ASHRAE 158.2 : 2011

Foreword
1 Purpose
2 Scope
3 Definitions and Symbols
4 Instrumentation
5 General Piping Specifications
6 Data to be Reported
7 Test Conditions
8 Test Procedure
9 Incompressible Flow Regime Capacity Calculations
10 Compressible Flow Regime Capacity Calculations
11 Choked Flow Regime Capacity Calculations
12 References
Informative Annex A: Example Tables, Graphs, and Data
                     Sheets
Informative Annex B: Example of Computation to Express
                     Regulator Capacity in Terms of
                     Refrigerating Effect

Describes methods of determining the mass flow capacity of refrigerant pressure regulators with sufficient accuracy to facilitate proper engineering application of the device in systems operating at various conditions with various refrigerants.

22.1 This standard applies to refrigerant pressure regulators hat meet the definition found in Section 3 and that are intended for refrigerant service in applications where only single-phase flow occurs within the regulator.2.2 This standard is applicable to refrigerant pressure regulatorsin the following circumstances: a. for use in either liquid or vapor refrigerant applications and b. for use with refrigerants deemed suitable according to ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems1 and ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants.2 2.3 This standard specifies procedures, apparatus, and instrumentation that will produce capacity and gradient information with sufficient accuracy to support the proper application of the tested regulator. 2.4 This standard does not do the following: a. specify rating conditions or electrical or mechanical design requirements (rating conditions may be found in AHRI Standard 770, Refrigerant Pressure Regulating Valves3), b. make recommendations for safety, or c. specify tests for production, specification compliance, or field testing of regulators.