6.5 Check the purge gas flow rates
Use the Service/Gas valve control menu to regularly check the purge gas flow rates against
the nominal flow rates shown in Table 5-1.
6.6 Inspect and clean the exhaust-pipe, elbow and check-valve
WARNING
The substances which accumulate in the exhaust-pipe, elbow and check-valve
can be dangerous. Do not allow these substances to come into contact with
your skin or eyes. Do not inhale vapours from these substances. Fit blanking
caps to the inlet and outlet flanges when you move the exhaust-pipe, elbow or
check-valve around your workplace.
6.6.1 Dismantle, clean and refit the exhaust-pipe and elbow
Note: This requires an iH exhaust service kit (Refer to Section 8.3)
Use the following procedure to dismantle, clean and refit the exhaust-pipe and elbow. Refer
to Figure 1-1.
1. Remove the NW40 clamp and trapped 'O' ring on the outlet flange of the check-valve (18) to
disconnect the iH system from your exhaust-extraction pipeline. Dispose of the trapped
'O' ring.
2. Remove the exhaust enclosure (26) by removing the screws connecting to the rear bulkhead
cover and exhaust enclosure top plate.
3 Remove the elbow insulation jacket (23) and clamp insulation jacket (24) and retain.
4. Remove the NW40 clamp and trapped 'O' ring which secures the check-valve (18) to the
elbow (20) and remove the check-valve. Dispose of the trapped 'O' ring.
5. Remove the NW40 clamp and trapped ‘O’ ring which secures the elbow to the exhaust pipe
(19). Dispose of the trapped ‘O’ ring.
6. Inspect the exhaust-pipe (19). If you do not need to remove the exhaust-pipe from the pump
to clean it, use a suitable tool (for example a long bottle brush) and a cleaning solution
suitable for the deposits to clean the exhaust pipe and continue at Step 17. If you need to
remove the exhaust-pipe from the pump to clean it, continue at Step 7.
7 Use a hexagonal key to remove the cap screws, which secure the drip tray (27) to the iH
system. Remove and retain the drip tray.
8 Remove and retain the exhaust insulation jacket (25). Dispose of the stainless steel cable ties.
9. Undo and remove the bracket which secures the exhaust-pipe to the iH system. Retain the
bracket.
iH Dry Pumping Systems 6-5
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