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dricardo10
Participant

Join Date: Oct 2013
Posts: 2

MDMT and Impact Test in A36/6mm Storage Tank

10/27/2013 1:22 PM

Hi everybody!
There is a Storage Tank for water and they are asking me for the MDMT, but i dont know how to read the Table 4.1 in API650. They want to know this info for determinate Impact Testing is required or not?

Fluid: Water (6°C Aprox)
Min. Air T°: 0°C
Max Pressure of Vessel: 3 PSI(storage tank)
Material: A36- th=6mm

So.... is required impact test in this case? What is the correct way to read the table from API650 4.1? Whay about the equations 4.3?

Please I need your help. Thanks!!
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
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#1

Re: MDMT and impact test in A36/6mm Storage Tank

10/27/2013 2:03 PM

How about quoting the relevant sections of API650, so that the rest of us can read them?

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passingtongreen
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Join Date: Aug 2009
Location: Glen Mills, PA.
Posts: 2385
Good Answers: 114
#2

Re: MDMT and impact test in A36/6mm Storage Tank

10/27/2013 2:58 PM

Minimum Design Metal Temperature.

http://www.gowelding.com/weld/fracture/impact.html

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Anonymous Poster #1
#3

Re: MDMT and Impact Test in A36/6mm Storage Tank

10/27/2013 11:22 PM

Are you sure that table 4.1 discuss about MDMT and thickness? Which edition of API 650 is your reference? If possible could you attach that table here for a deeep analysis?
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dricardo10
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Join Date: Oct 2013
Posts: 2
#4
In reply to #3

Re: MDMT and Impact Test in A36/6mm Storage Tank

10/28/2013 1:43 AM

Yes, in other edition of API650 the table is 2.1 (Minimum Permissible Design Metal Temperature for Materials Used in Tank Shells Without Impact Testing)

my question is 1.how can I stimate the MDMT for that conditions on the storage tank? (air tempreature 0ªC, and water=6ªC)
2. For that conditions is necessary impact test?
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Anonymous Poster #1
#5
In reply to #4

Re: MDMT and Impact Test in A36/6mm Storage Tank

10/28/2013 2:02 AM


Any bet ? ROFL
Dude, first read the standard carefully and ask questions Otherwise attach the table for a deeeeeep analysis
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#6

Re: MDMT and Impact Test in A36/6mm Storage Tank

10/28/2013 3:21 AM

According to your data, the lowest temperature to which the tank would be exposed is 0°. The code may require some "cushion" such as a designated MDMT of somewhat less, such as -10°C. Then the table(s) should tell if impact testing is required.

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