7. In the use of a generator regard should be had to the danger of
stoppage of passage of the gas and resulting increase of pressure which
may arise from the freezing of the water. Where freezing may be
anticipated, steps should be taken to prevent it.
8. The apparatus should be so constructed that no lime sludge can gain
access to any pipes intended for the passage of gas or circulation of
water.
9. The use of glass gauges should be avoided as far as possible, and,
where absolutely necessary, they should be effectively protected against
breakage.
10. The air space in a generator before charging should be as small as
possible.
11. The use of copper should be avoided in such parts of the apparatus as
are liable to come in contact with acetylene.
The BRITISH ACETYLENE ASSOCIATION has drawn up the following list of
regulations which, it suggests, shall govern the construction of
generators and the installation of piping and fittings:
1. Generators shall be so constructed that, when used in accordance with
printed instructions, it shall not he possible for any undecomposed
carbide to remain in the sludge removed therefrom.
2. The limit of pressure in any part of the generator shall not exceed
that of 20 inches of water, subject to the exception that if it be shown
to the satisfaction of the Executive of the Acetylene Association that
higher pressures up to 50 inches of water are necessary in certain
generators, and are without danger, the Executive may, with the approval
of the Home Office, grant exemption for such generators, with or without
conditions.
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