Stand Pipes and Pads

Stand pipes and settings for carrying mountings shall be made of wrought, cast or fabricated steel.  These shall take the form of short stand pipes, pressed steel plate saddles, forged pads or pads cut from round rolled bar as may be most convenient and secured to the boiler by riveting or welding. Where short stand pipes are used they shall be of solid forged, fabricated or cast steel. They shall be carefully bedded to the shell before attachment and where riveted the rivets shall be so pitched as to ensure a tight joint. The jointing faces to which mountings are to be bolted shall be machined. Pads shall have sufficient thickness to allow the drilling of stud holes for mountings without the inner surface being pierced and the length of the screwed portion of the stud in the pad shall be not less than the diameter of the stud.