If this happens the Fire Code says:
Where the pressure of the piped natural gas supply is insufficient to ensure such safe operation, approved equipment shall be Provided between the gas meter and the fuel consuming appliance that increases pressure to the level required for such safe operation.
Install combination flashback arrestor check valves on torches connected to piped natural
Torches connected to piped natural gas must have a pressure supply of at least 5 psi
and not more than 15 psi
SECTION FC 2609: Piping Manifolds And Hose Systems For Fuel Gases And Oxygen
Chapter 30 and NFPA 51.
Fire Department Rules, which accompany the Fire Code go on to say:
To read the entire document go to http://www1.nyc.gov/assets/fdny/downloads/pdf/about/fdny-
(a)Scope. This section sets forth standards, requirements and procedures for the design, installation, operation and maintenance of devices and installations utilizing piped natural gas and oxygen, including torches used in the manufacture of jewelry. This section shall apply to both new and existing devices and installations.
(e) Design and Installation Requirements
(3) Pressure booster. When the natural gas supply pressure is less than five (5) psig a pressure booster shall be provided to increase pressure to at least five (5) psig, but not more than 15 psig.
(4) Flashback arrester and check valve. A UL listed combination flashback arrestor and backflow check valve shall be installed:
(A)On the oxygen supply line, between the final oxygen supply pressure regulator and each fuel consuming device
(B)On the natural gas supply line, between the final natural gas supply pressure regulator and the fuel consuming devices.
(f) Operational Requirements
(1) Natural gas supply pressure. Natural gas pressure supplied to a device shall not exceed 15 psig, and the oxygen supply pressure to a device shall not exceed the natural gas supply pressure.
Check valves only prevent
oxygen from flowing into the natural gas pipeline
Flashback arrestor check valves
extinguish the 5,000 degree
flame from a flashback and
stop oxygen from flowing into the
natural gas pipe.
When a torch flashback reaches
the gas meter it can explode violently
and pieces of the casing will fly
across the room, injuring anyone
On March 16, 2009 the Fire Department sent a notice to NYC jewelers to explain Rule
If you have questions about the Fire Code or Rule 2609-