If you really want everything to be correct the go to ASME B16.5 and read up on how bolt lengths are calculated. Then do your own calculations to find out what the lengths should be. Then make your bolt tables match your calculations.
I would advise you not to use third party length calculations as being correct.
If you compare a number of different sources (Trouve, Pipedata pro, ASME B16.5, plus manufacturers) you will find that they do not all agree with each other on bolt lengths.
Some calculate in inches. Some calculate in inches then convert to mm.
Some do all the calculations in mm but disagree on rounding up/down on conversions.
All seem to use 1/16" (1.6mm) gaskets in the calculation which may or may not give the correct answer if a 3mm gasket is used.
In all cases the given bolt length is more likely than not going to be too short as they use the flange thickness as given in 16.5, but the manufacturing tolerance is something like -0mm to +6mm.
If you really want everything to be correct the go to ASME B16.5 and read up on how bolt lengths are calculated. Then do your own calculations to find out what the lengths should be. Then make your bolt tables match your calculations.
I would advise you not to use third party length calculations as being correct.
If you compare a number of different sources (Trouve, Pipedata pro, ASME B16.5, plus manufacturers) you will find that they do not all agree with each other on bolt lengths.
Some calculate in inches. Some calculate in inches then convert to mm.
Some do all the calculations in mm but disagree on rounding up/down on conversions.
All seem to use 1/16" (1.6mm) gaskets in the calculation which may or may not give the correct answer if a 3mm gasket is used.
In all cases the given bolt length is more likely than not going to be too short as they use the flange thickness as given in 16.5, but the manufacturing tolerance is something like -0mm to +6mm.
