A386-11-880 Issue E
Page 16 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
4.3 Inspect and clean the Exhaust-Silencer
Refer to Figure 1 and dismantle, inspect and clean the silencer as described below. When you maintain the Exhaust-
Silencer, use an Edwards Exhaust-Silencer service kit. This kit contain all of the seals and other components necessary
to complete maintenance operations successfully. The Item Number of the service kit is given in Section 6.
1. Remove the Exhaust-Silencer from the pump as described in Section 3.4.
2. Weigh the silencer. If the mass of the silencer is greater than 7.5 kg, dismantle, clean and reassemble the
silencer as in Steps 3 to 10 below. If the mass of the silencer is below 7.5 kg, it does not need to be cleaned;
refit the silencer as in Step 11.
3. Remove and retain the six bolts and washers (1, 2) which secure each end-cover plate (3, 12) to the silencer
body (5). Pull the end-cover plates squarely from the outlet pipe (16) to remove them.
4. Remove the three ‘O’ rings (4, 10, 11) from the silencer and discard.
5. Empty all loose deposits from the silencer body; take care not to damage the end-cover plate sealing surfaces.
6. Use a suitable tool to dislodge remaining deposits, then wash the silencer body with steam or water. Finally,
glass-bead blast the silencer body. If required, use a cleaning solution suitable for the nature of the deposits.
7. Inspect the silencer for internal corrosion and check that the wall of the silencer body is not excessively eroded.
Inspect the end-cover plate and inlet and outlet flange sealing-faces for damage and refinish if necessary. If
silencer damage is excessive, it should be replaced.
8. Check that the ‘O’ ring grooves are clean. Apply a light wipe of vacuum grease and place the new ‘O’ rings in
position.
9. Refit the end-cover plates and secure with the bolts and washers removed in Step 3. Tighten the bolts
progressively; alternate between bolts on opposite sides of the end-cover plate. Tighten to a torque of 10 Nm.
10.Leak-test the silencer.
11.Refit the Exhaust-Silencer to the pump:
For QDP, iQDP and CDP i, Ei and Si pumps, refer to Steps 6 to 9 of Section 3.5.1.
For CDP Ni pumps, refer to Steps 3 and 4 of Section 3.5.2.
Substances which accumulate in the Exhaust-Silencer may be dangerous. Do not allow these
substances to come into contact with your skin or eyes. Do not inhale vapours from these
substances.
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