ASME B31.5:2019 pdf download.Refrigeration Piping and HeatTransfer Components.
Rules for this Code Section have been developed considering the needs for applications that include piping and heat transfer components for refrigerants and secondary coolants.
This Code prescribes requirements for the materials, design, fabrication, assembly, erection, test, and inspection of refrigerant, heat transfer components, and secondary coolant piping for temperatures as low as —320°F (—196°C), whether erected on the premises or factory assembled, except as specifically excluded in the following paragraphs.
500.1.1 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 pressure not exceeding 15 psi (105 kPa) regardless of size
(d) pressure vessels, compressors, or pumps, but does include all connecting refrigerant and secondary coolant piping starting at the first joint adjacent to 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 parentheses or in separate tables. The values stated in each system are not exact equivalents; therefore, each system of units 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 with the specific equation. 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 paragraph.
Most welding definitions were taken from the AWS Welding Handbook, Volume 1,7th Edition. Heat treatment terms were taken from ASM Metals Handbook Properties and Selection of Materials, Volume 1, 8th Edition.
arc welding: a group of welding processes wherein coalescence is produced by heating with an electric arc(s), with or without the application of pressure and with or without the use of filler metal.ASME B31.5 pdf download.