How to use a pitot tube

Abstract: The information on how to use the pitot tube is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. Pitot tube technical parameters: 1. The L-type pitot tube coefficient is between 0.99-1.01, and the S-type pitot tube number is between 0.81-0.86. 2. The measured air velocity does not exceed 40m/s, and the measured water velocity does not exceed 25m/s. 3. The maximum length of 8 pipes is 1500mm, and the maximum length of 10 pipes is 2000mm. 1. The L-type pitot tube coefficient is between 0.99-1.01, and the S-type pitot tube number is between 0.81-0.86. 2. The measured air velocity does not exceed 40m/s, and the measured water velocity does not exceed 25m/s. 3.Φ8 tubes up to 1500mm long,Φ10 tubes with a maximum length of 2000mm, (the company has various specifications of pitot tubes) Pitot tubes are used: in scientific research, production, teaching, environmental protection, as well as tunnels, mine ventilation, and energy management departments, pitot tubes are often used to measure ventilation pipes, industrial pipes, furnaces The airflow velocity in the kiln flue can be converted to determine the flow rate, and the water flow velocity in the pipeline can also be measured. Using a pitot tube to measure speed and determine flow has a reliable theoretical basis, is convenient and accurate to use, and is a classic and extensive measurement method. In addition, it can also be used to measure the pressure of fluids. Pitot tube structure: The L-shaped pitot tube is made of two different straight stainless steel pipes concentrically sleeved. The straight end joint of the inner pipe is a full pressure pipe, and the open side joint of the outer pipe is a static pressure pipe. The direction of the pointing rod is the same as that of the probe head, and the direction can be determined during use, so that the probe is aligned with the incoming flow direction. The S-type pitot tube is made of two pipes with the same diameter facing the back. The windward side is the full pressure end, and the leeward side is the static pressure end. Pitot tube usage: 1. To correctly select the measuring point section, make sure that the measuring point is in a straight pipe section with smooth airflow. For this reason, the local components such as elbows, valves, and variable-diameter special-shaped pipes that measure the direction of the outgoing flow of the cross-section should be larger than 4 times the diameter of the pipe. The local elbow and reducing structure from the downstream direction should be larger than 2 times the diameter of the pipe. 2. The selection principle of the diameter specification of the pitot tube is the ratio of the diameter of the pipe under test, which is not greater than 0.02. In order to avoid interference and increase the error. Do not allow the pitot tube to be close to the tube wall when measuring. 3. When measuring, the full pressure hole should be aligned with the direction of the airflow, as indicated by the pointing rod. Air leakage should be avoided at the insertion hole of the measuring point to prevent airflow interference on the section. According to the technical specifications of pipeline measurement, the measurement points of the measurement section should be reasonably selected. 4. The pitot tube can only measure the flow velocity at a certain point on the pipe section, but the average flow velocity is used when calculating the flow rate. Since the flow distribution of the section is not uniform, more points should be measured on the section to obtain the average value. The measuring point shall be in accordance with the provisions of the flue (pipe) measurement method,“log-linear”It can also be divided according to the commonly used equal division area. 5. The S-type pitot tube static pressure joint is marked with a mark number, and the pitot tube coefficient is indicated on the identification sheet. The identification form should be kept for a long time for calculation. Pitot tube maintenance 1. The tube may bend during use. Check it once before use, pre-straighten for obvious deflection, and can no longer use if the cone is damaged. 2. After use in dusty pipes, there may be dust or moisture in the pipes. The rear container should be blown out by blowing air after use. Or test for patency before use. Clean the inner and outer tubes in time after use to ensure long-term good condition. 3. The small static pressure holes should be checked frequently, and the small holes should not be blocked by impurities, causing the pressure to be blocked. 4. The standard pitot tube verification cycle is five years. 7. Implementation standard: National Metrology Standard No. JJG518-94. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 《How to use Pitot tube》

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