Tube pull out load test for heat exchanger

abc123 · **Joined:** Fri Nov 06, 2009 7:02 am **Posts:** 40

Where are the calculations for "Tube pull out load test for heat exchanger" in section VIII-1.Or is there any other calculations which is equivalent e.g. APP-A

niraj_kuwait · **Posted:** Fri Nov 06, 2009 8:54 am

Appendix -A , A-2 gives you maximum allowable Axial Loading.
And actual load on whcih It breaks provided by Laboratry.
What is confusion ?

srinivasan · **Joined:** Tue Jan 27, 2009 6:33 am **Posts:** 79

I would like to add use appropriate factor if no test is conducted by you to arrive at the allowable load.

Actual load will come from your design calculations (tube stress X area)

With regards

abc123 · **Joined:** Fri Nov 06, 2009 7:02 am **Posts:** 40

niraj_kuwait wrote:

Appendix -A , A-2 gives you maximum allowable Axial Loading.
And actual load on whcih It breaks provided by Laboratry.
What is confusion ?

Thanks niraj
What about U Tube heat exchangers? As App. A excludes U tube heat exchangers.
Thanking u in anticipation!

niraj_kuwait · **Posted:** Fri Nov 13, 2009 7:13 am

A-2 ,Starts With Words "Other then U tube construction......."
Meaning -- There is No considerable Axial Loading in U tube........
B'coz-- It's Shape ( U ) it self will take care Linear expansion during operation so No direct load will come on the Tube to tube sheet weld.

Hope it is clear

abc123 · **Joined:** Fri Nov 06, 2009 7:02 am **Posts:** 40

OK, thanks for yor kindness.
I will try to explain my actual problem.
I am designing a U Tube heat exchanger. Is there any calculation to check the tube expansion in tube sheet (for tube to tube sheet joint).The term "Tube Pull Out Load Test" is used to check that joint.The designer calculates the value of Tube Pull Out Load (we calculate that value using a method given in a heat exchanger design hand book by "Singh & Soler") then that tube is pulled out in shop at a certain load.if the actual pull out load is greater then that calculated by the designer then its OK.
I want a reference from ASME for above test.Also it seams that the above test is nothing to do with the type of heat exchanger i.e. fixed or U tube as it checks the expansion of tube in tube sheeet.

Regards

srinivasan · **Joined:** Tue Jan 27, 2009 6:33 am **Posts:** 79

abc123:

Dear friend
If I understand correctly, you are looking for stresses under rolling: loading, unloading, residual stress etc covered in the book by K.P.Singh and A.I.Soler.

ASME appendix is totally different which covers ALLOWABLE axial load but as a function of tube to tubesheet joint . i.e if you have one groove or two grooves in tubesheet for rolled joint (even joints without grooves are covered). Appendix gives an emprical relation.

The book has covered detailed stress analysis of tubesheet (yielding under rolling, residual stress under subsequent unloading etc); To my understanding using the procedure or formula given in book by Singh and Soler is not mandatory.

Some expert may probably will make it more clear for us

With regards
SRINIVASAN

abc123 · **Joined:** Fri Nov 06, 2009 7:02 am **Posts:** 40

srinivasan wrote:

abc123:

Dear friend
If I understand correctly, you are looking for stresses under rolling: loading, unloading, residual stress etc covered in the book by K.P.Singh and A.I.Soler.

ASME appendix is totally different which covers ALLOWABLE axial load but as a function of tube to tubesheet joint . i.e if you have one groove or two grooves in tubesheet for rolled joint (even joints without grooves are covered). Appendix gives an emprical relation.

The book has covered detailed stress analysis of tubesheet (yielding under rolling, residual stress under subsequent unloading etc); To my understanding using the procedure or formula given in book by Singh and Soler is not mandatory.

Some expert may probably will make it more clear for us

With regards
SRINIVASAN

Well to make it simple, the problem is "How to qulify rolled/expanded tube to tube sheet joint according to ASME"

Tube pull out load test for heat exchanger

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