Annex C
D - 2
b)
Check the complete gas installation soundness at least once per annum and as necessary
according to usage.
c)
All flue installations should be inspected, at least once a year, throughout their length for
integrity of attachment, both the appliance and cowl, and for perforation due to damage or
corrosion. Flues should be replaced if any sign of damage or perforation is found. It
should be ensured that the replacement is of an approved type conforming to the
recommendations of BS 5440 : Part 1. Flexible flue pipes should be manufactured of
material not less than 0.10mm thick and should be one of the following grades of stainless
steel as specified in BS 1449 : Part 2.
316Sll
316Sl3
316S31
4)
Chan�in� Gas Cylinders
The following procedure should be adopted:
316S33
317Sl2
317Sl6
320S31
320S33
a)
Extinguish any fire, flame or source of ignition (including cigarettes, pipes and pilot lights)
before changing gas cylinders.
b)
Wherever possible change gas cylinders in the open air.
c)
Ensure that the gas cylinder valve(s) is/are closed before disconnecting any empty cylinder
or before removing the plastic caps or plug on the outlet connection of the replacement
cylinder. (Note: lefthand thread).
d)
Make firm gas-tight joints. Any leaking vapour will smell. If a leak is suspected after
changing gas cylinders and opening valve, test by brushing with soapy water around the
joints. Bubbles will form if vapour is leaking.
Never use a naked flame.
e)
Ensure that the replacement gas cylinder is the correct one for the installation.
f)
Gas cylinder valves are of various designs depending on the type of cylinder and the use
for which it is intended and it is essential that the correct pressure regulator with the
correct pressure setting and capacity for the installation is used in accordance with the
manufacturers instructions.
g)
In the case of a connection on a pressure regulator of gas appliance which reliesl1pon a
sealing washer(s) to maintain a gas-tight joint, it,is essential to check that the washer is
present, is sound and is correctly positioned prior to making the connection. Where the
connection relies on a metal to metal seating or bull nose connection to obtain a gas-tight
joint it is essential that the mating surfaces are clean and undamaged. In no case should a
damaged valve or connection be used.
h)
Where connections are designed to be tightened with a spanner it is essential that a spanner
of the correct size is used and that the union is firmly tightened: hand tightness is not
sufficient. When self-sealing valves are incorporated in a gas cylinder, connections should
be made in accordance with the manufacturers instructions and tools should not be used.
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