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Page 39
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Maintenance
A705-40-880 Issue B
5.6
Inspect the pipelines and connections
1. Inspect all cooling-water pipelines and connections; check that they are not corroded or damaged. Replace any
of the pipelines and connections that are corroded or damaged. Check that all cooling-water connections are
secure. Tighten any connections that are loose.
2. Inspect all nitrogen supply pipelines and connections; check that they are not corroded or damaged. Replace any
pipelines and connections that are corroded or damaged. Check that all nitrogen supply connections are secure.
Tighten any connections that are loose.
3. Inspect all electrical cables; check that they are not damaged and have not overheated. Replace any cables that
are damaged or have overheated. Check that all electrical connections are secure. Tighten any connections that
are loose.
4. Inspect all process and exhaust pipelines; check that they are not corroded or damaged. Replace any pipelines
that are corroded or damaged. Check that all process and exhaust connections are secure. Tighten any
connections that are loose.
5.7
Inspect the pressure relief valve and replace the hinge bushes,
flap and O-ring (if necessary): EDP250 and EDP400 only
If you think that the pressure relief valve does not operate correctly, use the procedures in the following sections to
remove, inspect and refit the valve.
5.7.1
Remove the valve from the pump
1. Refer to
. Remove the four M8 bolts (11) which secure the retainer (9) to the exhaust manifold (3).
2. Fit two of the bolts (11) into the jacking holes (10) and tighten the bolts to remove the retainer (9) from the
exhaust manifold (3).
3. Remove the valve flap (7) and the valve body (2) assembly from the exhaust manifold (3).
5.7.2
Clean and inspect the valve
. Inspect the valve body (2) and pay special attention to the O-ring grooves. If the valve body or
the ‘O’ ring grooves are corroded, visibly damaged or if there are scratches on the O-ring grooves you must
replace the pressure relief valve.
2. Inspect the valve retainer (
, item 9). If the retainer or the O-ring grooves are corroded, visibly damaged
or if there are scratches on the O-ring grooves you must replace the pressure relief valve.
3. Refer to
. Clean the inside of the exhaust manifold (3) to remove any deposits; if necessary, use a
suitable cleaning solution. If you use a cleaning solution, ensure that all of the solution is removed before you fit
the new pressure relief valve components.
4. Refer to
. Inspect the valve flap (7), the hinge bushes (1) and the valve O-ring (6). If any of these items
are damaged, you must replace them.
5. Inspect the O-rings (8, 5, 4) and, replace them if necessary.
WARNING
If the EDP pump is part of an ATEX system, you must inspect the pressure relief valve in accordance
with the following procedure, and replace any components that are damaged, corroded, or do not
meet the inspection criteria.
