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.