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Thanks BJI for quick response.

ASME B16.5 Para. 6.3.2 says a raised face may be removed from a raised face flange to convert it to a flat face flange, provided that the required dimension, tf, shown in Fig. 6 (Fig. II-6 of Mandatory Appendix II) is maintained. ASME PCC-2 Para. 3.1 says under-thickness of a raised face due to...

Hello Everyone, I have a 36” man-way close to the floor of an API 650 Tank. As per Fig. 5.8, we need to have a low type re-pad for the man-way, but the manufacturer says an ordinary (circular) re-pad is ok, as long as it provides the reinforcing required as per Para. 5.7.2 and distance between...

Hello Everyone, I have a 36” man-way close to the floor of an API 650 Tank. As per Fig. 5.8, we need to have a low type re-pad for the man-way, but the manufacturer says an ordinary (circular) re-pad is ok, as long as it provides the reinforcing required as per Para. 5.7.2 and distance between...

Can we say an atmospheric tank externally covered with pressurized 3” half pipes (ASME VIII-1 – App. EE), is not a pressure vessel? Can I say tank’s shell and half pipes are making the pressurized containment with the diameter less than 6”, and so, as per U-1 (C)(2)(i), it is not a pressure...

Does any body know why COMPRESS decreases the earthquake load for vertical vessels by 1/3, but does not do it for horizontal vessels (for example when NBC 2005 has been chosen)? I have noticed for both vertical and horizontal vessels, COMPRESS increases the allowable stresses as per UG-23(d) for...

I have a 2¼Cr-1 Mo-¼ V Reactor, ASME Sec. VIII, Div 2 High Temperature/Pressure and Hydrogen Service. Material and fabrication must meet the requirements of API-934A. Considering sensitivity of this material regarding propagation of crack, and all the effort required to avoid crack during...

Thanks doct9960

Hello every one, I know skirts have better load distribution on the shell/bottom head, act better in cyclic services and less local stresses, and legs give better ventilation and better access to bottom nozzle. I would appreciate if anybody let me know other limitation and advantages of these...

I always avoid mixing two different codes. Div. I and II have different theoretical basis (two different failure theories), and different design factors, however the formulas/methods look similar, and results are very close. I have not hearted design with Div. II is safer, or even always more...

Thanks everyone. So for ASME Sec. VIII, Div. 1 vessel, DT and DP shall include all possible condition in the life time of the vessel including short term upset condition.

ASME VIII, Div. 1 defines Design Temperature and Pressure as T and P that shall not be less than the highest Temperature and Pressure in the most severe operating condition. Some people interpret it in a way that in the short term upset condition, P and T can be higher than Design Pressure and...

I appreciate any advice how I should deal with MDMT and Impact Test requirements in Sec I. Thanks, Amir

Thanks again gr2vessels, I also meant 750 mm down on the skirt. Upper part of the skirt is CrMo and very Hot (There is hot box from inside at that level). Your advise is great. We keep the current nameplate on bottom portion of skirt and put a duplicate one some where on pressure boundary and...

Thanks CodeJackal and gr2vessels, The current location of the name plate (on the drawing) is close to the skirt opening (of course outside). But AUTORIZED INSPECTOR has put such a comment on the location of the name plate. 750 mm from the skirt to head junction is still in the area of the...

Hi everyone, ASME Sect. VIII Div. 2, Para. AS-130(a) says nameplate shall be attached to the vessel. Does vessel mean Pressure Boundary or nameplate can be attached to the skirt also? My problem is with a heavy wall reactor with operating temperature 815F. Nameplate bracket attached directly...

Thanks EJL, PFT 51 is applicable for Furnace and Tubes of Firetube Boilers. Is this item applicable for steam drums as well? Amir

Hi Everyone, May somebody help me how a steam drum in Sec. I can be designed for external pressure?

Eventually we decided to use Sec. I. I appreciate for all your comments. Amir

MJCronin, Yes, both the Boiler and Steam drum must be ASME certified and stamped. This boiler will be installed in a refinery,and the refinery is not in IRAN!!! Do you know whether the steam drum can be designed and stamped under sec. VIII, when the Boiler itself is Sec. I? davefitz, I want...