NFPA 30

3. Maintain a maximum conductance value of 4.0 Btu per hr per ft2 per degree Fahrenheit (Btu/hr/ft2/튔) when the outer insulation jacket or cover is at a temperature of 1660튔 (904.4튏) and when the mean temperature of the insulation is 1000튔 (537.8튏). ................
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