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Centrifugal pump parts maintenance standards I

Centrifugal pump shaft

1. Clean and inspect the pump shaft. Thepump shaft should be free from cracks and severe wear. If there is wear, crack,erosion, etc., it should be recorded in detail and analyzed.

2, testing

Centrifugal pump pump shaft straightness,its value should be no more than 0.05mm in the full length. The surface of thejournal shall not have defects such as pitting, groove, etc. The maximumallowable value of surface roughness is 0.8μm, and the roundness andcylindricity error of the journal shall be less than 0.02mm.

3. The parallelism error of the centerlineof the centrifugal pump keyway to the shaft centerline should be less than0.03mm/100.

Centrifugal pump impeller

1. Clean and inspect the surface of theimpeller at all levels. The surface of the impeller should be free of cracks,wear and other defects. The surface of the impeller should be smooth and freeof scale and burrs. The blades should be free from cracks, erosion andthinning.

2. Check the impeller suction port anddischarge port seal ring of each stage, there should be no looseness, thesurface of the seal ring is smooth, no burr, the maximum allowable value ofsurface roughness Ra is 0.8μm, and the clearance amount with the impellershould be 0.05~0.10 mm. Based on the inner bore of the impeller, check that theradial runout of the impeller should be no more than 0.05 mm. The end face jumpis no more than 0.04 mm.

3. The impeller and the shaft adopt aninterference fit, generally H7/h6. The interference between the key and thekeyway is 0.09~0.12 mm, and the amount of clearance at the top of thecentrifugal pump key after assembly is 0.04~0.07mm.

4. The impeller must be staticallybalanced.

Centrifugal pump head, pump casing and guideimpeller

1. Clean and inspect the impellers at alllevels, and there should be no defects such as abrasion, cracks and erosion.

2. The anti-rotation pin of the centrifugalpump impeller should be free from bending, breaking and loosening. The surfaceof the pump head and pump casing seal ring shall be free from pitting,scratches and grooves. The maximum allowable value of surface roughness Ra is0.8μm. The clearance between the seal ring and the pump head and the pumpcasing of the centrifugal pump is 0.05~0.10mm. The ring should not be loose.

3. Taking the centrifugal pump head and thecentrifugal pump casing as the reference, measure the radial circular runout ofthe inner ring of the sealing ring, the value of which is not more than 0.50mm, and the circular runout of the end face should be no more than 0.04 mm.

4. Measure the amount of clearance betweenthe pump head of the centrifugal pump, the seal ring of the pump casing and itsassembled seal ring. The value should be between 0.50 and 0.60 mm.

Centrifugal pump throttle shaft seal

1. Clean and inspect the surface of thethrottle shaft seal. There should be no defects such as cracks and partialgrinding. The maximum allowable value of surface roughness Ra is 0.8μm. 2. Thethrottle shaft seal of the centrifugal pump is matched with the pump body byH7/p6. . Based on the outer circle, measure the radial runout of the innerhole, the value should be no more than 0.02mm; 3. Measure the gap between thethrottle shaft seal and the pump shaft of the centrifugal pump, the valueshould be between 0.25~0.30 mm.

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