7 replies to this topic

[Mahdi1980]

Dear Friends,

I am designing Pressurized storage tank for Ammonia which is a 20 m³ insulated Iso-tank operating at 17~20 barg equipped with the required facilities for loading and unloading the liquid Ammonia of the tank.

I have some information about designing of the tank and instruments but not enough.

Please give me a summarized document about whatever required for designing the tank and safety systems including P&ID.

Edited by Mahdi1980, 24 May 2016 - 05:53 AM.

[breizh]

Hi ,

Consider the resource attached .

 

I remember using DP transmitter with capillary to measure the volume of NH3 liquid . Of Course Pressure transmitter  is needed .

Aboout safety , you need to know the risk associated with a leak , meaning you need to do a mapping with relevant model to ensure the safety of neighborood  .

 

More to come from others

 

Good luck

 

Breizh

[latexman]

Mahdi1980,

 

Ammonia storage tanks are regulated in U.S., mainly due to ammonia being a chemical needed to manufacture some illegal drugs.  The regulation has several security measures.  If your tank is not in U.S., consider the regulation a guide:

 

https://www.osha.gov...DARDS&p_id=9757

[Art Montemayor]

Mahdi:

 

You are dealing with a pressure vessel of the following approximate dimensions:

• Type = horizontal, cylindrical
• Heads type = 2:1 Ellipsoidal
• Outside diameter = 2.4 meters
• Tangent/Tangent length = 5 meters
• Liquid ammonia max level height = 1.7 meters
• Total vessel length = 6.2 meters
• Total liquid ammonia partial volume = 20 cubic meters
• Liquid ammonia internal pressure = 17 - 20 barG

You state you are storing liquid ammonia in this relatively small pressure vessel.  I have to assume you mean it is pure, saturated liquid ammonia since you fail to identify the conditions other than the pressure(s).  Why you are storing relatively hot liquid ammonia (and insulating it as well) is unknown, but I'll go along with what you state.  Refer to the attached workbook to see the thermo properties of the stored ammonia.

 

If my assumptions are correct, then all you need is an ASME VIII code designed tank or equal.  Usually, an existing LPG storage vessel can be applied for this type of service.  But you have to do a re-rating of the vessel.

 

As Latexman notes, there are existing standards, codes, and regulations in this country (USA) for storing ammonia liquid.  I presume the same applies in your country.  Go to:

 

https://www.tannerin...nh-ammonia.html
https://www.osha.gov...DARDS&p_id=9757
http://laws-lois.jus....R.C.,_c._1146/

 

for detailed information on ammonia storage.  What you are asking for is a finished engineering product (P&ID, safety systems, etc.).  This will cost you for the engineering services.  If our members want to give it to you, they are welcomed, but our Forums cannot accept any liability or responsibility for any results - whether good or bad from such services of others.  We will help you with advice and helpful comments but we don't sell or give engineering services that will be applied under our responsibility.  Our Forums are a free service of helpful information and we don't sell finished engineering.

 

 Saturated Ammonia Thermo Properties.xlsx   28.71KB   44 downloads

[Mahdi1980]

Dear Briezh, Art and Latexman

Thank you for all replies.

Briezh:

I saw your attachment, however it does not describe well about the pressurized tank and the procedure of loading from truck to the cited Iso-tank. It is about cryogenic one. If you have more information about detail design of such system, I appreciate to send me.

 

Latexman

your link is helpful. Tnx.

 

Art:

Your data are useful. I understand what you said about tasks of the forum and respect them.

Of course, I apply the useful information and experiences that members share in this forum and as a process engineer I try to design my case considering all the requirements  for the vessel to operate in  safe conditions and high performance.

As you know, for storing liquids such as ammonia most of the time especially in small capacities , horizontal pressurized storage tanks are preferred to the cold ones due to low cost of construction and utilities.

So, I am considering the pressurized tank to store the Ammonia in ambient temperature and about 20 barg.

However, I need more information about loading and unloading concerns to have a best operation.

Thank you

Edited by Mahdi1980, 25 May 2016 - 08:03 AM.

[breizh]

Hi ,

Typical equipment I was using for NH3 .

All you need is there for unloading and transfer to ST

 

Good luck

 

Breizh

[breizh]

Hi ,

Additional resource :http://www.hse.gov.u... storage design

 

Hope this helps

 

Breizh 

[Mahdi1980]

Hi Breizh,

 

Useful references and link.

Thank you. Appreciate for your help.

 

Mahdi