API 5B Long Line Pipe Threads

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Several years back API listed a NPT thread called long line pipe - basically the start of taper is smaller and the diameter at the hand tight plane is the same. The L1 dimension is longer than a standard NPT.

Does anyone have the old copy of API - I'm guessing it was published in the 1970's.

Does anyone know the offset for the 2 inch size?

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