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Paragraph 7 Pressure gauges

Original text. Later amendments are not shown.

A pressure gauge connected to a pressure pipe line shall be so constructed as not to be liable to deterioration under the action of the particular gases employed and shall be so constructed and fitted that—

(a)

in the event of failure of the pressure gauge no gas can escape into any part of the vehicle;

(b)

it is not possible owing to leakage of gas into the casing of the pressure gauge for pressure to increase therein to such extent as to be liable to cause a breakage of the glass thereof; and

(c)

in the event of failure of the pressure gauge the supply of gas to it may be readily cut off.