10-3-8: PIPING INSTALLATION STANDARDS:

   A.   General Requirements And Restrictions: No pipe smaller than standard three-eighths inch (3/8") size shall be used in any concealed gas piping installation; and no pipe smaller than standard one-half inch (1/2") size shall be used for concealed horizontal piping. All gas heating appliances shall be vented to the atmosphere with the size vent connection supplied by the manufacturer. When no chimney is available, it is permissible to vent with metal pipe; provided, however, that at least one-half inch (1/2") air space may be provided between the shield and the woodwork through which the pipe passes. In no case will a rubber hose connection be permitted in the connection of any appliance, either for heating, lighting or cooking.

   B.   Pipe Size:

      1.   All supply lines, branches, drops and other parts of any piping installations shall be made of pipe of a size suited to the length required and the number and character of the outlets to be supplied. It is important that the minimum size for any pipe shall be as indicated in the following tabulation.

      2.   If any outlet is larger than three-eighths inch (3/8"), it shall be counted as more than one outlet, according to the following table:

Size In Inches	23	1/2	3/4	1	11/4	11/2	2	21/2	3	4
Value In Outlets	1	2	6	1	20	32	66	115	181	327
TABLE OF SIZES    Size Of Pipe In Inches
No. of 3/8 Inch Outlets	3/8	1/2	3/4	1	11/4	11/2	2
LENGTH OF PIPE IN FEET
1	20			30
2				27
3				12
4				50
5				33
6				24
7				18		70
8				13		50
9				44
10				35		100
11				30		90
12				25		75
13				21		60	150
14				18		53	130
15				16		45	115
16				14		41	100
17				12		36	90
18						32	80
19						29	73
20						27	65
21						24	58
22						22	53
23						20	49	200
24						18	45	190
25						17	42	175
30						12	30	120	300

 

(Ord. 15.28)