Pneumatech HTM02-01, Operation And Maintenance Manual

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Installation, Operation and Maintenance Manual
Medical Vacuum Plant Page 14
Figure 9-1; Servicing the bacterial filters – drain tap
1. Close the drain flask isolation valve (1).
2. Slacken the drain flask (2) to allow atmospheric pressure to be restored in the flask.
3. Unscrew the drain flask and dispose of the liquid safely, in accordance with local regulations.
4. Steam sterilize for 20 minutes at 32 psi at 134°C (+4°C / -0°C).
5. Screw the flask (2) onto the collar, ensuring that the O-ring is compressed to form a seal.
6. Open the drain flask isolation valve (1).
9.4.2
Renew the Filter Element
Refer to Figure 9-2.
Figure 9-2; Servicing the bacterial filters – filter element renewal
1. Open the isolation valves on the Standby filter line and allow pressure to equalise.
2. Close the isolation valves on either side of the filter to be serviced.
3. With the drain flask isolation valve open, slacken the drain valve (1) to vent the filter housing
and flask.
4. Close the drain flask isolation valve (1).
5. Unscrew the drain flask (2) and dispose of any liquid safely in accordance with local
regulations.
6. Fill the drain flask with sterilizing agent, e.g. Formalin.
7. Refit the drain flask, open the isolating valve (1) and allow vapour from the sterilizing agent to
permeate the filter housing for 24 hours.
8. Remove the drain flask (2) and vent the filter housing taking suitable precautions for Formalin
vapour.
9. Remove the filter bowl (3) exposing the interior of the vessel and the lower end of the element
(4). Take care to retain the O-ring (5).
10. Unscrew the element retaining nut and draw the element down and out.
11. Dispose of the used element, observing local regulations (bio-hazard).