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Specific Strategies to Repair the Bulge on the Shell of a HRT Steam Boiler


All repairs need to be acceptable to the governing code jurisdiction (this sort of as NBIC), therefore all methods of repair will have to have prepared acceptance from the Main Inspector or Approved Inspector. The guideline to flush patch can be received from RD-2060a Flush Patches of NBIC.

Carry out hardness check (DT) on the bulge region to ascertain extent of defect. Mark out the boundary line of the defective section to be cut out based mostly on appropriate tensile toughness attained. Use Vickers Hardness check (HV) to check for the steel toughness of carbon metal. The process of repair is known as “flush patch”, which indicates the shell is cutout around the failure in elliptical or rectangular, and a piece of new boilerplate rolled to correct curvature is inserted with the edge of authentic shell and patch butt-welded. For rectangular shape, present precise radius as sq. corners shall be prevented.

Refer the manufacturer’s blueprint on the product specs of the shell and the patches shall be made from the material that is equivalent in good quality and thickness to the primary product. The edge shall align without overlap. Weld preparation to be double “vee” with an included angle of 60o to 70o. The gas tungsten arc welding (GTAW) shall be used for the first move signing up for the patch to shell. The equilibrium of the weld shall be guide shielded metallic arc welding making use of low hydrogen electrodes verified to ASME Code Sect IX.

Weld the inside initially, then back again gouge on the exterior. Grind the seem metal right before continuing the welding on the exterior. Grind flush the available floor, and after completion of welding, visually verify for weld undercut and repair if vital. Refer the manufacturer’s blueprint on the NDT made use of through building, and commonly the weld on flush patch of shell is 100% radiographed. Acceptance of weld is in accordance with ASME Code or BS 2970 code. Article weld heat remedy (PWHT) is to be carried out to alleviate the residual strain on the warmth influenced zone (HAZ). Carryout hydrostatic check on the boiler. Exam stress shall be 1.5 moments the style stress. The keeping time is 10 minutes.

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