Ashrae Chilled Water Pipe Sizing Chart Pdf High Quality

For above-ambient service, the pipe insulation thicknesses in Figure 1 are significantly greater than those normally installed (as they have been in previous versions of Standard 90.1, but to a greater degree in the 2010 version). For many of the steam heating distribution pipes in buildings, with an operating temperature greater than 350°F, 5 in. of insulation (such as mineral wool, fiberglass, or calcium silicate) will be required on all pipes except those with a size less than 1 in. NPS. This will probably require double layering and hence greater labor to install. Mechanical designers will need to allow a pipe clearance greater than 10 in., which is often neglected. Even hot water pipes used for hydronic heating will require 2 in. of insulation on all pipe sizes equal to or greater than 1-1/2 in. NPS.

For below-ambient service, by contrast, the new pipe insulation thicknesses are not particularly noteworthy. For example, 1 in. is sufficient thickness for all sizes on chilled water lines (with an assumed operating temperature in the 40°F to 60°F range). This is because these thicknesses were determined for energy conservation, not for condensation control, which often requires thicknesses greater than 1 in., particularly on pipes running through unconditioned spaces. d2c66b5586

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