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sakthi
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Join Date: Nov 2008
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bank tubes

04/20/2009 7:38 AM

hi, can anybody give the reason behind in expanding the boiler bank tubes which are connected to the drum in the bidrum boiler.
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PWSlack
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#1

Re: bank tubes

04/20/2009 7:51 AM

Er, so that they don't leak between the tubeplate and the tubes?

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sakthi
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#2
In reply to #1

Re: bank tubes

04/20/2009 7:55 AM

is there any other reason, why we don't weld in that portion
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sakthi
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#3
In reply to #1

Re: bank tubes

04/20/2009 7:57 AM

is there any other reason.why we don't weld in that portion
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PWSlack
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#4
In reply to #3

Re: bank tubes

04/20/2009 8:01 AM

Er, so that the expanded tube and the tubeplate can be easily parted, to that the tubeplate doesn't need to be replaced as often as the tubes do, perhaps?

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sakthi
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#5
In reply to #4

Re: bank tubes

04/20/2009 8:07 AM

can you please clarify theoretically. is there any calculation how much to be the tube expanded.its my opinion that it may due to the differential thermal expansion.also it may provide easy for repairing the bank tubes if any leakage found.
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sakthi
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#6
In reply to #5

Re: bank tubes

04/20/2009 8:34 AM

also is there any standard in calculating the mandral size for expanding the tube
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PWSlack
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#7
In reply to #5

Re: bank tubes

04/20/2009 9:27 AM

Er, it needs to seal at the test pressure. An experienced boilersmith knows how much expansion to give a tube. Too little and it won't seal up. Too much and the tubeplate moves around, possibly unsealing adjacent tubes.

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sakthi
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#8
In reply to #7

Re: bank tubes

04/20/2009 9:38 AM

sorry i didn't got the actual solution for my problem
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PWSlack
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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#9
In reply to #8

Re: bank tubes

04/20/2009 9:48 AM

Then speak to a boilersmith.

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