The problem of linear expansion in long and straight runs of large diameter pipework, such as oil tankers, is one to which Brockington and Scott Ltd., of Llandeilo, Carmarthenshire, have brought specialist attention. They produce bellows expansion pieces in metal with bores from 15” up to 100”, and at present are carrying out experimental development work on bellows 19” bore made from 0.7mm thick FERRALIUM 255 (UNS S32550, Alloy 255, DIN 1.4507, ASTM F61) super duplex stainless steel plate because of its excellent resistance to corrosion, heat and fatigue stress and its ductility.
Brockington & Scott report that no difficulty has been experience either with argon butt welding or resistance welding, and that only slight modifications to forming techniques employed on 18/8 alloys have been required. Preliminary results of mechanical and pressure cycles tests to determine fatigue life and the efficiency of the bellows generally are reported to be encouraging.
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