Monthly Archives: February 2015

Pump Group Commissions New Shot Blasting Facility – 20 Tonne Capacity

Late 2014 saw the commissioning of an £100,000 expansion project for Pump Group’s Belzona Coating business unit. The size of equipment being repaired by Pump Group has increased year on year, and the new shot blast cabinet recently commissioned is more than a match for the increase in shot blasting requirements. Pump Group was the UK’s first Belzona Approved Coating Centre and has strived to stay ahead of the competition in both experience, capabilities and facilities. In 2010 when Pump Group moved to a purpose built 32,000 sq ft facility the Belzona Application Room was doubled in size and now has full overhead crane access whilst maintaining a temperature and humidity controlled climate (atmosphere). The shot blast cabinet was fabricated to meet increased requirements and allow the operator to blast items up to 10m in length & 3m wide. It was designed with a mechanised bogie system which has a 20 tonne capacity. This means the operator can safely blast large impellers, casings and other components with ease. The cabinet utilises the latest sound attenuation methods which limit the environmental impact of the process and also improving the working conditions for the operator. The cabinet holds a large quantity of chilled iron grit which is blasted and recirculated by the Media Recovery Floor. This system constantly scrapes the abrasive & deposit from under grid beneath the operators feet and then filtered and recirculated automatically. This has greatly increased efficiency meaning an increase in throughput from the blasting team. Ian Pendleton of Pump Group had this to say: This investment has led to a more efficient process with a higher capacity which will be capable of meeting the ever increasing needs of our wide and varied customer base. This will allow us to pursue larger jobs requiring coating application. These brand new shotblasting facilities combined with our state of the art Coating Clean Room means that we are in a position to handle many more Belzona Coating contracts with an improved turnaround. For more information how we can utilise our extensive Belzona knowledge and Coating 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 email repairs@pumpgroup.co.uk.    

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Repair & Performance Test of a 26/24″ Vertical Split Case Pump

The 6 tonne Mather & Platt 26” / 24” Lonovane Split case pumps were removed from site after failure, and sent to Pump Group with the remit of carrying out a full overhaul and performance test. The units are used on site at a Coal Fired Power Station drawing water out of the nearby river to be filtered and then used as cooling water for the power generation process. The site normally has 4 pumps installed including one standby. Two of these pumps had both failed within a short period of time meaning that the site was close to a shutdown scenario should anything happen to either of the remaining units. On receipt at our works the units were cleaned and disassembled and the causes of failure determined. On one unit the shaft had sheared and on the other the upper thrust bearing had failed. On both units this meant the rotating element was able to drop and therefore impact and run against the lower neck ring. The seal mounting sleeves, roller bearings & intermediary make-up sleeves were all damaged beyond a repairable state. New parts were reverse engineered in-house out of Stainless Steel. The mechanical seals were also replaced with new. Several areas including the cutlass bearing holder and the bottom housing were also rebuilt with Belzona 1111 (Super Metal) which was then machined to size. Belzona Polymer 1111 is a solvent free epoxy resin reinforced with silicon steel alloy which makes it ideal for this application.This was a quicker and more cost effective alternative to completely reverse engineering the damaged areas. New shafts were machined from EN24T and the impellers were re-ringed to reduce the wear ring clearances to within tolerance. The rotating element was then built and dynamically balanced to G2.5 at 1000rpm. After assembly, the unit was hydrostatically tested to 1.5 times working pressure. The units are be run in a vertical orientation on site so to enable testing a motor stool plate was manufactured to allow one of the test stock 250 kW motors to drive the pump. A motor stand to support the weight of the motor was also fabricated and used on test. The unit was placed in our Performance Test Cell, laser aligned to one of our 250 kW motors and performance tested. The units underwent detailed vibration analysis using Pruftechnik VibExpert system and a performance test report was produced and issued to … Continue reading

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