CSA 6.26-M97 (R2001)
Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST)
1.1.1 This standard applies to natural and propane gas piping systems using
corrugated stainless steel tubing (CSST), intended for installation in
residential or commercial buildings, and including the following
components as a minimum:
a. Corrugated stainless steel tubing (CSST);
b. Fittings for connection to the CSST; and
c. Striker plates (see Part IV, Definitions) to protect the
installed CSST from puncture threats.
Other components of piping systems covered by this standard
include gas manifolds, gas pressure regulators, manual gas
valves, quick disconnect devices and gas convenience outlets
(see 1.4, 1.5 and 1.6). If such additional components are
required to complete the piping system installation, they shall
either be provided as part of the piping system or specified in
the manufacturer's installation instructions (see 1.8-f).
1.1.2 This standard also applies to corrugated stainless steel piping systems
in which portions of the piping are exposed to the outdoors as required
to make connections to outdoor gas meters or to outdoor gas appliances,
which are attached to, mounted on or located in close proximity to the
1.1.3 This standard does not apply to CSST, whether coated or uncoated,
intended for direct burial underground (see 1.8-i).
1.1.4 This standard includes criteria to establish the suitability of
concealed mechanical tube fittings for use with concealed gas piping
(see Part IV, Definitions).
1.1.5 This standard also applies to corrugated stainless steel piping systems
which are used in conjunction with other approved fuel gas piping
1.1.6 This standard applies to piping systems rated for 5 psi (34.5 kPa) and
intended for exposure to maximum actual operating pressures (see Part
IV, Definitions) not exceeding 6.5 psi (41.4 kPa).
1.1.7 This standard applies to piping systems not exceeding a size of 2
inches (50.8 mm), based on the nominal inside diameter of the tubing.
1.1.8 This standard does not apply to gas connectors for appliances. These
connectors are covered by Standards ANSI Z21.24·CGA 6.10 and Z21.69·CSa
1.1.9 This standard does not apply to piping systems intended for use with
propane in the liquid state.
1.1.10 All references to psi throughout this standard are to be considered
gage pressure unless otherwise specified.
1.1.11 If a value for measurement as given in this standard is followed by an
equivalent value in other units, the first stated value is to be
regarded as the specification.
1.1.12 Exhibit A contains provisions that are unique to Canada.
1.1.13 Exhibit B contains provisions that are unique to the U.S.
1.1.14 Exhibit C contains a list of standards specifically referenced in this