Purification workshop pipeline pressure test flushing
Purification pharmaceutical cleanroom pipeline pressure test flushing
After the installation of the air-conditioning water pipes in the purification pharmaceutical cleanroom, the water pressure test of the pipes should be carried out before the insulation. The pipe pressure tests are generally divided into two types: single pressure test and system pressure test. The pipeline in the hidden part is installed, and before insulation, according to the design and...
Text label: purification workshop engineering, purification workshop pipeline, pipeline pressure test flushing
Pipeline pressure test flushing in purification pharmaceutical cleanroom
After the installation of the air-conditioning water pipes in the purification workshop, the water pressure test of the pipes should be carried out before the insulation. The pipe pressure tests are generally divided into two types: single pressure test and system pressure test. After the pipelines in the hidden parts are installed, and before the insulation, the hydraulic test should be carried out according to the design and specification requirements. The location and piping system conditions, formulate a pressure test plan and technical measures, and connect the pressure test pipeline according to the pressure test plan; check whether the pipes, equipment, valves, fixed brackets, etc. in the pressure test system are in accordance with the construction drawings and design changes. All constructions are completed and meet the requirements of relevant specifications. Whether safe and reliable isolation measures have been taken for systems, equipment, instruments and pipeline accessories that cannot participate in the test, whether the pressure gauge used for pressure test has been validated, and its accuracy grade shall not be lower than 1.5. , the maximum scale value of the dial should meet the test requirements, whether the safety measures before the hydraulic test have been fully implemented.
The hydraulic test should be carried out in sections, the pressure gauge should be installed at the lowest part of the test pipe section; the water injection of the pipe network should be set at the lowest part of the pipe section, the end of each water pipe should be blocked from low to high, and the main inlet valve should be closed. And all the drain valves, open each branch and main valve, do not connect the water distribution equipment during the hydraulic test, open the system exhaust valve when injecting water, and close it after exhausting the air; when the pressure rises to the design specified test value, stop adding. If there is no leakage in the interface, valve, etc., continue to observe for 10 minutes, observe that the pressure drop is not more than 0.02MPa, and then reduce the pressure to the working pressure to check, no leakage and no leakage is qualified, check all systems, if there is Water leakage should be marked there, repaired, and then filled with water to test the pressure; after filling with water, pressurize, and use a pressure test pump to boost the pressure. The test pressure of cold and hot water and cooling water system, when the working pressure is less than or equal to 1MPa, is 1.5 times the working pressure, but the minimum is not less than 0.6MPa, when the working pressure is greater than 1.0MPa, the working pressure is added 0.5MPa; system pressure test After reaching the acceptance criteria, drain all the water in the pipeline and fill in the test record. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for purification workshops and dust-free workshops.
Before flushing the pipeline, the instruments in the system should be protected, and the orifice plate, nozzle, filter screen, throttle valve and valve core of the check valve should be removed and kept properly, and reset after the flushing is qualified. The equipment and pipes to be flushed should be isolated; the water flushing should be carried out at the maximum flow rate that can be achieved in the pipe or a flow rate of not less than 1.5m/s. Under the condition of not damaging the pipe, the welds, pipe bottom and other parts should be beaten with emphasis; Water flushing is qualified if the water color and transparency at the outlet are consistent with the visual inspection at the inlet; the steam system should be purged with steam, or compressed air can be used. Then naturally cool down to the ambient temperature, then raise the warm tube, and carry out purging at a constant temperature, which is generally not less than 3 times.
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