BOC Edwards iH Series Instruction Manual page 154

10. Use a hexagonal key to remove the four M8 cap-head screws and washers which secure the
exhaust pipe (19) to the HCDP pump, then remove the metal 'O' ring and the exhaust-pipe
from the HCDP pump. Dispose of the 'O' metal ring.
11. Empty all loose deposits from the exhaust-pipe (19), then use a suitable tool (for example, a
long bottle-brush) and a cleaning solution suitable for the deposits to clean the exhaust-pipe.
12. Check that the mating surfaces of the HCDP pump outlet and the inlet flange on the exhaust
pipe (19) are not scratched or damaged: if necessary refinish the surfaces. Refit the exhaust
pipe insulation jacket to the pipe and secure with new stainless steel cable ties (in kit). Use
Figure 6-3 as a guide.
13. Fit a new metal 'O' ring (supplied with kit) to the 'O' ring groove on the flange on the exhaust
pipe (19).
14. Use the screws and washers (retained in Step 10) to secure the flange to the HCDP pump
outlet and tighten by hand; ensure that the 'O' ring remains correctly in place.
15. Use a torque wrench to alternately and evenly tighten the four screws to a torque of 30 Nm.
16. Use the bracket assembly (removed in Step 9) to secure the exhaust pipe (19) to the iH
system.
17. Inspect the elbow (20). If you do not need to clean the elbow, continue at Step 19. If you do
need to clean the elbow, continue at Step 18.
18. Empty all loose deposits from the elbow, then use a suitable tool (for example a long brush)
and a cleaning solution suitable for the deposits to clean the elbow.
19. Fit a new NW40 trapped 'O' ring and the NW40 clamp to secure the elbow to the exhaust
pipe.
20. Refit the elbow insulation jacket and clamps insulation jacket. Use Figure 6-3 as a guide.
21. Use the cap screws and washers (retained in Step 7) to secure the drip tray (27) to the iH
system.
22. Continue at Section 6.6.2 to clean and refit the check-valve.
6-6 iH Dry Pumping Systems