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Sogo SS-1287 Manual

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CABLING
REPAIRS TO SEALED COMPONENTS
DETECTION OF FLAMMABLE
REFRIGERANTS
LEAK DETECTION METHODS
REMOVAL AND EVACUATION
REPAIR TO INTRINSICALLY SAFE
COMPONENTS
1) During repairs to sealed components, all
electrical supplies shall be disconnected from
the equipment being worked upon prior to any
removal of sealed covers, etc. If it isabsolutely
necessary to have an electrical supply to
equipment during servicing, then a permanently
operating form of leak detection shall be located at
the most critical point to warn of a
potentially hazardous situation.
2) Particular attention shall be paid to the following
to ensure that by working on electrical
components, the casing is not altered in such a
way that the level of protection is affected
This shall include damage to cables, excessive
number of connections, terminals not made to
original specification, damage to seals, incorrect
fitting of glands, etc
Ensure that apparatus is mounted securely.
Ensure that seals or sealing materials have not
degraded such that they no longer serve the
purpose of preventing the ingress of flammabl
atmospheres. Replacement parts shall be in
accordance with the manufacturer’s specifications
NOTE: The use of silicon sealant may inhibit the
effectiveness of some types of lea
detection equipment. Intrinsically safe components
do not have to be isolated prior to working
on them.
Do not apply any permanent inductive or
capacitance loads to the circuit without ensuring
that this will not exceed the permissible voltage
and current permitted for the equipment
in use.
Intrinsically safe components are the only types
that can be worked on while live in the
presence of a flammable atmosphere. The test
apparatus shall be at the correct rating.
Replace components only with parts specified by
the manufacturer. Other parts may
result in the ignition of refrigerant in the atmosphere
from a leak.
Check that cabling will not be subject to wear,
corrosion, excessive pressure, vibration,
sharp edges or any other adverse environmental
effects. The check shall also take into
account the effects of aging or continual vibration
from sources such as compressors or fans.
Under no circumstances shall potential sources of
ignition be used in the searching for or
detection of refrigerant leaks. A halide torch (or any
other detector using a naked flame
shall not be used.
The following leak detection methods are deemed
acceptable for systems containing
flammable refrigerants
Electronic leak detectors shall be used to detect
flammable refrigerants, but the sensitivity may
not be adequate, or may need re-calibration.
(Detection equipment shall be calibrated in a
refrigerant-free area.) Ensure that the detector is
not a potential source of ignition and is suitable
for the refrigerant used. Leak detection equipment
shall be set at a percentage of the LFL of the
refrigerant and shall be calibrated to the refrigerant
employed and the appropriate percentage of gas
(25 % maximum) is confirmed
Leak detection fluids are suitable for use with
most refrigerants but the use of detergents
containing chlorine shall be avoided as the
chlorine may react with the refrigerant and corrode
the copper pipe-work.
If a leak is suspected, all naked flames shall be
removed/ extinguished.
If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered
from the system, or isolated (by means of shut
off valves) in a part of the system remote from the
leak. Oxygen free nitrogen (OFN) shall then be
purged through the system both before and during
the brazing process.
When breaking into the refrigerant circuit to make
repairs – or for any other purpose – conventional
procedures shall be used. However, it is important
that best practice is followed since flammability is
a consideration. The following procedure shall be
adhered to:
• Remove refrigerant;
• Purge the circuit with inert gas;
• Evacuate;
• Purge again with inert gas;
• Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the
correct recovery cylinders. The system shall be
“flushed” with OFN to render the unit safe. This
process may need to be repeated several times.
Compressed air or oxygen shall not be used for
this task.
Flushing shall be achieved by breaking the vacuum
in the system with OFN and continuing to fill until
the working pressure is achieved, then venting to
atmosphere, and finally pulling down to a vacuum.
This process shall be repeated until no refrigerant
is within the system. When the final OFN charge
is used, the system shall be vented down to
atmospheric pressure to enable work to take
place. This operation is absolutely vital if brazing
operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not
close to any ignition sources and there
is ventilation available.
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