Brochure

Gastite Division, Titeflex Corporation
1116 Vaughn Parkway / Portland, TN 37148
800.662.0208 / www.gastite.com / [e-mail]
68
April 2015
Section 4: Installation Practices
4.9 Underground Installations
a) FlashShield™ CSST shall not be buried directly in the ground or directly embedded in concrete (e.g. slab on grade
construction, patio slabs, foundations and walkways). When it is necessary to bury or embed FlashShield™ CSST, the
tubing shall be routed inside a non-metallic, watertight conduit that has an inside diameter at least 1/2 inch larger than
the O.D. of the tubing (Fig. 4-92). For ends of the conduit installed outdoors, the conduit shall be sealed at any exposed
end to prevent water from entering.
b) Venting of the conduit has typically been required because the use of conventional materials such as rigid pipe has usually
resulted in some form of connection or union within the conduit. Unlike rigid pipe however, FlashShield™ CSST is
continuous with only one fitting at each end of the run, and no fittings inside the conduit. As a result, the possibility
of gas build-up due to fitting leaks has been eliminated. erefore, Gastite Division does not require the sleeving to be
vented to the outside of the structure.
If, however, venting is still required, Figure 4-93 below depicts gas piping installed within plastic sleeving that is vented to
the outdoors. Other possible venting routes, such as the attic and roof, may also be considered but must be reviewed with
the local administrative authority, and must prevent the entry of water and foreign objects.
For ends of FlashShield™ CSST exiting the plastic sleeving, a termination fitting (XR3TRM-SIZE-NF) threaded into an
end “plug”, can be used to provide a stable platform for attachment (Fig. 4-94).
Fig. 4-92 Fig. 4-93
Fig. 4-94