Every apparatus must be fitted with a safety-valve or vent-pipe
terminating in a safe place in the open, and of adequate size.
15. Every apparatus must be provided with an efficient purifier so fitted
that it may be isolated from the rest of the plant and with due
consideration of the possible action of the purifying material upon the
metal used.
16. Mercury pressure gauges are prohibited. Liquid gauges, if used must
be double the length normally needed, and with a cock which in automatic
apparatus must be kept shut while it is in action.
17. Proper steps must always be taken to prevent the apparatus freezing.
In the absence of other precautions water-seals and pressure-gauges must
be filled with liquid having a sufficiently low freezing-point and
without action on acetylene or the containing vessel.
18. Signal devices to show the position of the gasholder bell must not be
capable of producing sparks inside the apparatus house.
19. Leaks must not be sought for with an open flame and repairs requiring
the use of a blow-pipe, &c., must only be carried out after the apparatus
has been taken to pieces or freed from gas by flooding.
20. Apparatus must only be attended to by trustworthy and responsible
adults.
Pages:
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283