Calculation of bolt length for high pressure flange
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According to the flange bolt length provided by HG20613, the bolt length calculated under low pressure is similar to the bolt length in the specification. However, the bolt length calculated after PN63 is much shorter than the specification. Why is this? Is more than one nut installed when the high-pressure flange is installed?
There is no way, our company still needs manual statistical materials, so I wanted to make a data table and calculate it directly, but I found that the calculation was wrong.
If you look at the standards carefully, the length of bolts (LSR) in the standards is only given to PN16, and above PN16 are the lengths of studs (LZR), so you have at least missed the thickness of one nut. Besides, bolts are generally not used for high pressure.
I looked at it and found that I was indeed wrong. The title said bolts and studs, but the codes below were not for bolts. I misunderstood. LZR was for studs, so what is LZJ?
I flipped through the previous description and found the code name for LZJ, but I didn’t read it carefully enough.