Monday, September 20, 2010

Re: [MW:7099] TUBE TO TUBE SHEET EXPANSION

Hi,
Please find below the formula for tube expansion percentage.With this you can fix the max.allowable expansion percentage in relate to the thickness of the tube after expansion. also you can find the thickness of the tube after expansion by using this formuls(Tube ID after expansion-Tube OD / 2).In no case it will not be less than the design thickness of the tube.
The tube longitudinal and compressive stress shall be calculated  by TEMA RCB7.23 or 7.24.
 
Formula.
K = ((d2-d1) - (H-D))/2T X 100%
 
d2 = (H-2T+(Kx2T)/100)
 
Pls.see the attached file of sample calculation sheet.In this sheet you can input your datas and you will get the thickness reduction and tube ID after expansion.
You can fix the K from 3% to 15% or what will be the minimum and maximum expansion percentage you fix.
 
Where,
K-Expansion percentage,decrement of tube thickness
T-Tube wall thickness
d1-Inside diameter of the tube before expanding
d2-Inside diameter of the tube after expanding
D-outside diameter of the tube
H-Inside diameter of the tube sheet hole
 
Thanks & Regards,
 
(karthik)
 
You can just make this in an exel sheet

Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Sun, 9/19/10, manoj john <manojacgnr@gmail.com> wrote:

From: manoj john <manojacgnr@gmail.com>
Subject: [MW:7094] TUBE TO TUBE SHEET EXPANSION
To: materials-welding@googlegroups.com
Date: Sunday, September 19, 2010, 3:29 PM

Dear All,
 
I have to do tube to tube sheet expansion.  This is as per TEMA and joint is double groove full expansion.  My question is from where i can get a reference from the code for the percentage of expansion.
 
Thanks in advance.
 
Best Regards.
Manoj.
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