Reply To: We are seeing CSST used to for vibration isolation

[David]

Virginia Fuel Gas Code  section 616.1 sends the installer to NFPA 37.

NFPA 37 chapter 5 section 5.1.3 requires Approved mettalic flexible connectors shall be approved for protection against damage caused by settlement, vibration, expansion, contraction, or corrosion.Definition of approved (Acceptable to the authority having jurisdiction).

Hope this helps.