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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