Cleanroom water systems, water treatment requirements and testing, "clean room construction and acceptance of" the water system articles

General provisions a cleanroom water system

  1.1 Construction of the water system clean room containing process water systems, construction and acceptance of air conditioning water system and the local domestic water system water supply and drainage system.

Two cleanroom water system water system

  2.1 contaminated area in particular microbial contaminated areas of water supply, water may not be directly connected to the device, you must have an air barrier, with overflow outlet should be above the water level device, the interval should not be less than 2.5 times the outlet diameter. In the water points and water piping should be installed high pressure backflow prevention device, also located on the water supply pipe shut off valve to prevent backflow of water pipe and valve should be located in a clean area.
  2.2 clean water supply pipeline zone should be painted eye-catching colors, or hanging out a shingle, species within specified piped water, use, flow and so on.
  2.3 domestic water system should not be made of galvanized steel, optional plastic water pipe, stainless steel pipe, seamless steel tubes, water technology and air-conditioning system should use seamless copper tube, polypropylene pipe, stainless steel, and shall be welded or fast interface connection.

Cleanroom water system
        (Cleanroom water treatment systems)

Three cleanroom water systems drainage system

  3.1 polluted especially pathogenic microorganisms heavily polluted areas drains should set clear, smooth wall, and maintain a certain distance from the wall inspection and maintenance. Highly pathogenic microbial contamination of the drain line should be established transparent casing.
  3.2 contaminate drains should have sufficient strength and corrosion resistance. Drains usable chemical to bacteria polypropylene, polyvinyl chloride material.
  3.3 pathogenic microorganisms such as polluted drains with automatic valve, manual valve should be located in its front and rear, where and how the valve is installed vapor and other gases sterilization conditions should be used. 3.4 pipeline layout should meet the design requirements. When the design is not explicitly requested, the pressure to gravity flow drainage pipes should avoid; annex little more pipeline should avoid attachment pipe.
  3.5 pathogenic microorganisms polluting discharge line of the roof vent pipe should extend from the stand on the ground should be more than 2m, do not receive clean area; perimeter should be well ventilated and away from all air intakes. Installation location and manner exhaust HEPA filter should be easy to repair and replace them. Drain snorkel room for different purposes should be separate. Vent access shall not purify exhaust pipe air conditioning systems.
  End 3.6 pathogenic microorganisms polluting drains should be set on the examination of water samples sampling port, sampling port should be strict measures to seal.
  3.7 pathogenic microorganisms polluting drains through the wall of the place, should not shrink, does not burn, dustproof materials for sealing.
  3.8 floor drain installation should be smooth, firm, without leakage. Floor drain should be below the top elevation of the ground attachments 5mm-10mm. Floor drain must be closed after installation.

Four cleanroom water system hot water system

  4.1 Life and clean with hot water insulation measures installed should be able to maintain the storage temperature of not less than 60 degrees. Or cycling temperature conditions in more than 51 degrees.
  4.2 As a disinfection device with the installation of hot water insulation measures should be able to maintain the storage temperature of not less than 80 degrees, or cycling temperature conditions above 65 degrees.
  4.3 mix all with hot and cold water thermostat valves should be installed at the outlet.

Cleanroom water system
         (Cleanroom water system)

Five cleanroom water system purified water and high purity water

  5.1 installation process with purified water and high purity water treatment equipment shall meet the following requirements:
  install a purification treatment equipment shall meet the design requirements, should comply with the relevant provisions of the existing national standard "electronic grade water" GB 11446.1 and the like.
  b Water Purification process technology layout and installation should be reasonable, safe, convenient and beautiful. You must install the load-bearing safety check.
  ground, purified water of c-channel and station equipment must be treated with preservatives, they should have first aid kits fixed placement locations.
  d sand filters, activated carbon filters and ion exchanger installation should remain vertical. Membrane filters, reverse osmosis systems, ultrafiltration systems and electrical regeneration ion system base frame should be placed horizontally.
  e catchment filter cap should be firmly fixed without fouling.
  f filter in all media should be the amount of investment, pave, rinse, after all was added backwash, backwash time on the sand layer should be 1h, activated carbon should 2h. And shall then flushing 30min.
  g ion exchange resin according to the design requirements for the installation.
  h reverse osmosis membrane pressure vessels exchange available glycerol as a lubricant, but may not use grease.
  should be thoroughly cleaned before i membrane filtration equipment installation equipment piping, must not have particles into the membrane.

