The piping for all space- conditioning and service water-heating systems with fluid temperatures listed in Table A5.207.6-A shall have the amount of insulation specified in Subsection A220.127.116.11 or A18.104.22.168. Insulation conductivity shall be determined in accordance with ASTM C335 at the mean temperature listed in Table A5.207.6-A and shall be rounded to the nearest 1/100 Btu-inch per hour per square foot per °F.
Insulation shall be protected from damage, including that due to sunlight, moisture, equipment maintenance and wind, including but not limited to, the following:
Insulation exposed to weather shall be suitable for outdoor service, e.g., protected by aluminum, sheet metal, painted canvas or plastic cover. Cellular foam insulation shall be protected as above or painted with a coating that is water retardant and provides shielding from solar radiation that can cause degradation of the material.
Insulation covering chilled water piping and refrigerant suction piping located outside the conditioned space shall include a vapor retardant located outside the insulation (unless the insulation is inherently vapor retardant), all penetrations and joints of which shall be sealed.
- Factory-installed piping within space-conditioning equipment certified under Section A5.210.1 or A5.207.1.
- Piping that conveys fluids with a design operating temperature range between 60°F and 105°F.
- Piping that serves process loads, gas piping, cold domestic water piping, condensate drains, roof drains, vents or waste piping.
- Where the heat gain or heat loss to or from piping without insulation will not increase building source energy use.
- Piping that penetrates framing members shall not be required to have pipe insulation for the distance of the framing penetration. Metal piping that penetrates metal framing shall use grommets, plugs, wrapping or other insulating material to assure that no contact is made with the metal framing.
PIPE INSULATION THICKNESS
|CONDUCTIVITY RANGE |
(in Btu-inch per hour persquare foot per °F)
|INSULATION MEAN |
|NOMINAL PIPE DIAMETER (in inches)|
up to 2
|1.25-2||2.50-4||5-6||8 and |
|INSULATION THICKNESS REQUIRED (in inches)|
|Space heating systems (steam, steam condensate and hot water)|
|Service water-heating systems (recirculating sections, all piping in electric trace tape systems and the first 8 feet of piping from the storage tank for nonrecirculating systems)|
|Space cooling systems (chilled water, refrigerant and brine)|
For insulation with a conductivity outside the range shown in Table A5.207.6-A for the applicable fluid temperature range, the insulation shall have a minimum thickness as calculated with Equation A5.207.6-A below.
INSULATION THICKNESS EQUATION
|T||=||Minimum insulation thickness for material with conductivity K, inches.|
|PR||=||Pipe actual outside radius, inches.|
|t||=||Insulation thickness from Table A5.207.6-A, inches.|
|K||=||Conductivity of alternate material at the mean rating temperature indicated in Table A5.207.6-A, for the applicable fluid temperature range, in Btu-inch per hour per square foot per °F.|
|k||=||The lower value of the conductivity range listed in Table A5.207.6-A, for the applicable fluid temperature range, Btu-inch per hour per square foot per °F.|