Page 852 - 2018_IRC

APPENDIX A

TABLE A.5.1 (4) If a different gravity factor is applied to this example,
SCHEDULE 40 STEEL PIPE STANDARD SIZES the values in the row marked 60 feet (18 288 mm) of
INTERNAL INTERNAL Table 402.4(2) would be multiplied by the appropriate
NOMINAL SIZE DIAMETER NOMINAL SIZE DIAMETER
(inch) (inch) multiplier from Table A.2.4 and the resulting cubic
(inch) (inch)
1 / 4 0.36 1 / 2 1.610 feet per hour values would be used to size the piping.
1
3 / 8 0.493 2 2.067
TABLE A.5.2
1
1 / 2 0.62 2 / 2 2.469 COPPER TUBE STANDARD SIZES
3 / 4 0.824 3 3.068 NOMINAL OR INTERNAL
1
1.049 3 / 2 3.548 TUBE STANDARD SIZE DIAMETER
TYPE
(inches)
(inches)
1 / 4 1.380 4 4.026 K 1 / 4 0.305
1
For SI: 1 inch = 25.4 mm. L 1 / 4 0.315
A.6 Examples of piping system design and sizing. ACR (D) 3 / 0.315
8
A.6.1 Example 1: Longest length method. Determine the ACR (A) 3 / 8 0.311
required pipe size of each section and outlet of the piping sys- K 3 / 0.402
tem shown in Figure A.6.1, with a designated pressure drop 3 8
of 0.5-inch w.c. (125 Pa) using the Longest Length Method. L / 8 0.430
The gas to be used has 0.60 specific gravity and a heating ACR (D) 1 / 2 0.430
3
value of 1,000 Btu/ft (37.5 MJ/m ). ACR (A) 1 / 2 0.436
3
Solution: K 1 / 2 0.527
(1) Maximum gas demand for Outlet A: L 1 / 2 0.545
ACR (D) 5 / 8 0.545
Consumption (rating plate input) or Table 402.2 if necessary 5
------------------------------------------------------------------------------------------------------------------------------------------------- = ACR (A) / 8 0.555
Btu of gas
K 5 / 0.652
8
35,000 Btu per hour rating L 5 / 0.666
--------------------------------------------------------------- = 35 cubic feet per hour = 35 cfh 8
1,000 Btu per cubic foot ACR (D) 3 / 4 0.666
ACR (A) 3 / 0.680
Maximum gas demand for Outlet B: 4
Consumption 75,000 K 3 / 4 0.745
-------------------------------- = ---------------- = 75 cfh 3
Btu of gas 1,000 L / 4 0.785
ACR 7 / 8 0.785
Maximum gas demand for Outlet C: K 1 0.995
Consumption 35,000
-------------------------------- = ---------------- = 35 cfh L 1 1.025
Btu of gas 1,000
1
ACR 1 / 8 1.025
Maximum gas demand for Outlet D: K 1 1 / 4 1.245
Consumption 100,000 L 1 1 / 1.265
-------------------------------- = ------------------- = 100 cfh 4
Btu of gas 1,000 ACR 1 / 8 1.265
3
(2) The length of pipe from the point of delivery to the K 1 1 / 1.481
most remote outlet (A) is 60 feet (18 288 mm). This is L 1 1 / 2 1.505
the only distance used. 2
5
ACR 1 / 8 1.505
(3) Using the row marked 60 feet (18 288 mm) in Table K 2 1.959
402.4(2): L 2 1.985
3
(a) Outlet A, supplying 35 cfh (0.99 m /hr), ACR 2 / 1.985
1
requires / -inch pipe. K 2 1 / 8 2.435
1
2
3
(b) Outlet B, supplying 75 cfh (2.12 m /hr), L 2 1 / 2 2.465
3
requires / -inch pipe. 5 2
4
(c) Section 1, supplying Outlets A and B, or 110 ACR 2 / 8 2.465
cfh (3.11 m /hr), requires / -inch pipe. K 3 2.907
3
3
4
(d) Section 2, supplying Outlets C and D, or 135 L 3 2.945
1
cfh (3.82 m /hr), requires / -inch pipe. ACR 3 / 8 2.945
3
3
4
(e) Section 3, supplying Outlets A, B, C and D, or For SI: 1 inch = 25.4 mm.
3
245 cfh (6.94 m /hr), requires 1-inch pipe.
2018 INTERNATIONAL RESIDENTIAL CODE ® 827
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