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Comment PDF Heat Transfer

ASTM Standards For Heat Transfer Fluids

By Gerald Guffey |

This practical overview of ASTM standards can serve as a roadmap when selecting and evaluating heat transfer fluids Heat-transfer-fluid systems are often used for process heating to 500°F or higher. To accomplish heating above 500°F, steam pressure must be above 600 psig. For many plants, distributing steam above 600 psig is impractical due to high cost and more stringent water-purity requirements. High-temperature heat-transfer fluids have a much lower vapor pressure than water at high temperature, so the design pressure of a heat-transfer-fluid system can be lower. Most systems operate with the heat transfer fluid in the liquid phase. A few heat transfer fluids have a narrow boiling range and can be used in a vapor-phase system, but the design of the system is much different and the process heating temperature must match the boiling range of the fluid. High-temperature heat-transfer fluids are generally classified as inorganic eutectic salts, synthetic organics (Figure 1), aromatic oils, paraffinic oils and silicone-based fluids. The chemistry of each heat-transfer fluid is different, so each fluid has different properties. Considerable background and technical information about heat transfer fluids is provided in chapter 21…
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