General provisions a clean room air system

  1.1 clean room construction and installation of wind systems should develop collaborative progress over the plan, cooperate with the civil engineering and other professional trades, coordination, according to the procedure of construction.
  1.2 clean room construction and installation of wind systems should follow not produce dust, no dust, no moisture and easy to clean principles.
  1.3 Clean Air system response before production and installation construction plans for review. Such as the need to deepen the design and construction units, design units should obtain written consent of the original.


Clean Air Installation System diagram

Two cleanroom air duct system and accessories production

  2.1 Duct production and installation of the plates, profiles and other major finished material shall meet the design requirements, and should have the factory inspection certificate. Should current national standards for acceptance when the materials approach.
  2.2 duct should use energy efficient, mechanized processing technology.
  2.3 In the finished product supply duct should be packing and shipping, and should have the material, strength and rigor of quality certificates, non-metallic duct should provide fire protection and health testing compliance certification.
  2.4 Wind Systems end filter (high efficiency filter) before the air duct material should be used in galvanized steel or galvanized steel coated oil. Duct material after the final filter is appropriate to better corrosion resistance of a metal plate or stainless steel plate. There are anti-corrosion requirements of the exhaust pipe should not produce dust, no less than the non-metallic plate flame retardant B1 level of production, the base has a surface layer, the surface layer should be of non-combustible material.
  2.5 galvanized steel galvanized layer should be at least 100, double the average of three tests shall not be less than 100g / m2, its surface without cracks, scars, scratches may not have obvious oxide layer, pinholes, pitting , peeling and coating off and other defects. Austenitic stainless steel should be stainless steel, its surface may not have obvious scratches, scars and pockets and other defects.
  2.6 duct sheet should be stored at a clean and dry. Stainless steel plate against the Qing Jian wood frame, stainless steel sheet, pipe and galvanized steel, pipes should not be in contact with the carbon steel cross, it should be set apart.
  2.7 air duct system produced a special site, its rooms should be clean and should be closed. Staff should wear clean, soft clothes and work shoes.
  2.8 roll sheet or flat sheet to use non-toxic cleaning solution in the production should be neutral and use water to clean the surface, there should be no phenomenon of powder coatings. No cover sheet can be used about 40 oil test of warm water, dry fiber filaments are applied can not afford to shoot white textile material wipe clean.
  2.9 stainless steel welding, weld application of low concentrations of detergent wipe.
  2.10 duct may not have lateral seam, rectangular duct bottom width of less than or equal to 900mm, its bottom may not have longitudinal seam, greater than 900m and less than or equal to 1800mm, and not more than a longitudinal seam.
  2.11 delivery harmless air duct, should snap molding. Duct plate stitching and sewing closed the circular duct may be single bite; elbow joints lateral connection seams can be established; rectangular duct forming a joint angle can bite stitch seams. Press the button should not be used duct seams. Seams, seam sealant must be painted or affixed seal tape, should be in positive pressure surface embodiment, the size of a small space or a special situation by force and motion controlled changing environment and transport special media, according to the design can be metal spiral duct or metal, non-metal hose.
  2.12 duct processing and installation tightness test pressure, manifold can be 1500pa, dry tube (including branch dry tube) can be 1000pa, manifolds can be 700pa; working pressure can also be used as the test pressure.
  2.13 snap and flanged metal duct should be before and insulation, according to the process carried out in Appendix A segment leakage detection method or according to the current national standard "Ventilation and Air Conditioning Engineering Construction Quality Acceptance" GB50243 rubber seal gaps in the future were dry pipe leakage detection systems and competent. 1-5 cleanliness of the environment should all be duct leakage testing, duct 6-9 clean environment to deal with 30% of the duct and at least a leakage detection system. Test results should meet the following two Tightness Index:
   
A unit Duct Leakage developed area should comply with Table 5.2.13-1 of.
Table 5.2.13-1 metal snap rectangular duct unit launched the largest amount of air leakage [m3 / (h.m2)]
The maximum amount of air leakage form
NOTE: circular metal snap and flanged duct and non-snap illegal flanged duct air leakage by 50% calculated value in the table.

