How tight is too tight? 1.5\" & 2\" black steel pipe and fittings

When dealing with 2-inch black steel pipe and fittings, it's important to find the optimal tightness. While sealing the threads as described, remember that there's no need to apply excessive force. Typically, fittings only need to be tightened to a point where an additional two full turns could still be made if necessary. Achieving this balance takes some practice. Don’t fret about fittings breaking; when steam first contacts the joint, the fitting might loosen slightly. Good luck with your installation!

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Pipefitters, Your Input Needed! Black Iron/Galvanized Residential Gas Fitting Protocols?

I am seeking a standard set of guidelines for residential gas piping, specifically for sizes 1/2" to 1.5" in black iron or galvanized pipe. While everyone has their methods, I’m interested in the practices followed by trained professionals. What should one inspect on a gas job to ensure correct installation? Here are some generalizations I'm curious about—are they accurate?

1. Thread Depth: For instance, a 3/4" pipe should ideally have 3/4" of threads inserted into the fitting. This results in adding a combined 1.5" to the total pipe length for correct fitting.
2. Thread Cutting: Use ample oil and make steady, slow cuts to avoid tear outs.
3. Thread Measurement: Properly cut threads should hand-thread dry for approximately 3-4 turns before requiring tools. With Teflon tape or pipe dope, the total should reach around 6-7 turns.
4. Teflon Tape: Use yellow gas tape with about 3-4 wraps on all threads. Avoid taping the first thread to prevent contamination inside the pipes.
5. Pipe Dope: Often used on top of Teflon tape, products like Rectorseal No. 5 are popular. Factors like local conditions could dictate the type of dope used.
6. Pressure Testing: Typically done at 10-15 psi and left to test for at least one hour. Temperature changes can affect the results.
7. Valves and Appliances: Should be capped during pressure tests to prevent damage.
8. Regulation: Residential gas pressures are generally regulated to below 1-2 psi at or before the meter.
9. Tightening Pipes: Properly done with appropriately sized wrenches to prevent cracks and leaks.
10. Re-Tightening Pipes: If loosened, pipes should be fully re-taped and re-installed rather than just re-tightened.
11. Drip Legs/Sediment Traps: Should be installed before appliances to catch debris and moisture.
12. Pipe Quality: Pipes from China may be harder to thread compared to pipes from the USA. Quality preferences may vary.
13. Material Choice: Whether using galvanized or black steel depends on local codes and environmental conditions. Each has its pros and cons.

Feel free to share your insights or verify these points. I am keen to learn from professionals with extensive experience in gas line installations.

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