High pressure boiler on pumping water flow low how to deal with?

High pressure boiler on pumping water flow low failure cause analysis:

1) According to suppress pump after the collapse of the situation analysis, high pressure boiler feed water pump in the early operation process, because the water supply piping system within impurities, cause the pump action part wear gap bigger.

      ( 2) Due to boiler feed water pump reduced with impurity enter, pump at the beginning of the run is not stable, appear more serious vibration and large noise.

      ( 3) Due to pump action part of the radial clearance and axial clearance due to wear and tear, cause serious internal leakage, pressure caused in the same mother tube, practical operation of the pump flow many smaller than design value, and much smaller than the rest of the pump, the biggest can reach 280 mh (

4) The actual flow of the pump is about 50% of the design value, and within the scope of the flow, the characteristic curve of pump itself also belong to the region, easy to cause unstable pump operation

5) Due to the same pump action part of the radial clearance, cause the loss of hydraulic pump rotor rigidity, also easy to cause unstable pump operation. So the operation of the pump before returning to factory instability is caused by these reasons.

      ( 6) According to the feed water pump back to factory after test performance curve, it can be seen that flow head ( H - Q) Curve shape is not very smooth, from small flow to mass flow, the rapid decline in a small flow area. Indicates in the water pump leakage, head down a lot. The shape of the pump performance curves of the pump when the original factory has a similar situation, and general multistage centrifugal pump performance curve. Author believes that it is associated with the structure design and hydraulic design of pump, temporarily not here for analysis.

      ( 7) Also affected by inside the pump leakage, pump efficiency has a larger decline, and small flow area decreased more.

high pressure boiler on low pumping water treatment scheme:

1, depress boiler pump overhaul and replacement parts, according to the disintegration of water pump and pump repair procedures, carefully check the parts damage, measure and record the match in size and gap, the purpose is to repair and to achieve the requirement of the pump overhaul and transformation, and ensure the performance of the pump to meet the needs of the scene more pump parallel operation.

      ( 1) Processing repair impeller sealing parts, the preparation of special shell sealing ring.

      ( 2) Repair welding guide blade to guide blade smooth level off

3) Replace vulnerable components and all type O sealing ring.

2, reconstruction of impeller

boiler on pump performance deficiency is the main reason why cannot meet the needs of the field running, through the analysis, even by the above method to repair and replacement parts, pump in the pump leakage is reduced, but also can not change the capacity and head of the pump curve shape and reach the scene operation performance requirements. In accordance with the requirements of field operation, the performance of the pump need to in the preceding performance increased by 4%, on the basis of the test 5%. To do this, you need to some modification of the impeller, by repair welding extension part of the impeller outlet and repair methods such as impeller outlet blade shape, to improve the performance of the pump. 3, rotor dynamic balance test

water pump impeller and strike down on the modified boiler parts, assemble the rotor working parts, in accordance with the requirements of pump standard balance precision grade G2, do high speed dynamic balance of 3000 r/min, the school after the whole to meet the standard requirements.

4, after transforming performance test

high-pressure boiler on pump after the innovation, in strict accordance with the specification requirements of assembly and inspection, control the radial clearance and axial adjustment size and gap and achieve satisfactory qualified product requirements. Then, according to the national pump test standard requirements to plant performance test.

To that end, J&T INDUSTRY CO.,LTD. has successfully built a solid foundation and infrastructure for submersible pump manufacturing.
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