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(this is based on personal experience, and my vary with loads, duct size, and industry standards) Large, round process ductwork is usually fabricated from 1/4-inch (6 mm) mild steel plate, with ovaling stiffening rings at 15 to 20 ft (5 to 6 M) on center, regardless of diameter. These lengths allow for resistance to wind ovaling and resistance ...
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 .
Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...
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.
During the manufacturing process the mother tube goes through a series of shaping stands which form the round HSS (mother tube) into the final square or rectangular shape. Most American manufacturers adhere to the ASTM A500 or newly adopted ASTM A1085 standards, while Canadian manufacturers follow both ASTM A500 and CSA G40.21.
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British Standard Pipe Parallel Thread Dimensions; British Standard Pipe Taper Thread Dimensions Archived 2017-09-27 at the Wayback Machine; BSP Thread Charts and Diagrams, showing dimensions of tubing and fittings; ISO 7-1:1994; ISO 7-2:2000; ISO 228-1:2000; ISO 228-2:1987; Parallel pipe threads G; Parallel pipe threads PF