Instrumentation for Anhydrous Ammonia Tank

Instrumentation is rarely made in carbon steel, as carbon steel deteriorates over time. Such an instrument would soon become useless.

Look at corrosion resistance charts to determine material/fluid compatibilities. One such chart is the Cole-Parmer materials compatibility database, which any internet search engine will find.

Ammonia is not corrosive to carbon steel. For vessels, SA516-70 is a common plate, SA285-C has been used; and smaller vessels can be made of pipe, such as SA53-B or SA106.

Valves can be made of steel bar stock, cast ductile iron, etc. (but not plain-jane cast iron). Trim is likely to be SS; PTFE and neoprene are good elastomers. Gate and butterfly valves are not generally used; globe and ball valves are most common.

Wetted instrument components and tubing are commonly SS, more from the standpoint of external (atmospheric) corrosion rather than internal.

Hi Kazengg

By this time you have your answer from Tornado.For ammonia service you can very much use carbon steel.For both ambient temp storage (Pressurised) or refrigerated storage(Atmospheric) you can use SA516-70 steel plate.

Only thing you should remember that you should not use Zn or Cu alloys in ammonia service.

For instrument tubing you should use stainless steel.

kazengg, I would like to inform you of the following:

1.- If you are not sure of the materials, pelase hire or contract a materials engineer, so that you can avoid major problems in the future. Doing engineering and construction without having a proper background can lead to major problems, even legal problems.

2.- Check the corrosion tables and other information and see the link here http://www.rmtech.net/Anhydrous%20Ammonia.htm.

3.- The product based on concentration can be deadly so the materials of construction are very important, and make sure that as little water as possible gets in contact because then it can be very corrosive.

4.- Most instrumentation uses stainless steel and even with plastic coated elements, so the instrumentation should not be a problem.

Again, handling and working with toxic chemicals can lead to all kinds of problems, so hire experts to design it, or of course enjoy the difficulties.

You sound unfamiliar in a potentially dangerous industry so "Do the Google on the internet machine". You can find a wealth of information through these companies:

Vilter, Danfoss, Refrigerating Specialties (Parker), Shank, Phillips, Cornell, Viking, Mycom, FES, Sporlan, Hansen Technologies, York, Dunham-Bush, Allen-Bradley, Morris & Associates, Vogt Evapco, Frick, GEA, and Henry. Also check out these organizations; IIAR, ASHRAE, and RETA