Key points of quality control of thermal instrument installation engineering

Abstract: The key points of quality control of thermal instrument installation engineering are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Construction requirements of control panel, table and cabinet 1.1 During the transportation and installation of the panel, it is not allowed to damage the paint layer of the panel and the completed civil works such as the corners of the ground and walls. 1.2 The control panel, table and cabinet shall be firmly fixed with bolts. 1.3 Do not lead on the panel and cabinet after installation. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the quality control of thermal instrument installation engineering. 1. Construction requirements for control panels, tables and cabinets 1.1 During the transportation and installation of the panel, it is not allowed to damage the paint layer of the panel and the completed civil works such as the corners of the ground and walls. 1.2 The control panel, table and cabinet shall be firmly fixed with bolts. 1.3 After the panel and cabinet are installed, no work that causes severe vibration shall be performed on it. 1.4 The panels and cabinets should be clearly grounded, and the grounding should be firm and reliable. 1.5 The power circuit in the panel is well insulated. 1.6 The connecting bolts between the panels are complete and fastened, and the connecting bolts of the busbars in the panel and the cabinet are tightened with the specified torque wrench. 1.7 The levelness, verticality and clearance between panels and cabinets should meet the standard requirements. 2. Instrument pipe laying 2.1 The position of the primary door should be convenient for operation and maintenance, and meet the design requirements. 2.2 When the secondary door, sewage door and balance door are centrally installed, maintenance and operation are required. 2.3 The internal cleaning and purging should be carried out before the instrument pipe is laid, and the purging should be carried out before the tightness test. 2.4 The thermal expansion of the main equipment and the pipeline must be considered for the pipeline, and compensation measures should be taken to ensure that the pipeline is not damaged. 2.5 When the instrument pipe is laid horizontally, it should have a certain slope and the direction is correct. The differential pressure pipeline is greater than 1:12, and the pressure pipeline is greater than 1:100. 2.6 The steam and water pressure pipelines should be laid to avoid up and down.“U”type bend. Occurs in special circumstances“U”When bending, the exhaust valve should be installed at the highest point, and the drain valve should be installed at the lowest point. 2.7 Spacing of horizontal pipe supports: 1-1.5m for steel pipes, 0.5-0.7m for copper pipes and plastic pipes; spacing for vertical pipe supports: 1.5-2m for steel pipes. 2.8 The pipeline must be fixed with detachable clips. 2.9 Temporary signs should be put up during the construction process, and formal signs should be put up after the construction. The signs should be neat, beautiful and clear. 3. Shielded cable wiring 3.1 The shielded cable must be laid according to the design model and cannot be replaced. 3.2 The shielded cable should be grounded at one end, and the grounding should be uniformly specified to the panel side of the centralized control room, and float on the spot. 3.3 If the shielded cable has an intermediate joint, the shielding layer should be connected well and the insulation should be handled properly. 4. The temperature and pressure sampling openings 4.1 The sampling position should meet the requirements of the drawings and be convenient for installation and maintenance. 4.2 Machining should be used for opening holes on pressure pipes and equipment; oxygen cutting can be used for opening holes in air and smoke pipes, but the holes should be rounded and filed. 4.3 InΦWhen installing the temperature measuring element on the pipeline below 76mm, the method of installing the expansion pipe should be adopted. 4.4 When openings are required on closed pipes or equipment, measures should be taken to prevent iron filings from falling into them. 4.5 The sampling pipe from the pressure sampling point to the primary door should be less than 10m. 4.6 The oil-free compressed air branch pipe should be led out from the upper half of the main pipe. 5. When installing the temperature measuring element 5.1 When welding the element socket, the element core must be pulled out, and then loaded after cooling. 5.2 Thermal resistance insulation inspection should be greater than 0.5MΩ. 5.3 Component terminals are connected to the fixed protective nozzle, and the cable should have sufficient length for expansion of the thermal system. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Key Points of Quality Control of Thermal Instrument Installation Engineering'

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