cespi82
Materials
- Dec 23, 2009
- 36
Hello everybody!
I am new in this forum, and also kind of new in this Pressure Vessel field.
I have a question regarding the Nozzle Neck minimum required thickness for an in-service vessel. What is UG-45 table based on? are those values considering structural loads for the nozzle itself? What about nozzle length and weight?
The question comes from the fact that running calculations for Nozzles as per UG-27, the outcome will be a very low thickness required as the Desing Pressure of the vessel is low (75 psi). For a 2" nozzle at this DP the minimum required thickness would be 0.007" which is like the thickness of a paper sheet. Long before we have reached that thickness, the nozzle would have collapsed already. Besides that, if I use this minimum required thickness values for performing Remaining Life calculations, the result will be over hundred years. It does not make any sense for me.
I checked in both API-510 and NB-23 and I did not find any other calculation path than use ASME Code. Can I use the design code ASME Sec VIII Div 1 for calculating these minimum required thickness values despite of the equipment has been in service for over 20 years?
Thank you very much in advance...
Kind regards,
I am new in this forum, and also kind of new in this Pressure Vessel field.
I have a question regarding the Nozzle Neck minimum required thickness for an in-service vessel. What is UG-45 table based on? are those values considering structural loads for the nozzle itself? What about nozzle length and weight?
The question comes from the fact that running calculations for Nozzles as per UG-27, the outcome will be a very low thickness required as the Desing Pressure of the vessel is low (75 psi). For a 2" nozzle at this DP the minimum required thickness would be 0.007" which is like the thickness of a paper sheet. Long before we have reached that thickness, the nozzle would have collapsed already. Besides that, if I use this minimum required thickness values for performing Remaining Life calculations, the result will be over hundred years. It does not make any sense for me.
I checked in both API-510 and NB-23 and I did not find any other calculation path than use ASME Code. Can I use the design code ASME Sec VIII Div 1 for calculating these minimum required thickness values despite of the equipment has been in service for over 20 years?
Thank you very much in advance...
Kind regards,