【 Weak current College 】 chilled water system construction description

1) tubing: the air conditioning and hot water systems for the return pipe DN < 50 with welded steel tubes. 50 <=DN<250采用无缝钢管,DN> = 250 with welded steel pipe spiral seam. Condensation water pipes using hot-dip galvanized steel. Air conditioning water dry pipe connection each blower coil Unit Department of pipes with brass or stainless steel corrugated hose.
2) valve components: water systems all valve parts bearing should meet the requirements of the system working pressure. Conditioning system valve when the pipe diameter DN ¡ü 50mm, globe valve; when the diameter DN 65 ≤ < 150mm, wafer or flanged butterfly valves, pipe diameter DN ¡ü 250mm, single-clip or flanged butterfly valves. Air-water system of automatic discharge valve should be made of brass.
3) pipeline laying: except otherwise stated in the figure, air-conditioning condensation water tube anemometer spare tube I ≥ 0.01, dry pipe grade I > 0.005. Chilled water system pipe laying installation, regardless of whether or not indicated in the figure, the highest point and the lowest point of the exhaust and should be installed separately. discharge device Condensation water levels in the beginning dry tube set to remove. Pipeline through walls and floors should be set. Installed in the floor to the top of the casing which should be higher than the ground floor at the bottom and 20mm, face flat bottom; installation in the wall of the tube, the ends should be flush with the veneer; continuous thermal insulation should be at the casing, insulation and pipe sealing paste between fill; through toilet kitchen, wet room, should fill real Yau Ma. Installed in the bathroom and the kitchen floor to the top of the casing, it should be higher than the decorative surface 50mm. Pipeline wear underground waterproof wall, using rigid waterproof casing.
4) pipeline cleaning: chilled water system before it is put into use must be flush. Rinse before installed on the pipe flow orifice, mesh, thermometer, control valve and thermostatic valve, removed, rinse and then loaded on competency. Pipe installation before cleaning to pipe internal and external dirt, after installation you should separate washing and then the whole system clean. Heating and air-conditioning systems should be used to wash, rinse water should be a system of maximum pressure and maximum flow until export color and transparency and the entrance to visually consistent is qualified. Pipeline flush qualified, and HVAC equipment (chiller, air handling units, cooling towers, pumps, fan coil units and radiator, etc.
5) pipeline coating: pipes, pipe fittings, bracket, containers etc. primer, you must clear the surface of the dust, dirt, rust and welding slag, etc. Pipes, pipe fittings, bracket and containers such as rust after coating antirust primer two road. (First antirust primer coat should be well before installation, hydrostatic testing qualified before the second coating antirust Primer). Ming installed without insulation pipes, pipe fittings and brackets, etc. and then coated silver powder paint or color enamel two road. Outdoor Ming installed and pipe trench in the pipeline, fitting, bracket and so should be coated with red lead phenolic antirust paint two road. Without insulation pipes, pipe fittings and bracket and then coated with phenolic resin enamel or asphalt paint two road. Air conditioning system of pipes in the paint or insulation, should the outer surface of the pipe marking pipe types, tube media flows and temperature, etc.
6) pipe insulation: air-conditioning and hot water supply-water pipes and air conditioning system with cooling water pipes are required insulation, thermal insulation material is nonflammable B1 level obturator rubber insulation materials. When the pipe diameter DN < = 50mm, insulation thickness for 25mm. When the pipe diameter 70 ≤ DN ¡ü 150mm, insulation thickness 28mm. When the pipe diameter DN > 150mm, insulation thickness 32mm.
Air-conditioning condensation water system pipe insulation thickness 10 mm.
7) air conditioning pipes through the Defense wall, floor, closed set sealed casing, casing pipe diameter is larger than the pipe diameter 40-60mm, air defense of medial set greater than 1.0MPa stop valve.