API 650 Storage Tank Materials & MDMT

[Shooze]

I am new to the Oil & Gas Industry. I am hoping someone can explain some issues I am having with material specification and MDMT.

I am trying to specify material for a storage tank. The specified MDMT is -45 deg.C, I want to build this tank with carbon steel. The tank is design to be atmospheric and use to storage steam condensate

Is it neccessary based on the MDMT to use low temp carbon material to build this tank or can I go with reg. temp carboon steel?

If I go with reg. temp carbon steel is there certain impact test requirements for certain thickneses?

Any suggestion on this issue would be appreciated.

Thanks!

 

[SJones]

By the title, it is assumed that you are using API 650. Clause 4 of API 650 states very clearly which material standards are applicable, whether they require Charpy testing or not, and, if they do, how to go about it.

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdoweb/

 

[JoeTank]

In API-650, all material with a DMT below -40F require impact testing. Looks kinda simple for your case.

Joe Tank

 

[MJCronin]

shoes..

Go to a well established tank fabricator who is experienced and simply specify "carbon steel selected as per API-650 guidelines"

You do not have to be more specific than this, additionally he may be able to reduce his bid based on flexibility you are giving him in the selection of materials.

Sometimes he can get a break on costs when materials are ordered by combining different projects..

My opinion only

Consider posting this question on

http://www.ast-forum.com

-MJC

 

[tifoed]

I am designing and sizing,storage tanks with heating coils for the storage of wax. the idea is to keep the wax at a specific temperature range by heating it.Can someone help by recommending wnere i have to start in order to be able to size the heating coil, and taking into account heat lossesn to the surrounding even though the tank will be insulated.

 

[MJCronin]

tifo..

I recommend that you start by beginning a new thread

 

[ikarga]

Working as a project manager, need to know sometimes current prices for piping, steel profiles, sheets, valves...in one word - piping material prices.
Is there any link to price lists for above?
Thanks!