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Manual Manifold
(e)
the manifold is supplying the hospital.
5.3.2
If the control panel is used as an ERM, close
the isolating valve slowly and check that there is no
effect on the line pressure to the hospital. Open the
isolation valve when finished.
5.3.3
Check that the manifold safety valves are not
passing, by disconnecting their downstream exhaust
coupling (Optional supply) and inspecting for a gas
leak and check the condition of the seals (See figure
9). Replace the valve or seals as necessary (see
section 6 for component replacement). Reconnect
the exhaust pipework (optional supply), ensure the
O-ring seals correctly in place.
Figure 9 - Relief Valve Maintenance
(Image shown with optional exhaust)
Note - All relief valve and optional exhaust connections are flat
face unions complete with o-ring seals for ease of removal.
5.3.4
Close one cylinder valve and disconnect the
tailpipe at the cylinder end (see figure 10). Once the
tailpipe has drained listen for a leak. A minor leak
is permissible and likely but an obvious major leak
denotes failure of the manifold non-return valve
(NRV). If the latter happens, do not totally detach
the tailpipe but instead retighten it and test other
tailpipes in the same way. Any failed NRV's can be
replaced (see section 6.7) after all cylinder valves have
been closed and the system has been depressurised.
Repeat this test when the new NRV's have been fitted
(See figure 10 and section 4.6 - Cylinder Operation).
2006230.03
2nd stage relief valve
Optional
exhaust line
1st Stage
relief valve
Figure 10 - Cylinder Connection
5.3.5
Check the line pressure regulator set point.
WARNING: This check requires
momentarily isolating the manifold from the
pipeline. Ensure it is safe to carry out this test
before proceeding.
Ensure the line valve 'A' is closed. Open Valve 'C' to
produce a steady flow and check the pressure on
the line gauge does not drop by more than 10%. If
possible attach a flowmeter to the test valve and
pipe away the exhaust gas to a safe location when
performing this test. Close valve 'C' and open valve
'A' when finished.
WARNING: For anaesthetic and oxygen
manifolds ensure that the manifold room
is well ventilated and no potential ignition
sources are present whilst performing this
test. Carry out this test for as short a time
as possible. Oxygen can be absorbed into
clothing etc., so once the test is complete it is
recommended to spend at least 20 minutes
out doors to ensure the oxygen has released.
During this time stay away from naked
flame, do not smoke etc. Do not perform this
test unless the risks can be kept within an
acceptable level.
5.3.6
Check the static pressure of the regulator
(this should be typically as per table 5 in section
4).
WARNING: This test requires
momentarily isolating the manifold from the
pipeline. Ensure it is safe to carry out this test
before proceeding.
Ensure that line valve 'A' is closed, observe the
pressure for typically 10-20 minutes to ensure
that there is no regulator creepage. Excessive
creepage will necessitate replacement of the
regulator (see section 6.3) and a repeat of this
test.
16
Bodok Seal
Typical
tailpipe with
pin index
clamp
Typical Cylinder
Valve
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