I have a forged pressure vessel head. If I invoke ASME III NB-2540 for examination of forgings and opt to use ultrasonic examination in accordance with NB-2542, the acceptance standards seem very vague.
The first thing that NB-2542 does is invoke Article 5 of Section V of the ASME BPVC. That is...
We are in the process of designing a large heat exchanger. It has two fixed tubesheets, for example TEMA type AEL. The tubesheets are "loose" and sandwiched between girth flanges on the shell and channel, similar to the image below.
The nozzle loads on the channel are considerable and the...
Dear all,
I'm after some insight as to what is considered "normal" in your organisations for showing valve bridgewall markings on piping schematics/P&IDs. Is this information always shown? Sometimes shown? Never shown?
Also, what symbols are used? Arrows? The cranked bridgewall marking...
I have a supplier who is proposing to make the nozzles on a pressure vessel from thick plate, eg by boring the plate into a pipe shape. I can't find anything to specifically prohibit this in the code, but I don't think it's right because of the possibility of defects and segregation down the...
A quick search for "visual" in ASME III generates precious few hits - basically the code seems fairly silent on the matter. On the other hand, I expect visual examination to be used liberally, especially for welds. Am I missing something?
If designing a vessel or piping under the Pressure Equipment Directive (PED) using EN13445 or EN13480, requirements for material certification (3.1, 3.2, 2.1 or 2.2) are given in EN764-5. In EN764-5 is a flow chart which defines the requirements for "main pressure-bearing parts" and...
Dear all,
A couple of simple questions which I'd welcome your opinion on... I have a process vessel which is partially filled with a single component saturated liquid. Above the saturated liquid is vapour. Occasionally, due to an upset, the pressure in the vapour space is rapidly decreased. The...
Hi,
I am trying to write a macro to determine if an entity (face, vertex, surface etc.) which a user has selected is part of a solid body (ie an item which is a member of the solid bodies folder at the top of the feature tree) or if it is part of a surface (ie an item which is a member of the...
Hi valve experts,
I have a system with a high turndown ratio. We will use globe check and stop check valves in a couple of locations. I can find very little literature on how to size these check valves to ensure that they are fully open, or at the very least acceptably open, at low flow rates...
Hi valve experts,
After scouring the internet and a couple of text books I have access to, I can't get a straight answer to this question.
Given a straight pattern (ie vertical spindle tee pattern) globe stop check valve, and a wye pattern stop check valve, what are the relative advantages and...
