Cylinder transport and storage: valve protection caps stay on and secured; hoisted cylinders ride on a cradle, slingboard or pallet and are never lifted by magnets or choker slings; cylinders are moved by tilting and rolling on their bottom edge and not dropped or struck together; on powered vehicles they are secured upright; caps are not used for lifting, bars are not used under valves or caps to free frozen cylinders, and frozen cylinders are thawed with warm (not boiling) water. Regulators come off and caps go on before a move unless the cylinder is firmly held on a carrier made for it; a cylinder truck, chain or similar steadying device keeps cylinders in use from being knocked over; valves are closed when work ends, when a cylinder is empty and whenever it is moved; and cylinders are kept upright at all times except briefly while actually being hoisted or carried. Stored oxygen is kept a minimum of 20 feet from fuel gas cylinders and combustibles, especially oil or grease, or separated by a noncombustible barrier 5 feet high or more with a fire rating of at least half an hour. Indoors, cylinders are stored in a protected, ventilated, dry place at least 20 feet from highly combustible material, in assigned places where they cannot be knocked over, damaged or tampered with, not in unventilated lockers or cupboards. Handling of compressed gases follows CGA Pamphlet P-1-1965. At the work: cylinders are kept far enough away that sparks, slag or flame cannot reach them, or fire-resistant shields are used; they cannot end up in an electrical circuit and no arc is struck on them; fuel gas cylinders stand valve end up in use, away from flame, hot metal and artificial heat; and oxygen or fuel gas cylinders are not taken into confined spaces. Cylinders are not used as rollers or supports, only the supplier mixes gases, only the owner or someone it authorizes refills, contents are used only as intended, cylinders meet DOT 49 CFR part 178 subpart C, and damaged cylinders are not used. The employer must thoroughly instruct workers in safe fuel gas use: cracking valves to clear dirt while standing aside and away from ignition sources; opening valves slowly, no more than 1 1/2 turns on fuel gas; leaving any special wrench on the stem in use (one always available for manifolded cylinders); using a regulator before torches with shutoff valves; closing the valve and bleeding the regulator before removal; and tagging and removing leaking cylinders. Manifolds are labelled with letters at least 1 inch high, placed in safe, ventilated, accessible spots and not in enclosed spaces, with non-interchangeable hose connections (no adapters), capped when idle and kept clear. Fuel gas and oxygen hoses are distinguishable, non-interchangeable and single-passage; taped parallel hose may have no more than 4 inches taped in any 12; hose is inspected at the start of each shift, hose that suffered flashback or heavy wear is tested to twice its normal pressure and never less than 300 p.s.i., couplings need rotary motion to release, hose storage boxes are ventilated, and hoses stay out of passageways, ladders and stairs. Torches are inspected at the start of each shift for leaks, tips are cleaned with proper tools, and lighting is by friction lighter or other approved device. Regulators and gauges must work properly, oxygen equipment is kept free of oil and grease, and ANSI Z49.1-1967 technical portions apply to matters not covered here.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.