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ASME B31.9-2020 pdf download

ASME B31.9-2020 pdf download.Building Services Piping.
gasmetalarcwelding(GMAW):anarcweldingprocessthat employsacontinuoussolidfillermetal(consumable) elec- trode. Shielding is obtained entirely from an externally supplied gas or gas mixture. (Some methods of this process have been called MIG or CO 2 welding.) gas pocket: see porosity, the preferred term. gas tungsten arc welding (GTAW): an arc welding process that employs a tungsten (nonconsumable) electrode. Shielding is obtained from a gas or gas mixture. Pressure mayormaynotbe used andfillermetal mayormaynotbe used. (This process has sometimes been called TIG welding.) gas welding: see oxyfuel gas welding. groove weld: a weld made in the groove between two members. header: see main. heat-affected zone (HAZ): that portion of the base metal thathasnotbeenmeltedbutwhosemechanicalproperties ormicrostructure has been altered bythe heatofwelding, brazing, soldering, forming, or cutting. heat fusion: a joining process in which melted surfaces of plastic pipe and fittings are engaged and held together under moderate pressure until cool. imperfection: an abnormality or indication found during examination or inspection that is not necessarily a cause for rejection. See also defect. inert gas: a gas that does not combine with or affect the base material or filler material. inertgas metal arc welding: see gas metal arc welding, the preferred term. inspection: any operation performed to assure the owner that the materials, components, fabrication, and installa- tion are in accordance with the engineering design. Inspection may include review of certifications, welding procedure and welder qualifications, records of examinations and testing, and any examination that may be required by the engineering design. inspector: the owner, or a person representing the owner (notemployed bythe manufacturer, fabricator, or erector when differentfrom the owner), who performs an inspec- tion. jointdesign: the jointgeometrytogetherwith the required dimensions.
oxygen cutting (OC): a group ofcutting processes used to severorremovemetals bymeans ofthereactionofoxygen with the base metal at elevated temperatures. In the case ofoxidation-resistantmetals, the reaction is facilitated by use of a chemical flux or metal powder. pass: a single progression ofa weldingor surfacingopera- tionalongajoint,welddeposit,orsubstrate.Theresultofa pass is a weld bead, layer, or spray deposit. peel test: a destructive method of examination that mechanically separates a lap joint by peeling. peening: the mechanical working of metals using impact blows. pipe: a pressure-tight cylinder used to convey a fluid or a fluid pressure, ordinarily designated pipe in applicable material specifications. Materials designated tube or tubing in the specifications are treated as pipe when intended for pressure service. pipe alignmentguide: a restraint in the form ofa sleeve or frame that permits the pipeline to move freely only along the axis of the pipe. See restraint. pipe-supporting elements: these include the following: fixtures: elements thattransfertheloadfromthe pipeor structural attachment to the support structure or equip- ment. structural attachments: brackets, clips, lugs, or other elements welded, bolted, or clamped to the pipe. Support structures such as stanchions, towers, building frames, and foundations, and equipment such as vessels, exchangers, and pumps, are not considered pipe-supporting elements. piping: assemblies ofpipe and piping components used to convey, distribute, mix, separate, discharge, meter, and control fluid flows. Piping also includes pipe-supporting elements, butdoes notinclude supportstructures, such as building frames, bents, foundations, or any equipment excluded from this Code. piping components: mechanical elements suitable for joining or assembly of pipe into pressure-tight fluid- containing piping systems. Components include fittings, flanges, gaskets, bolting, valves, and devices such as expansion joints, flexible joints,root penetration: the depth that a weld extends into the rootofa jointmeasured on the centerline ofthe rootcross section. root reinforcement: weld reinforcement at the side other than that from which welding was done. root surface: the exposed surface of a weld on the side other than that from which welding was done. run: see main. seal weld: a fillet weld used on a pipe joint primarily to obtain fluid tightness as opposed to mechanical strength; usually used in conjunction with a threaded joint. semiautomatic arc welding: arc welding with equipment thatcontrols only the filler metal feed. The advance ofthe welding is manually controlled. shall: used to indicate that a provision or prohibition in this Code is required, i.e., mandatory.

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