d. Hose.
(1) Do not allow the hose to come in contact with oil or grease. These will
penetrate and deteriorate the rubber and constitute a hazard with oxygen.
(2) Always protect the hose from being walked on or run over. Avoid kinks
and tangles. Do not leave the hose where anybody can trip over it. This could
result in personal injury, damaged connections, or cylinders being knocked over.
Do not work with the hose over your shoulder, around your legs, or tied to your
waist.
(3) Protect the hose from hot slag, flying sparks, and open flames.
(4) Never force hose connections that do not fit. Do not use white lead,
oil, grease, or other pipe fitting compounds for connections on hose torch, or
other equipment. Never crimp hose to shut off gases.
(5) Examine all hose periodically for leaks by immersing hose in water
while under pressure. Do not use matches to check for leaks in the acetylene
hose,. Repair leaks by cutting hose and inserting a splice. Do not use tape for
mending. Replace hose if necessary.
(6) Make sure that the hose is securely attached to torches and regulators
before using.
(7) Do not use new or stored hose lengths without first blowing them out
with compressed air to eliminate talc or accumulated foreign matter which might
otherwise enter and clog the torch parts.
(8) Do not tape oxygen and acetylene hoses together.
7. SAFETY PRECAUTIONS FOR WELDING AND CUTTING CONTAINERS THAT HAVE HELD
COMBUSTIBLES.
a. Explosion hazards.
(1) In heating, welding, and cutting of containers which are not free of
combustible solids, liquids, vapors, dusts, and gases, severe explosions and fires
may result. Containers of this kind can be made safe by following one of the
methods described below.
WARNING:
Do not presume that a container is clean and safe until proven so by
proper tests. Do not weld in places where dust or combustible
particles are suspended in air or where explosive vapors are present.
(2) Flammable and explosive substances may be present in a container
because it previously held one of the following substances.
(a) Gasoline, light oil, or other volatile liquid that releases
potentially hazardous vapors at atmospheric pressure.
(b) An acid that reacts with metals to produce hydrogen.
(c) A nonvolatile oil or a solid that will not release hazardous vapors
at ordinary temperatures, but will release such vapors when exposed to heat.
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