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1. Installation requirements for temperature and pressure compensation of pitot tube flowmeter
The core requirements for temperature and pressure compensation installation of pitot tube flowmeter can be summarized into four dimensions: cleanliness, stability of straight pipe section, installation concentricity, and pressure pipe specifications of the process management bureau.
1. Preparation for Process Pipeline Cleaning Before Installation: Thoroughly flush and blow the pipeline before construction to remove impurities such as welding slag and rust, and prevent blockage or wear.
. Filter installation: Install a filter at the front end of the flowmeter to intercept residual particles in the fluid and ensure measurement stability.II. Pipeline Installation Specification 1 Requirements for straight pipe section: At least 3 times the diameter of the pipe (3DN) upstream and 1DN downstream. When the flow velocity distribution is uneven, a flow regulator needs to be added. two Pipe diameter matching: The inner diameter of the Hui lead connecting pipeline should be strictly consistent with the diameter of the flow meter, and the flange connection should avoid gaskets or welds protruding into the inner wall of the pipeline. three Inner wall treatment of pipelines: New pipelines must meet the roughness requirements, and if they do not meet the standards, they can be coated or machined; Regular cleaning of old pipelines to prevent the deposition of media.
III. Installation of flowmeter body 1 Concentricity and perpendicularity: Ensure that the centerline of the flowmeter coincides with the axis of the pipeline, and the perpendicularity deviation of the throttling element is less than 1 °. two Flo
Section 4: Installation of Pressure System 1 Location of pressure tap • Gas: pressure tap at the top of the pipeline • Liquid: pressure tap below the horizontal centerline of the pipeline (not directly below) • Steam: pressure tap on the side of the pipeline and equipped with a condenser tank 2 Laying of pressure pipes - total length 3-50 meters, transition with gentle rounded corners at sharp bends - maintain a 1:10 slope, tilt gas pressure pipes upwards, tilt liquid pressure pipes downwards - insulation and antifreeze throughout the entire process, parallel laying of positive and negative pressure pipes at the same height Differential pressure transmitter layout • Liquid measurement: The transmitter is installed below the throttling device • Gas measurement: The transmitter is located above the orifice plate • Steam measurement: High temperature steam is isolated through a condensing tank
5. Sealing and calibration. All pressure pipe interfaces need to undergo airtightness testing. After installation, the zero drift should be calibrated with a standard flow source. If the error exceeds 0.5%, the concentricity and sealing status should be readjusted.
2. What is a pitot tube flowmeter? A pitot tube flowmeter is a differential pressure flowmeter.
. The following is a detailed introduction to pitot tube flowmeter: Working principle: The working principle of pitot tube flowmeter is based on B