Standards 39: Threaded & Socket Welded Fittings – Pressure Classes and Schedules

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Threaded & Socket Welded Fittings – Pressure Classes and Schedules Pressure classes, schedules and weights of pipes for threaded & socket welded fittings

Standard (STD), Extra Strong (XS) and Double Extra Strong (XXS) Schedule – Numbers assigned to different wall thicknesses of pipe (i.e. schedule 80)