Monthly Archives: December 2013

Nuclear Power Main Cooling Water Valves Get The BELZONA® Treatment

Industry – UK Nuclear Power Generation A nuclear power station producing 1000 MW requires in the region of 150,000 m3 of cooling water per hour when active. The flow is regulated by the Main Cooling Water (MCW) Valves, which throttle the supply. As a result of this duty, the valves can be damaged by the effects of the constant water flow & cavitation. The client had removed 4 of these 66” MCW valves and sent them to Pump Group for refurbishment. The butterfly valves had previously been coated by others, and it was clear to see that there was extensive damage to the valve. Pump Group had previously used Belzona® 2141 Anti-Cavitation polymer to coat the pipes immediately downstream of the valve; as the client was happy with the performance of the Belzona they elected to use it on the valves. On arrival the valves were disassembled and inspected fully. The pressure side of the valve was worn but in reasonable condition, however the downstream side had suffered major cavitation damage. The existing coating had worn away completely near the leading edge, allowing substantial damage to occur to the metal due to the Corrosion – Erosion cycle. The existing coating was fully removed in our workshop then the base metal was hot chemical washed prior to being grit blasted. Once the surface profile was grit blasted to surface preparation specification SA 2.5 (75 micron surface profile), the metal was then tested to ensure salts and nitrates present were less than 3ppm concentration. This is to ensure that the Belzona polymer bonds correctly to the substrate correctly. Belzona® 1111 Super Metal was used to rebuild the severely worn areas to the original profile. On the upstream side, 4 x 250 micron coats of Belzona® 1321 Super Metal were applied. This side of the valve doesn’t have to be protected from cavitation, so a coating was selected to increase efficiency, whilst still offering long lasting protection against erosion/corrosion from the sea water. Another advantage of 1321 is that it has very high compressive strength, making it ideal for use on the upstream side of the valve. On the non-pressure side, 3 x 1000 micron coats of Belzona® 2141 ACR-Fluid Elastomer coating were used. The high elasticity of this polymer is perfect for combatting cavitation; nullifying the damaging effects from the shockwaves created by the collapsing bubbles. In addition to the Belzona coatings, … Continue reading

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Lowara Booster Set – New Sales

Industry – Food Production One of our external sales team attended a food production site at the request of the client to investigate their boiler feed system pumps. Our engineer identified that the horizontal multistage pump was oversized for the requirements of the boiler, causing system problems, high operating costs and consequently consuming too much power. Our engineer calculated that the needs of the system would be best met by installing an intelligent booster set which could alter performance as and when needed to minimise energy usage. PSRG specified a booster set containing 4 off 5.5kW Lowara SV vertical multistage pumps with variable speed drives and pressure vessels. The booster set is driven by an intelligent control system which utilises various pressure transducers to determine the number of pumps that are running, and at what speed they are running at. This means that the necessary pressure is always maintained, but energy isn’t wasted due to excess pumping. The system has been specified so that annual need of the boiler can be met by 3 of the 4 pumps running for 100 hours. The system was installed and commissioned by our own team of Site Engineers out of production hours. Given a calculated cost saving of over £3,200 per year, the new installation will have a payback period of less than 5 years – including installation and commissioning costs. If you have any requirements for any new pumps or parts, please contact our Sales Team on 0161 864 4678 or via

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