Fuel gas branch lines under 2, over two, or no pipe size restriction on branch lines with brazing torch station and liquid flashback arrester components

Protective equipment, including a flashback arrester, is required in fuel gas and oxygen piping systems to prevent a reverse flow of oxygen from flowing back up the fuel gas line, or a reverse flow of fuel gas from flowing back up the oxygen line, also to prevent excessive pressure build-up in the system and stop a flashback from reaching the supply source. Piping systems shown comply to National Fire Protection Association Bulletin #51. Copies can be obtained by writing:

National Fire Protection Association, Inc.,
Batterymarch Park, MA 02269.

15 to 30 psig operating pressure

Standard
Cubic Ft
Per Hour
Length of pipe — Lineal Feet
501002505007501000125015002000
1003/4”3/4”1”1”1”1”1-1/4”1-1/4”1-1/4”
2003/4”1”1”1-1/4”1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”
3001’1’1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”1-1/2”1-1/2”
4001”1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”2”2”2”
5001-1/4”1-1/4”1-1/2”2”2”2”2”2”2-1/2”
7501-1/4”1-1/2”1-1/2”2”2”2-1/2”2-1/2”2-1/2”2-1/2”
10001-1/2”1-1/2”2”2-1/2”2-1/2”2-1/2”2-1/2”2-1/2”3”
12501-1/2”1-1/2”2”2-1/2”2-1/2”2-1/2”3”3”3”
15001-1/2”2”2”2-1/2”3”3”3”3”3-1/2”
17501-1/2”2”2-1/2”2-1/2”3”3”3”3-1/2”3-1/2”
20002”2”2-1/2”3”3”3”3-1/2”3-1/2”3-1/2”
2500
2”
2-1/2”2-1/2”
3”
3-1/2”3-1/2”3-1/2”3-1/2”3-1/2”
30002”2-1/2”
3”
3-1/2”3-1/2”3-1/2”3-1/2”4”4”
35002-1/2”2-1/2”
3”
3-1/2”3-1/2”3-1/2”4”4”4”

30 to 50 psig operating pressure

Standard
Cubic Ft
Per Hour
Length of pipe — Lineal Feet
501002505007501000125015002000
1003/4”3/4”3/4”3/4”3/4”3/4”3/4”3/4”3/4”
2003/4”3/4”3/4”3/4”3/4”1-1/4”1”1”1”
3003/4”3/4”3/4”1”1”1”1”1”1”
4003/4”3/4”1”1”1”1-1/4”1-1/4”1-1/4”1-1/4”
5003/4”3/4”1”1”1-1/4”1-1/4”1-1/4”1-1/4””1-1/4”
7503/4”1”1-1/4”1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”1-1/2”
10001”1”1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”1-1/2”1-1/2”
12501”1-1/4”1-1/4”1-1/2”1-1/2”2”2”2”2”
15001”1-1/4”1-1/2”1-1/2”2”2”2”2”2”
17501-1/4”1-1/4”1-1/2”2”2”2”2”2”2”
20001-1/4”1-1/4”1-1/2”2”2”2”2-1/2”2-1/2”2-1/2”
2500
1-1/2”
1-1/2”2”2”2”2-1/2”2-1/2”2-1/2”2-1/2”
30001-1/2”1-1/2”2”2”2-1/2”2-1/2”2-1/2”2-1/2”2-1/2”
35001-1/2”1-1/2”2”2-1/2”2-1/2”2-1/2”3”3”3”

50 to 100 psig operating pressure

Standard
Cubic Ft
Per Hour
Length of pipe — Lineal Feet
501002505007501000125015002000
1001/2”1/2”1/2”1/2”1/2”1/2”1/2”3/4”3/4”
2001/2”1/2”1/2”3/4”3/4”3/4”3/4”1”1”
3001/2”1/2”3/4”3/4”3/4”1”1”1-1/4”1-1/4”
4003/4”3/4”3/4”1”1”1”1”1-1/4”1-1/4”
5003/4”3/4”3/4”1”1”1”1-1/4”1-1/4””1-1/4”
7503/4”3/4”1”1-1/4”1-1/4”1-1/4”1-1/4”1-1/2”1-1/2”
10003/4”1”1”1-1/4”1-1/4”1-1/4”1-1/2”2”2”
12501”1”1-1/4”1-1/4”1-1/2”1-1/2”1-1/2”2”2”
15001”1”1-1/4”1-1/4”1-1/2”1-1/2”2”2”2”
17501”1-1/4”1-1/4”1-1/2”1-1/2”2”2”2”2-1/2”
20001”1-1/4”1-1/4”1-1/2”2”2”2”2-1/2”2-1/2”
25001-1/4”1-1/4”1-1/2”2”2”2”2”2-1/2”3”
30001-1/4”1-1/4”1-1/2”2”2”2”2-1/2”3”3”
35001-1/4”1-1/2”2”2”2”2-1/2”2-1/2”3”3”
*Please note: Data provided is for reference only, please call us at 800-651-9490 for engineering assistance

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