Re: [MW:31883] Tubes expansion beyond drum thickness.

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.

On Sun, 27 Dec 2020, 10:31 Neeraj Yadav, <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%

On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:

What is  expansion % ?

On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:

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.

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