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A705-40-880 Issue B

Page 48

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Maintenance

6. Remove the plug from the inlet flush port (2), use a suitable tool to inject the cleaning solution into the port

until the cleaning solution comes out of the port, then refit the plug.

7. On pumps without a torque limiter, fit a suitable steel rod (not supplied) into the hole in the coupling hub

(

Figure 15

, item 5), then turn the pump clockwise through three or four complete revolutions.

8. Repeat

Step 4

above as necessary, until the pump rotates freely.

9. If you have a pump-inlet isolation-valve, open the valve, otherwise, remove the blanking- flange from the pump-

inlet and reconnect the pump-inlet to your process system.

10. Refer to

Figure 1

. If the pump has a torque limiter and it has tripped and decoupled the pump-motor, reset the

torque limiter: refer to attached torque limiter amendment.

11. Use the four bolts to refit the coupling cover guard (14) to the pump. Tighten the bolts to a torque between 3

and 5 Nm.

12. Refit the pump-outlet (25) to your exhaust pipeline, then dispose of the deposits removed from the pump.

5.11.3

Flush a seized pump

Note:

If the pump has a torque limiter and it has decoupled the pump-motor from the pump, do not recouple the
pump-motor to the pump until you have finished this procedure. If you leave the pump-motor decoupled
from the pump, it will be easier to turn the pump by hand.

1. Refer to

Figure 1

. Remove the four bolts which secure one of the coupling cover guards (14) and remove the

guard.

2. If you have a pump-inlet isolation-valve in your system, close the valve. If you do not have a pump-inlet

isolation-valve, disconnect the pump-inlet (3) from your process system and fit a blanking-flange over the pump-
inlet.

3. Refer to

Figure 10

. Remove the plug from the inlet flush port (2).

4. Disconnect the pump-outlet (3) from your exhaust pipeline and fit a blanking-cap to the pump-outlet.

5. Slowly pour a suitable cleaning solution into the inlet flush port (2). Wait for several minutes to allow the

cleaning solution to drain into the pump.

6. Repeat

Step 5

until you can pour no more cleaning solution into the pump (see

Table 3

for the capacity of the

pump), then leave the pump for at least one hour for the cleaning solvent to fully react with the deposits in the
pump.

7. On pumps without a torque limiter, fit a suitable steel rod (not supplied) into the coupling hub (

Figure 15

, item

5), then try to turn the pump clockwise:



If you cannot turn the pump, continue at

Step 7

(to leave the pump for longer).



If you can turn the pump, continue at

Step 8

8. Place a suitable container under the pump-outlet (

Figure 10

, item 3) and remove the blanking-flange.

WARNING

Use a cleaning solution which is suitable for the process materials pumped. If you do not, there
may be a risk of explosion or pump damage.

WARNING

Ensure that you correctly refit the blanking plugs to the purge ports on the pump. Ensure that the
threads in the purge ports are clean and free from damage, and that the plug is undamaged.
Replace damaged plugs.