6.5 Tonne Split Case Pump Repair for Chemical Plant

Industry – Chemical Production

Two 6.5 tonne Mather & Platt 28” / 22” Split case pumps were removed from site as part of planned maintenance, to carry out a complete overhaul. All bearing, shaft diameters and housings were checked and found to be within tolerance for their respective class of fit. The white metal bearings were re-lined for re-use.

Further out from the journal diameters there were deep marks due to action from the seals and baffle plates.  We undercut the markings and rebuilt with Belzona 1131 Bearing Grade® polymer and machined to OEM specifications. Damage from Off-Axis running was present in both DE & NDE Bronze bearing shells. This was remedied by white metal lining the shells then boring to original dimensions. The top & bottom halves of the volutes were generally in good condition, but with internal surface scaling present.  The internals were grit blasted to surface profile specification SA2.5 and 2 coats of Belzona 1341 Supermetalglide® were applied. Belzona 1341 Supermetalglide® was selected as it improves pump efficiency by using hydrophobic technology to repel process fluids and reduce turbulent flow, lowering energy costs.

The units underwent seal conversions top AES Split Cartridge Seals with Silicone Carbide running faces and LabTecta® Push-Fit bearing protectors. The Stainless Steel impeller was in good condition with only superficial markings. The impeller was dynamically balanced at 1000rpm to G2.5 prior to reassembly. After assembly, the split case pump was hydrostatically tested to 1.5 times working pressure and was placed in our Performance Test Cell, laser aligned to one of our slave motors and performance tested. The units underwent detailed vibration analysis using Pruftechnik VibExpert system and a performance test report was produced and issued to the customer.

The units had been made redundant several years earlier, and had been sat dormant since then. Plant cooling water requirements changed and Pump Group were able to refurbish and modernise the pumps within the clients’ budget.  The unit was returned to site within the allowed time frame to meet customer requirements.

For more information on how we can utilise our extensive workshop and testing facilities to assist your company with your operational needs, please contact a member of our Repairs Team on   +44 (0)161 864 4678 or via repairs@pumpgroup.co.uk.