DualPumps

Duty/standby means one pump does the work while the second sits idle, only cutting in automatically if the lead pump fails or can't keep up — this gives you resilience. Duty/assist means both pumps run together at times of peak flow, alternating which one leads to even out wear. Most domestic sewage and surface water applications use duty/standby; larger commercial sites with variable flow often benefit from duty/assist.

A dual pump setup gives you built-in backup — if one pump fails or is out for servicing, the second takes over and your system keeps running rather than backing up. This is particularly important for sewage pump stations and properties where a failed single pump means flooding or overflowing waste. Many building control officers and package sewage treatment plant specifications will require duty/standby pumping for exactly this reason.

Most dual pump stations we supply include a control panel that automatically alternates the lead pump and switches to the second on fault or high level. A high-level alarm — audible, visual, or both — is standard and strongly recommended, as it's often your first warning of a blockage or pump failure. Always check the specification of the individual station, as panel features (volt-free contacts, telemetry options) vary between models.

Sizing depends on the number of occupants or population equivalent for sewage applications, the peak surface water flow rate for drainage, and the total pumping head (vertical lift plus pipe run losses). Under-sizing leads to pumps that cycle too often and wear out quickly; over-sizing wastes energy and money. If you're unsure, provide us with occupancy numbers, pipe run length and rising main details and we can help you match the right pump and station.

Most domestic dual pump stations run happily on a standard single-phase 230V supply, but larger commercial units with higher-power pumps often require three-phase 400V. Check the technical specification before ordering, and always have the electrical connection carried out by a qualified electrician in line with wiring regulations. Outdoor pump stations also need a suitably rated, weatherproof isolator near the unit.

We'd recommend an annual service as a minimum, checking impellers for wear, float switches for correct operation, and non-return valves for blockages or fouling. Because there are two pumps, you can often service one while the other keeps the system running, minimising disruption. Make sure the chamber has accessible covers at ground level, as tight or buried access makes routine servicing far more time-consuming and costly.