Vijay,
Is your query on the storage of anhydrous ammonia? Then you need to incorporate some additional design requirements in your system:-
· Design code for vessels and exchangers or other static equipments:-ASME SecVIII, DIV-1 or BS-5500/PED directive. Additionally the equipments shall be PWHT, and if the design below -330C materials and welds shall be impact tested to UCS-66.
· Piping design codes ASME B-31.3 or equivalent European design codes. Materials requirements shall be same as the static equipments.
· Addtionally there should be a comprehensive and periodic inspection program for all the equipments.
Usually the design codes as mentioned above are popular choices for equipment design. For storage and handling CGA G-2.1 or ANSI K 61.1 are followed commonly in North America. However the additional requirements on design and fabrication following NACE document (5A192) would be good to incorporate. I have attached the extract from this document below.
I have attached some articles on anhydrous ammonia, hope it would be of interest to you, especially the one from National Board.
Thanks.
Pradip Goswami, P.Eng.
Welding & Metallurgical Engineer/Specialist
Email-pgoswami@sympatico.ca,
NACE International Publication 5A192 (2004 Edition), Integrity of Equipment in Anhydrous Ammonia Storage and Handling
Vessel Design
The Compressed Gas Association has issued a standard as ANSI K 61.1, "Safety Requirements for the Storage and Handling of Anhydrous Ammonia," (or CGA G-2.1) for use during construction of anhydrous ammonia storage vessels. This standard includes design and construction details regarding joint efficiency, post weld heat treatment,
and type of steel.
That standard states, "An exception to the ASME Code requirements is that construction under Table UW 12 at a basic joint efficiency of under 80% is not authorized." It also states, "The entire container shall be post weld heat treated . . . as prescribed in the ASME code."
"Steels used in fabricating pressure containing parts of a container shall have tensile strength no greater than a nominal 70,000 psi (480 MPa)." A British code of practice also recommends restrictions on the yield strength of materials used for anhydrous ammonia storage. Fabrication defects can act as sites for initiation of ammonia SCC because of stress concentration.
Shot peening has been suggested as a technique for stress modification but no practical experience has been reported. An isolated failure in a piping system has been reported. These systems are not generally stress relieved.
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Kadam Vijay (Mumbai- Piping)
Sent: Tuesday, April 27, 2010 9:27 AM
To: materials-welding@googlegroups.com
Subject: [MW:4964] Anhydrous Ammonia Code
Dear All,
In one of our ammonia project as per client's document we have to follow the requirements of Anhydrous Ammonia code.
Can someone guide me about this code. What all are the requirements of this Code ??
Thank you for your kindly help.
Kind Regards,
Vijay Kadam
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