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Can we use CSST flexible gas piping underground instead of black pipe?

Question:

Can we use corrugated stainless steel tubing (CSST) flexible gas piping underground instead of black pipe?

Answer:

The simple answer is no. The ANSI standard that regulates corrugated stainless steel tubing (CSST) prohibits its use underground. In normal applications, CSST could save time and installation labor compared to black pipes. It also has some advantages for use in seismic areas due to its flexibility. You can visit www.pmengineer.com for further information.