Material Specification for Product Methanol

[ARUNABH BERA]

Dear Experts

A Product Methanol tank of 3350 m3 capacity of Internal Floating roof tank with Nitrogen Purging has been envisaged in our project. Material of Construction for the Tank has been envisaged as SA516 Gr.60. Can we replace the same with IS 2062Gr.B Material

Regards

Arunabh

Project Co-ordinator

Engineers India Limited

[pgoswami]

Hi Arinabh,

 

All IS 2062 grades are classified as P1 Gr1 materials. For code stand  point  IS 2062 could be a replacement for SA 516/ Gr60 steel( also P1 Gr1 material). However it would be advisable to verify the the additional information for IS 2062 Gr B, such as the :

• manufacturing information and capabilities of the mill
• carbon equivalent and the base metal hardness and corresponding hardness of the weld and HAZ

 API  Bulletin 939E, 2013, has some word of caution for methanol service:-

T

he published literature and service experience with methanol is much more extensive and has shown for some time shows that methanol is a known SCC agent for steel. Water content, various impurities, temperature, and metallurgical condition of the steel determine methanol SCC susceptibility. You may know very well that residual stress/ excessive hardness  could trigger SCC.

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineer/Specialist

Ontario, Canada

pgos...@quickclic.net

pradip....@gmail.com

 

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Sent: Thursday, July 30, 2015 6:52 AM
To: Materials & Welding
Subject: [MW:23234] Material Specification for Product Methanol

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