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ASME 1331.3-2016 Fig. 300.1.1 Diagram Illustrating Application of 1331.3 Piping at Equipment Power boilers in accordance with BPV Code Section I Boiler external piping which is required to conform to B31.1 Packaged equipment piping Tubes,tube headers, Pressure vessels,heat crossovers and manifolds exchangers,pumps,com- of fired heaters,internal pressors and other fluid to the heater enclosure handling or processing equipment,including in- ternal piping and con- nections for external piping Legend Piping within the scope of B31.3 Piping outside the scope GENERAL NOTE: The means by which piping is attached to equipment is within the scope of the applicable piping code. dropped are exactly a 5 or a 5 followed only by zeros, base metal. (Includes carbon-arc cutting, metal-arc cut- choose that ending in an even digit. ting, gas metal-arc cutting, gas tungsten-arc cutting, For example,if the requirement were 6 mm maximum, plasma-arc cutting,and air carbon-arc cutting.)See also a measured value of 6.2 mm would be acceptable oxygen-arc cutting. because the measured value would first be rounded to arc welding(AM a group of welding processes that pro- 6 mm before comparing it to the requirement. If the duces coalescence of metals by heating them with an requirement were 6.0 mm maximum, then a measured arc or arcs,with or without the application of pressure value of 6.2 mm would not meet the requirement. and with or without the use of filler metal. (16) 300.2 Definitions assembly: the joining together of two or more piping Some of the terms relating to piping are defined below. components by bolting, welding, bonding, screwing, For welding, brazing, and soldering terms not shown brazing,soldering,cementing,or use of packing devices here,definitions in accordance with AWS Standard A3.03 as specified by the engineering design. apply. autogenous weld:a weld made by fusion of the base metal air-hardened steel: a steel that hardens during cooling in without the addition of filler metal[see also gas tungsten- air from a temperature above its transformation range. arc welding (GTAW)]. anneal heat treatment: see heat treatment. automatic welding: welding with equipment that per- arc cutting: a group of cutting processes wherein the forms the welding operation without adjustment of the severing or removing of metals is effected by melting controls by an operator.The equipment may or may not with the heat of an arc between an electrode and the perform the loading and unloading of the work. backing filler metal: see consumable insert. AWS A3.0,Standard Welding Terms and Definitions,Including Terms for Adhesive Bonding, Brazing, Soldering, Thermal backing ring:material in the form of a ring used to sup- Coupling and Thermal Spraying port molten weld metal.