An important feature of underwater welding and cutting safety work is that there are a large number of and multi-faceted preparations, which generally include the following aspects: (1) Investigate the environmental conditions such as meteorology, water depth, water temperature and flow rate in the operation area. When the wind power of the water surface is less than 6 and the flow velocity of the working point is less than 0. 1 ^} 0. 3m/s, the work can be performed. (3) Before dive, in the water, the welding, cutting equipment and tools, diving equipment, gas supply pipes and cables, communication tools, etc., insulation, watertight, process performance inspection tests. The oxygen hose should be cleaned with 1.5 or 5 times working pressure of steam or hot water. The inside and outside of the hose should not adhere to grease. The trachea and cable should be bundled firmly at .5m to avoid entanglement. After entering the underwater dive, the air supply pipe, cable and signal rope should be arranged in time to keep it in a safe position to avoid damage. (4) Do not perform other operations at the same time above the working point in the area where the radius is equivalent to the water depth. Due to unburned gas or toxic gas escaping and floating up to the surface during underwater operation, personnel on the water should have fire prevention measures, and the air supply pump should be placed in the upwind to prevent fire or underwater personnel from inhaling toxic gases. Poisoned. (5) Before the operation, the operator should safely handle the work site and remove the surrounding obstacles. Underwater welding shall not be suspended in the water. The operating platform shall be installed in advance, or a safe operating position shall be selected on the object to avoid causing itself, diving equipment, gas supply pipes and cables to be within the slag splash or flow range. (6) There must be a communication device between the submersible welding and cutting personnel and the surface support personnel. When all the preparations are ready, the welding and cutting personnel can start the operation after obtaining the support personnel's consent. (7) Underwater welding and cutting work must be carried out by personnel who have been specially trained and hold such work permits. Concerned about surprises Tag: Underwater welding, welding, gas supply, inspection test, diving equipment Previous: Three major aspects of valve enterprise purchasers consider purchasing Next: What are the reasons for hydraulic cylinders?
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(2) Before the underwater welding, the nature and structural characteristics of the welded and cut parts should be ascertained, and whether there are flammable, explosive and toxic substances in the working objects. It is necessary to properly fix objects that may fall or collapse, especially when cutting underwater, to prevent bruising or damage to the air supply pipe and cable. 
What are the safety measures for underwater welding and cutting?