B calculated by the amount of air leakage from the paragraph 1 of this system come to allow air leakage rate shall comply with the provisions of Table 5.2.13-2
Table 5.2.13-2 system allows air leakage rate ε (Leakage Rate / design air volume)
The system allows air leakage rate

  2.14 emissions containing harmful chemicals and pathogenic biological aerosol aerosol air duct applications welded, and shall not be less than the test pressure of 1.5 times the working pressure test, leakage amount should be zero.
  2.15 material collection exhaust pipe should be non-toxic material, no adsorption, corrosion, should adopt a low-carbon stainless steel; food grade, medical grade tubing should be 304 or 316 stainless steel. Piping should be straight, to avoid dead ends, blind control, import and export of pipe connected to the fan airflow should be done smoothly.
  2.16 duct inner surface should be smooth, not be in the duct equipped with reinforced frame and reinforcement bars.
  2.17 should open from the mains connected manifolds, manifold manifold should be adopted on a three-way or four-way lofting making the overall structure, the adapter should be filtered at the solitary round or bevel.
  2.18 processing galvanized steel duct should not damage the galvanized layer, if damaged, corrupted place (such as seams, folding, welding, etc.) should be of high quality anti-rust paint brush twice.
  2.19-bolt flange and pipe fittings welding or gas welding shall not be used punched holes at the anti-corrosion paint should be brushing twice.
  2.20 and angle flange connection duct, the duct flange should be flat, and close to the flange width of not less than 7mm, and cut the overlapping portion of the flange cracks and holes should sealant.
  2.21, when used with five and above five occasions when the level of cleanliness, bolt holes and rivet holes on the pitch pipe flange angle should not be greater than 65mm, when five of the following should not be greater than 100mm. Thin-walled flange spring clip spacing should not exceed 100mm, top Szymborska spacing should not exceed 100mm. The four corners of the rectangular flange bolt set, flange joints should be avoided gussets bolt holes. Bolts, nuts, washers and rivets should be galvanized. If you must use blind rivets may not be used at the end of the closed end of the product, and should head rubber seal on the end.
  2.22 through three filters (at the end of high school grade or sub-high efficiency filter efficiency) in fresh air, return air on safe bacteria and dust pass rate once again by weight by cleaning air conditioning systems were less than 10%, the upper duct should not open the cleaning holes. When the above conditions may not have the open hole in the duct cleaning, sweeping hole is provided in each of 20m-30m long straight pipe ends, the cleaning hole door should be tightly sealed, insulation. Before and after the filter pressure taps should be located measuring dust, dust measuring pressure taps must be closed after system installation.
  2.23 plenum fixed frame and high efficiency filter holder, the valve and the exhaust port moving parts, fasteners, control rods, etc. should be galvanized, nickel to be embalmed.
  2.24 ducts and components production is completed shall be wiped clean, and shall all openings sealed with plastic film bag mouth.


Wind systems 3.jpg

Wind three clean room air system pipe installation
  
  3.1 duct should be installed after the completion of civil work, and advised on other pipeline installation. Installation personnel should wear clean overalls, gloves and work shoes.
  3.2 flange gasket should be used in good elasticity, airtight, did not produce dust, porous and closed cell material. Shall not use latex sponge, foam, cardboard and other produce dust containing open porosity and easy, easy to aging of materials. Gasket thickness is preferably 5mm-8mm, a flange gasket system performance and size should be the same. Shall gasket surface paint brush.
  3.3 flange gasket should reduce joints, joints should be stepped lip or enterprises and to avoid the bolt holes may also be continuous irrigation plastic molding or stamping integrally molded gasket.
  3.4 Tightening torque flange bolts should be the same size, and respond to gradually tighten, said there should be no tightening uneven phenomenon after installation.
  3.5 flexible short tube should be used flexible, smooth surface, does not produce dust, airtight, no static and have a stable strength of flame retardant materials production, installation should be an appropriate degree, without distortion. Installed in the vacuum section of the flexible pipe should be short at the taut state, should not be flat deflated phenomenon. The short length of the flexible tube is preferably 150mm-300mm, located in Yi-shaped seam structure flexible short tube length appropriate for the movement joint width plus 100mm or more. May not be flexible short tube as a leveling or alignment of the connection pipe adjustable tube.
  3.6 When the flexible single short useful materials, glossy should inwards. When the inner tube temperatures below the dew point of the outside temperature tube under conditions of use, should take measures or adopt finished with a heat-insulating insulation layer. Flexible material such as using double short tube, inner and outer surfaces should be smooth.
  3.7 Duct and parts should be disassembled seal during installation, and should be connected immediately. When the construction is stopped or completed, the port should be sealed, if the installation seal membrane is damaged, the inner wall of the duct should be installed before then wipe clean.
  3.8 duct when passing through fire, explosion and other partition walls or floor should be set embedded pipe or protective sleeve. Embedded pipe or steel protective casing wall thickness not less than 1.6mm, the gap between the duct and the casing of the application on the sound incombustible flexible material block, then sealed with a sealant, the surface should be the final decorative treatment .
  Metal casing must Outsourcing 3.9 nonmetallic duct through the wall. When hard PVC duct straight segment connecting a length greater than 20m, there are soft PVC production of expansion joints, both of which should be soldered connection
  Exhaust pipe 3.10 wet areas should be located not less than 0.3% slope, aspect discharge direction, should be established at the end of the condensation water collecting device.
  3.11 Wipe the inside surface of the duct should afford fiber filament white textile material.
  3.12 duct system may not be as another load of hanging racks, weight branch duct shall bear the trunk, air-terminal should be set independently the adjustable hanger
  3.13 Duct insulation should not be used easily broken, dregs and have a stimulating effect on the human body material.

