3.12
Connect the nitrogen supply (sensor-configured iL systems only)
CAUTION
Ensure that your nitrogen supply conforms to the requirements given in Section 2.
If it does not, the flow sensors may not operate correctly, the gas pipeline may
become blocked or the iL system may be damaged.
Connect your nitrogen supply to the iL system through the nitrogen inlet on the rear of the iL
system (Figure 1-4, item 4).
Use rigid metal supply pipelines (such as stainless steel). We recommend that the nitrogen
supply pipeline to the iL system has an outside diameter of
1
/
4
inch, and that the pipeline is
designed and constructed so that large pressure drops are not introduced into the nitrogen
supply.
Connect your nitrogen supply pipeline to the Swagelok connector on the nitrogen inlet on the iL
system: use the Swagelok connector as described in Section 6.2.
3.13
Leak test the system
WARNING
Leak-test the system after installation and seal any leaks found to prevent leakage of
dangerous substances out of the system and leakage of air into the system.
Note:
If you need further information on leak testing, contact your supplier or BOC Edwards for advice.
Leak-test the system after installation and seal any leaks found. Dangerous substances which
leak from the system will be dangerous to people and there may be a danger of explosion if air
leaks into the system.
The pump gearbox(es) are not isolated from the swept volume; you must therefore ensure that
the oil filler-plugs are fitted when you leak test the system, to ensure the leak-tightness of the
plugs.
Use a pump down test with helium to leak test the system. We recommend that the leak rate is
1 x 10
-5
mbar.ls
-1
(1 x 10
-3
Pa.ls
-1
) or less for the complete system, or 1 x 10
-6
mbar.ls
-1
(1 x 10
-4
Pa.ls
-1
) or less for any individual leak.
The iL system is supplied with a blanked leak-test port, as shown in Figure 3-7. To connect to this
port:
1.
Refer to Figure 3-7. Remove the
3
/
8
inch BSP blanking plug from the port (2 or 5).
2.
Fit a suitable NW25 Klein adaptor and 'O' ring and (if required) an elbow to the port, then
connect your leak test equipment to the adaptor or elbow.
iL Dry Pumping Systems
3-15
