Progressive Pumps Completes Overhaul of Vertical Turbine Pump in 2 Weeks
A large company with 13 plants in 5 countries contacted Progressive Pumps about overhauling one of their vertical turbine pumps for a cooling tower at their Houston facility. The pump appeared to be in fair condition on the surface, and was running and in operation when pulled for a long-time seal leak. Once the pump was disassembled, medial blasted and inspected, we found a much different story. The bearings were heavily worn, as well as the impeller and upper shafts under the bearings. There was also heavy wear on the impeller wear rings and bowl wear ring fits, and the collets were heavily corroded. The mechanical seal, which was the preliminary cause of failure, was found in pieces with the seal faces heavily worn and unrepairable.
The complete overhaul of the vertical turbine pump included replacing the impeller shaft and pump shaft, bearings, bushings, Impeller collets, and mechanical seal. The impeller wear rings were shimmed and impellers balanced. The suction bell and impeller bowls fits and bores were verified, wear ring area machined, and new wear rings inserted. The new bearings and bushings were pressed into the suction bell and bowls. For interchangeability, we skimmed the stuffing box to accept a new cartridge mechanical seal that is used on other pumps in the plant. All the threaded holes were chased with a tap, and bolts cleaned or replaced. Pump bowls were assembled vertically, taking care to align everything properly, and then connected to the head shaft and head. Complete pump was primed and painted using epoxy and polyurethane, and shipped back to the customer. All this was completed 2 weeks after receipt of repair approval.
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