A705-61-880 Issue M
Page 20 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.10.2 Connect the shaft-seals purge air or nitrogen supply
Your compressed air or nitrogen supply pressure must comply with the requirements of Section 2.7. If it does
not, the shaft-seals purge pipeline may become over-pressurised and the shaft-seals may fail.
Note: Your compressed air or nitrogen gas supply must be clean and dry.
We recommend that you install suitable pressure control devices, a pressure gauge, and an automatically operated
isolation-valve in your compressed air or nitrogen supply configured so that:
The shaft-seals purge air or nitrogen supply is on whenever the pump is on.
If you connect a nitrogen supply, the nitrogen supply is off whenever the pump is off.
Whenever the shaft-seals purge air or nitrogen supply is on, you must maintain the pressure to the shaft-
seals as specified in Section 2.7.
Use the following procedure to connect your shaft-seals purge air or nitrogen supply; you must use a rigid metal (such
as stainless steel) pipeline with an outside diameter of ¼ inch for your air or nitrogen supply pipeline.
1. Refer to Figure 1. Remove the red blanking cap from the shaft-seals purge inlet (22).
2. Remove the ¼ inch compression nut and ferrule from the fittings kit and fit them finger-tight onto the shaft-
seals purge inlet connection (22).
3. Fit the end of your air or nitrogen supply pipeline to the shaft-seals purge inlet connection (22), then tighten the
nut to secure the pipeline in place.
3.10.3 Connect a nitrogen gas-ballast supply (optional)
Note: Ensure that the gas-ballast nitrogen supply is clean and dry.
Your nitrogen supply pipeline must terminate in a KF16 fitting, to enable you to connect it to the flow valve.
If required for your application, you can connect a non-venting (to atmosphere) nitrogen gas-ballast supply to the
pump. You must connect a non-venting (to atmosphere) nitrogen gas-ballast supply to the pump if you will pump
dangerous gases.
When you connect a nitrogen supply to the gas-ballast system, we recommend that you incorporate a suitable
pressure gauge in the nitrogen supply pipeline.
Use the following procedure to connect a nitrogen supply to the gas-ballast system:
1. Refer to Figure 5. Undo and remove the clamp (4) and the NW16 trapped ‘O’ ring (3) and remove the air
filter (2).
2. Use the clamp (4) and trapped ‘O’ ring (3) to connect your nitrogen supply pipeline to the gas-ballast flow
valve (5).
If you will pump dangerous gases, fit a suitable closed-circuit nitrogen supply to the shaft-seals
purge inlet, to prevent the escape of dangerous gases from the pump.
If you will pump dangerous gases, fit a suitable non-venting (to atmosphere) nitrogen supply to the
gas-ballast system, to prevent the escape of dangerous gases from the pump.
To Next Page
Loading...
Need help?
General
