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ASME B31.12-2019 pdf download

ASME B31.12-2019 pdf download.Hydrogen Piping and Pipelines.
The designer is responsible to the owner for assurance that the engineering design of piping or the pipeline system complies with the requirements of this Code and with any additional requirements established by the owner. GR-1.2.3 Construction Organization The construction organization of piping and pipeline systems is responsible for providing materials, compo- nents, and workmanship in compliance with the require- ments of this Code and the engineering design. GR-1.2.4 Owner’s Inspector The owner’s Inspector is responsible to the owner to verify that all required examinations, inspections, and testing are complete. The owner’s Inspector verifies that all required certifications and records have been completed. Also, the owner’s Inspector is responsible for verification of the construction organization’s quality systems program implementation. GR-1.3 ð19Þ INTENT OF THE CODE (a) It is the intent ofthis Code to set forth engineering requirementsdeemednecessaryforsafedesign,construc- tion, and installation of piping and pipeline systems in hydrogen service. (b) This Code generallyspecifies a simplified approach formanyofitsrequirements.Adesignermaychoosetouse a more rigorous analysis to develop design and construc- tion requirements. When the designer decides to take thisweldingmaterials,seeASMEBPVC,SectionII,PartC alloy steel: steel to which one or more alloying elements other than carbon have been deliberately added (e.g., chromium, nickel, molybdenum) to achieve a particular physical property. ambient temperature: temperature of the surrounding medium, usually used to refer to the temperature of theairinwhichastructureissituatedoradeviceoperates. annealheattreatment: heatingto and holdingata suitable temperature and then cooling at a suitable rate for such purposes as reducing hardness, improving machinability, facilitating cold working, producinga desired microstruc- ture, or obtaining desired mechanical, physical, or other properties. anode: electrode ofan electrochemical cell atwhich oxida- tion occurs.
Electrons flow away from the anode in the external circuit. Corrosion usually occurs, and metal ions enter the solution at the anode. arc cutting: group of cutting processes wherein the severing or removing of metals is affected by melting with the heat of an arc between an electrode and the base metal (includes carbon-arc cutting, metal-arc cutting, gas metal-arc cutting, gas tungsten-arc cutting, plasma-arc cutting, and air carbon-arc cutting). (See also oxygen-arc cutting.) arc welding: group of welding processes wherein coales- cence is produced by heating with an electric arc or arcs, with or without the application of pressure and with or without the use of filler metal. assembly: joining together oftwo or more piping compo- nents by bolting, welding, screwing, brazing, or use of packing devices as specified by the engineering design. autogenous welding: fusion welding method using heat to jointwopiecesofmetalwithouttheadditionoffillermetal. automaticwelding:weldingwithequipmentthatperforms the welding operation withoutadjustmentofthe controls by an operator. backfill: material placed in a hole to fill the space around the anodes, vent pipe, and buried components of a cathodic protection system. backing ring: material in the formcold spring factor: ratio of the amount of cold spring provided to the total computed temperature expansion. cold springing: fabrication of piping to an actual length shorterthan its nominal length and forcingitinto position sothatitis stressedintheerectedcondition,thus compen- sating partially for the effects produced by the expansion due to an increase in temperature. completeweldjointpenetration (CWJP):includes thedepth of bevel and root penetration, plus the required I.D. and O.D. reinforcement. concave (suckback): internal condition of the root bead, having an abrupt concave condition with sharp edges. concavity: internal root bead that is properly fused to and completely penetrates the pipe wall but whose center is below the inside surface of the pipe wall. construction organization: fabricator, contractor, assem- bler, or installer responsible for all functions involved in the design, fabrication, and erection of the hydrogen piping system. consumable insert: preplaced filler metal thatis complete- ly fused into the root ofthe joint and becomes part ofthe weld. controlpiping: all piping, valves, and fittings used to inter- connect air, gas, or hydraulically operated control appa- ratus or instrument transmitters and receivers. corrosion: deterioration ofa material, usuallya metal, that results from a reaction with its environment. crack: very narrow elongated defect caused by metallur- gical or mechanical conditions. crevice corrosion: localized corrosion ofa metal surface at, or immediately adjacent to, an area that is shielded from full exposure to the environment because of close proxi- mity of the metal to the surface of another material. cryogenic conditions: low temperature conditions, usually at or below 123 K (−239°F). current: flow of electric charge.

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