ASME Code Stamp Required for a Pressout Vessel?

[cltengr]

If a vessel is not subject to 15PSI+ pressure during the processing of product inside but is by a platen and press exerting 60PSI+ on the product to discharge it through a discharge nozle at the bottom of the vessel, does the vessel need to have an ASME code stamp?

Regarding the same scenario, the lid of the vessel is obviously removeable to allow the press to discharge the product. Does the lid need to be ASME code stamped also due to the fact that someone years later may assume that the ASME code stamp on the vessel also applies to the lid?

 

[JStephen]

It's hard to tell exactly from the description. But not every pressure-containing item is subject to ASME B&PV Code. A good example being hydraulic cylinders.

 

[jte]

Sounds to me like you have a situation analogous to a tube of caulk in a caulking gun. The goop (to use the technical term) is pushed by a piston and extruded out of the hole. If the piston is causing 60 psig, then the shell and nozzle are seeing that pressure (basic statics here). So I'd say you wouldn't be able to weasel out of the scope of the code with the "less than 15 psi" argument. However, it sounds to me as though the U-1(c)(2)(c) excemption might fit: pressure containers which are integral parts or components of… reciprocating mechanical devices… hydraulic or pneumatic cylinders where the primary design considerations and/or stresses are derived from the functional requirements of the device… Seems to me that the 60 psi pressure and its resulting stress is derived from the functional requirement of the device to eject goop.

jt

 

[SnTMan]

I tend to agree with JStephen & jte, however I would add that if you decide to Codestamp, the lid does not need to be Code stapmed, but it does need to be permanently marked identifying it to the stamped vessel.

Regards,

Mike4

 

[metengr]

Unfortunately, the only opinion that counts is from the Jurisdiction (if applicable) or your Insurer, not from ET. However, you have several ideas to formulate a game plan. I always found that when I have discussions with regulators or insurers, if you have a game plan on game day you have the edge.

 

[JimCasey]

It sounds to me that it is entirely possible for the vessel to see 60 psi in the event of a simple blocked outlet. Unless the removable lid is not fastened shut to provide for atmospheric pressure inside the tank.

If you pop the tank and it was NOT codestamped and protected by an ASME VIII relief device, you're gonna' have some 'splainin' to do. If it IS codestamped, and protected, and you still expreience a catastrophic failure, chances are you won't go to jail.

 

[200782]

I AM DESIGNING A VESSEL WITH A DUAL MATERIAL (A182 317/317L), I HAVE CHECKED THE B16.5 AND I HAD NOTICED THERE IS NO REFERENCE TO THIS MATERIAL AS DUAL GRADE. CAN YOU TELL ME WHERE CAN I FIND THE MAWP VALUE IN ORDER TO SET THE TEST PRESSURE?

 

[metengr]

200782;
Please start a new thread. Second, please hire some professional help regarding your pressure vessel design before someone gets hurt.

 

[jte]

...and third, LOSE THE CAPS LOCK KEY. Its not polite to SHOUT in a forum.