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// CODE SNIPPET

A.6.4 Example 4: Modification to Existing Piping System

2015 Michigan Residential Code > A Sizing and Capacities of Gas Piping > A.6 Examples of Piping System Design and Sizing > A.6.4 Example 4: Modification to Existing Piping System
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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/ft3 (37.5 MJ/m3).

Solution:

  1. The length of pipe and CSST from the point of delivery to the retrofit appliance (barbecue) at the end of Section G is 40 feet (12192 mm), A + B + G.
  2. Use this branch length to size Section G.
  3. Assume the CSST manufacturer has tubing sizes or EHDs of 13, 18, 23 and 30.
  4. 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.
  5. 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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