The feed water pump for the hydrogen production boiler does not perform well; a single pump is not capable of meeting the design requirements. Currently, two pumps are in use. I seek expert assistance in analyzing this issue
Thread Content
The feed water pump for the hydrogen production boiler was functioning well until then, with a flow rate of around 68 tons. One day, the flow rate decreased by 3 tons; it was no longer sufficient. The maintenance team then started another pump, resulting in dual-pump operation. When the load on the plant was reduced, it was planned to shut down one of the pumps, but the flow rate with just one pump became less than 50 tons. As a result, dual-pump operation had to be resumed. No abnormal noises were detected during the operation of the pumps. I hope everyone can help analyze the reason. The water pump is an imported model that was replaced in July.
Please provide the pump’s nameplate information, such as flow rate and head, as well as the inlet and outlet pressures at the site
1. Leakage in the return pipeline. 2. The check valve at the outlet of the operating pump is not sealed properly. 3. The inlet filter is clogged (check the current consumption of the pump). 4. The check valve of the standby pump is leaking or the preheating valve is open to a large extent. 5. If it is a multi-stage pump, check whether one of the impellers is faulty
Is the outlet pressure lower than before?
1. The pipeline resistance of the outlet unit increases, resulting in a decrease in pump flow rate； 2. There are problems with the hydraulic components inside the pump, such as worn mouth rings and clogged impellers, which result in a decrease in flow rate; please conduct an inspection
Thank you all! The pump outlet pressure is lower than before
Today, the pump inlet filter was opened for inspection, and it was very clean.
The outlet pressure is low; the pump’s flow rate should increase. What’s the current situation? What was the current value when it was 68 tons, and what is it now?
I faced a similar situation a few years ago with a reconditioned boiler feed pump, which also had low pressure. Later, I checked the filters and such that were to be inspected, and no problems were found. It was lifted back for disassembly, and it was found that multiple partitions were severely eroded (multi-stage pump). It is recommended that if the original poster really can’t identify the cause, he should simply take it apart for inspection! Additionally, we look forward to your follow-up updates on the progress regarding this issue!
Okay, thank you all! The workshop is currently in contact with the manufacturer to help analyze the cause; both of these water pumps are new and have only been in use for a little over 2 months
Is the water temperature too high? Slight vaporization occurs during operation, and over time this can cause the components to be worn away