. The pumps have ample capacity to supply the maximum demand against the required pressure without dangerous overloading.b. The pumps are driven by prime movers able to meet the maximum horsepower condition of the pumps.c. The pumps are provided with readily available spare parts and tools.d. The pumps are to be served by control equipment that has proper heater and overload protection for air temperature encountered.e. Suction lift is avoided if possible. When suction lift is used, it must be within the limits allowed by the manufacturer of the pumps, and provision will be made for priming the pumps.f. Prime water must not be of lesser sanitary quality than that of the water being pumped. Means will be provided to prevent either backpressure or back-siphonage backflow. When an air-operated ejector is used, the twenty-four (24) mesh or similar non-corrodible screened intake will draw clean air from a point at least ten (10) feet above the ground or other source of possible contamination, unless the air is filtered by an apparatus approved by the Department. Vacuum priming may be used.03.Appurtenances. The following appurtenances must be provided for all water pumps. Additional requirements specific to well pumps are provided in Section 511. a. Pumps must be protected against freezing and valved to permit satisfactory operation, maintenance, and repair of the equipment. If foot valves are necessary, they must have a net valve area of at least two and one-half (2.5) times the area of the suction pipe and be screened. Each pump must have an accessible check valve on the discharge side between the pump and the shut-off valve or a combination valve that performs both control valve and check valve functions. Surge relief measures must be designed to minimize hydraulic transients.b. Piping must be designed with watertight joints, friction losses minimized, protection against surge or water hammer, suitable restraints, and not be subject to contamination.c. Each pump must have an individual suction line or manifolded suction lines such that they will ensure similar hydraulic and operating conditions.d. Each pump station must have a standard pressure gauge on its discharge line and suction line.e. Water seals may 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 must:i. Be provided with either an approved reduced pressure principle backflow preventer or a break tank open to atmospheric pressure,ii. Where a break tank is provided, have an air gap of at least six (6) inches or two (2) pipe diameters, whichever is greater, between the feeder line and the flood rim of the tank.f. Pumps, their prime movers, and accessories must be controlled in such a manner that they will operate at rated capacity without dangerous overload. Where two (2) or more pumps are installed, provision must be made for alternation. Provision must be made to prevent energizing the motor in the event of a backspin cycle. Equipment will be provided or other arrangements made to prevent surge pressures from activating controls which switch on pumps or activate other equipment outside the normal design cycle of operation.04.Booster Pumps. In addition to other applicable requirements in Section 541, booster pumps must comply with the following:a. In-line booster pumps must maintain an operating pressure that is consistent with the requirements specified in Subsection 552.01, and be supplied with an automatic cutoff when intake pressure is less than or equal to five (5) psi.b. Booster pumps with a suction line directly connected to any storage reservoirs must be protected by an automatic cutoff to prevent pump damage and avoid excessive reservoir drawdown.c. Each booster pumping station must contain not less than two (2) pumps with capacities such that peak hour demand, or a minimum of the maximum day demand plus equalization storage, can be satisfied with any pump out of service. See Subsection 501.18 for general design requirements concerning fire flow capacity.Idaho Admin. Code r. 58.01.08.541