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Rick,
We use unions on high pressure gas lines less than 2 inch nominal diameter. While compression fittings and stainless steel tubing is easier to work with for low flow, low pressure lines, the pipe is fine.
The tape works fines, we use it regularly on the pipeline. Pipe dope works great too, and I would prefer that to tape when working with pipe (versus smaller NPT threads 1/2" or less).
We test connections with "Snoop" which is just soapy water. Make your own. Try to support the pipe best you can.
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