Cover outtake performance can be divided into four points: 1, the emissions of toxic or harmful gases inside the drainage channels out to meet hygiene requirements; 2, outtake to complement fresh air to the reservoirs, water tanks and drainage channels, in order to reduce the metal tube corrosion and prolong life; 3, reservoir, tank vent pipe in order to improve the capacity of the drainage system should be set up more than two (take a small example, an intravenous drip when the bottle down the liquid will flow, must be inserted a ventilation tube, one end open to atmosphere, and to pass the gap between the liquid surface and the bottom at one end, to prevent the negative pressure is formed within the pipe, to ensure smooth drainage) preventing backwater formation and odor, reduce the amplitude of the fluctuations in air pressure, protection of the water seal, preventing water seal destruction. 4, can quickly reservoir and water vapor in the tank and harmful gases discharged built-the gauze gauze effectively prevent prevent vector, insects and dust to enter in order to destroy the water quality. Third, the hood-type outtake Specification Model: Z-200, Z-300, Z-400, Z-600 Height: H3 = 0, H3 = 500 H3 = 1000 Z-200, the height H3 = 0 890, H3 = 500 height 1380 H3 = 1000 height 1890 Z-300 H3 = 0 height 1000, H3 = 500 height 1500, H3 = 1000 height 2000 Z-400 H3 = 0 height 1120, H3 = 500 height 1620, H3 = 1000 height 2120 Z-600, H3 = 0 height 1450, a height of H3 = 500 1950, H3 = 1000 Height 2450 four cover type outtake Description 1, the design of the ventilation tube gas velocity of 5 m / s, filtration (fabric) layer of the network, the average gas flow rate of 0.75m / s, filter cloth should be installed using the same material to be stitched, the inner cover can be used a non-toxic non-metallic material; outtake by overburden thickness (H3) 0.0m, 0.5m, 1.0m three kinds design, 0.0m applies to the southern region, 0.5m applies to the central region, and 1.0 apply to cold regions. 3 after welding rust, anti-corrosion requirements based on customer design requirements. Conditionally regional ventilation cap FRP or stainless steel material produced according to the design requirements, in order to achieve a better anti-corrosion and extend the service life. 87GD 2000 version of the thermal power plant soda pipeline parts and components, piping miscellaneous components, hydrophobic useful multi-stage orifice plates, hydrophobic useful three, four, six, eight orifice plates, single-stage section orifice plate, single-stage throttle lever to pump recirculation multi-stage throttling device; boiler exhaust pipe hydrophobic plate; 2, Water Pipe to the displacement indicator;, drainage funnel, covered drainage funnel lid round -shaped funnel, a square round drainage funnel, a circular funnel, rectangular circular funnel; 4, the steam pipe vermicular up measuring points (MEA), the steam pipes automatically heart vermicular up measuring points (MEB); 5, condensate pump inlet filter net, feed pump inlet filter feed pump inlet strainer (withdrawable); flow indicator (flange connection, threaded connection); hydrophobic collector; 8 series valve intermediate washer components; 9 10, corrugated compensator; 11 sprocket valve gear, easy to take a long stem valve gear, handwheel connection, direction transform box, universal joints, with expansion joints universal boiler exhaust pipe sleeve compensator; fittings, pipe valve gear. Second, the smoke air pulverized coal pipeline components D-LD2000 standards; 74DD standard circular flanges, rectangular flange, duct welding elbow; the 2 fan import bellows, Exhaust Fan imports bellows; plate inserted single the core shrinkage adjustable, balanced dual-core adjustable shrinkage, split dual-core adjustable shrinkage; 4, double pallet Blender negative pressure Blender; 5 round damper side damper , circular blast doors, beveled explosion-proof door; arranged horizontally the gravity blast doors, vertically arranged gravity explosion-proof door; 6 coal purge holes, round wall poke coal hole, the circular welded manhole round insulation manhole, rectangular manholes rectangular insulation manhole, flue ash removal hole; steel pipe fittings 02S403 building standards series: 1, elbow, tapered Reducing elbow, three-way, four-way, reinforcing three-way reinforcing four pass, pipe reducer, eccentric reducer, bell, steel flanges; single flange pipe limit expansion joints, double flanged pipe Transmission Joint, a single flanged pipe expansion joints; 3, bends outtakes, cover outtake; steel bell, tube of absorbent speaker, the absorbent speaker tube bracket.