WELDING, CUTTING, AND BRAZING

Piping Protective Equipment

• Backflow of oxygen into the fuel-gas supply system
• Passage of a flash back into the fuel-gas supply system
• Excessive back pressure of oxygen in the fuel-gas supply system.

The three functions of the protective equipment may be combined in one device or may be provided by separate devices.

The protective equipment in fuel-gas piping systems shall be located either at the main supply line, at the head of each branch line, or at each location where fuel-gas is withdrawn. Protective equipment placed at the main supply provides the best protection. Go to the next page to see a visual comparison of the three locations for safety devices.