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ASME B31.3-2016
<br /> (b) random examination sufficiently provide the leak tightness required to protect
<br /> (c) spot examination personnel from exposure
<br /> (d) random spot examination (c) Elevated Temperature Fluid Service: a fluid service
<br /> extruded outlet header: see para. 304.3.4. in which the piping metal temperature is sustained
<br /> equal to or greater than Tc,as defined in Table 302.3.5,
<br /> fabrication: the preparation of piping for assembly, General Note (b).
<br /> including cutting, threading, grooving, forming, bend- (d) High Pressure Fluid Service: a fluid service for
<br /> ing,and joining of components into subassemblies.Fab- which the owner specifies the use of Chapter IX for
<br /> rication may be performed in the shop or in the field. piping design and construction; see also para. K300.
<br /> face of weld: the exposed surface of a weld on the side (e) High Purity Fluid Service: a fluid service that
<br /> from which the welding was done. requires alternative methods of fabrication,inspection,
<br /> examination, and testing not covered elsewhere in the
<br /> face seal fitting: a High Purity Fluid Service fitting that Code, with the intent to produce a controlled level of
<br /> incorporates two machined faces and a metallic gasket cleanness. The term thus applies to piping systems
<br /> within an external/internal nut configuration to attain defined for other purposes as high purity, ultra high
<br /> a high leak integrity seal. See also para. U315.3(b).
<br /> purity, hygienic, or aseptic.
<br /> filler material:the material to be added in making metallic (f) Normal Fluid Service: a fluid service pertaining to
<br /> or nonmetallic joints. most piping covered by this Code, i.e., not subject to
<br /> fillet weld:a weld of approximately triangular cross sec- the rules for Category D, Category M, Elevated
<br /> tion joining two surfaces approximately at right angles Temperature, High Pressure, or High Purity Fluid
<br /> to each other in a lap joint,tee joint,or corner joint. (See Service.
<br /> also size of weld and throat of a fillet weld.) full fillet weld: a fillet weld whose size is equal to the
<br /> flammable:for the purposes of this Code,describes a fluid thickness of the thinner member joined.
<br /> that under ambient or expected operating conditions is fusion: the melting together of filler material and base
<br /> a vapor or produces vapors that can be ignited and material, or of base material only, that results in
<br /> continue to burn in air. The term thus may apply, coalescence.
<br /> depending on service conditions, to fluids defined for gas metal-arc welding (GMAW): an arc-welding process
<br /> other purposes as flammable or combustible. that produces coalescence of metals by heating them
<br /> fluid service: a general term concerning the application with an arc between a continuous filler metal (consum-
<br /> of a piping system,considering the combination of fluid able) electrode and the work. Shielding is obtained
<br /> properties, operating conditions,and other factors that entirely from an externally supplied gas,or gas mixture.
<br /> establish the basis for design of the piping system. See Some variations of this process are called MIG or COz
<br /> Appendix M. welding (nonpreferred terms).
<br /> (a) Category D Fluid Service: a fluid service in which gas tungsten-arc welding(GTAW):an arc-welding process
<br /> all of the following apply: that produces coalescence of metals by heating them
<br /> (1) the fluid handled is nonflammable, nontoxic, with an arc between a single tungsten(nonconsumable)
<br /> and not damaging to human tissues as defined in electrode and the work. Shielding is obtained from a
<br /> para. 300.2 gas or gas mixture. Pressure may or may not be used
<br /> (2) the design gage pressure does not exceed and filler metal may or may not be used. (This process
<br /> 1035 kPa (150 psi) has sometimes been called TIG welding.)
<br /> (3) the design temperature is not greater than 186°C gas welding: a group of welding processes wherein
<br /> (366°F) coalescence is produced by heating with a gas flame or
<br /> (4) the fluid temperature caused by anything other flames,with or without the application of pressure,and
<br /> than atmospheric conditions is not less than —29°C with or without the use of filler material.
<br /> (-20°F)
<br /> (b) Category M Fluid Service: a fluid service in which groove weld: a weld made in the groove between two
<br /> both of the following apply: members to be joined.
<br /> (1) the fluid is so highly toxic that a single exposure heat affected zone:that portion of the base material which
<br /> to a very small quantity of the fluid,caused by leakage, has not been melted,but whose mechanical properties or
<br /> can produce serious irreversible harm to persons on microstructure have been altered by the heat of welding,
<br /> breathing or bodily contact, even when prompt restor- brazing, soldering,forming, or cutting.
<br /> ative measures are taken heat treatment:the following terms describe various types
<br /> (2) after consideration of piping design,experience, and processes of heat treatment:
<br /> service conditions, and location, the owner determines (a) annealing: heating to and holding at a suitable
<br /> that the requirements for Normal Fluid Service do not temperature above the transformation temperature
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