When gas piping is encased in a protective sleeve, what must be done with the annular space?

When gas piping is encased in a protective sleeve, sealing the annular space is essential to prevent water entry. This is crucial because any ingress of water can lead to corrosion of the gas piping, which poses significant safety risks, including the potential for leaks and subsequent explosion hazards. By sealing the annular space, the protective sleeve provides a barrier against moisture, ensuring the longevity and integrity of the gas lines inside.

The correct approach ensures that the piping remains protected and functional in various environmental conditions, highlighting the importance of preventive measures in gas piping installations. Preventing water from entering is vital for maintaining safety standards and compliance with regulations governing gas piping systems.