Slurry Pump Impeller Clearance Adjustment

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The following procedure describes a typical impeller clearance adjustment for a slurry pump.

The flexibility inherent in centrifugal slurry pump design does allow other settings as may be desired to optimize specific operating conditions. Slurry Pumps with recessed impellers do not rely on close running clearances with the liner. In such cases the impeller is normally adjusted back to keep shaft seal pressure at a minimum.

1. Loosen CLAMP BOLTS (012) on Side 'B' only, except on 8/6 AH or larger pumps, when such are fitted with mechanical seals. In this case loosen only the clamp bolt furthest from the slurry pump shaft end. This will ensure the bearing assembly will not lift up on one end, resulting in possible damage to the mechanical seal faces. A maximum .010" rise at the bearing assembly drive end is allowed.

2. Rotate the shaft clockwise by hand and move the bearing assembly forward (toward cover plate) by tightening the rear nut on ADJUSTING SCREW (001) until the impeller starts to rub on the front liner.

3. Release the nut just tightened by 1/3 turn (2 flats), then move the bearing assembly back by means of the front nut until the housing lug is secure against the rear nut.

4. Tighten CLAMP BOLTS (012) on side &#;B&#; . Bolts on side &#;A&#; were tightened earlier.

5. Tighten both adjustment screw nuts against housing lug.

6. Rotate the shaft and, if rubbing occurs, adjust the impeller back in the casing until the rubbing stops. NOTE If the process fluid could cause expansion due to heat or swelling (in the case of a rubber lined pump), provide for additional clearance in the adjustment procedure to allow for these conditions. On pumps fitted with a centrifugal shaft seal, forward impeller adjustment may increase seal area pressure. Thus on some applications it may be necessary to operate the slurry pump with a slightly greater impeller clearance to ensure proper shaft sealing is achieved.

CAUTION ! 

Operation of a slurry pump with the impeller rubbing against the liner may cause severe damage to the pump. Proper operating clearance must be checked prior to operating the slurry pump.

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Impeller Clearance Adjustment For Slurry Pumps

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Impeller Clearance Adjustment For Slurry Pumps

The following procedure describes impeller clearance adjustment for slurry pumps with gland packing seal.

1, Stop the pump, loosen clamp bolt of bearing housing.

Loosening bearing assembly may damage the mechanical seal, so when slurry pump are fitted with mechanical seals, loosen only the clamp bolt near to the impeller.

The rise at bearing assembly drive end should be less than 0.25mm.

2, Rotate the shaft according to direction of rotation by hand and move the bearing assembly forward by tightening the adjusting screw until the impeller rubs on the front liner.

3, Release the nut that is just tightened by 1/3 turn, then move the bearing assembly back by tightening the front nut on the adjusting screw.

4, Tighten clamp bolts and adjusting screw nuts to secure the bearing assembly in position.

5, Ensure that the impeller does not contact with the front liner as rotating the shaft. If contact occurs, repeat step 3 and 4.

Note: After each impeller adjustment is completed, the bearing housing clamp bolts and adjusting screw nuts must be tightened.

With centrifugal expeller seal assembly fitted, the slurry pump impeller forward adjustment may increase shaft seal pressure, if leakage occurs, the impeller should be adjusted backward to solve the leakage.

Leakage may be solved by changing a different impeller which have improved expelling vanes on the back and front shrouds.

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The impeller clearance adjustment is an important factor in maximizing wear life of both impeller and liners. Experience has shown that an increase in wear life of up to 20 &#; 50 percent can be achieved by regular slurry pump impeller adjustment, compared with slurry pump no adjustment of impeller clearance over its operating life.

Both rubber and metal lined slurry pumps with gland packing seal should drive impeller having minimum axial clearance with throat bush or cover plate liner, this is the most important thing while using high efficiency impellers.