API 650 Storage Tank

Never heard of PWHT being performed per API 650. I mean look at the amount of HT area,

the HT would cost many times the material (A36) and the initial welding.

Yes Of course. The name is not PWHT, the Api 650 name is THERMAL STRESS RELIEF. Please read point 5.7.4 (All). Be carefully with the manhole reinforcement. I think that you are going to need Local TSR. A36 is classI.

WP

As per the available information from OP, how can you say that ASTM A36 material is Group-1 listed material in API 650? I am curious.

Yes, Do you have the API std 650? I'm using API_650_2007_AD3_2011. There you can find the materials groups (No Class, sorry). In Tables 4-4a and 4-4b. A-36 correspond to Group I.

And, yes, you (OP) have to TRS The manhole with the corresponding reinforcement.

Also see API 650 Parr. 5.7.8.4

WP

Could you educate me a little - I've been out of petrochem a while (>15 years )?

a. is PWHT required because of combined thickness of shell and reinforcement? Would other reinforced nozzles require PWHT?

b. how would A516-70, say, compare to A36, requirement-wise?

No elaborate response required, I just don't have standards available to read any more.

Btw, the above mentioned info. found in API 650, 12 th edition, March 2013 standard.

Let me knw your e-mail , so that I can send it asap.

Sir, here is my e-mail: and . I will greatly appreciate if you send me a copy as you promised.

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Why not just buy a copy? After all, if a facility is intending to construct to that particular standard, it is going to need a legitimate copy on the shelf and ready for use!

posting email addresses is not allowed per CR4 rules. PM them with your contact info.

thanks for the offer, but isn't this copyrighted material?

it's nigeria... they aren't laws so much as suggestions there....

Very Interesting one and I would like to participate in this discussion.It's my pleasure to educate you. If any error found in the screen shots, original author of the document is responsible.

Thanks, what is the source?

ASTM A36 material is listed in Group-I and Group-II in table-4-4a (US Customary unit) or 4-4(b) (SI Unit). Note 2 and 3 are applicable for Group-I material. Note 2 and 5 are applicable for Group-II material. chemical composition is not available in this discussion. However, what about 22mm material? I am curious.

1. If you are building a 500,000 BBL API650 tank, surely you have a copy of the standard to reference?

2. I don't think you would be required to PWHT because of the thickness, but the standard would tell you. However, there may be other considerations that would require PWHT.

3. PWHT of the welds should certainly be possible, using resistance heaters. I think it is required on storage spheres quite often. The floor might require special consideration to prevent damage to the base material.

4. 'what are other possibilities to obtain waiver . . .', first you need to have a conversation with the client to understand why they specified PWHT.

There is no local PWHT in storage spheres. local PWHT will extensively distort the equator plates.Internal firing is generally used.there are plenty of people did this work in the world before.So, it is not a bigg deal

More pics

It sounds as though the PWHT has been omitted and the supplier is trying to wriggle out of a contractual obligation to do it. That will be fun. Not.

Deadly fluid? Like, water (causes drowning) or air (causes injury and death by flying debris if not adequately contained)? :-)

So the answer to the first question is "yes, if you want to be paid for it". Question 2 is answered in the standard and question three is inapplicable. Probably.

Not required. unless the thickness exceeds 1". Check the reinforcement plates at the nozzles, still can get away by using the controlled weld deposit procedure during welding.