Hi Stanweld;
According to the formulas provided in UCS-79(d), the extreme fiber elongation is 7.19% for the small bore nozzle, and 5.1% for the large nozzle (with other nozzles ranging in between). As indicated in a response above, I think I've convinced myself that the stress relief prior to...
In response to vesselfab and stanweld, the thicknesses range for different nozzles. 30mm thick is the thinnest nozzle rolled to an ID of 387mm. Thickest nozzle is 70mm rolled to ID of 1372mm. Material is SA-516 Gr.70N, and the nozzles are cold rolled.
Hi metengr / doct9960
Thanks for your responses. According to the interpretation [VIII-1-95-50] provided by Doct9960, it seems as though you could proceed to weld on the formed head prior to a stress relief heat treatment and then use the final PWHT in accordance with UCS-56 to satisfy the...
Hi metengr,
Thanks for your response. I am just trying to get the correct interpretation of UCS-79. My interpretation was that since UCS-79 refered you back to UCS-56 requirements[Requirements for Post Weld Heat Treatment], that the PWHT satisfied the nozzle stress relief requirements due to...
Hello fellow engineers
Is anyone out there familiar with paragraph UCS-79(d) which states that "pressure boundary parts of carbon and low alloy steel plates fabricated by cold forming shall be heat treated subsequently (see UCS-56) when the resulting extreme fiber eliongation is more than 5%...
Isthil,
You have to take a look at Section 5 of the AS1170 Code. The aerodynamic shape factor, (Cfig), is calculated from the equations in Section 5.2. It is dependant on whether it is external pressure or internal pressure and you will have to look up certain factors , Ka, Kc, Kl, Kp, etc...
Just wanted to let you guys know that I think I found the limit for the maximum reinforcemnt thickness...If I would have looked closely, I wouldn't have needed to ask the question. If you look at Fig UG-37.1, and the limits of reinforcement, the max limit of reinforcement perpendicular to the...
Thanks to all for your replys.
I have been playing around with our Compress model and I believe that I have found a solution that satisfies both UG-37 and WRC107 without requiring the extra repad (using the original repad thickness of 15mm). And, it still falls within the limits of...
Thanks for your quick responses PVRV and prex.
In regards to your questions PVRV, the shell material is super duplex SAF 2507 (UNS:32750)and the shell has a diameter of 4340mm (ID). The nozzle is actually mounted at a 45 degree angle wrt the axis of the shell. Therefore the length of the...
Fellow Engineers,
Firstly, I apologize if this becomes a long question...
I currently have the task of reviewing a Vendors Code calculations for an ASME Div VIII pressure vessel operating at 515 kPa (75psi) and 160 degrees Celcius. The Vendor previously had selected a shell thickness of 15mm...
