Where welding, cutting or soldering emits harmful fumes the employer provides ventilation that removes them at source to keep contaminants within permissible levels; hot work is prohibited near combustible material or flammable dusts, gases and vapours unless adequate precautions are taken; non-flammable tables and jigs are provided; overhead work is done so slag and sparks cannot fall on people or combustibles, with fire retardant blankets over gratings; screens at least 1,800 mm high protect other people and enclosure walls are painted flat black or dark grey; fire extinguishing equipment in working order is at hand; welders wear fire retardant clothing and the other protection of section 37.9 and respirators where air sampling shows the need; torches with their fittings and regulators are checked before use and repaired only as permitted; no hot work is done on a totally enclosed container or on a container or pipe that held explosive or flammable substances unless the employer certifies in writing to the officer that it is safe or it has been cleansed by steam or other method and drained, cleaned and ventilated as section 37.15 prescribes; torches are not laid down until gases are shut off; cylinders are used under the Fire Prevention Act, flammable gas cylinders are stored apart from hot work areas and oxygen unless separated by a rated partition, cylinders are kept upright, secured, not heated to hasten emptying, with empties stored in a designated area and removed from buildings under construction, holders allow rapid removal in a fire, and reverse flow check valves are fitted close to regulators.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.