Electrical Isolation for natural gas piping

[gatman]

The 1997 Uniform Mechanical Code requires electrical isolation for fuel gas piping (paragraph 1312.7). What fittings are listed or approved for fuel gas service that are capable of electrically isolating natural gas piping? The piping I am concerned about is black iron, threaded, 3/4" to 2" in diameter. The pressures are low, 5-15 psig.<br>
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Is there an authority that has approved dielectric unions for this service? I have been looking for an answer to this problem for a month and have come up empty. The local gas companies use isolation fittings as a standard practice, but that is not adequate for the building official I am working with.<br>

 

[gatman]

I was able to answer my own question. I contacted Paul Cabot at the American Gas Association. The AGA is an affiliated group of gas companies who are active in development of the NFPA and other codes. Very much like a professional organization such as ASHRAE or ASME.<br>
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Mr. Cabot tells me there are no listed fittings for natural gas service. He also tells me gas companies use dielectric unions and isolation flanges as standard practice.<br>
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The testimony of Mr. Cabot along with catalog cut sheets from the local gas companies should be enough to convince the mechanical inspector of thier validity.