Category Archives for Refrigerant Piping

Pipe Insulation

The cost of the insulation of low-temperature pipe is usually of the same order of magnitude as that of the pipe itself. Also, since the diameter of the insulated pipe may be twice or three times that of the pipe … Continue reading

15. May 2018 by Jim
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Choice Of Materials For Refrigerant Piping

Copper is the material almost universally used for halocarbon piping, with no low-temperature limitations in industrial refrigeration practice. For ammonia systems, since copper is not acceptable, all pipe is steel in one form or another. While aluminum is often used … Continue reading

15. May 2018 by Jim
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Pipe Safety

Probably more accidents connected with refrigeration systems are associated with the piping system than with any other subsystem. To avoid the chance of damage, particularly damage that would result in a release, care should be exercised in several categories: (1) … Continue reading

15. May 2018 by Jim
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Lifting Liquid From The Evaporator In The Vertical Riser

A special situation is encountered frequently in the return line from a liquid overfeed evaporator, as shown in Figs. 9.12a and 9.12b. An example of the situation is a spiral freezer chamber where the liquid and vapor leaving the evaporators … Continue reading

15. May 2018 by Jim
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Sizing The Liquid/Vapor Return Line

Mixtures of liquid and vapor flow through the tubes of condensers and evaporators and in the return line from the evaporator to the low-pressure receiver in liquid recirculation systems. Sizing the pipe and specifying the pressure drop in evaporators and … Continue reading

15. May 2018 by Jim
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Suction Risers In Direct Expansion Halocarbon Systems

This section concentrates on the selection of the pipe size of suction risers in halocarbon systems that are designed for direct expansion (not liquid recirculation). When the physical arrangement requires vertical risers at the evaporator outlet, the dominant factor influencing … Continue reading

15. May 2018 by Jim
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Avoiding Drainage To Compressors And To Evaporators

If the physical arrangement will permit it, certain vapor lines should be sloped in order to prevent liquid from draining back to the evaporator outlets and to the suction of the compressors. Figure 9.6 shows several vapor lines and the … Continue reading

15. May 2018 by Jim
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Downward Sloping Pipe

When a liquid line slopes downward in the direction of flow, the gain in pressure due to the drop in elevation works counter to the drop in pressure due to friction. A borderline condition exists when the increase in pressure … Continue reading

15. May 2018 by Jim
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Rise Of Elevation Of Liquid Flowing In A Pipe

Equations 9.1 and 9.2 as well as charts such as the one in Fig. 9.2 predict pressure drops due to friction in horizontal pipes. When a pipe carrying liquid slopes upward in the direction of flow, an additional pressure drop … Continue reading

15. May 2018 by Jim
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Selecting The Pipe Size

The ability to determine the pressure drop in a refrigerant line may be crucial, but there remains the decision of how much pressure drop (or drop in saturation temperature) to specify. While the optimization process discussed in Sec. 9.5 would … Continue reading

15. May 2018 by Jim
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