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Measurment in pump maintenance part 1
- 1. CG Industrial education PUMP MAINTENANCE Made By :Pawan Kumrawat Mechanical Engineer PART 1-IMPORTANT MEASUREMENTS
- 2. Important measurements inPump Maintenance Part 1 Index CG Industrial education Measurements for Bearings Shaft lift Check for Bearings Clearance measurement by Dial Gauge Shaft lift Check in rolling element bearing Clearance check in plain bearing Plain Bearing clearance check by Blue Matching Plain Bearing clearance check by Plastic gauge Plain Bearing clearance check by Led, Babbit Metal wire Measurements for Shaft Shaft deflection or whip measurements by dial gauge. Shaft end play measurements by Dial Gauge. Shaft eccentric(radial run out) measurements Shaft perpendicular (face run out) measurements
- 3. Bearings supports shaftsand rotor may have sustained some damage to check this, lift check is performed Procedure of checks Positioning a dial indicator on the top of the shaft as close as to get it to the inboard bearing. It is essential to anchor the indicator to a stationary object with a magnetic base or clamp. lift the shaft upward enough to detect if any motion occurs but not with so much force as to permanently deform the shaft. Place the indicators on top of the shaft or coupling hub and hold the dial indicators steady Lift upward on each shaft and note the dial indicator readings Important measurements in Pump Maintenance Part 1 Shaft lift Check for Bearings Clearance by Dial Gauge CG Industrial education
- 4. Outer Race Rolling Element InnerRace In rolling element bearing the amount of lift on the shaft should be negligible (0 to may be 1mil) excess amount of shaft lift with a rolling element bearing four possible reasons for this is as follows The inner race of the bearing is loose on the shaft There is too much clearance between the rolling elements and the inner and outer raceways of bearing The outer race is loose in its housing. A combination of two or more of the items above. For radial lift check. please lift the shaft on which bearing is mounted For axial lift check, move the shaft forward or backward Important measurements in Pump Maintenance Part 1 Shaft lift Check in rolling element bearing CG Industrial education
- 5. Upper Half Lower Half Lubricant Shaft Housing RadialClarence the amount of lift on the shaft should be within acceptable radial bearing clearance range. As per OEM Plain Bearing Clarence depends on Thermal Expansion, Equipment and Speed Plain Bearing Clearance checked by, Plastic gauge, Led or babbit metal wire, Blue match Important measurements in Pump Maintenance Part 1 Clearance check in plain bearing CG Industrial education
- 6. In babbit orled metal bearing surface of bearing may be uneven, so Clarence may be not same at all location or may be shaft touch the bearing at some location, so first A thin coat of Persian blue is applied both upper and lower half of bearing , the lower half of the bearing is installed to its lower hemisphere and the shaft is lowered onto the bearing then upper half is installed and both half tighten, then first upper half is taken out then examined to determine how much of the bluing is transferred to the shaft to insure that there is at least 80% shaft to bearing contact. We can remove or scrape high positions. After that further we can check Clarence by plastic gauge or led wire. Important measurements in Pump Maintenance Part 1 Plain Bearing clearance check by Blue Matching CG Industrial education
- 7. Plastic gaugeis highly effective for measuring the clearance in large bearings Turbine housing bearings, Pump Bearings, Plastic gauge is used for measurement of Flatness and clearance in pipe-flanges and cylinder heads Plastic gauge provides a simple and effective method for the measurement of clearance (separation) between fitted or hidden surfaces. It is particularly useful for measuring clearances in split bearings, or in situations where a feeler gauge cannot be inserted. First the Bearing upper half is removed and both shaft and bearing are cleaned, then plastic gauge is kept on shaft then upper half is again tighten and removed again, check the width of flatten plastic gauge , higher thickness low clearance, less thickness high clearance Important measurements in Pump Maintenance Part 1 Plain Bearing clearance check by Plastic gauge CG Industrial education
- 8. The shaftdeflection is measured by placing the dial indicator as close to the stuffing box face as possible and lifting the shaft at the impeller end to check the side-to-side movement. Important measurements in Pump Maintenance Part 1 Shaft deflection or whip measurements by dial gauge. CG Industrial education Radial Bearing Thrust Bearing
- 9. Endplay isthe axial or lateral (end-to- end) movement of the shaft. A dial indicator is placed against the shaft shoulder. The shaft is tapped on both ends with a soft mallet and the results are read on the dial indicator. Important measurements in Pump Maintenance Part 1 Shaft end play measurements by Dial Gauge. CG Industrial education Radial Bearing Thrust Bearing
- 10. Shaft run-outis caused by the wobble of a bent shaft. Run-out should be checked by taking readings on minimum two points on the shaft. that exist between shafts and coupling hubs, impellers or other components. First, place the dial indicator on the shaft in the area of the stuffing box face and turn the shaft. Then move the dial indicator to the coupling end of the shaft and repeat the measurement. Excessive run-out will result in bearing damage, which will cause vibration. The vibration will cause a premature seal failure. Important measurements in Pump Maintenance Part 1 Shaft eccentric(radial run out) measurements CG Industrial education Radial Bearing Thrust Bearing
- 11. If the stuffingbox face is not perpendicular to the shaft, the seal insert will not mate squarely with the rotating seal. This misalignment will cause the seal to wobble as it spins, again resulting in premature seal failure. This is measured by attaching the dial indicator to the shaft with the stuffing box bolted in place. The instrument is then placed against the face of the stuffing box and the run-out is measured as the shaft is turned. Important measurements in Pump Maintenance Part 1 Shaft perpendicular (face run out) measurements CG Industrial education Radial Bearing Thrust Bearing
- 12. This is Part– 1 of Important Measurements in Pump Maintenance in this part we learn how to measure clearance in ball or roller bearing by Dial gauge or plastic gauge or Blue in next PPT we will learn Measurement by Led Wire, Filler gauge and, Depth gauge.