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A positive pressure enclosure, also known as a welding habitat or hot work habitat, is a chamber used to provide a safe working environment for performing hot work in the presence of explosive gases or vapors. They are commonly used in welding environments and are associated with the offshore oil industry. [1]
In the following decade Ventprom developed a new range of axial flow fans for metro, PTO-16M, PTO-18 PTO-24 VOMD-2.4, which are currently used in subway ventilation systems in Russia and abroad. At the end of 80-s, prior to the collapse of USSR, Ventpom's annual fan production peaked at 1,200 pieces, boasting of export to over 30 countries.
The axial fan is often contained within a short section of cylindrical ductwork, to which inlet and outlet ducting can be connected. Axial fan types have fan wheels with diameters that usually range from less than a foot (0.3 meters) to over 30 feet (9.1 m), although axial cooling tower fan wheels may exceed 82 feet (25 m) in diameter.
This will help a welder to understand how the product will go together so he get an idea of where the weld is needed. The assembly drawing will contain the following; information overall dimensions, weight and mass, identification of all the components, quantities of material, supply details, list of reference drawings, and notes.
Seams in metal exhaust ductwork must be welded, excluding the outer end where a fan or blower is positioned. [ 89 ] : 67 Depending on design choices and HVAC capabilities, the blower may be installed within or above the hood, or it may be positioned at the exhaust point, usually the roof of the building.
The air temperature may vary from ambient to 1000 °F (515 °C). Process ductwork is subject to large loads due to dust buildup, fan suction pressure, wind, and earthquake forces. As of 2009 30 ft diameter process ductwork may cost $7,000 per ton. Failure to properly integrate design forces may lead to catastrophic duct collapse.
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