instrument flange rating
instrument flange rating
(OP)
Deat all,
I need an advice.
In all equipment mechanical data sheets that i have seen the rating of instrument flanges is one level higher than other flamges. Is there any regulation or mandate for this?
I need an advice.
In all equipment mechanical data sheets that i have seen the rating of instrument flanges is one level higher than other flamges. Is there any regulation or mandate for this?





RE: instrument flange rating
RE: instrument flange rating
RE: instrument flange rating
RE: instrument flange rating
RE: instrument flange rating
We need more information.
Sometimes its possible to do all the right things and still get bad results
RE: instrument flange rating
I thought you were asking about the pressure rating of a 2-bolt "instrument flange" of the sort used on a pressure transmitter....
RE: instrument flange rating
The equipment data sheets rated to Class 150 and consultant considered a philosophy as minimum Class 300 on instrument connections for mechanical strength.
RE: instrument flange rating
Oops! Now the flange rating of the instruments does not meet the pressure rating of the vessels (and piping). Now refer to ASME B16.5 paragraph 2.3.2. We have a problem.
Far easier to pay a bit more for more robust flanges than to risk project delays and substantial high level engineering involvement by all parties.
RE: instrument flange rating
I am also familiar with the exact situation you described. Certain flanged piping "specialties" are not commercially available in the "stronger" materials of construction.
donf
RE: instrument flange rating
Another solution, which might be more practical than jumping up a flange class for every flanged instrument connection, would be to put the stainless steel instrument flanges into the carbon steel pipe spec and thereby limit the MAWP to something more practical.
RE: instrument flange rating