20.D.07 Cylinder valves and valve caps.
- Cylinder valves must be closed when cylinders are in storage, in transit, not in use, or empty.
- Cylinder valve caps must be in place when cylinders are in storage, in transit, or whenever the regulator is not in place.
20.D.08 All compressed gas cylinders in service must be secured in substantial fixed or portable racks or hand trucks.
20.D.09 Compressed gas cylinders transported by crane, hoist, or derrick must be securely transported in cradles, nets, or skip pans, and never directly by slings, chains, or magnets, unless the cylinder manufacturer's handling instructions specifically allows for handling cylinders otherwise.
20.D.10 Compressed gas cylinders must be secured in an upright position at all times, except when being hoisted (except acetylene cylinders, which must never be laid horizontally). Horizontal storage configurations approved for transportation are permitted for cylinders other than acetylene.
20.D.11 Valve wrench or wheel must be in operating position when cylinder is in use.
- Valves must be opened slowly.
- Quick closing valves on fuel gas cylinders must not be opened more than 1 1/2 turns.
20.D.12 Cylinders must be used only for their designed purpose of containing a specific compressed gas.
20.D.13 Cylinders must be refilled only by qualified persons.
20.D.14 Cylinders must be handled in a manner that will not weaken or damage the cylinder or valve.
20.D.15 If the movement can be accomplished safely, leaking cylinders must be moved to an isolated location out of doors, the valve must be cracked and the gas must be allowed to escape slowly.
- Personnel and all sources of ignition must be kept at least 100 ft (30 m) away.
- Instrumentation should be used to assure protection of personnel from health and flammability hazards.
- The cylinder must be tagged "DEFECTIVE", after the gas has escaped.
20.D.16 Cylinders containing different gases must not be bled simultaneously in close proximity of each other.
20.D.17 Bleeding of cylinders containing toxic gases must be accomplished in accordance with environmental regulations, and in accordance with a government accepted APP and AHA specifically addressing the bleeding of compressed gas cylinders, and only under the direct supervision of qualified personnel.
20.D.18 Oxygen cylinders and fittings must be kept away from oil or grease.
- Cylinders, cylinder valves, couplings, regulators, hose, and apparatus must be kept free from oil or greasy substance and must not be handled with oily hands or gloves.
- Oxygen must not be directed at oily surfaces, greasy cloths, or within a fuel oil or other storage tank or vessel.
20.D.19 Oxygen and fuel gas pressure regulators, including their related gauges, must be in proper working order while in use.
Knowledge Check Choose the best answer for the question.
20-7. Compressed gas cylinders containing which of the following gasses may never be laid horizontal?
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