Building & Equipment Safety

Fuel Safety Bulletin 2005-03

October 12, 2005

Subject: CSST tubing systems

During recent site visits, inspection staff have noted problems with CSST (Corrugated Stainless Steel Tubing) tubing system installations. These problems all seem to relate directly to the manufacturers instruction manual. These systems are certified and, as such, the instruction manual is part of that certification. It must be read and followed fully by installers for the certification to be valid as it often contains many product-specific requirements that are made in addition to the B149 Code. For your information, I have compiled a partial list of problems noted as they refer to the installation instruction manual of nearly all of these systems. These items are as follows;

  1. These systems are very susceptible to any sort of impact damage. When installed outdoors, any tubing below 6 feet (2 m.) above grade level must be protected inside an encasing conduit, or installed in a location which will not subject it to mechanical damage.
  2. When installing the fittings, it is very important to not expose too much of the tubing when the outer plastic jacket is removed. Any tubing exposed must be rewrapped, or covered by a heat-shrink sleeve.
  3. Some manufacturers do not certify their fittings for outdoor installation and give very specific instructions as to how to protect any fittings installed.
  4. These tubing systems are approved for a maximum working pressure of 5 psi. The only CSST tubing system approved for more than this pressure has welded, factory installed, fittings.
  5. If installed underground, this tubing must be protected by a plastic piping sleeve, the same as copper tubing. Some system manufacturers also have a certified containment system for use with their product.
  6. All manufacturers have very specific requirements for tubing protection when running through stud spaces or enclosed walls. These requirements must be followed closely.

While this is certainly not a comprehensive installation guide, it shows how important it is to read and follow the manufacturers certified installation for the product you are using.


Dale C. Stewart
Chief Inspector, Fuel Safety


Last Updated: 2005-Oct-7
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