Four clean room air system components and accessories installation
   
  4.1 damper, muffler and other parts of the installation should clear the surface of the oil and dust.
  4.2 fold rotation axis through the valve body to be concentric with the body, during which shall be provided to prevent leakage of the seal. Part surface of the valve should be galvanized, chrome or spray, blade and seal surface should be smooth, the opening angle of the blades should be clearly marked. Lever valve should not be installed at the wind tunnel tee.
  4.3 duct work installed at both ends of a given pressure, VAV valve, the valve should be greater than the difference between the starting pressure valve. Straight pipe length before and after the entrance of not less than the fixed air flow valve products require installation length, same as the installation directions and instructions.
  4.4 damper valve adjusting device should be set for operation and maintenance of the site, and should set up a separate branch, hanger. Must check the condition of the fusible member is fixed after installation. When necessary fusible element can also be installed after the installation is complete. When the valve is installed in the ceiling, you should check the status of valve opening and closing and manual reset opening checkpoints in the prone position.
  4.5 muffler, bend muffler installation should set up a separate branch, hanger.
  4.6 pairs requires constant temperature system, muffler housing and duct insulation should be treated.
  4.7 perforated plate muffler opening glitch should file level.
  4.8 muffler muffler filling material should not produce dust, can not afford Tan (fiber), does not absorb moisture, pollution, loose material shall not be used. When anechoic material is a fibrous material, the fibrous material is a felt-type material and should be covered with packing material to prevent penetration of the fiber. Should not be used in the foam and glass wool.
  4.9 muffler straight section should be installed on a smooth flow of straight pipe.
  4.10 air conditioning system insulation construction should be qualified Tightness test performed.
  4.11 duct insulation materials and components shall be qualified inspection certificate of non-combustible material, it is appropriate plate paste form, and should be a vapor barrier.
  4.12 can not open holes and bolts on the insulating layer. Insulation measures and cleaning valve hole should not impede its switch.
  4.13 When the insulating duct located outdoors, the sun should be added in a tube outside, rain protective shell.


Clean room air system


Five cleanroom air ventilation system installed
 
  Environment 5.1 installation system at the new outlet should be clean, new air from the outside bottom of the ground should be greater than 3m, the new outlet should be less than 6m above the air vents. When the new outlet, air vents at the same height on the same side, two vent horizontal distance of not less than 10m, the new outlet exhaust vents should be located upwind side.
  5.2 outermost end of the entrance of fresh air due metal insect screens, and should be easy to clean dust on it, sediments. The new air inlets should take rain measures, net ventilation area over speed within 5m / s.
  5.3 install new air filtering device should be easy to replace the filter, check the pressure display or alarm device.
  5.4 louver blades should be firm on the return air to the installation, should to be closed, effective ventilation area indoor return air ventilation rate should be less than 2m / s, corridors and other places within 4m / s. When there are more stringent noise requirements, it said speed should be within 1.5m / s and 3m / s or less, respectively.
  5.5 Installation and location should be easy to replace the return air return air filter.
  5.6 On the back, there are air vents safe and efficient transition the cleanroom and bio-safety cabinets and other equipment, application site before installing leak detection equipment for high efficiency filter leak scan, and should confirm the seamless installation. Back exhaust port after installation, zero leakage of the border sealed structure, its borders should be scanned leak, and should confirm seamless; when it is not on the border of scanning leak detection, biology, etc. must be specially evaluated.
  5.7 When the back, install a dynamic airflow seal the exhaust port when the exhaust system should be pressurized to take over and then the mouth is firmly connected, differential pressure gauge should be installed in the exhaust system near the visual height. Exhaust means high efficiency filter leak should be scanned at the device and make sure that no leakage into the device and then Ann.
  5.8 When the return air through the exhaust port containing a high risk of biological aerosols, clean room disassembly in rebuilding their return, must be sterilized before the exhaust air filter, the staff body should be protective measures.
  5.9 When back, the exhaust filter is mounted on the wall and Ann have a folder scanning leak detection devices, clip-wall clear width of not less than 0.6m.

