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Anonymous Poster #1

Tube to Tube Sheet Fabrication

01/27/2013 2:04 AM

Frienz,

What is the correct fabrication sequence for tube to tube sheet for heat exchanger?If both are OK,then what is the pros and cons of two sequences. A detailed opinion from experienced people on this subject expected.

Sequence-I

1.Clean tube sheet hole and tube surface.

2.Insert the tube in to tube sheet hole.

3.Expand the tube to tube sheet by mechanically.

4.seal weld the outside diameter of the tube to tube sheet surface.

5.Dye Penetrant test and leak test

Sequence-II

1.Clean tube sheet hole and tube surface

2.Insert tube in to tube sheet hole.

3.Seal weld the outside dia of the tube to tube sheet surface by mechanically.

4.Expand the tube to tube sheet surface.

5.Dye Penetrant test and leak test
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dhayanandhan
Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#1

Re: Tube to Tube sheet fabrication

01/27/2013 6:24 AM

Dear Friend,

Sequence -II is correct. Just expand the tube and test for leak. This will help you to replace the tube later. Welding means, removal of the tube will be problem.

2nd part of the Question Then WHY 2 SEQUENCES.?

I am not sure, it may be adopted in Nuclear Plant Dump Tank, which is more critical application. Let us wait for comments from other CR4 Members.

DHAYANANDHAN.S
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Anonymous Poster #1
#4
In reply to #1

Re: Tube to Tube sheet fabrication

01/27/2013 7:05 AM

I really don't know when seal welding and strength welding (partial penetration weld) is required to close the tube to tube sheet end.As you said,I have seen one boiler water drum with expanded tubes (with two projection of tube material in to two grooves in drum tube sheet hole after forming) with out seal welding during a repair.Hope, some experts in CR4 will explain it in detail.
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MKA
Active Contributor

Join Date: Jan 2013
Posts: 12
#2

Re: Tube to Tube sheet fabrication

01/27/2013 6:29 AM

The best sequence is to expand 80% before welding and then complete the 100% after welding. The expansion after welding will also work as stress relieving
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Anonymous Poster #1
#3
In reply to #2

Re: Tube to Tube sheet fabrication

01/27/2013 6:57 AM

Hi Frienz, thanks for the valuable inputs and the replies so far are highly informative.Other CR4 members opinion on this subject expected.
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Anonymous Poster (2); dhayanandhan (1); MKA (1)

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