(_f_) The apparatus must be capable of withstanding fire from
outside causes.
Sheet-metal joints must be double-seamed or riveted and thoroughly
sweated with solder. Pipes must be attached to sheet-metal with lock-nuts
or riveted flanges.
This prohibits the use of wood or of joints relying entirely upon solder.
(_g_) Gauge glasses, the breakage of which would allow the escape of
gas, must not be used.
(_h_) The use of mercury seals is prohibited.
Mercury has been found unreliable as a seal in acetylene apparatus.(_i_)
Combustible oils must not be used in connexion with the
apparatus.
(_j_) The construction must be such that liquid seals shall not
become thickened by the deposit of lime or other foreign matter.
(_k_) The apparatus must be constructed so that accidental siphoning
of water will be impossible.
(_l_) Flexible tubing, swing joints, unions, springs, mechanical
check-valves, chains, pulleys, stuffing-boxes and lead or fusible piping
must not be used on acetylene apparatus except where failure of such
parts will not vitally affect the working or safety of the machine.
Floats must not be used excepting in cases where failure will result only
in rendering the machine inoperative.
Pages:
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302