  5.2 purified water and high water pipes before fittings, valves should be installed to remove oil and degreasing treatment.
  5.3 pipes, fittings prefabricated, assembly work should be in a clean environment, the operator should wear clean uniforms, gloves posts.
  Around 5.4 when mounting or stop working, high-purity inert gas shall be filled, and shall be clean sealed plastic bag, seal the bag damaged if it is found to be timely check processing.
  5.5 purified water and high purity water (including water for injection) piping and pure steam piping made of stainless steel (SUS) tube, the pipeline processing, installation should meet the following requirements:
  a stainless steel tube in the stacking process, should not be in direct contact with carbon steel stent cards, plastic or rubber gasket should be isolated.
  b pipe connection should be used welding, welding ring loose flange and convex flange connections.
  e welding should adopt automatic welding, filling the inner tube of pure argon gas (99.999% purity) until welding, purge is completed. Wall to cool before degreasing with carbon tetrachloride, and then closed the nozzle. Welding direction consistent with inflatable air flow direction.
  tack welding can be used manually d piping components tungsten arc welding, argon until the wall should be cool.
  No preference when e design, flange gasket should adopt non-metallic Teflon or soft PVC boards. Flange fastening bolts should be stainless steel.
  f welding personnel should have appropriate qualifications, before welding construction should be asked to make a sample, and should, after inspection posts.
  g piping systems shall be installed with all segments of the flow characteristics of stagnant water, the system installation should be not less than 0.5% of the slopes. System piping and installation of all equipment should have the residual water emptying capacity.
  h pipe welding, after installation, should the tube weld oxide rinse, and then acidified skim and passivation, and documented.

  5.6 pure water, high pure water pipe when using segregation fluoride (PVDF) pipes, should comply with the relevant requirements of Article 6.3.6 specification; when using hard polyvinyl chloride (PVC) pipe, polypropylene (PP) pipes and plastic When (ABS) pipe, which pipe processing, installation should meet the following requirements:
  a pipeline processing, should be installed at room temperature 5 degrees, relative humidity of 85% or less of a clean environment were.
  b pipe connection should adopt bonding, welding, flat welding flange connection and union connection.
  c pipe or fittings socket should not skew and uneven thickness. There should be no cracks in the pipe end. Pipe socket gap should not exceed 0.3mm.
  d pipeline before bonding, the bonding surface response scrub and cleaning. Shall contamination. Keep away from sources of ignition. Adhesive coated on the socket, should be at least 2 times. Should ensure that the insertion depth of the socket should be maintained after 20min reach the required insertion depth.
  e took the pipe unions should adopt bonding, welding or threaded connections.
  f When laid underground, treated or disposed respond cushion simple trench; when installed on the ground, should be fortified guard.
  When g pipe welding or welded flange connections, automatic or semi-automatic heat welder. Depending on the thickness of the pipe flanges should be processed groove. The weld shall be filled, and higher than the surface of the tube 2mm-3mm, the width of the uniform, there should be browned, breaking, Weld and other defects. Weld strength not less than 60% of the base metal, weld material should be the same as the base material. Different pipe wall thickness, the attachment can not be welded.
  h PVDF pipe welding should be uniform double weld bead width is determined by the wall thickness should not be less than 2mm.
  i piping support and hanger should be high in the pipe joint weld. All valves should support bracket. Should fill in between the sticks, pipe hanger and separate soft insulating material
  When j through building envelope, should be set casing, there should be joint inside sleeve.
  k straight pipe length exceeds 20m, telescopic tube should be installed.

  5.7 pure water, high pure water piping system pressure after passing the test should be carried out before the system is running tap water, rinse speed should be more than 2m / s, until the same before and after the rinse water quality. After washing should then be 10% hydrogen peroxide disinfection cycle stage than 4h, then washed with water until the water quality before and after the reverse osmosis meet the design requirements.

Acceptance of six sub-cleanroom water system

  6.1 Water System breakdown acceptance should meet the following requirements:
  a water system piping systems shall be itemized acceptance inspection lot or sub-projects respectively.
  b Sub-acceptance required special test, test units shall be qualified to assume the experimental work, or to participate in experimental work by the supervisors.
  c should be acceptance of the following documents:
  ① purified water system flow chart;
  ② purified water system equipment layout plan;
  ③ electronic control system schematic;
  ④ electrical wiring diagram;
  ⑤ pipeline Trend Graph;
  ⑥ cleaning and disinfection records.

  6.2 Water System breakdown acceptance should include the following main items:
  a pipe, fittings and construction methods should meet the design requirements.
         Inspection method: check the file record. Number of Inspection: All
  b pipes, fittings, valves, and other group-on, should be done inside and outside wall flush, stainless steel tube, PVDF pipes Group gap difference not greater than 0.2mm; non-metallic pipe no greater than 1mm; socket clearance to meet the requirements.
            Inspection method: flat feet, and observe the checking feeler amount. Number of inspection: checks 30%, at least one system.
  c weld inspection data samples meet the design requirements.
            Inspection method: check inspection reports. Number of test: All.
  d pressure piping should be pressure tested, the test pressure of 1.5 times the working pressure and maintain 30min no leakage.
  e purified water system should also be open to the maximum number of water distribution points to reach the rated flow circulation system to meet the design cycle traffic.
            Inspection method: observation inspection. Number of Inspection: All
  f operating temperature of the hot water pipes should flow under test, and maintain 30min no leakage.
            Test method: Field test pressure test. Number of inspection: checks 30%, at least one system.

Shandong Ed summarized above or cleanroom water purification systems, water treatment requirements and testing, "clean room construction and acceptance of" the water system articles.