Determine the required CSST size for Section G (retrofit
application) of the piping system shown in Figure A.6.4,
with a designated pressure drop of 0.5-inch w.c. (125 Pa)
using the branch length method. The gas to be used has 0.60
specific gravity and a heating value of 1,000 Btu/ft 3 (37.5
MJ/m3).
Solution:
The length of pipe and CSST from the point ofdelivery to the retrofit appliance (barbecue) at the end
of Section G is 40 feet (12192 mm), A + B + G.
Assume the CSST manufacturer has tubing sizes or
EHDs of 13, 18, 23 and 30.
Using the row marked 40 feet (12192 mm) in Table
402.4(15), Section G, supplying 40 cfh (1.13 m3/hr)
for the barbecue requires EHD 18 CSST.
The sizing of Sections A, B, F and E must be checked
to ensure adequate gas carrying capacity since an
appliance has been added to the piping system (see
A.6.1 for details).
FIGURE A.6.4
PIPING PLAN SHOWING A MODIFICATION
TO EXISTING PIPING SYSTEM
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