Permissible Tubesheet Construction from Plate Material

The machinery capable of bending 70 MM thick plate into a 3000 MM tube is rare in most basements.

click these image links and select from those that can deal with the required length of 70 MM plate and buy the product from them.

Or raise $1 Million to buy and build it for yourself

In fact few companies are capable of this.

Thanks for yr reply .

But i think u have not understand my query .

In Shell& Tube type Fixed type heat exchanger ; there is 2 nos End plates ( which are called Tubesheet) ; this Tubesheet do not needed rolling/bending . see the image

No, a tubesheet is the plate where the tubes go through.

It's been a while since I was involved in ASME,... But TEMA had a good design requirements. The OP should Start there.

Btw, back in the 90's there was talks about TEMA and ASME combining. But I don't think anything became of that.

TEMA and ASME still exist as separate organizations with different goals: manufacturing standards and design, respectively. Until the late 1990s, TEMA had the method for calculation of tubesheet thickness. ASME made its own method mandatory, which superseded TEMA's method.

Thanks for the update,...

My knowledge of ASME was from the 90's. At the time, ASME didn't have much for tube sheet construction, while TEMA did, such as hole spacing, minimum layout (Triangular, Horz. Vert., Distance) and such, I asked our ASME AI when he was reviewing, and he mentioned about the possibility of them combining because he did say, ASME lacked this.

I'm glad, ASME has finally developed their own mythology.

Mythology? Or methodology? Or is there any difference?

what a coincidental mistake... ^{(insert embarrassed emoticon here because my computer can't the last 2 days)} ... because at the time..... no difference....

At the time, I scoured ASME and could not find anything about tube sheet METHODOLOGY... so yes, mythology was not my original intent, but it was the correct one.

keep calm and carry on!

I haven't been involved with either TEMA or ASME for a while, and I don't know what mergers or overlaps might exist by now. In my pressure vessel days, the shop where I worked did mostly simple designs for use in our own refrigeration system contracts.

same here.... Division VIII Section 2.... or was it 1. we designed and fabricated shell and tube heat exchangers and pressure vessels.

Along with power piping authorize stamps were U, R and PP

http://www.thermopedia.com/content/1182/

http://www.tema.org/highlig8.html

http://www.slideshare.net/accelerate786/heat-exchanger-design-26373766

So far I have seen availability of 3-inch thick x 60-inch wide plates, which would entail one weld seam in the tubesheet.

There are some plates up to 120-inch width, but I'm not sure about the 3-inch thickness. I didn't look at very many sources, though.

Tell us what "code" you are using.

Tell us why you are asking here, when this seems to be your job.

Why is the statement, "I have to fabricate a tubesheet" outrageous?

Have you tried to find the applicable specifications yourself, before coming here?

What is your education/experience level?

Tell us why you think you may be capable of performing this task when you know nothing about it.

Good luck.

Start by involving the Engineer/Surveyor from the company that is to inspect with a view to securing burst/collapse indemnity insurance cover for the finished equipment. Do this by telephone. This sort of individual has all the resource needed to assess a structure to hand.

Omio ...

You seem to be involved in Heat Exchanger fabrication with a massive SS tubesheet as your first problem.

Yet your questions imply that this is the first tubesheet you have ever fabricated. Is that true ?

Regarding your questions:

1) "minimum permissible plate width" --- This implies that this large diameter tubesheet can be fabricated from a group of plates. Many HX design codes and standards do not permit this construction and require forged tubesheets. Are you familiar with the TEMA, EN and ASME code requirements ?

2) "as well permissible welded Tube-sheet from plate?" -- Do not understand

3) "NDT & Testing requirement as per code?" --- which code ?

You cannot play the game until you have read the rulebook ....

IMHO, it is difficult to beat the prices and overall quality of the Korean and Chinese tubesheets sold and used in fabrication of TEMA code shell & tube HXs. The USA vendors of these components have all been run out of business.

Omio,

I can't advise on whether having a weld in the tubesheet is a safe construction method for your particular service. That is between you and your customer.

In ASME VIII-1, paragraph UW-3(a) defines "any butt-welded joint within a flat tubesheet" as a category A weld. This indicates that ASME permits welds in tubesheets. As ASME VIII-1 Section on tubesheet design, UHX, doesn't use a weld efficiency (i.e. assumes an efficiency of 1) the rules for full radiography per UW-11(a) should be followed. UW-11(a)(2) and UW-11(a)(7) also apply.

I don't know about other codes.

I think that a circular disc that is 3000 mm (118-1/8") x 70 mm (2-3/4") is within the capability of several manufacturer's around the world. It won't be in a warehouse.

ASME VIII-1 doesn't have a size limit.

TEMA Standards give rules for construction up to 100" (2540 mm). However, TEMA is not a code, but a manufacturing standard and can be modified. RCB-1.11 gives the size limitations and guidance for units exceeding the scope.

Lawrence