COMcheck 101 Training: HVAC General Requirements
Page 3 of 10
HVAC Piping Insulation
The requirements in the table apply to HVAC piping located in unconditioned space and conveying fluids > 105°F and < 55°F. Typically, this will apply to refrigerant piping and water piping for hydronic heating systems.
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TABLE 803.3.7
MINIMUM PIPE INSULATIONa
(thickness in inches) |
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Fluid |
NOMINAL PIPE DIAMETER |
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≤1.5" |
>1.5" |
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Steam |
1.5 |
3.0 |
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Hot water |
1.0 |
2.0 |
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Chilled water, brine or refrigerant |
1.0 |
1.5 |
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For SI: 1 inch = 25.4 mm, Btu per inch/h - ft2 - ºF = W per 25 mm/K - m2 |
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a. Based on insulation having a conductivity not exceeding 0.27 Btu per inch/h - ft2 - ºF |
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Exceptions
- Piping that conveys fluids that have not been heated or cooled through the use of fossil fuels or electric power
- Runout piping not exceeding 4 ft in length and 1 in. in diameter between the control valve and HVAC coil
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