What should all pressure gauges read before beginning to disassemble oxyfuel equipment?

Before disassembling oxyfuel equipment, all pressure gauges should read zero. This is crucial for safety reasons, as any residual pressure could lead to potentially hazardous situations, including the risk of gas leaks, uncontrolled reactions, or explosions. Ensuring that the pressure gauges indicate a zero reading confirms that the system is depressurized and safe to work on.

In the context of oxyfuel equipment, residual pressure in hoses or equipment can cause the accidental release of flammable gases. Therefore, achieving a zero reading on the pressure gauges is a necessary step in the procedure to minimize risks associated with handling pressurized systems. This standard practice helps ensure the safety of the technician and prevents accidents that could arise from inadvertently working on pressurized equipment.