Install the cutting gun on the fixed rubber hose joint, and check whether the oxygen meter and acetylene safety pot work normally and whether the shooting and suction force of the cutting gun is good.

When using the oxygen cylinder, the cylinder shall be placed stably and deflated, the dust and sundries at the joint shall be blown away, and then the oxygen meter shall be installed. When the air pressure in the cylinder is lower than the working pressure, it must be replaced, and the moving cylinder should avoid collision, and oil is strictly prohibited.

When using temporary acetylene generator, pay attention to:

1. The acetylene generator shall be 10 meters away from the source, more than 3 meters away from the oxygen cylinder and 1 meter away from the heating equipment. It shall not be placed on the sidewalk or under the high-voltage line.

2. Sufficient clean water shall be kept in the generator, and the water seal flashback preventer shall maintain a certain water level.

3. The amount of calcium carbide added into the generator shall be specified according to the amount added at one time, and the degree of calcium carbide shall meet the requirements, generally 50-80mm.

When using LPG, the ambient temperature shall not exceed 60oC, and the cylinder shall be more than 5m away from the fire source.

The unevenness of gas cutting steel plate shall meet the requirements. Generally, the unevenness of steel plate with thickness less than 14 mm is 2 / 1000, and that of steel plate with thickness greater than 14 mm is 1 / 1000.

Clean the site, level the workpiece, leave a gap of no less than 100 mm under the plate, and remove the rust and oil stain within 30-50 mm on both sides of the cutting seam of the workpiece.