Boiler buckstay system

Static structures (e.g. – buildings) – Sheetlike element assembled parallel to existing wall,... – For furnace or refrigeration

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52219, 5250602, 525731, 122 6A, 122510, 12223512, 122DIG16, 165 81, E04B 228, F22B 3724

Patent

active

055579019

ABSTRACT:
A buckstay system for a membraned-tube wall of a steam generator having a first wall section which meets a second wall section at an angle to form a corner. At least one buckstay extends across at least part of each wall section. A pair of tie bars are welded to each other at the corner, an end connection corner tie is welded at the corner to the pair of tie bars, and a pair of end connection buckstay brackets are welded to each end of the buckstays. A pair of pinned end connection links, an end connection corner tie and the end connection buckstay bracket transmit forces from one buckstay to the other wall's tiebar. Bending forces which tend to bend each wall section are transmitted to each respective buckstay which resists such forces. Each buckstay is provided with at least one new anchor assembly having upper and lower support plates welded to the outside surface of the tubes and engaged with each buckstay, two pads welded to and spaced from each other on top of each support plate, and a U-shaped plate welded on top of each pad to form an aperture. A first extended standoff nearest the corner is welded directly to one tie bar and its upper and lower ends are received within apertures formed by the U-shaped plates. A second extended standoff welded to a bumper plate and also to the tie bar moves in the space between the pads. A third extended standoff's upper and lower ends are received within apertures formed by the other U-shaped plates and is engaged to its associated buckstay.

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B&W Plant Service Bulletin PSB-28 2M P Jan. 1988-"Membraned Wall Corner Tube Failures", The Babcock & Wilcox Company. Entire paper.
Steam: its generation and use, .COPYRGT.1975, The Babcock & Wilcox Company, pp. 12-5, 12-6, 16-1 to 16-9, 17, 17-1.

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