Boiler Feed Pumps
1. Cartridge Design for easy maintainability
The existing design of inside stator assemble comprises of the rotor and stator parts. To complete the pump assembly using this inside stator, it involves extensive work of assembling the balance components like HP cover, LP cover, Mechanical seals, Bearing housings, Journal and thrust bearings and accurate centering of the Rotor which is a skilled and time consuming job, taking about 6 to 8 shifts for the re-assemble at site.
The upgraded design cartridge assembly comprises of almost all the parts of the pump, except for the outer barrel. This is offered in a fully centered and balanced condition ready for insertion into the existing pump barrel at site. This job can be easily carried out at site even by semi skilled work force within a short period of maximum two shifts, thereby increasing the availability of the pumps.
2. Higher efficiency for lower energy consumption costs
Upgraded design cartridge assembly fitted with high-efficiency hydraulic components result in lower power consumption by the pump, thereby saving valuable energy resource and cutting down operational costs.
3. Balance Drum design for increased reliability of operation
The present design pump internals are with balance disc arrangement, which works with an axial gap for hydraulic balance of axial thrust, which has an inherent risk of seizure during initial start and transient operating conditions. The upgraded design cartridge is provided with balance drum design arrangement, which works on a radial gap between rotating and stationary components, elimination the risk of seizure, thereby increasing the reliability of operation for all operating conditions.
4. Hydraulic stud tensioning for lower assembly time
The present design for tightening
of discharge cover bolts is through expansion using electrical bolt heating
elements and manual tightening, which is a time consuming and ineffective
practice. The upgraded design cartridge is provided with a hydraulic stud
tensioner for more accurate control of the tightening torque values and
reduction in assemble time.
Benefits of the upgraded cartridge design vis-a-vis existing inside stator design