Nozzle Inspection Minimum Required Thickness
Nozzle Inspection Minimum Required Thickness
(OP)
Hello,
I was having a discussion with an inspector regarding how to determine whether a nozzle would need repairs or not. He is aware of the ASME BPVC calculations for nozzles, but he can not perform calculations for every nozzle (budget constraints).
He has been running the calculations for thickness required from pressure in conjunction with a table in API 574 for determining the required thickness from nozzles (Table-6 Minimum Thicknesses for Carbon and Low-Alloy Steel Pipe); although API 574 is meant for piping rather than nozzles.
Could anyone share any procedures or tips for inspectors regarding how to determine whether a nozzle has corroded past its thickness required asides from running ASME BPVC calculations?
Thanks,
Eddy
I was having a discussion with an inspector regarding how to determine whether a nozzle would need repairs or not. He is aware of the ASME BPVC calculations for nozzles, but he can not perform calculations for every nozzle (budget constraints).
He has been running the calculations for thickness required from pressure in conjunction with a table in API 574 for determining the required thickness from nozzles (Table-6 Minimum Thicknesses for Carbon and Low-Alloy Steel Pipe); although API 574 is meant for piping rather than nozzles.
Could anyone share any procedures or tips for inspectors regarding how to determine whether a nozzle has corroded past its thickness required asides from running ASME BPVC calculations?
Thanks,
Eddy





RE: Nozzle Inspection Minimum Required Thickness
I'd vote for calcs...
RE: Nozzle Inspection Minimum Required Thickness
The pressure calc is useful information but should be done using ASME VIII or API 510 formulas since the result may differ slightly from piping code. In any case the pressure calc alone will not account for any nozzle thickness used for reinforcement; so if you go below the C.A. on the nozzle, both pressure and reinforcement calculations will be needed to ensure that any additional reinforcement thickness, or interaction with the shell thickness, is accounted for.
RE: Nozzle Inspection Minimum Required Thickness
When the loadings are unknown, the nozz Tmin is a SWAG*
*scientific wild-ass guess.
RE: Nozzle Inspection Minimum Required Thickness
RE: Nozzle Inspection Minimum Required Thickness
Regards
r6155