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Oklahoma Administrative Code (Last Updated: March 11, 2021) |
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TITLE 252. Department of Environmental Quality |
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Chapter 656. Water Pollution Control Facility Construction Standards |
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Subchapter 7. Pump Station Standards |
SECTION 252:656-7-4. Emergency operation
Latest version.
- (a) Design. Design pumping stations to prevent bypassing of raw sewage during periods of power outage or mechanical failure. The pumping station must meet one of the following design conditions:(1) an on-site standby generator with automatic means of activation in the event of a power failure;(2) a portable engine-driven pump with a quick connection to the force main; four hours of emergency storage at the average design flow above the alarm level; and telemetry to the city office during working hours and to the home of the person(s) in responsible charge of the lift station during off-duty hours;(3) 24 hours of emergency storage at the average design flow above the alarm level with an audio/visual alarm system;(4) an on-site engine-driven pump with one hour of emergency storage at design flow above the alarm level and an automatic means of activation; or(5) a portable engine-driven generator with four (4) hours of emergency storage at the design flow above the alarm level, a telemetry alarm system that communicates to the person in charge of the lift station, and a transfer switch with electrical system components that comply with the National Electrical Code requirements that is pre-wired to allow for a ready connection between the lift station and the portable generator.(b) Equipment requirements.(1) General. The following general requirements shall apply to all internal combustion engines used to drive auxiliary pumps, service pumps and electrical generating equipment:(A) Engine protection. The engine must be protected from operating conditions that would result in damage to equipment. Unless continuous manual supervision is planned, protective equipment shall be capable of shutting down the engine and activating an alarm.(B) Size. The engine shall have adequate rated power to start and continuously operate all connected loads. The engines shall be capable of handling the peak capacity of the station.(C) Routine start-up. All emergency equipment shall be provided with instructions indicating the need for regular starting and running of such units at full loads.(D) Equipment protection. Emergency equipment shall be protected from damage due to restoration of regular electrical power.(E) Instructions, tools and parts. Post a complete set of operational instructions, emergency procedures and maintenance schedules at the station. Provide any special tools and spare parts.(2) Engine-driven pumping equipment. Where permanently installed or portable engine-driven pumps are used, the following requirements shall also apply:(A) Pumping capacity. Engine-driven pump(s) shall meet the design pumping requirements unless storage capacity is available for flows beyond pump capacity. Pumps shall be designed for anticipated operating conditions, including suction lift if applicable.(B) Operation. The engine and pump shall be equipped for automatic start-up and operation, and for manual start-up.(C) Portable pumping equipment. Where part or all of the engine-driven pumping equipment is portable, a riser from the force main with quick-connect coupling and appropriate valving shall be provided to hook up portable pumps.(D) Telemetry. Connect a telemetry alarm system from the engine-driven pump to the city office or cell phone during working hours and to the home or cell phone of the person(s) in responsible charge of the lift station during off-duty hours.(3) Engine-driven generating equipment. Where permanently installed or portable engine-driven generating equipment is used, the following requirements shall also apply:(A) Generating capacity. Generating unit size shall be adequate to provide power for pump motor starting current and for lighting, ventilation, and other auxiliary equipment necessary for safety and proper operation of the lift station. Provide sequencing controls to start pump motors unless the generating equipment has capacity to start all pumps simultaneously with auxiliary equipment operating.(B) Operation. Provide for automatic and manual start-up and load transfer. Protect the generator from damaging operating conditions. The engine must start and stabilize at operation speed before assuming the load.(C) Portable generating equipment. If portable generating equipment will be used, include special electrical connections.(c) Overflow basins. General construction of overflow basins shall be in accordance with 252:656-11-3.(d) Alarm systems. Pumping stations shall have an automatic alarm system capable of alerting responsible maintenance personnel of an equipment failure before an overflow occurs, even during a power failure. If telemetry is not provided to an office manned 24 hours per day, then show an equivalent alerting capability.