Pressure tapping for gas station pressure instruments
Thread Content
What is the thread size of the pressure gauge connection port in the diagram, in metric units? Imperial? The locally installed equipment is a domestic two-valve assembly – are there any unified requirements for this standard? For threads, hole size.
There is an 80% chance of npt1/2, and a small chance of m20*1.5； Use a thread gauge to measure it
Is it NPT1/2? External thread?
Generally, the thread standard for a measurement and control point should be consistent; either imperial or metric is acceptable – it’s not a major issue.
What is it usually in imperial units, and what is it in metric units? Where can I find it on the drawing? Is it done using socket welding?
Refer to HG/T 21581-2012 Automation Installation Atlas.