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Vincent, Thanks for the reply. Do you know what standards would apply for determining/testing whether or not the surface was ignition capable? Do you know of any standards that define the specific requirements for insulated pipe / components in the classified area? For instance, does the...

Does anyone know the standard industry practices at refinery or similar industrial process plant that has hot pipes, flanges, valves, etc. that are installed in an IEC Ex hazardous locatioin area rated as Zone 2, IIB+H2 and requiring a T3 temperature code when many of the process piping...

For a pressure vessel that is designed to NACE MR0175 or MR0103, are internal components such as support rods and support plates required to have the hardness confirmed if they are not pressure boundary components? Thanks.

MR0103-2007, Section 2.8.2(f) for weld procedures for Duplex stainless steels states "The WPS shall not allow welding of components with wall thicknesses that deviate by more than 20% from that of the PQR specimen. This seems quite restrictive compared to normal ASME allowance of 2X the wall...

Thanks, I will do that.

I am looking for the calculations or a calculation tool for determining the required wall thickness of a 8"x4" rectangular mechanical tube that will be subjected to 43 psig operating pressure. I am familiar with ASME rules for cylindrical shell sections, but not rectangular. I would appreciate...

Thanks to everyone for your good input. If we PWHT we can achieve the -49 F MDMT, but we then looked at UCS-67(a)(2) as EJL noted. Unfortunately, the WPS that was used has been impact tested to -65 F, however is not set up for PWHT. We have another nearly identical procedure that has PWHT and...

The other materials are - Heads, SA-516 Gr. 70 hot formed at the normalized temperature above 1650F, curve D, MDMT = -55 F Nozzle pipe, SA-106 Gr. B, curve B, MDMT = -155 F per UCS-66(b) Nozzle flanges, SA-105, curve B, MDMT = -90 F per UCS-66(b)(1)(b) The shell material that is not currently...

Thanks to everyone for your input on this topic. The weld procedure that was used has been tested to -65 F. With the material not being normalized (curve B), we can only achieve an MDMT of -36 F using UCS-66(b). If it were normalized (curve D) then we could go down to -55 F. We are going to...

Our company designs and manufactures relatively small ASME VIII vessels. We currently have a project for a 36" OD vessel that was designed for the main shell section to be made from 1/2" thick SA-516 Gr. 70 normalized material so that we could achieve an MDMT of -49 F. The material was ordered...

Thank you Patricia. Now that I read over UG-39 again, I see what you are saying with regard to modifying the formula from UG-39(d) by the h factor from UG-39(e)(2). I have another application that is similar, except that it is being designed to ASME Section I. It appears to me that the...

If a bolted flat head with multiple openings is reinforced per UG-39(e)(2), does it also have to be reinforced per UG-39(d)(2)? My thinking is that UG-39(d)applies to flat heads with a single opening, while UG-39(e)applies to flat heads with multiple openings, so it seems to me that only the...

When a nozzle load on a ASME Section VIII, Div.1 vessel is based on pure thermal stresses, what allowable stress value may be used ? Our customer believes that for a pure thermal case, that the allowable material stress may be multiplied by 1.5X, but can not point to specific code section that...