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Medical Gas Supply System
leak from the pigtails. 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 pigtails but instead retighten it
and test other pigtails in the same way. Any failed NRV's
can be replaced after all cylinder valves have been closed
and the system has been depressurized. Repeat this test
when the new NRV's have been fitted.
5.4.8
To simulate the "reserve low" fault. Disconnect
one of the wires to the "Reserve Manifold Fault". Observe
that the alarm fault becomes active. Reconnect the wire
and observe the fault returns to normal. See Section 4.2
to bring the manifold back on line.
5.5
Yearly.
5.5.1
Visually inspect each pigtails for cleanliness and
pipe damage. Don't use and immediately replace dirty or
damaged pigtails.
5.5.2
Check leaks at the connections of cylinder to
pigtails using oxygen compatible leak detector solution.
5.5.3
Verify the operation of manifold changeover
system using Performance Verification Procedure. Refer
to Section 3.4.
5.5.4
Calibrate the gauge and relief valve refer to the
local law.
5.5.5
Check the power supply. Refer Electrical Details
on Page 4.
5.5.6
Replace the pigtails, see Table 10.
CAUTION! Before exhausting anaesthetic and
oxygen gas from the manifolds during these inspections,
ensure that the manifold room is well ventilated and no
potential ignition sources are present. Oxygen can be
absorbed into clothing etc., so once the test is complete
it would be recommended to spend at least 20 minutes
outdoors to ensure any potential oxygen absorbed into
clothing has released. During this time stay away from
naked flame, do not smoke etc. Do not perform these
test unless the risks can be kept within an acceptable
level.
Figure 31 - Relief Valve Inspection
Line Relief
Valve
Exhaust
Connection
Intermediate
NOTE - Step 5.3.5 and 5.4.5 is only for manifold
changeover system that are used as emergency backup.
NOTE - If any parts are identified as faulty, see section 6
for replacement procedures.
37
Relief Valve
4109992459.00
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