This standard stipulates the minimum breathing gas flow rate required to meet divers' underwater operations and the minimum amount of breathing gas required to complete diving operations. This standard applies to divers who use ventilated, surface-supplied, self-contained or ejector regenerative helium-oxygen diving equipment to breathe compressed air or artificially prepared mixed gas (nitrox, heliox or nitrox) for diving. Conventional or saturation diving operations. The design and manufacture of diving equipment and air supply equipment can be used as a reference.