Lift Station Control System Installation & Design Specification

This article is about Checklist, Lift Station Control System Installation & Design Specification of Plumbing System as per international codes and standards.

Lift Station Control System Installation & Design Specification

1. Lift station control systems shall consists of wet well liquid level sensing devices, a motor control panel and an alarm system
2. Each lift station shall have two independent power supply sources, each fed from separate transformers.
3. The power supply sources shall be interconnected with an automatic transfer switch to provide a continuous source of power to the lift station. Emergency generator may also be used as a second power source.
4. Exception: Power feeds from a secondary selective bus system with automatic transfer scheme fulfills the above requirement.”
5. Wet well liquid level sensing shall be either sealed, single-pole, float sensors, conductance-actuated electrodes, admittance probes or ultrasonic probes or the sensing device shall be in a stilling enclosure
6. NEMA Type 1 with a separate weather and dust proof lock or provisions for locking shall be used outside of buildings.
7. NEMA Type 1 motor control enclosures with gasketed doors shall be used inside of buildings.
8. NEMA Type 4X with a separate weather and dust proof lock or provision for locking shall be used outside of buildings.”
9. In plant operating areas, pump failure alarms for both sanitary and industrial wastewater shall be connected to the responsible area’s digital control system (DCS). An audiovisual device (a light) shall be installed at the lift station for external observation
10. Alarm systems, which activate in cases of power failure or pump failure, shall be provided for lift stations.
11. Where a sanitary wastewater facility in a community or construction camp does not have 24-hour shift coverage, lift station alarms shall be telemetered to a manned location.
    “Sensors for a duplex pump system shall be set to provide the following:
    a) Low Level Sensor: All pumps off.
    b) First Level Sensor: Lead pump on.
    c) Second Level Sensor: Both pumps on.
    d) High Level Sensor: Actuate high level alarm”
12. Liquid level controls shall be off/on switch devices that open and close in response to predetermined liquid elevations and that cause the pump(s) to start or stop.
13. The pump shut-off level shall not be less than 300 mm above the pump suction level or not less than the distance recommended by the pump manufacturer, whichever is greater.
14. Wet well high liquid level shall be at least 300 mm below the invert of the lowest incoming sewer.

International Codes and Standard References for Lift Station Control System Installation

1-SAES-A-104 – Wastewater Treatment, Reuse and Disposal.
2-SAES-S-010 – Sanitary Sewers.

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