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johnchrc, You may want to look into the leak paths again. A thread has a root and crest. Each are in a leak path zone. Normally the thread flanks are engaged metal to metal, however the roots and crests are in clearance. That means two leak paths. I concur with your torque theory in a way, if...

rconner, Cross threading is a major issue as you say. And the stabbing and preliminary assembly is very important for the succesful end result. Normally an experianced assembler has experianced this before and knows that he has to throw away those parts. Also after several times he cross threads...

In thread design of Oil Country Tubulars, which the NPT was the starting point or Grand Father, thread compound is used to plug the leak path, not to guarentee a seal. There are two leak paths located at the roots and crests. Also the thread compounds are lubricants to help lower the friction...

Mr. CRG is correct in a unique way. I never thought of entering feel in the equation, but here is a possible way of putting it on paper. The oil field uses special power tongs to assemble connections that records, via computer, Torque vs. turns, torque vs. time, and torque vs. position. The...

I just had to get in this discussion. I’ve been designing threads since the 70’s and been trying to figure a reliable torque formula for threads for the same amount of years. My conclusion so far is, not even PhD’s can solve for torque, to be reliable for the every day assembler. The reason is...

Thank you zdas04 and sailoday28 for the comments. It is greatly appreciated!!!!!!!! I’m more mechanical than verse in fluids. In pursuing the same subject, I would like to explain further do-loops I’m going through. In Crane 410 the equations seem to deal mostly with a single pipe and tailor...

I've been studying Crane 410, trying to figure out an equation to determine pressure drop in a tubular annulus (tube within a tube). Crane page 1-4 under Hydraulic Radius mentions vaguely that the Hydraulic radius would be 1/2 the width of the passage. Does this mean 1/2 the annular wall or does...