See UG-31
(2) Where ends are threaded, additional wall thickness is to be provided in the amount of 0.8/n in.(20/n mm) [where n equals the number of threads per inch (25.4 mm)]
I don't know your activity: manufacturing? Process design and manufacturing?
Be careful with the scope of work, think about money and prestige.
Avoid conflicts and headaches.
@Trestala
You are those engineers (engineers?) who look for a sketch in the CODE and if you don't find it, you have nothing to do. You have to read the text.
I insist:
"Please more data: PV vertical or horizontal, general dimensions, material, original thickness, pressure / temperature, wind / seismic, .... etc.. ???
Has the design calculation been checked now?"
Thread standard of inch thread: PT is the abbreviation of Pipe Thread, is 55° seal tapered pipe thread, belongs to the Wyeth Thread family, mostly used in Europe and the Commonwealth countries. Commonly used in water and gas pipe industry, the taper is 1:16.
– Thread standard for American...