On-site guidance on maintenance strategies for pressure transmitters on oil pipelines

The oil pipeline is composed of oil pipes and their accessories, and is equipped with corresponding oil pump units according to the needs of the technological process. Due to the particularity of the oil pipeline, the maintenance of the pressure transmitter installed above requires certain skills. How to balance the relationship between the two during maintenance, not only to ensure the safety of the oil pipeline, but also to ensure that the pressure changes The normal maintenance of the transmitter is not affected. Below, the old workers on the first-line oil pipeline are invited to guide the maintenance strategy of the pressure transmitter on the oil pipeline. Maintenance is to ensure the normal operation of the pressure transmitter and is not affected by other equipment. The following regular verification and regular maintenance are indispensable. Regular verification To do a good job in the maintenance of the pressure transmitter, the first task is to carry out the regular verification of the pressure transmitter. 1. The verification environmental conditions of the pressure transmitter To do a regular verification of the pressure transmitter, it is necessary to ensure that the verification environmental conditions meet the actual requirements. Under normal circumstances, the ambient temperature when the pressure transmitter is verified is 20°C ± 5°C, the temperature change within a certain period of time cannot exceed 1°C, and the relative humidity should be controlled within the range of 45% to 75%; in addition, the influence of mechanical vibration The factor that the output of the pressure transmitter is stable cannot appear in the verification environment; not only that, the power supply voltage change of the DC-powered pressure transmitter does not exceed ±1‰ of the rated value. 2. Verification of pressure transmitters and equipment The verification of pressure transmitters requires the support of corresponding verification instruments and equipment to complete. Here, we need to first understand the concept of U95. The so-called U95 means that the confidence level of the expanded uncertainty is 95%. For the complete set of standards used to verify the pressure transmitter, 1/4 of the absolute value of the allowable error is the maximum allowable value of the expanded uncertainty U95 of the pressure transmitter under test; for pressure transmitters with a level of 0.1 and 0.05 , 1/3 of the absolute value of the allowable error is the maximum allowable value of the expanded uncertainty U95 of the pressure transmitter under test. 3. The verification steps of the pressure transmitter First, close the valve to block the gas from the pressure pipe to the transmitter; then unscrew the pressure pipe screw with an explosion-proof adjustable wrench, and connect the unscrewed pressure pipe with the pressure. The meter and the pressure pump are connected to form a gas circuit; in the case of ensuring that the calibration circuit is in good condition, check and confirm that there is no error before powering on; then, divide the pressure transmitter measurement range into 5 equal parts, and once on the basis of the minimum value of the transmitter Add the average value of 1-4 copies to obtain five standard values; then, use the pressure pump to increase the pressure, and read the measured value of the pressure signal at each point on the pressure gauge; finally, in the pressure transmitter measuring range of 105 The value of % is maintained for 2 minutes, and then the pressure is gradually reduced until the minimum value of the measurement range of the pressure transmitter, and the measured value corresponding to each standard point is read. Judging whether the pressure transmitter can correctly display the pressure value on site is realized by calculating whether its basic error is within the specified allowable error range. After the regular verification of the pressure transmitter is done in the daily maintenance, under normal circumstances, the pressure transmitter can operate normally on the SCADA system of the oil pipeline. The daily maintenance of the pressure transmitter can make the pressure transmitter run longer, more efficiently and more reliably. In order to do a good job in the daily maintenance of the pressure transmitter of the oil pipeline, it is necessary to check whether the indicated value of the instrument is abnormal and whether the indicated value is within the specified range every week; every month, check the connection between the instrument and the process interface, the pressure guiding pipe and each valve Whether there is leakage or corrosion, check the thermal insulation and heat tracing of the instrument to prevent the isolation liquid from freezing, condensing and vaporizing; every six months, check the accuracy of the zero point and displayed value of the instrument to ensure that the zero point and displayed value of the transmitter are accurate and true. In addition, the transmitter should be regularly drained, condensed or vented; the pressure guiding pipe of the easily blocked medium should be regularly purged; when the transmitter is running, its shell must be well grounded. The transmitter used to protect the system should have measures to prevent power failure, short circuit or output open circuit. It is concluded that the working condition of the pressure transmitter is good, which is an important condition to ensure the safety of oil production. The good working condition of the pressure transmitter of the oil pipeline is realized by the regular verification of the pressure transmitter, the daily maintenance of the pressure transmitter and the timely treatment of the pressure transmitter failure. Therefore, this paper puts forward the maintenance method of the pressure transmitter of the oil pipeline based on the actual situation, hoping to bring reference to the relevant staff.
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