7 replies to this topic

[mady07]

Dear ART

 

i want to design a pressure vessel mainly a storage pressure vessel for an chemical industry. i am mechanical

engineer student and i want to design it for my final year project. this storage vessel will store sour gasses and hydrocarbon liquids like [NGL, liquid sulphur etc]. can u suggest me with possible ideas about this topic? any recommendation u have got then do forward it to me 

 

Also i am interested about your logbook of pressure vessel design. it will be helpful for me in my project. do forward me 

 

My name - Mehedi Ahsan
Country - United Arab Emirates
Mail address - mady0798@gmail.com ; el_mady19911@hotmail.com

 

Best regards 
Mehedi Ahsan
 

[ankur2061]

Mehedi Ahsan,

 

Refer the attachement for "Pressure Vessel Design".

 

Regards,

Anjur

Attached Files

•  Design_and_Analysis_of_Press_Vessel.pdf   1.78MB   175 downloads

[mady07]

Thank you Mr Ankur. can i get any company's specification for horizontal storage vessel? this will be very helpful for my overall project!!

 

Regards 
Mehedi
 

[ColinR33]

You should probably consider narrowing down what you will be storing in the vessel as the products you have mentioned are not compatible with each other; LPG is typically stored in horizontal bullets at atmospheric temperatures and therefore must be designed for the vapour pressure of the liquid being stored.  Alternatively you can stored LPG at atmospheric pressure in a refrigerated storage tank, which is usually a large concrete and metal vessel with a BOG (Boil Off Gas) system (typically a refrigeration unit to compress, condense and return any product that boils off due to ambient heat gain back to the tank).  The product feed to this type of tank also has to be refrigerated before entering the tank.  Liquid sulphur is typically stored in an atmospheric tank or concrete pit and has to be kept at a temperature above 240°F to stay in the liquid form so an external circulating heating system or internal steam coils are required.  LNG is stored in pressurized cryogenic storage tanks.

 

I would pick one product you wish to store and proceed that way.  If you are focusing on horizontal storage vessels just do an internet search for LPG storage, there is a lot of info out there.  Good luck!

 

Cheers,

Edited by ColinR33, 07 October 2013 - 10:21 AM.

[mady07]

Dear ColinR33

 

thank you for the suggestion. my project product will be used in a gas processing plant, so there will be sour gases or hydrocarbon liquids.what if i have to choose liquid sulphur to store in the horizontal storage vessel?

 

Let me know your view!

 

Regards

Mehedi

[Art Montemayor]

Mady07:

 

There is no normal need to store sufur as a liquid.  It normally is stored in piles as a solid - and shipped/distributed that way.  And even if you wanted to store it as a liquid, you wouldn't need a pressure vessel!  Common sense tells you that the vapor pressure of sulfur at its melting temperature is nil.   I've always melted it in concrete pits with steam coils.

 

ColinR33 is giving you the best advice: use common sense by finding out the saturated pressure corresponding to the storage temperature of your fluids.  Since you normally store at saturated conditions (like LPG), that determines if you require a pressue vessel or not. 

 

The paper that Ankur has furnished you is an excellent tutorial on what you have to consider when deciding on or estimating presssure vessels - with one major exception that it leaves out:  You may have to consider external pressure design (full vacuum) for your vessels.  Unfortunately, this is not mentioned in this paper.

[ColinR33]

Mady07,

 

Art is correct, sulphur is not normally stored as a liquid except as an intermediate stage before it goes to the sulphur block or if there is a specific process requirement.  I would suggest dropping the notion of storing liquid sulphur in a horizontal tank.  Ditto for sour gas - if it is a plant feed it normally comes in via pipeline to be processed to remove the acid gases and leaves via another pipeline, the acid gases are either further processed to produce elemental sulphur; compressed and re-injected into the reservoir, or burned in an incinerator.  They are not stored in a vessel.  Stick with a single purpose LPG bullet, butane sphere or a stabilized condensate tank.  Do not try to store multiple types of liquids that have significantly different properties (such as vapour pressure) in a single vessel, it is simply not practical (and in many cases unsafe!), that is why there are multiple types of storage vessels out there - each one serves a purpose for a specific product.

 

Cheers,

Edited by ColinR33, 07 October 2013 - 02:01 PM.

[jugal]

Hello Mr. Ankur,

                          In addition to the above blog, i also want to seek advice from you i am a mechanical engineer and currently working on one project i will brief you on that it is basically a hydrophore system which is normally used on ship platform for crew member's. I had designed a 1000ltr pressure tank as per asme sec VIII there will be one pump of capacity 15cum/hr@3bar(g). Pump cut in pressure will be 2bar and cut-off will be 2.8bar so now my question is on what pressure i should set the relief valve on vessel also my hydrophore will be charged with air pressure so will i have to charge it on 2.8bar? and how can i calculate the air consumption for the same as no information is available.Also i am attaching a p&ID for reference.

 

Regards,

Jugal N. Rana

 

Attached Files

•  p&id.pdf   183.65KB   84 downloads