Multi-stage pump overhaul If conditions permit, it is best to look at the manufacturer's maintenance manual and assembly drawings to see what special places need attention. 1. Disintegration: 1. Before the demolition thrust bearing should be measured using dial indicator balance disc clearance, and make a record; 2. Multi-stage pump disassembly must make all parts marked according to the original order to avoid back loading Confusion, wrong; 3. Not easy to mark the small pieces (such as keys) can be the same level with the impeller or vane (middle) and so on together. 4. Disintegration can be intuitive to see if there are abnormal parts, such as with loose and so on. Part inspection: Centrifugal pump 1. Visually inspect the surface of each part is normal, the mating surface must be no scratches scratches, no corrosion, etc .; 2. With measuring the key to meet the site tolerances; 3. Volume impeller seal ring, the shell Seal ring, guide vane seal ring, interstage sleeve and other clearances are within the tolerance range, excessive wear and tear need to be replaced; 4. Check the bearings are intact; 5. All seals, seals are best for new ; Submersible pump three. Return: 1. The first rotor installed, re-balancing test; 2. Press the reverse order to remove the pump back to the various parts, pay attention to re-install the amount of the gap at each seal ring to ensure that Correct; 3. Assemble the balance disc before measuring the total amount of the rotor; 4. Equipped with a balance disc, measuring the rotor half of the amount of the string; Basically meet the drawings requirements. Under normal circumstances about a half of the total amount of the series is about half; 6. Tightly fasten the main bolts, pay attention to the angle; 7. In the shaft sucked a dial indicator, rotating shaft on the balance plate for playing table, Tolerance according to the requirements of the drawings, the general shall not exceed 0.06; 8. When installing thrust bearing should pay attention to adjust the balance disc gap, the balance ring before the bearing should be adjusted to adjust the disc clearance to the drawing requirements.
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