[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - a ventilation pipe project], metal duct reinforcement shall meet the following requirements; a) round duct (not including spiral duct) 800mm diameter greater than or equal , and the pipe length is greater than 1250mm or the total surface area greater than 4m2 reinforcement measures should be taken; 2) rectangular duct length was longer than 630mm, duct insulation edge longer than 800mm, 1250mm pipe length is greater than or unilateral level low pressure duct area of ??more than 1.2 m2, medium, high pressure air hose is greater than 1.0m2 project quotation, should take reinforcement measures; 3) irregular oval duct reinforcement clean plant, pipe execution should refer to the rectangular duct. 2, rectangular duct elbow production, generally should be used as a flat radius of curvature of the inner and outer concentric curved side bends. When using other forms of bending, flat edge longer than 500mm cooling room works, you must set the elbow deflector. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - Pipeline Project] metal flanged duct production should meet the following requirements: 1) air duct flange welds should be good fusion, full, no false welding and holes; flange flatness tolerance of 2mm, the same batch processing of the same size holes on the flange arrangement should be consistent and interchangeable. 2) wind pipe and flange connection using riveting riveting should be firm, there should be no de-riveting riveting and drain phenomenon; flange should be flat, close to the flange, its width should be consistent, and should not be less than 6mm; bite joints and corners There should be no cracks and holes. 3) wind pipe and flange welded pipe ends are not high winds and flange interface plane. Dust duct system, should adopt fully welded inside of the outer form of intermittent welding, duct flange interface plane away from the end face of not less than 5mm. When the wind pipe and flange connection using a fixed spot, the spot should be integrated well engineering, spacing should not exceed 100mm; flange and duct should be close, there should be no gaps or holes penetrating. 4) When a stainless steel or aluminum duct flanges using carbon steel shall conform to the specifications table provides 4 of Table 5, and should be done according to the design requirements embalmed; rivet material should be used with the same duct or no electricity chemical corrosion of materials. Plant ventilation engineering, Tianjin Engineering, Tianjin Jinzhong Ji ventilation engineering company by Tianjin Jinzhong Ji HVAC purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) strong, credible, in Tianjin fans, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the group into the brilliant and you work for a better future!