Installation and maintenance skills of gas flow meters

Gas flow meter is a commonly used flow measuring instrument, which has the advantages of flexible use, stable performance, high reliability and easy installation. It is widely used in steel plants, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection, etc. In the industry, the measurement is mainly for coal gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen, etc. Let's introduce the key points and requirements of the gas flowmeter installation, hoping to help users better apply the product. Installation key points of gas flowmeter 1. Liquefied gas flowmeter is a velocity flowmeter. The stability of vortex separation is affected by the flow rate, so it has certain requirements for straight pipe sections, generally the first 10D and the last 5D; 2. Measuring liquid When measuring gas, the upper limit flow rate is limited by pressure loss and cavitation phenomenon, generally 0.5-8m/s; 3. When measuring gas, the upper limit flow rate is limited by the change in the compressibility of the medium, and the lower limit flow rate is limited by the Reynolds number and sensor sensitivity. Steam is 8～25m/s; Gas flow meter installation requirements 1. Length of front and rear straight pipes. Ensure that the inlet straight pipeline ≥ 20 × DN; the outlet straight pipeline ≥ 5 × DN. 2. The inner diameter of the upstream and downstream piping should be the same. If there is a difference, the inner diameter of the piping Dp and the inner diameter Db of the vortex meter should meet the following relationship: 0.98Db≤Dp≤1.05Db The upstream and downstream piping should be concentric with the inner diameter of the flow meter, and the axial degrees between them are different It should be less than 0.05Db. 3. The gasket between the instrument and the flange should not protrude into the pipe during installation, and its inner diameter should be 1-2mm larger than the inner diameter of the meter. 4. The installation design of the pressure measuring hole and the temperature measuring hole. When temperature and pressure transmitters need to be installed on the pipeline under test, the pressure measuring hole should be set at the downstream 3-5D, and the temperature measuring hole should be set at the downstream 6-8D. D is the gauge diameter, unit: mm 5. The instrument can be installed horizontally, vertically or obliquely on the pipeline. When measuring gas, install the instrument in the vertical pipeline, and the gas flow direction is not limited. However, if the pipeline contains a small amount of liquid, in order to prevent the liquid from entering the meter measuring tube, the airflow should flow from bottom to top. 6. When measuring high-temperature and low-temperature media, attention should be paid to heat preservation measures. Gas flowmeter maintenance skills look more cumbersome, but this is a more critical step for cleaning and maintenance. The more detailed the better, so that there will be no problems with installation or maintenance after maintenance. If there is a problem, it will be more troublesome. Gas flowmeters will produce certain dirt and wear during use. Users need to maintain gas flowmeters on a regular basis. The following describes the maintenance techniques of gas flowmeters in detail. I hope it can help everyone. 1. The steps of wiping the appearance of the flowmeter: 1. Wipe the flowmeter with a dry fine cotton cloth or wiper paper to wipe off the dust, oily dust, or oily dirt. 2. You can also use a blower to blow off the dust. 3. If necessary, use a clean fine dry cotton cloth dipped in industrial alcohol or high-grade lubricating oil to wipe the friction surface. 2. Steps for wiping the mirror surface of the flowmeter: 1. First wipe the surface of the mirror gently with lens-cleaning paper, do not use force to avoid damage to the mirror surface. 2. Dip a cotton swab with industrial alcohol, gently wipe the surface of the mirror, and put it back in after the alcohol evaporates. 3. Mirror wiping can be divided into correction glass and lens group. Because dust particles will cause black spots in the image, mirror wiping is very important. After the installation, you need to observe the wiping result through the image again. 3. Flowmeter transmission part: divided into dry friction part and lubrication part. The dry friction part is divided into air bearing and toothless screw drive mechanism. Dry friction part of the maintenance steps: 1. First wipe the friction surface with a dry fine cotton cloth or wiper paper to wipe off the dust or oil. 2. You can also use a blower to blow off the dust. 3. If necessary, use a clean fine dry cotton cloth dipped in industrial alcohol or high-grade lubricating oil to wipe the friction surface. Maintenance steps for the lubrication part: 1. Wipe the dust clean with a fine cotton cloth. 2. Add lubricating oil to the lubrication part of the flow meter, or add it with a grease gun.
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