Publicité
Les langues disponibles
Les langues disponibles
SAFETY INSTRUCTIONS
7. Repairs to sealed components
During repairs to sealed components, all electrical supplies shall be disconnected from
the equipment being worked upon prior to any removal of sealed 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. Particular
attention shall be paid to the following to ensure that by working on coelectrical
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, terminal
sealing materials not made to original specification, damage to seals, incorrect fitting of
glands, etc. Ensure that apparatus is mounted securely. Ensure that seals or s
have not degraded such that they no longer serve the purpose of preventing the
ingress of flammable 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 leak detection
equipment. Intrinsically safe components do not have to be isolated prior to working on
them. 8. Repair to intrinsically safe components
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 atmosphere from a leak.
9. Cabling
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.
10. Detection of flammable refrigerants
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.
10. Leak detection methods
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 also 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.
P
a
g
e
f o
26
40
Publicité
