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Idiomas disponibles
Idiomas disponibles
5 DETECTION OF FLAMMABLE REFRIGERANTS
Under no circumstances shall potential sources of igni-
tion 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.
6 LEAK DETECTION METHODS
The following leak detection methods are deemed accept-
able for systems containing flammable refrigerants. Elec-
tronic leak detectors shall be used to detect flammable re-
frigerants, but the sensitivity may not be adequate, or may
need recalibration. (Detection equipment shall be calibrat-
ed in a refrigerant-free area.) Ensure that the detector is
GB
not a potential source of
ignition and is suitable for the refrigerant used. Leak de-
tection 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 % max-
imum) is confirmed. Leak detection fluids are suitable for
use with most refrigerants but the use of detergents con-
taining 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/extin-
guished. 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.
7 REMOVAL AND EVACUATION
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 fol-
lowed since flammability is a consideration. The following
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