Eight Points For Checking The Damage Of The Centrifugal Pump Coupling

Nov 05, 2024

Based on the experience accumulated from the analysis of damage cases of couplings and bearings, especially gear couplings, it is required that when a new machine is delivered for trial operation, if possible, its couplings should be inspected after the machine reaches operating temperature.

If a unit does not run smoothly after its first operation or restart, the first step in finding the cause of the problem is to check the coupling. Careful and meticulous inspection (with proper records) can ensure the safe operation of the coupling and machine, and provide accurate and reliable basis for the quality assessment and rejection standards of the coupling components.

The inspection includes: whether there is vibration (size) of the coupling, and whether there is any noise; Whether the temperature is normal or not, whether there is deformation (bending, twisting), cracks, wear, rust, discoloration (overheating), lubrication condition (lubricating oil grade, oil quantity, oil pressure, oil temperature, quality), whether the coupling parts are loose; alignment condition, etc. These inspection contents must be carried out dynamically or statically. In addition to visual inspection, some must be further detected by instruments.

During parking repairs, check the following items on the coupling:
1. Conduct visual and acoustic inspections on the coupling flange and shaft sleeve of the hot sleeve.

2. Check for deformation (bending, twisting, rusting, etc.) of the coupling device

3. Measure the length of the connecting bolt after disassembly to determine if it can continue to be used.

4. Check the lubrication condition (oil, grease quantity, quality, sealing, etc.).

5. Check the meshing condition of the gears.

6. Check the wear of the elastic components.

7. Check whether there are traces of current passing through and micro friction corrosion on the bonding surface.

8. Check the alignment of the coupling.