Directions      This nomograph is for your convenience in determining the required thickness of Aeroflex Closed Cell Insulation for cold pipes of air-conditioning systems, when cold pipe temperature, room temperature, and relative humidity are already known.

How to determine the required thickness of Aeroflex insulation EXAMPLE : Cold Pipe Surface Temp. 45°F (7.2°C) Room Temperature          85°F (29.4°C) Relative Humidity            80%

1.	Connect 45°F (point A) on Cold Surface Temperature Scale, and 85°F (point A') on Air Temperature Scale with a straightedge, forming straight line between A and A'.
2.	From point A' : follow the horizontal line up to the relative humidity 80% curve. From this intersection (point B), draw a straight vertical line to the relative humidity 100% curve (point B' - saturation curve). Point B' (78.2°F, 25.7°C) shows DEW POINT value of the above mentioned atmosphere (air temp. 85°F, relative humidity 80%).
3.	From point B' : draw a backward straight line, until it intersects the line A - A' (point C). Point C shows the proper thickness of Aeroflex Closed Cell Insulation (Vertical lines 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2" and 2"). To avoid any condensation problem, the 3/4" nominal wall thickness should be used in the situation indicated above.