Edwards CDX1000 User Manual

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Installation
A708-01-880 Issue E
3.16 Leak test the system
Leak-test the system after installation and seal any leaks found. Substances which leak from the system may be
dangerous to people and there may be a danger of explosion if air leaks into the system.
The leak rate of the pump is tested to be less than 1 x 10
-3
mbar l s
-1
(1 x 10
-1
Pa l s
-1
, 7.5 x 10
-2
Torr l s
-1
) when
supplied. The required leak rate for the system will depend on the safety and process requirements.
If required, contact the supplier or Edwards for advice.
3.17 Commission the pump
3.17.1 Commissioning procedure
1. Isolate the pump from the process system.
2. Turn on the cooling water supply and the exhaust extraction system.
3. Turn on the shaft-seals purge gas supply.
4. Check that there are no leaks in the water, gas system, and exhaust-extraction system connections. Seal any
leaks found.
5. As supplied, the TCV (Figure 1, 2 or 3, item 17) is adjusted to provide a pump case (water jacket) operating
temperature of 65 °C (149 °F), with a corresponding oil temperature (measured at point 27) of 80 °C (176 °F).
Refer to Section 3.17.2 if operating the pump at a different temperature.
6. Switch on the pump.
Note: The pump must be heated to at least +5 °C (41 °F) before starting or rotating the pump.
7. Check that the pressure shown on the shaft-seals purge pressure gauge is between 0.34 and 0.48 bar
(3.4 x 10
4
and 4.8 x 10
4
Pa, 4.9 and 6.9 psi) above the exhaust back pressure.
8. Leave the pump to operate for approximately 90 minutes to allow the pump operating temperature to stabilise.
9. Check that the pump operating temperature is correct. If necessary, adjust the TCV to change the pump
operating temperature (refer to Section 3.17.2).
10. Turn off the pump.
11. Turn off the shaft-seals purge gas supply and the cooling water supply.
3.17.2 Adjust the TCV (thermostatic control-valve)
Note: The minimum pump operating temperature of 65 °C (149 °F) stated in Table 12 is with a cooling water flow
of 10 l min
-1
(2.6 US gal min
-1
) and with a cooling water supply temperature of 20 °C (68 °F).
Refer to Table 13 and 14 for the full operating temperature range of the pump.
The TCV regulates the flow of water through the water cooling system to maintain the pump at the required operating
temperature and is adjustable between 0 (minimum) and 5 (maximum). These TCV settings correspond to the pump
operating temperatures shown in Table 12.
WARNING
Leak-test the system after installation and seal any leaks found to prevent the leakage of
dangerous substances out of the system and leakage of air into the system.

Edwards CDX1000 Specifications

General

Brand	Edwards
Model	CDX1000
Category	Water Pump
Language	English