Lift Station Electrical and Control Devices Selection & Technical Requirements

This article is about Lift Station Electrical and Control Devices Selection & Technical Requirements and Lift Station Electrical and Control Receiving, Handling, Storage and preservation of Plumbing System as per international codes and standards.

Lift Station Electrical and Control Devices Selection & Technical Requirements

Receiving

1. Wet well liquid level sensing devices shall meet the following requirements:
   (a) The device shall be either sealed, single-pole, float sensors, conductance-actuated electrodes, admittance probes or ultrasonic probes.
   (b) The sensing devices shall be in a stilling enclosure.”
2. The enclosure shall be of dead front construction and shall have two doors and two compartments that are separated by a barrier. One compartment shall house the motor starter package and the other shall house the liquid level and alarm controls.
3. The doors of the enclosure shall overlap to prevent them from being opened with the pump motor disconnect devices in the “ON” position.
4. Motor starters shall be full voltage, nonreversing magnetic, with overload relay protection. The heater coil rating shall be adjustable within 6% of full load motor current.
5. Control transformers equipped with an integral fuse block for secondary protection shall be provided for each starter
6. The pump alternator shall be a motor driven device with three separate Single Pole Double Throw (SPDT) micro-switches that are positioned by cams located on the shaft of the motor.
7. 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.
8. A Double Pole Double Throw (DPDT) control circuit power switching plug-in relay shall be provided to enable each motor disconnect device to provide a continuous 120-volt nominal source of power to the alarm system, to the DPDT plug-in alarm “OFF” relay, to the liquid level controls, and to the moisture detection controls for submersible pumps
9. Submersible pumps shall have probes within the oil reservoir for the purpose of detecting a leakage of the outer seal of the motor. A warning light, a test light, and a test push button shall be provided for each motor

Handling, Storage and Preservation

Verify that approved procedures for handling, storage and preservation of Control and Electrical lists all the required inspection schedules for maintaining the quality of electrical / instrumentation components.

International Codes and Standard References for Lift Station Electrical and Control Devices

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