Booster Pump Repair London

Booster pump faults we repair

A booster set is a pump, a pressure vessel and a control device working together, and each one fails in its own way. A pump that runs constantly and never satisfies is usually worn — impeller clearances open up and the pump can no longer generate its rated head. A pump that starts and stops every few seconds has almost always lost the pre-charge in its accumulator, so there is no stored volume to absorb small draw-offs. A pump that will not start at all is more often a control, supply or dry-run fault than a dead motor. We prove which before quoting.

• Worn impellers, diffusers and wear rings
• Failed mechanical seals and weeping pump bodies
• Waterlogged or ruptured accumulator diaphragms
• Pressure switch and transducer drift or failure
• Dry-run and low-suction protection lockouts
• Motor, capacitor and overload faults

How we diagnose a booster set on site

We start at the inlet, because a starved pump behaves exactly like a failing one. Suction pressure, break tank level and inlet strainer condition are checked first, then we record cut-in and cut-out pressures against the set point, test the accumulator pre-charge with the water side drained, and log the running current against the motor plate. On variable speed sets we interrogate the drive for fault history. That sequence finds the real fault instead of replacing a serviceable pump and hitting the same problem a fortnight later.

• Inlet, break tank and strainer checks first
• Cut-in, cut-out and set point pressures recorded
• Accumulator pre-charge tested with the water side drained
• Running current compared with motor nameplate
• Drive and controller fault history downloaded

Repairing rather than replacing

Most booster pumps are worth repairing. Seals, bearings, impeller stacks, pressure switches, transducers, accumulators and control boards are all available as spares for the common Grundfos, Stuart Turner, Lowara, Wilo, DAB, Calpeda and Salamander ranges, and a repair is typically a fraction of a replacement set. Replacement is the honest recommendation when the pump body is eroded, the set is obsolete with no spares, or the duty was wrong from the start. We tell you which applies and price both.

Blocks, commercial buildings and 24/7 cover

A failed booster in a block of flats or a hotel is an emergency, not an inconvenience, because upper floors lose water entirely. We carry common seals, switches and accumulators on the van, isolate and run duty/standby sets on the healthy pump where one is available, and keep the building in water while parts are sourced. For managed sites we can put the set on a planned maintenance visit afterwards so the failure is not repeated.

• Emergency attendance for blocks, hotels and offices
• Temporary running on the healthy pump of a twin set
• Common spares carried on the van
• Plant room isolation and safe recommissioning