Joints assembled with strong, long bolts are MORE FLEXIBLE than those assembled with short bolts, and two-flange joints are more flexible than single-flange joints. A more flexible joint will withstand more abuse, such as differential thermal expansion loads. Stronger bolts also permit higher...
I'll show you the way to learn how to assemble bolts.
If you don't put in the effort to understand the basic principles, I can't do any more for you.
You need to study further to understand it without help.
I don't care what you think of me.
@ A8yssUK
If you are a flange gasket expert, then why not read ASME PCC-1 2022?.The answer is here.
You said: “Also, the bolting friction factor at 500°C is irrelevant, as you are torquing at room temp.”
The lubricant is present at 500 C, did you consider that corrosion could occur?
Control of the bolt stress is possible by means inherent in the procedure especially if effective thread lubricants are employed, but in all cases the bolt stress can be regulated within reasonable tolerances by measuring the bolt elongation.
You need to read more, over and over again. Or take...
@XL83NL
I already responded on Sunday at 7:32 PM.
You're too comfortable and don't read ASME PCC-1.
If you don't understand it, I can't do anything else.
@ Trestala
It's obvious you have no experience in manufacturing or inspection.
.I'm sure you've never prepared an inspection plan or performed pressure tests, leak tests, or other tests.
Hence, your comment is ridiculous.
And......what is your help to the (OP)?
1) @Krausen
I work in pressure vessel manufacturing. The testing is more demanding than at the plant.
There is a procedure for checking bolt elongation on small flanges, without measuring all the bolts, only one of them is measured. Very easy.
2) All of you use the same torque value for a short...
@ XL83NL
I assume that you don´t read ASME PCC-1 2022
For your example Flange NPS 2 Class 150the stud diameter is 5/8”. Care must be taken for small diameter of studs because the required stress can be exceeded during installing.
ELONGATION
I need only a Vernier caliper as a...
Never torque, use elongation
Example: Torque value is the same for stud 25mm diam x 75mm long or 400 mm. Ridiculous.
For stud elongation the length is the input.
Nobody mentions about this difference.
Please take a look in ASME PCC-1