Six clean room air system installed air-terminal devices
  
  6.1 air filter or air-terminal end of the device should be used as the end of the filter pre-filter is installed and running on the system and new air filter system, air-conditioning equipment for clean room installation space and ducts conduct a thorough cleaning of the 12h after blowing air duct installation.
  6.2 air blowing system, should close the new outlet by circulating air and return air setting is equivalent in effect filter pre-filter unit, after the completion of the withdrawal of the whole wind blowing time and space.
  6.3 air blowing should be finished once again cleaning, wipe clean room, and then immediately install the sub-high efficiency filter or high efficiency filter or air filter with such an end-device.
  6.4 installed before the end of the air filter or air terminal device celebrate stored in a clean room, and the manufacturer's mark shall direction aside, should not be stacked more than three.
  6.5 air filter or air-terminal end of the device can not be removed before installing the package. After removing the packaging, first check the following:
a check product certification, factory inspection report, which should be efficiency, resistance and measured data scanning leak detection, may not filter Category-defined data instead.
b should be visually checked for damage should include; compliance with the design requirements of various sizes; frame whether the glitch and rust (metal frame); wind turbine installation with fan is reliable, rotation is normal; with decorative mesh or stop leak layer, decorative network or leakage barrier layer is intact, taut.
  6.6 air filter before the end of the installation, you should check the filter carrier frame opening size again, opening size no larger than the inner end of the air filter frame trim size.
  6.7 is used to filter biological aerosols as the main purpose, five or five more air clean room or have special requirements of the end or the end of the high efficiency filter device is installed, it should be carried out by one spot scanning leak detection, and should qualified .
  Level 6.8 of 5 or less to filter non-biological aerosols as a major clean-room air filtration efficiency should be scanned leak site after the end of the device or its installation, leak detection ratio of not less than 25%. Scanning efficiency filter leak detection execution according to Appendix E approach.
  6.9 Off baby child adoption between the end of the filter and the frame gasket sealing, vacuum sealing, tank seal, seal and dynamic airflow when bicyclic sealing method, should be filler surface, the surface of the filter frame and the frame surface and the tank Wipe clean. It shall be between efficient border and frame filter direct coating sealed.
  6.10 using gasket, the compression ratio should be 25% -30%, the gasket can not be crushed. Gasket material and joint type shall meet the specifications - 5.3.2- 3.3 requirements. When seized with a screw, briquetting pressing gaskets, corners should be pressed, can not only push the border midpoint. When the filter frame length dimension greater than 320mm, should at least adopt the four corners of 8:00 pressed.
  6.11 When using tank seal tank at the height of the liquid level should meet the design requirements or groove depth does not exceed 2/3 of the framework of the seams may not have osmosis; with double-loop seal, the seal should not paste eyelet ring cavity on the block; bicyclic seals, vacuum seals, dynamic airflow seal should remain negative or positive pressure tube, smooth groove; with leakage barrier layer, and fan filter units (FFU), borders do not apply glue seal , should be set up so that it is naturally soft barrier compressed state.
  6.12 install air filter end, and airflow direction arrow on the frame must be consistent, when vertical installation (including stacking), paper crease joints should be perpendicular to the ground.
  6.13 efficient and sub-efficient filter installation, interior shall not carry out with dust dust production operations will be installed after the application of plastic film outlet side letter, not yet on the diffuser plate and other decorative pieces.


The above summary is Ed purification technology cleanroom air system, air duct installation, "clean room construction and inspection standards" chapter of the wind system