This Standard is concerned with piped systems for acetylene at pressure 0 to 6.865 kPa for low pressure, and from 6.963 kPa and up for high pressure. Also it is applied to generating of acetylene and charging of acetylene cylinders either separately or in conjunction with charging other compressed gases. In case of combined operation, this standard shall apply to only acetylene generators and charging, provided these operations are confined to special rooms or areas. It does not apply to generating and charging acetylene for the purpose of welding.