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ASME B31.5-2019 pdf download

ASME B31.5-2019 pdf download.Refrigeration Piping and Heat Transfer Components.
Exclusions. This Code shall not apply to any of the following: (a) any self-contained or unit systems subject to the requirements of Underwriters Laboratories or other nationally recognized testing laboratory (b) water piping, other than where water is used as a secondary coolant or refrigerant (c) piping designed for external or internal gage pres- sure not exceeding 15 psi (105 kPa) regardless of size (d) pressure vessels, compressors, or pumps, but does include all connecting refrigerant and secondary coolant pipingstarting atthe firstjointadjacentto such apparatus 500.1.2 Units of Measure. This Code states values in both U.S. Customary (USC) and International System (SI) units. Within the text, the SI units are shown in parenth- eses orinseparate tables. Thevalues stated ineachsystem are not exact equivalents; therefore, each system ofunits should be used independently of the other. When separate equations are provided for USC and SI units, those equations shall be executed using variables in the units associated withthe specificequation. The results obtained from execution of these equations may be converted to other units. When necessary to convert from one system of units to another, conversion should be made by rounding the values to the number of significant digits of implied precision in the starting value, but not less than four significant digits for use in calculations. 500.2 Definitions For convenience in reference, some of the more common terms relating to piping are defined in this para- graph. Most welding definitions were taken from the AWS WeldingHandbook, Volume 1, 7th Edition. Heattreatment terms were taken from ASM Metals Handbook Properties and Selection of Materials, Volume 1, 8th Edition. arcwelding: a group ofweldingprocesses wherein coales- cence is produced by heating with an electric arc(s), with orwithoutthe applicationofpressure and with orwithout the use of filler metal.
joint penetration: the minimum depth a groove or flange weld extends from its face into a joint, exclusive of rein- forcement. limited charge system: a system in which, with the compressor idle, the internal volume and total refrigerant charge are such that the design pressure will not be exceeded by complete evaporation of the refrigerant charge. low side: the parts of a refrigerating system subjected to evaporator pressure. manual welding: welding wherein the entire welding operation is performed and controlled by hand. mechanicaljoint: a joint obtained by joining ofmetal parts through a positive holding mechanical construction. miterjoint: two or more straight sections ofpipe matched and joined on a plane bisecting the angle or junction so as to produce a change in direction. nominal: anumerical identificationofdimension,capacity, rating, orother characteristic used as a designation, notas an exact measurement. peening: the mechanical working of metals by means of impact blows. pipe: a tubular component, usually cylindrical, used for conveying fluid and normally designated “pipe” in the ap- plicable specification. It also includes similar components designated “tube.” Types ofwelded pipe, according to the method of manufacture, are defined as follows: double submerged-arc welded: pipe having a longitudi- nal buttjointproducedbyatleasttwo passes, oneofwhich is on the inside of the pipe. Coalescence is produced by heatingwithan electric arcorarcs betweenthe baremetal electrode or electrodes and the work. The welding is shielded by a blanket of granular, fusible material on the work. Pressure is not used and filler metal for the inside and outside welds is obtained from the electrode or electrodes. electric flash welded: pipe having a longitudinal butt joint wherein coalescence is produced, simultaneously over the entire area of abutting surfaces, by the heat obtained from resistance to the flow of electric current between the two surfaces, undercut: a groove melted into the base metal adjacent to the toe or root of a weld and left unfilled by weld metal. weld: a localized coalescence of metals or nonmetals produced by heating the materials to suitable tempera- tures, with or without the application of pressure, and with or without the use of filler metal. welder: one who is capable of performing a manual or semiautomatic welding operation. weldingoperator: one who operates machine orautomatic welding equipment. welding procedures: the detailed methods and practices including all joint welding procedures involved in the production of a weldment. weldment:an assemblywhose componentparts are joined by welding.

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