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eLibrary > ASHRAE Guideline 38-2023, Guideline for Using Metal Pressure Vessels to Test Materials Used in Refrigeration Systems? >

ASHRAE Guideline 38-2023, Guideline for Using Metal Pressure Vessels to Test Materials Used in Refrigeration Systems?, 2023

ASHRAE Guideline 38-2023 [Go to Page]
Contents
Foreword
1. Purpose
2. Scope
3. Definitions
4. Safety [Go to Page]
4.1 Introduction. There are inherent hazards when handling metal vessels and the materials being tested. At times, the absolute pressure inside the metal vessel could exceed the rating pressure of the metal vessel due to internal reaction or hydrosta...
4.2 Safety Shield. The operator shall stand behind a large safety shield made of safety glass or plastic whenever examining a vessel that may be under pressure. This safety shield shall protect the operator’s head, face, and body.
4.3 Personal Protective Equipment. PPE shall include a face shield, heavy cloth lab coat, and heavy gloves (OSHA 3151) 2. A neck protector is optionally added to the mandatory PPE. The face shield shall extend down to protect the neck and upper chest...
4.4 Handling Flammable Solvents. Solvents and refrigerants used in this method for various reasons could be flammable. Provide adequate ventilation; wear proper gloves (e.g., neoprene, nitrile); and avoid sparks, flame, or heat. Know the location of ...
4.5 Charging Manifold. Safeguards must be taken to avoid excessive pressure on the metal vessel that could cause a rupture while using the charging manifold. Even with these safeguards in the design and the use of the equipment, the operator shall we...
4.6 Refrigerant Handling. Several safety considerations are required for handling refrigerants under pressure. The operator shall be thoroughly familiar with the information about the environmental impact of refrigerants and with the RSES Service App...
4.7 Compatibility of Materials. All materials of construction used in the test apparatus that come in contact with the test materials must exhibit sufficient compatibility to prevent rupture or general failure of the equipment.
5. Apparatus [Go to Page]
5.1 Metal Vessel. The metal vessel should be leak proof and appropriately rated for the expected temperatures and pressures. To avoid dangerous hydrostatic conditions, internal volume and content need to be considered. The vessel should have appropri...
5.2 Vessel Integrity. Ensure the metal vessel, fittings, supply lines, liners, and all glassware are cleaned with an appropriate solvent and then dried to remove moisture and residual solvent. Procedures for drying may include heating in an oven, pur...
5.3 Charging and Heating of Pressure Vessel. Lubricant and materials are added to the vessel prior to adding refrigerant. Refrigerant charging of the vessel can be performed by either vapor or liquid transfer through appropriate transfer devices. Con...
6. Analysis of contents after heating [Go to Page]
6.1 Refrigerant Analysis. During testing, reaction products may be formed in the gas phase of the vessel. These may include other refrigerants, halide acids and other acids, CO2, CO, amine vapors, or other nitrogen components. These reaction products...
6.2 Lubricant Analysis. During the heat aging of the vessel contents, reaction products may be formed in the liquid phase. These may include thermal decomposition and oxidation products of the lubricant, such as organic acids, olefins, polymers, and ...
6.3 Material Analysis. Materials (metal coupons, elastomers, gaskets, polymers, motor materials, desiccants, and other materials or components used in the refrigerant and/or lubricant system) used in the test can be examined and analyzed to determine...
7. significance of results
8. References [Go to Page]

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