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ASME B31.12-2014 pdf download

ASME B31.12-2014 pdf download.Hydrogen Piping and Pipelines.
GR-1.3 INTENT OF THE CODE (a) It is the intent of this Code to set forth engineering requirements deemed necessary for safe design, con- struction, and installation of piping and pipeline sys- tems in hydrogen service. (b) Engineering requirements of this Code, while con- sidered necessary and adequate for safe design, gener- ally employ a simplified approach to the subject. A designer capable of applying a more rigorous analysis shall have the latitude to do so; however, the approach must be documented in the engineering design and its validity accepted by the owner. The approach used shall provide details of design, construction, examination, inspection, and testing. (c) Piping elements should, insofar as practicable, conform to the specifications and standards listed in this Code. Piping elements neither specifically approved nor specifically prohibited by this Code may be used, provided theyare qualified foruse as setforthin applica- ble parts of this Code. (d) The engineering design shall specify any unusual requirements for a particular service. Where service requirements necessitate measures beyond those required by this Code, such measures shall be specified by the engineering design. Where so specified, the Code requires that they be accomplished. (e) Code requirements include specific provisions applicable to hydrogen service. These requirements shall include, butshall notbe limited to, selection and applica- tion of materials, components, and joints. Service requirements include prohibitions, limitations, and con- ditions, such as temperature and pressure limits or a requirement for safeguarding. Code requirements for a piping or pipeline system are established by the most restrictive requirements that apply to any element of the system. GR-1.4 PACKAGED EQUIPMENT REQUIREMENTS Also included within the scope of this Code is piping that interconnects pieces or stages within a packaged equipment assembly for piping or pipeline systems. This Code excludes the following: (a) the exclusions specifically limited by Part IP, Industrial Piping or Part PL, Pipelines (b) piping that is required to conform to another Code (c) tubes, tube headers, crossovers, and manifolds of fired heaters that are internal to the heater enclosure (d) power boilers, pressure vessels, heat exchangers, pumps, compressors, and other fluid handling or pro- cessing equipment, including internal piping and con- nections for external piping GR-1.5 TERMS AND DEFINITIONS Some of the terms relating to piping components, and the fabrication and erection of piping and pipeline 2 systems are found in this paragraph. For additional terms relating to (a) welding and brazing, see ASME Boiler & Pressure Vessel Code Section IX or AWS Standard A3.0 (b) nondestructive examination, see ASME BPV Code Section V (c) materials, see ASME BPV Code Section II, Parts A, B, and D (d) welding materials, see ASME BPV Code Section II, Part C 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 the air in which a structure is situated or a device operates. anneal heat treatment: heating to and holding at a suitable temperature and then cooling at a suitable rate for such purposes as reducing hardness, improving machinabil- ity, facilitating cold working, producing a desired micro- structure, or obtaining desired mechanical, physical, or other properties. anode: electrode of an electrochemical cell at which oxi- dation 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 sev- ering 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 of two 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 join two pieces of metal without the addition of filler metal. automatic welding: welding with equipment that per- forms the welding operation without adjustment of the 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 form of a ring used to sup- port molten weld metal. base material: material of the piping component, plate, or other metallic products.

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