ASME B31.5:2019 pdf free download – Refrigeration Piping and Heat Transfer Components
This Refrigeration Piping and Heat Transfer Compo- nents Code is aSectionofthe AmericanSocietyofMechan- ical Engineers (ASME) Code for Pressure Piping, B31. This Section is published as a separate documentfor simplicity and for convenience ofCode users. The users ofthis Code are advised that in some areas legislation may establish governmental jurisdiction over the subject matter covered by the Code. The owner of a piping installation shall choose which piping codes are applicable to the installation and shall have the overall responsibility for compliance with this Code. (See Nonmandatory Appendix B.) The owner ofa complete piping installation shall have the overall responsibility for compliance with this Code.
It is required that the engineering design specify any special requirements pertinent to the particular service involved. For example, the engineering design shall not foranyservicespecifyaweldqualitylowerthanthatstipu- lated in para. 527.3.2(d) for the Code-required visual examination quality and for the types of welds involved; butwhereservice requirements necessitate addedquality and more extensive nondestructive examination, these are to be specified in the engineering design and anyrevi- sionthereto, andwhenso specified, theCode requires that they be accomplished.
The Code generally employs a simplified approach for many ofits requirements. A designer may choose to use a more complete and rigorous analysis to develop design and construction requirements. When the designer decides to take this approach, the designer shall provide details and calculations demonstrating that design, contruction, examination, and testing are consis- tentwiththecriteriaofthisCode.Thedetailsshallbedocu- mented in the engineering design.
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 orinseparatetables.Thevaluesstatedineachsystem 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 associatedwith the 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.
gas metal-arc welding (GMAW): an arc welding process wherein coalescence is produced by heating with an arc between a continuous filler metal (consumable) elec- trode and the work. Shieldingis obtained entirelyfrom an externally supplied gas or gas mixture. (Some methods of this process are called MIG or CO 2 welding.) gas tungsten-arc welding (GTAW): an arc welding process wherein coalescence is produced by heating with an arc between a single tungsten (nonconsumable) electrode and the work. Shielding is obtained from a gas or gas mixture. Pressure may or may not be used and filler metal mayormaynotbe used. (This process is sometimes called TIG welding.) gaswelding: a group ofweldingprocesses wherein coales- cence is produced by heating with a gas flame or flames, with or without the application of pressure, and with or without the use of filler metal. groove weld: a weld made in the groove between two members to be joined. header: a pipe or tube (extruded, cast, or fabricated) to which a number of other pipes or tubes are connected. heat-affected zone: that portion ofthe base metal that has not been melted, but whose mechanical properties or microstructures have been altered by the heat of welding, brazing, or cutting.