Publicité
Les langues disponibles
Les langues disponibles
operating form of leak detection should be located at the most critical
point to warn of a potentially hazardous situation.
• Particular attention should 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 should 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 flammable atmospheres.
Replacement parts should 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.
3. 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 should 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.
4. Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse environmental effects. The
check should also take into account the effects of aging or continual
vibration from sources such as compressors or fans.
5. Detection of flammable refrigerants
Under no circumstances should 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) should not be used.
10
Publicité
