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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.
The main advantage of plumbing pipes is widespread availability, slightly larger diameter, and thicker walls. The thicker material increases durability and ruggedness in installations where pipe runs are exposed to mechanical damage or abuse (although this has rarely been reported as a problem with thin-wall piping).
In 1973, in response to the 1973 oil crisis and conservation concerns, ASHRAE Standards 62-73 and 62–81) reduced required ventilation from 10 CFM (4.76 L/s) per person to 5 CFM (2.37 L/s) per person. In cold, warm, humid, or dusty climates, it is preferable to minimize ventilation with outdoor air to conserve energy, cost, or filtration.
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From the chart, it is evident that the friction factor is never zero, even for smooth pipes because of some roughness at the microscopic level. The friction factor for laminar flow of Newtonian fluids in round tubes is often taken to be: [4] = [5] [2] where Re is the Reynolds number of the flow.
The chart shows a 75-year history of annual United States natural gas production and average wellhead prices from 1930 through 2005. Prices paid by consumers were increased above those levels by processing and distribution costs.
A whole floor of a building in New York City was once functioning as an "illegal police station" for the government of the People’s Republic of China, according to the U.S. Department of Justice ...
Wendy's Frosty key tag deal. Wendy's is also still offering its $3 Frosty Key Tag until Feb. 16. Customers can spend $3 for the keychain and get a free Jr. Frosty with any purchase, per the ...