Implementation
Following the initial inspection of both pumps, a full overhaul was conducted on the JSH 200 pump which included the replacement of the balance disc, plate, impellers and bearings shaft, as well as the repair of mechanical seals and the manufacture of new rings and bushes. This was all reverse engineered using a Hexagon laser scanner, accurate to within thousands of a mm. The pump was pressure tested to 200 bar and a performance test was carried out providing a test curve.
Overhaul
Houghton International engineers also performed an overhaul of the KSH 200 pump and redesigned the balance disc, plate and balance sleeve from a three piece to a two piece to improve its efficiency. This type of multi stage pump produces an axial movement towards the suction end of the pump and the balance disc and plate counter this thrust. Modifying the pump’s balance disc and balance sleeve to one combined disc reduces the likelihood of wear to the balance sleeve, which would result in an increased balance flow.
Outcome
Using in-house CAD design expertise, Houghton International produced drawings and patterns to manufacture the redesigned components of the pump utilising a hard wearing cast material to increase longevity. Choosing to repair rather than replace the pumps not only reduced the cost to the customer but also meant engineering improvements could be made, upgrading the performance of the pump. Both pumps were fully overhauled, tested and returned to the customer.
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