Laboratory water supply engineeringThe core design points revolve around three objectives: meeting experimental water quality requirements, adapting equipment water characteristics, and ensuring safety and scalability. It is necessary to focus on controlling the four dimensions of water quality grading, pipeline systems, safety protection, and flexible adaptation to avoid potential operational hazards in the later stages.
1. Water quality grading design: Matching experimental requirements is a prerequisite
There are significant differences in laboratory water usage scenarios (such as regular cleaning, precision instrument analysis, and cell culture), and the water supply system needs to be designed according to water quality standards to avoid "excessive treatment waste" or "substandard water quality affecting experiments".
-Clarify the water quality level: Different standards are corresponding to the type of experiment, such as * * Grade III water * * for ordinary glassware cleaning (conductivity ≤ 50 μ S/cm), * * Grade I water * * for high performance liquid chromatography (HPLC) (conductivity ≤ 0.01 μ S/cm, no organic pollution), and * * sterile ultrapure water * * for cell culture (ion removal+sterilization treatment).
-Split water supply design: Different water quality water supply systems are independently set up, such as tap water → pre-treatment (filtration, softening) → three-stage water system, three-stage water is then treated by reverse osmosis and EDI → first stage water/sterile water system, and the pipelines of each system are not interconnected to avoid cross contamination.
-Embedded water quality monitoring: Install online conductivity meters and TOC detectors at key nodes (such as primary water outlets) to monitor water quality in real time, automatically alarm when exceeding standards, and ensure the reliability of experimental data.
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2. Pipeline and equipment design: compatibility and stability are prioritized
The selection of pipeline materials, pipe diameters, and equipment matching directly affect the water supply efficiency and service life, and should be designed in conjunction with the water characteristics of experimental equipment.
-Pipeline material selection: To avoid material leaching and pollution of water quality, for example, UPVC pipes can be used for ordinary water supply, and * * 316L stainless steel pipes * * or * * PVDF pipes * * (resistant to chemical corrosion and free of metal ion leaching) are required for pure/ultra pure water. Galvanized pipes (prone to rusting) and ordinary steel pipes (prone to scaling) are prohibited from use.
-Pipe diameter and pressure adaptation: The pipe diameter is determined based on the instantaneous water consumption of the equipment. For example, a DN32 pipe diameter is required for large reaction vessels (instantaneous flow rate of 10L/min), and a DN15 pipe diameter is used for precision instruments (such as atomic absorption spectrometers, flow rate of 0.5L/min); At the same time, ensure stable pressure in the pipeline network (0.3-0.5MPa), install a stabilizing valve to avoid instrument damage caused by pressure fluctuations.
-Special equipment matching: For equipment with special requirements, such as high-temperature sterilization pots, * * high-temperature resistant pipelines * * (withstand 121 ℃ or above) need to be designed, and circulating water vacuum pumps need to be matched with * * closed circulation pipelines * * (reduce water resource waste), and separate valves and pressure gauges should be reserved for easy maintenance.
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3. Safety protection design: Avoiding leakage and pollution risks
Laboratory water often involves acid-base and organic solvents, and some areas (such as chemical laboratories) have corrosive environments. Safety protection design should cover "leakage prevention, corrosion prevention, and misoperation prevention".
-Leak prevention and drainage: The ground is equipped with a waterproof slope (slope 1% -2%) that slopes towards the floor drain. The floor drain is made of corrosion-resistant materials (such as PPR floor drain) and equipped with a water seal (to prevent harmful gases from flowing back); Key pipelines (such as pure water pipelines) are wrapped with a leak detection tape on the outside, which automatically triggers an audible and visual alarm when a leak occurs, cutting off the corresponding water source in the area.
-Corrosion prevention and protection: The water supply pipeline of the acid-base laboratory needs to undergo * * anti-corrosion treatment * * (such as coating the pipeline with anti-corrosion paint), and the valves should be made of acid and alkali resistant materials (such as PTFE valves); Emergency shut-off valves should be installed in the main water supply route and each partition to quickly shut down the water source and reduce losses in case of leaks or accidents.
-Anti cross contamination: The wastewater pipeline and water supply pipeline should be strictly separated, and the water supply pipeline should avoid being laid in parallel with the wastewater pipeline and gas pipeline (with a spacing of ≥ 50cm); The pure water storage tank adopts a closed design, and the respirator is equipped with a 0.22 μ m sterile filter membrane to prevent microbial contamination in the air.
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4. Flexibility and operation design: reduce the difficulty of later transformation
The laboratory equipment is updated quickly, and experimental requirements may be adjusted. When designing, it is necessary to reserve expansion space and simplify the operation and maintenance process.
-Reserved interfaces and space: Reserve * * spare water supply interfaces * * (with valves and plugs) on the side and wall of the experimental platform, with a quantity designed to be 1.2 times the number of experimental platforms; Water treatment equipment (such as reverse osmosis units) should reserve expansion space, and membrane components can be added later to increase water production.
-Convenient design for operation and maintenance: The pipeline layout should be installed along the wall and ceiling as much as possible (with aesthetic treatment), avoiding buried laying (difficult to maintain after leakage); Key components (such as filters and valves) are equipped with maintenance ports, with a height controlled between 1.2-1.5m (convenient for operation); Establish a pipeline routing diagram, label valve and interface positions for easy maintenance in the future.
-Energy saving and environmental protection: Adopting water-saving appliances (such as induction faucets and water-saving cleaning machines), the concentrated water from the pure water system is recycled to the ordinary water supply system (for floor cleaning), reducing water resource waste; Low energy consumption models are selected for water treatment equipment to reduce long-term operating costs.
In conclusion,Laboratory water supply engineeringDesign should start from experimental requirements, with safety and stability as the core, and balance flexibility and energy conservation. In the early stage, sufficient research should be conducted on experimental types and equipment parameters to avoid problems such as substandard water quality, pipeline leaks, and inability to adapt to new equipment in the later stage, ensuring the long-term efficient operation of the laboratory.