Why is there repeated leakage in the warm pump line at the pump’s outlet?
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There are repeated leaks in the warm pump line at the pump’s outlet. The pump is of the multi-stage centrifugal type, with an inlet pressure of 0.3 MPa and an outlet pressure of around 5.8 MPa. There are 8 boiler feed pumps, one in operation and one as backup, and almost all of them have recurring leaks in the heating pump lines. All units have been rewelded. I would like to ask the more experienced colleagues: this shouldn’t be a normal phenomenon, right? Is it still normal? Thank you
Is there a orifice plate on the heat pump line? Try changing to a multi-stage flow control orifice plate
Was the pressure rating of the pipeline chosen too low?
This phenomenon is normal; use a dual-valve setup with one valve in the normally open position and the other for current limiting!
It is necessary to specify exactly which part is affected – whether it’s a leak in the pipe weld, an elbow, a straight pipe, a leakage in the flange gasket, or internal leakage in the valve – so that specific countermeasures can be devised. 1. Weld seam defects: If the welding quality is not up to standard, re-weld after thorough grinding. It is necessary to find a skilled welder; welding should be carried out in accordance with the requirements outlined in the radiography guidelines, ensuring single-sided welding with double-sided completion. Porosity and slag inclusion must be avoided, as well as cracks. The welding rod must be compatible with the main material, and the welding process should be determined by referring to relevant technical specifications. 2. Leaks in straight pipes or elbows: The material quality is poor; obtain pipes and fittings that meet the specifications for pressure pipelines from a reputable supplier and replace them. 3. Leakage at the flange gasket: Replace the gasket with one that is suitable for the system’s pressure rating; it’s also possible that the flange’s pressure rating or thickness is insufficient (not heavy enough). In such cases, replace it with a flange provided by a reputable supplier and suitable for the system’s pressure rating. 4. Internal leakage of the valve: The valve is not heavy enough or its pressure rating does not match the requirements; replace it with a valve that meets the system’s operational conditions (with an appropriate higher pressure rating and a stainless steel valve core).