NFPA 13 states the following:
126.96.36.199.5 Water-filled piping shall be permitted to be installed in areas where the temperature is less than 40 deg F when heat loss calculations performed by a professional engineer verify that the system will not freeze.
For some reason I had always thought that Tyco or some other heat trace provider had a program available to perform these calculations. I feel there is a better way than breaking out my old heat transfer book. Our general consensus is that the risk is relatively high with these types of calculations.
I’m sure you been tasked with this before; what is the best approach to going about these calculations?
Some owners require these calculations to be performed to avoid dry-pipe systems in Florida, even though the location of the iso-thermal line would require dry-pipe systems - I feel this essentially puts all the liability on the engineer.
I'd be curious to see how others would normally approach this. In this case we would look to run calculations to justify that a wet-pipe system would be sufficient without any insulation or heat trace. Thanks in advance.
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