B16.34 Threaded Ends Valve

[eteoh]

Hi there,

I'm trying to measure the end dimension wall thickness of the valve. According to B16.34, 6.2.4 the end wall thickness should be accordance with Table 4.

I just wonder how can I measure the wall thickness with the internal taper pipe thread. Is the wall thickness start from the pitch of the thread, or is it start from the root of the thread?

Thanks in advance.