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1. The L-type pitot coefficient is between 0.99-1.01, and the S-type pitot is between 0.81-0.86.
2. The measured air flow rate does not exceed 40m/s, and the measured flow rate does not exceed 25m/s.
3. The Φ8 tube is the longest 1500mm, the Φ10 tube is the longest 2000mm, (the company has various pitot tubes)
Pitot use:
In scientific research, production, teaching, environmental protection, and tunnels, mine ventilation, and energy management departments, Pitot tubes are commonly used to measure the airflow velocity in ventilation ducts, industrial ducts, and kiln flue ducts, and the flow rate can be determined through conversion to measure the water flow in the ducts. speed. The use of Pitot tube to measure the speed and determine the flow rate has a reliable theoretical basis and is easy to use and accurate. It is a classic and extensive measurement method. In addition, it can also be used to measure the pressure of a fluid.
Pitot tube structure:
The L-type pitot tube is formed by concentric jointing of two different straight stainless steel tubes. The inner tube straight end-to-end joint is a full-pressure tube, and the outer tube-side joint is a static pressure tube. The pointing rod is in the same direction as the head of the rod. When used, the direction can be determined so that the probe is aligned with the flow direction. The S-type pitot tube is made from two branches facing away from each other. The windward side is the full-pressure side and the lee side is the static side.
Pitot use method:
1. It is necessary to select the cross section of the measuring point correctly to ensure that the measuring point smoothly flows through the straight pipe section. For this reason, the local components such as elbows, valves, and variable diameter tubes in the direction of the flow direction of the measured cross-section must be greater than 4 times the pipe diameter. The local elbow and reducing structure in the downstream direction should be greater than 2 times the pipe diameter.
2. The diameter of the pitot tube is selected in accordance with the diameter ratio of the pipe under test and is not greater than 0.02. In order to avoid interference, increase the error. Do not allow the Pitot tube to be close to the wall when measuring.
3. When measuring, the full pressure hole should be aligned with the direction of the air flow to point to the rod. The measurement point should be inserted into the hole to avoid air leakage and prevent air flow interference on the section. According to the technical specifications for pipeline surveying, the survey point of the survey section should be reasonably selected.
4. Pitot tube can only measure the flow velocity at a certain point on the pipeline section, but when calculating the flow rate, the average flow velocity should be used. Because the flow distribution of the cross section is not uniform, several points should be measured on the section to obtain the average value. Measurement points are measured by the flue (pipeline) measurement method, and are classified according to the “log-linear†method, and can also be divided according to the commonly used equally divided areas.
5. S-type pitot tube static pressure joints are marked with a marking number, and the pitot coefficient is indicated on the identification sheet. The identification sheet should be kept for a long time for calculation.
Pitot tube maintenance 1. May cause the tube to bend during use. Check once before use, noticeable deflection is pre-aligned, and cone-head damage can no longer be used.
2. After use in dusty pipes, there may be dust or moisture in the pipes. Should be blown after use, after the box is blown. Or test the smoothness before use. Clean the inner and outer tubes timely after use to ensure long-term good condition.
3. Small static pressure holes often check, do not make impurities plug the small holes, causing pressure barriers.
4. The standard pitot inspection cycle is five years.
VII. Execution standards: The national measurement standard number JJG518-94.
Pitot technology parameters: