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SOCKET WELDING FLANGES were initially developed for use on small size high pressure
piping. When provided with an internal weld, their static strength is equal to, but
their fatigue strength 50% greater than double welding slip-on flanges. Smooth bore
conditions can readily be attained (by grinding the internal weld) without having to
bevel the flange face and, after welding, to reface the flange as would be required
with slip-on flanges. The internally welded socket type flange is popular in chemical
process piping for this reason.
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