Ashrae Chilled Water Pipe Sizing Chart Pdf !!LINK!!
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The equation for condensation control in pipes, if the specified insulation thickness is less than the critical pipe diameter, can be calculated by combining the insulation thickness with the thermal conductivity (not thermal conductivity values) and the effective surface area of the insulation. For example, for a typical mineral wool insulation having an insulation thickness of about 1 in. above the critical pipe diameter of 3/4 in. NPS, a thermal conductivity value of 0.23 Btu-in./hr-ft2-°F at 55°F mean, and a critical pipe diameter of 3/4 in. NPS, the equation would be
The equations for both above and below-ambient service are also included in the new Standard 90.1. Figure 2 is a repeat of the Figure 1 diagrams. The minimum insulation thickness is in the left hand column for each type of insulation, and the minimum thermal conductivity of the insulation in the left hand column is equal to the minimum thermal conductivity of the insulation types listed in the right hand column. Figure 3 shows the minimum insulation thicknesses for a variety of insulation materials for pipes with a critical pipe diameter of 1 in. NPS. Figure 4 shows the minimum thermal conductivity values for the insulation listed in the right hand column.
Some engineers who installed the old Standard 90.1, which used less than 0.75 in. of insulation on chilled water pipes, have reported that they found it difficult to install that much insulation into the pipe because of the thickness of the internal pipe liner. This liner is often made of fiberglass, and it can be thick enough to restrict the space to mount a 2 in. or 3 in. thick pipe insulation. The Standard 90.1 requirement that the interior of the pipe liners not exceed 0.5 in. in thickness is listed as an “engineering guide,” and it is not required by the Standard. It is up to engineers and contractors to find a satisfactory path, perhaps adding an additional 0.5 in. of insulation.
Fiberglass does not have this property, and if heated to the temperature that the lining material will reach, the fiberglass will be stretched and will become warped. A fiberglass-lined pipe could be installed as a high-temperature heating pipe, but any additional heating (from the return water or a distributed heating system or even from a mechanical system) would cause the fiberglass to become warped, and the pipe would become nonfunctional for condensation and steam control.
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