Flowserve Pump 6-MFC-12

Has the pump performance decreased appreciably due to excessive wearing ring clearance?

Enter the original nominal design running clearance (in mm)

Is rotor removal and resetting of the seal required after adjusting the wearing ring gap?

Refer to mechanical seal manufacturer's User Instructions and note any specific requirements.

Select the method used for checking wearing ring clearance

Ensure bearing frame support bolts are re-tightened after adjustment

Disconnect pump-coupling halves if required

Ensure correct packing materials are used

Remove old packing and seal cage halves and clean the stuffing box

Verify correct type and size of new packing

Measure the stuffing box for proper length of packing

Cut packing slightly shorter than measured length

Insert each ring of packing separately and seat firmly

Stagger the rings at 90° to 180° angles apart

6.7.3 Bearing installation and removal

Ensure proper fit is maintained during bearing installation

Was a pulling device used to remove bearings from the shaft?

Support the bearing cone with a split ring and press the shaft out using an arbor press

Methods for mounting a bearing on the pump shaft

Heat the bearing to a uniform temperature of 120 °C (250 °F)

Quickly mount the heated bearing on the shaft

Apply force using an arbor press if alternate method is used

Ensure the cone is never cocked when forcing a bearing onto a shaft

Remove rotor and reset seal if necessary for pumps with mechanical seals.

Is the desired ring gap achievable with current shim pack?

Restore or replace wearing surfaces if necessary.

Loosen the 4 screws (or nuts) between the bearing frame and the stuffing box head.

Break the shim joint by tightening the two adjusting bolts and remove the shims.

Adjust shim pack thickness to achieve desired wearing gap.

Select shim stock colour code for adjustment.

5.8.2 Pumps fitted with packed gland

Is there visible leakage from the gland?

Ensure gland nuts are initially finger-tight only.

Is leakage taking place soon after the stuffing box is pressurized?

Adjust the gland evenly to ensure visible leakage and concentric alignment of the gland ring.

Is the gland packing overheating?

If necessary, slacken the gland nuts to achieve leakage.

Run the pump for 30 minutes with steady leakage.