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Process duct work may be round or rectangular. Although round duct work costs more to fabricate than rectangular duct work, it requires fewer stiffeners and is favored in many applications over rectangular ductwork. The air in process duct work may be at ambient conditions or may operate at up to 900 °F (482 °C).
pound per square foot: psf ≡ 1 lbf/ft 2: ≈ 47.880 26 Pa [33] pound per square inch: psi ≡ 1 lbf/in 2: ≈ 6.894 757 × 10 3 Pa [33] poundal per square foot: pdl/sq ft ≡ 1 pdl/sq ft ≈ 1.488 164 Pa [33] short ton per square foot: ≡ 1 short ton × g 0 / 1 sq ft ≈ 9.576 0518 × 10 4 Pa: torr: torr ≡ 101 325 ⁄ 760 Pa ≈ 133.3224 ...
For the limiting case of a very wide duct, i.e. a slot of width b, where b ≫ a, and a is the water depth, then D H = 4a. For a fully filled duct or pipe whose cross-section is a convex regular polygon , the hydraulic diameter is equivalent to the diameter D {\displaystyle D} of a circle inscribed within the wetted perimeter .
As a unit of area, the circular mil can be converted to other units such as square inches or square millimetres. 1 circular mil is approximately equal to: 0.7854 square mils (1 square mil is about 1.273 circular mils) 7.854 × 10 −7 square inches (1 square inch is about 1.273 million circular mils) 5.067 × 10 −10 square metres
Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used. Stock pipe is usually sold in 10' (300 cm) joints.
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