Testing for leakage – Amico Dome Loaded Manifold Nema-4 NFPA User Manual
Page 17
www.amico.com
17
Testing for Leakage
The following instructions apply for performing a leak test on the joints made during assembly and connection of the
Amico manifold.
The connections inside the Amico control cabinet have been inspected at the manufacturing plant and DO NOT require
leak testing. In order to determine whether any leaks exist between cylinder Header bar sections or at the pipeline
connections, the systems must be pressurized using either oil-free dry air or oil-free dry nitrogen.
In the case of medical Oxygen, Nitrous Oxide, or Carbon Dioxide Amico manifolds, the actual services gases ARE NOT
suitable for leak testing due to their inherent dangerous properties. Leak testing must be performed using either oil-free
dry air of oil-free dry nitrogen. In the case of either Medical Air or a Nitrogen Amico manifold, the actual service gas may
be used to perform the leak tests as follows:
•
Connect a cylinder of the manifold service gas to each side of the header bar using the proper cylinder connection
hose assemblies (pigtails) supplied.
•
Make sure all other outlets are capped with the plug and chain assemblies supplied.
•
Make sure that the high pressure inlet valves of each bank are fully OPEN.
•
“Slowly” open the two cylinder valves on each side of the cabinet, one at a time, to pressurize the header bar
and pipeline.
•
All outlets from the pipeline, downstream of the manifold, should be closed and thus there should be no fl ow
from the manifold.
•
Check for leaks at all cylinder extensions joints and at the joints where the pipes are connected to the pipeline,
using a commercial leak detector, which is compatible with oxygen.
•
If any leaks are found, the system must be depressurized by bleeding through a convenient pipeline outlet and
the faulty connections must be repaired.
•
The Header bar connections may be tightened one more turn, maintaining the horizontal location of the
cylinder adapters or a further application of an oxygen service threaded sealant may be required.
•
If the brazed pipeline connections leak, they must be removed, cleaned and then re-brazed following the
proper technique. All repaired joints must be pressure tested as previously.