Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS
Section 58.01.08.541 - FACILITY AND DESIGN STANDARDS: PUMPING FACILITIES
Universal Citation: ID Admin Code 58.01.08.541
Current through August 31, 2023
Pumping facilities shall be designed to maintain the sanitary quality of pumped water. (3-24-22)
01. Pump Houses. Unless otherwise approved by the Department based on documentation provided by the design engineer, pump house components shall 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: (3-24-22)
a. Pump houses shall 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. (3-24-22)
b. Pump
houses shall be protected from flooding and shall be adequately drained. The
ground surface shall be graded so as to lead surface drainage away from the
pump house. Unless otherwise approved by the Department based on documentation
provided by the design engineer, the floor surface shall be at least six (6)
inches above the final ground surface and pump house components shall be
located at least six (6) inches above the floor surface. (3-24-22)
c. Pump houses shall be of durable
construction, fire and weather resistant, and with outward-opening doors. All
underground structures shall be waterproofed. (3-24-22)
d. Provisions shall 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.
(3-24-22)
e. Ventilation shall
conform to existing local and/or state codes. Adequate ventilation shall 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.
(3-24-22)
f. Pump houses shall be
provided with a locking door or access to prohibit unauthorized entrance and
shall be protected to prevent vandalism and entrance by animals. Plans and
specifications for pump houses must provide enough detail to enable the
reviewing engineer to determine that the facility is secure, safe, accessible,
and that it conforms to electrical and plumbing codes. (3-24-22)
g. Pump houses shall be kept clean and in
good repair and shall not be used to store toxic or hazardous materials other
than those materials required for treatment processes. (3-24-22)
h. A suitable outlet shall be provided for
drainage from pump glands without discharging onto the floor.
(3-24-22)
i. Floor drains shall not
be connected to sewers, storm drains, chlorination room drains, or any other
source of contamination unless otherwise approved by the Department based on
documentation provided by the design engineer. Gas chlorination room drains
shall not be connected to any other drainage system and should terminate in a
properly located below ground sump. Sumps for pump house floor drains shall not
be closer than thirty (30) feet from any well. (3-24-22)
j. Adequate space shall be provided for the
installation of potential additional units and for the safe and efficient
servicing of all equipment. (3-24-22)
k. Suction basins shall 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. (3-24-22)
l. Pump houses shall be designed to allow
efficient equipment servicing. Crain-ways, hoist beams, eyebolts, or other
adequate facilities for servicing or removal of pumps, motors or other heavy
equipment shall be provided. Openings in floors, roofs or wherever else shall
be provided as needed for removal of heavy or bulky equipment.
(3-24-22)
m. All remote controlled
stations shall be electrically operated and controlled and shall have signaling
apparatus of proven performance. Signaling apparatus shall report automatically
when the station is out of service. (3-24-22)
n. Any threaded hose bib installed in the
pump house must be equipped with an appropriate backflow prevention device.
(3-24-22)
02. Pumping Units. At least two (2) pumping units shall be provided for raw water and surface source pumps. Pumps using seals containing mercury shall not be used in public drinking water system facilities. With any pump out of service, the remaining pump or pumps shall be capable of providing the peak hour demand of the system 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 shall meet the following requirements: (3-24-22)
a. The pumps shall have ample
capacity to supply the maximum demand against the required pressure without
dangerous overloading. (3-24-22)
b.
The pumps shall be driven by prime movers able to meet the maximum horsepower
condition of the pumps. (3-24-22)
c. The pumps shall be provided with readily
available spare parts and tools. (3-24-22)
d. The pumps shall be served by control
equipment that has proper heater and overload protection for air temperature
encountered. (3-24-22)
e. Suction
lift shall be avoided if possible. When suction lift is used, it shall be
within the limits allowed by the manufacturer of the pumps, and provision shall
be made for priming the pumps. (3-24-22)
f. Prime water must not be of lesser sanitary
quality than that of the water being pumped. Means shall be provided to prevent
either backpressure or backsiphonage backflow. When an air-operated ejector is
used, the twenty-four (24) mesh or similar non-corrodible screened intake shall
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 reviewing authority. Vacuum priming may be used.
(3-24-22)
03. Appurtenances. The following appurtenances shall be provided for all water pumps. Additional requirements specific to well pumps are provided in Section 511. (3-24-22)
a. Pumps shall be protected against
freezing and 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 (2.5) times the area of the suction pipe and
they shall be screened. Each pump shall 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 shall be designed to minimize hydraulic transients.
(3-24-22)
b. In general, piping
shall be designed so that it will have watertight joints, be protected against
surge or water hammer, be provided with suitable restraints where necessary, be
designed so that friction losses will be minimized, and not be subject to
contamination. Each pump shall have an individual suction line or the suction
lines shall be manifolded such that they will ensure similar hydraulic and
operating conditions. (3-24-22)
c.
Each pump station shall have a standard pressure gauge on its discharge line
and suction line. (3-24-22)
d.
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: (3-24-22)
i. Be provided with either an approved
reduced pressure principle backflow preventer or a break tank open to
atmospheric pressure, (3-24-22)
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. (3-24-22)
e. Pumps, their prime movers, and accessories
shall 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 shall be made for alternation. Provision shall be made to prevent
energizing the motor in the event of a backspin cycle. Equipment shall 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. (3-24-22)
04. Booster Pumps. In addition to other applicable requirements in Section 541, booster pumps must comply with the following: (3-24-22)
a. In-line booster
pumps shall maintain an operating pressure that is consistent with the
requirements specified in Subsection
552.01, and shall be supplied
with an automatic cutoff when intake pressure is less than or equal to five (5)
psi. (3-24-22)
b. Booster pumps
with a suction line directly connected to any storage reservoirs shall be
protected by an automatic cutoff to prevent pump damage and avoid excessive
reservoir drawdown. (3-24-22)
c.
Each booster pumping station shall 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. (3-24-22)
Disclaimer: These regulations may not be the most recent version. Idaho may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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