Vessels under pressure

That happens to be my area of work right now :) AS it may seem to relate to mexican legislation, here is the actual definition:

According to NOM-020-STPS-2001, RECIPIENTES SUJETOS A PRESIÓN Y CALDERAS - FUNCIONAMIENTO - CONDICIONES DE SEGURIDAD:

"4.26 Recipiente sujeto a presión: aparato construido para operar con fluidos a presión diferente a la atmosférica, proveniente dicha presión de fuentes externas o mediante la aplicación de calor desde una fuente directa, indirecta o cualquier combinación de éstas."

There are also boilers (calderas), hyperbaric chambers (cámaras hiperbáricas o campanas), and cryogenic vessels (Recipientes criogénicos). The definitions lie in the same law.

For any further information, my email is sankappa ( ) gmail (d ot)com

BTW, Happy new year!!!

HIIIi frnd....

Well if u refer the ASME SEC VIII-1 (chapter-1),it clearly gives the scope of code and says that:"Equipments having Internal diameter greater than 150mm are considered as pressure vessels and are to be designed as per code...."

ASME BPVC, Section VIII, Division 1 (not chapter 1) for pressure vessels. Pressure vessels such as fractionators, filters, desalters, separators, accumulators, boilers, slug catchers, deaerators, knock out drums, ... etc.

According to ASME code, there are codes for design, fabrication and inspection of pressure vessels which differ from that codes for piping systems or for heat exchangers.

Dear friend

could you please suggeste me any thises for MS on design of pressure vessel

You question is rhetorical--a language syntax/diction/usage problem--and NOT technical. This means any and all answers you might get here, will not help you write the thesis because you won't know any more than you've already guessed.

You should take the question up with your thesis counsellor to find an appropriate usage. It would be his job to help you get the confusion cleared up...and the nomenclature monkey off your back. That's a counsellor's job.

Let us know what your counsellor advises, if you want. Here's where you can discuss technical aspects of the thesis as you develop it.

Good luck with it.

Re: Vessels under pressure: A definition of a vessel is something that contains or holds something. Tanks, tubes, even ocean-going ships can be considered vessels. In WW II, some ships that were carrying dried beans in their holds were torpedoed but the torpedos were duds, and all they did was puncture the outer ship's hull. However, the sea-water soaked into the beans, causing them to expand considerably, thus rupturing the ship's outer hull structure and sinking the ships. One may assume that the ship's holds, in question, were thus carrying something which was under pressure, to cite an extreme case.

Right. And what appears might be needed is some way to arbitrate the selection of what is to be called the vessel in almost any (theoretical, sometimes practical as well) situation. This depends in large measure on--and also determines--what the (thesis) model will be: what to put in and what to exclude from the "vessel" that is being proposed for the model. This is why it was recommended to consult with thesis counsellor. Since the selection of what is to be called "vessel" can be flexible (a vessel is pressure vessel by virtue of some ability to store and convey pressure to connected pathways and components), OP must realize that it is form and function, not dictionary definitions, that he needs to rely on to demarcate his "vessel"...from the "non-vessel." Answers here, as likely as not, only tend to leave him with multiple possibilities to choose from, or equally or more confused about how to make the selection (if it's not patently obvious to a non-expert). The safest "bet" for winding up with a pass-worthy model (an application based vessel definition) is one that involves input with one of the persons reviewing the thesis, the one with greatest interest in the student candidate's success: his thesis adviser/counsellor. Also, sometimes demonstrating knowledge of how to find answers is more important than the answers themselves.

In the UK, any structure that is made out of scheduled pipe, tubing or hose is not considered to be a vessel, as the material is type-tested for strength and its rating is given in the schedule. So these materials can be simply used without needing further mechanical design calculations.

Any structure that falls outside the type-test is a vessel, and needs to be designed separately according to the correct code for its intended use.

Your English is better than mi Español. All of the prior responses have given most of the advice you need, particularly the "consult your advisor" response. It is more likely to run afoul of a semantic/linguistic definition than a technical one. However, you also have gotten several important additions to the technical definition of "vessel" as well. There are so many well-qualified people in this Forum, the mind boggles! Keep them posted on your progress?

So, Pipe, tube, or Pipeline could be considered as a vessel?

And What devices are considered as pressure vessels? can you give me a list of them? I Know pipeline, vessels, vehicular gas cilinders, extinguisher.

I'll try to explain in plain english - Anything closed from top & bottom (vertical position) or both sides (horizontal position) filled with any media (water/air/gas/steam) and is pressurized and can explode on over pressure installed with a Safety Relief Valve is considered as "Pressure Vessel".

Size has nothing to do with it. A simple pressure cooker in the kitchen can be termed as a pressure vessel though it is referred as a cooker. The term "pressure vessel" can take up many names as : Pressure Vessel for generating steam = Boiler, Pressure Vessel as compressed air storage = Air receivers, A pipe dished at both ends, receiving steam/air and outlets with valves for distrubtion = distribution headers, pressure vessel receiving water from pumps = booster vessel, chemical cooking vessels = reactors, and other names like chambers, retorts, valcunizer etc. and so on . Each with a different name as per the different process BUT all common to one thing - MEDIA (GAS/AIR/WATER/STEAM) IN PROCESS CHARGING & DISCHARGING OR AS STORAGE BUT CAN EXPLODE & MUST HAVE SAFETY VALVE = Pressure Vessel.

hoses, pipeline, extinguisher, vehicular gas cylinders though they too are pressurized but not installed with a safety valves are called by their names though they are all pressuized and in form of vessels however, but not called pressure vessels. Gas cylinders for example are very dangerous but by standing they do not explode, when you take out gas you've to install the regulators.

All above I've tried to explain you are my personal opinion and not from any book.

Not to put too fine a point on it, as you DID mention chemical reactors and vucalnizers, but the liquid need not be restricted to water...

As per criteria given in ASME section VIII Div 1 following vessels will be not considered as pressure vessel

As per clause No.U-1-(C)(2)(h)
Vessels having Internal or external pressure not exceeding 15 psi with no limitation in size

As per clause No.U-1-(C)(2)(i)Vessels having ID,width,height or cross section diagonal not exceeding 6 inch with no limitation on length of vessel or pressure

You are right, it is not mandatory per code to apply the code rules on that type of vessels where its pressure not exceeding 15 psi.

But when the owner -through a contractual obligations- specifies his request to apply the ASME code for such a vessel even subjected only to an atmospheric pressure or any pressure not exceeding 15 psi, in this case you have to (mandatory) apply all the rules of ASME code.