Tubes expansion beyond drum thickness.

[Neeraj Yadav]

Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

[Vishwas Keskar]

What is  expansion % ?

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[Neeraj Yadav]

Min-8% to Max-20%

[Prasad Ghanekar]

Expanded beyond shell thickness is not acceptable. There will be a notch formation on tube at edge of shell. Tubes are likely to be sheared at this point.

Prasad G.

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[Vishwas Keskar]

20 %  expansion - seems on higher side. Normal is @8-12 %

Advice - 

Check thinning  and find out tube thickness .

Check this much thk after thinning this much  is acc to Engineering .

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[Kannayeram Gnanapandithan]

there is bulging immediate outside drum thickness, is it acceptable

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

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CONSULTANT-WELDING & QUALITY

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[Neeraj Yadav]

Any reference for expansion beyond drum thickness is not acceptable as per ASME Standards/IBR.

This is specifically mentioned in TEMA that expansion length shall be the tubesheet/drum thickness minus 1/8" (3.2 mm) and no expansion of tubes beyond drum/tubesheet thickness is acceptable.

However these standards are being followed for Heat exchangers (Heaters, condensers, coolers & re-boilers) only and our boiler is designed as per ASME Sec-1 and IBR.  

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Thanks & Regards

Neeraj Yadav

M.No.:+91-9457487464, 7017375440

[Vanchinath S.A.]

Please refer to literature on boiler tube expansion on www.venus- boiler. com

Regards

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