What is the minimum standard for piping according to the specifications?

The minimum standard for piping according to the specifications is ASTM steel Schedule 80. This standard is essential in applications involving the transportation of compressed natural gas (CNG) because it provides a balance of sufficient wall thickness, strength, and pressure rating necessary to safely handle the high pressures associated with CNG systems.

Schedule 80 pipe has a thicker wall than both Schedule 40 and Schedule 60, enhancing its capability to resist deformation and rupture under pressure. It is designed to ensure durability and safety in environments where pressures can fluctuate significantly, making it critical for gas service piping.

Using Schedule 80 also helps to minimize the risk of leaks and failures, which can lead to safety hazards in CNG applications. Thus, the selection of Schedule 80 for the minimum piping standard underscores the importance of safety in the handling and transportation of natural gas.