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Hello, We are designing a welding facility with with multiple large pits (8'W x 41'L x 8'D). These pits will have a fully retractable grated surface to allow the working surface to be lowered to an ergonomic height, and be completely cover by grating when closed. These pits are concrete walls...

How does one determine the Lowest Mean Temperature for one day? I am trying to determine if heating is need for a fire tank and NFPA 22 does not give a clear direction. The location in question is Bainbridge, GA which is in the southwest corner of the state. Thanks in advance.

Ever just stared at something for the longest time and couldn't see it... Thanks Latexman!

I have a large fire protection tank, 34ft tall x 29ft dia, holds 175000 gallons of water. I have a Lowest One Day Mean Temp of 25F and the min target temp is 42F. Tank is made of carbon steel. Using the NFPA 22 figure 16.1.4, heat loss = square area x (heat difference) / R, I get a heat loss...