CCST is a flexible, stainless steel pipe used to supply natural gas and propane in residential, commercial and industrial structures. Coated with a yellow, or in some cases, a black exterior plastic coating, CSST is usually routed beneath, through, and alongside floor joists in your basement, inside interior wall cavities, and on top of ceiling joists in attic spaces.
While this type of pipe is safe, it is strongly recommended that you determine if the CSST system is properly bonded and grounded. A bonding device should be installed on your natural gas system in order to reduce the chances of a natural gas leak or fire. Bonding is provided primarily to prevent a possible electric shock to people who come in contact with the gas piping and other metal objects connected to the grounding system. Nearby lightning strikes can also result in an electrical surge and can potentially puncture a hole in the CSST. Proper bonding and grounding will reduce the risk of damage and fire from a lightning strike.
If you are unsure as to whether your business has CSST or whether it has been properly bonded and grounded, contact a licensed electrician to arrange for a professional inspection.
Key inspection requirements and frequencies include:
- Professional Inspection: Recommended annually or semi-annually to check for leaks, corrosion, and proper bonding, particularly in homes or buildings built between the late 1990s and early 2010s.
- Visual Check (Homeowner): Every 3 months for signs of damage, such as cracks, loose fittings, or dents.
- Support Inspection: Supports should be checked to ensure they are not sagging or crimping the tubing. Generally, CSST should be supported every 6 feet.
- Post-Lightning Strike: Any home with CSST should be inspected immediately after a nearby lightning strike to ensure the integrity of the pipe.
Critical Safety Requirement
The most critical aspect of a CSST inspection is verifying that it is properly bonded to the home’s electrical system, which reduces the risk of fire from lightning strikes. If the yellow CSST is not properly bonded, it should be evaluated by a licensed electrician immediately.