0207

"Calculations based on fiberglass pipe insulation with k = 0.23, initial water temperature of 42°F, and ambient air temperature of - 10°F. Flow rate represents the gallons per minute required in a 100-ft pipe and may be prorated for longer or shorter

"Calculations based on fiberglass pipe insulation with k = 0.23, initial water temperature of 42°F, and ambient air temperature of - 10°F. Flow rate represents the gallons per minute required in a 100-ft pipe and may be prorated for longer or shorter on yearly average operating conditions rather than on worst-case design conditions. since the intent is to maximize the owner's financial return, an average condition will not overstate the savings as the worst case or worst season might. A good approach to process work is to calculate the economic thickness based on yearly averages and then check the sufficiency of that thickness under the worst-case design conditions. That way, both criteria are met.

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