A Method Of Bending Long Tubes For Superheater And Reheater Coils In Steam Generators Without Tungsten Inert Gas (Tig) Welding.

Abstract: In the high pressure boilers used for power generation requires heat transfer coils named as platen super heaters and re heater coils. In the manufacturing of such coils made of alloy steels and Stainless steel has total length ranging from 18m to 22m with outside diameter ranging from 38.1mm to 76.0mm. A tube bending machine for bending such high length tubular work piece (4) and a roller (1) and rail (2) arrangement to support the work piece while bending are disclosed. The curvilinear support system has a rail (2) arranged in a semicircular fashion around the bending machine supported on height adjustable stands (3). Work piece (4) is carried over the railing with the help of a trolley (1), which accommodates friction free movement along and perpendicular to the direction of the railing. This enables the bending machine to bend circuits with overall length of 17 to 22m without any bending defects. By this method, all TIG joints were eliminated in the manufacture of superheater and reheater coils. A bending former (5) is disposed on a platform (6) carrying the work piece. The work piece is placed on the trolley (1) which moves over a semicircular path of the rail producing the required bend tube. The rail returns to the home position (H) by gravity of the rear side of the rail provided with a taper downwards. Fig.1

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents

Search Strategy

ERegister / Renewals Ceased