                            2026 INFORMATIVE DOCUMENT



                          CSA B149.2:25
This Informative Document provides helpful information and clariﬁcations relevant to
the code. Compliance is not mandatory.


7 Tank systems, ﬁlling plants, and reﬁll centers
7.4 Excess-ﬂow and back check valves
7.4.1.1 Common practice
Subject to Clauses 7.4.2 to 7.4.4, and 7.5.2, each tank opening utilized for propane ﬂow
shall be equipped with an excess-ﬂow valve sized for the application. Common practice
is that the excess ﬂow valve setpoint should be at least 50% larger than the maximum
ﬂow rate of the load to avoid nuisance trips.

7.4.8.1 Line ﬂow rate sizing
Any line utilized for propane ﬂow shall have a ﬂow capacity to atmosphere greater than
the design ﬂow rate of the excess-ﬂow valve protecting the line. To approximate a line’s
propane ﬂow capacity to atmosphere, the line shall have a vapour ﬂow capacity based
on CSA B149.1:25 Annex A, or a liquid ﬂow capacity based on Appendix A of the TSASK
CSA B149.1:25 Informative Document, of at least 75% of the rated capacity of the
excess ﬂow valve protecting the line.



7.19.4 Protection against vehicular traﬃc
7.19.4.4.1 Acceptable barriers
Acceptable barriers for permanent installation, other than those speciﬁed in CSA
B149.2:25 Clauses 7.19.4.1 and 7.19.4.2, include precast concrete blocks not less than
20 in (500 mm) in height, not less than 40 in (1000 mm) in length, and weighing not less
than 900 lb (410 kg) each, spaced at a maximum 54 in (1350 mm) between blocks.




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