Refurbishment of Allen Gwynnes Pumps

Type: 24”v/s Suspended M.F.B. Pumps

CHALLENGE
WGM were contracted to carry out effective repairs on a large SW foul pump at Gailes Pumping Station. After removal and strip down, WGM tabled a number of options to improve the pump reliability and include new innovation to the refurbishment.

SOLUTION
The implementation of a new bearing grade material allowed SW to:
Run the pump more efficiently, eradicate the dedicated grease pump which serviced the old type bronze bearings. Eliminate daily operator visits to maintain and replenish the lubricant. Enhance the whole life of the pump by more than 50%.

MAJOR PARTS SUPPLIED/REFURBISHED

• Bottom Bearing Bush
• Pump Bearing Bush
• Top Thrust Bearing
• Gland Housing Sleeve
• Bearing Spider Sleeve
• Casing Eye rings
• Bearing Housing Sleeve
• Bottom Shaft
• Driving Half Coupling
• Muff Coupling
• Tunnel Tube
• Gasket Set
• Top Shaft
• Gland Packing
• Driven Half Coupling
• Impeller
• Bottom Tunnel Tube
• Shim Set

The complete refurbishment was carried out within 4 weeks and under budget.

CLIENT COMMENTS
WGM demonstrated a solid engineering practice throughout the duration of the refurbishment programme. Gailes SPS houses 6 off Scottish Water largest axial flow pumps. WGM provided a comprehensive safe systems of work which they adhered to a each stage of the removal and installation process. Scottish Water visited the WGM Service Centre after strip down for component parts for inspection. The pump impeller was badly worn on the geographic profile which deemed it to be unserviceable. WGM produced a new mould and casting and machined and dynamically balanced the impeller. The new impeller was manufactured for around 50% of the cost from the OEM. We have instructed WGM to carry out another refurbishment on a second foul pump.

The energy savings are being recorded by the Scottish Water Energy Department.