Before the chemical plant enters the scene, look at the wind, and when you look at the top of the scene, look at the six roads and listen to the eight sides.
Maintenance instruments understand the process, understand the medium, temperature and pressure.
There must be a plan for the equipment to go offline, and an emergency plan.
There is also a variety of tickets to be complete.
Labor insurance supplies are essential.
Interlocking instrument inspection must open the interlocking work ticket, the instrument technician and the process technician sign, and the parameter change must be signed by the competent department.
Inform the operator to the site, and ask the specific fault phenomenon of the instrument. According to the situation of the operator, judge whether the instrument is faulty, whether it needs to be dismantled and repaired with the process cut-off, or other conditions (such as process reasons).
What are the precautions for the instrumentation field work?
Comprehensive analysis: 1. First, the instrument manufacturer must be familiar with whether the workplace is a flammable or explosive place or a place that produces toxic and harmful media; 2. Then familiar with the work content, handle the maintenance work ticket, and two or more people participate; 3. Pay attention to the following points before and during work: (1) According to the work tasks, the safety risk analysis must be fully carried out, the harmful risk factors should be listed in detail, and corresponding safety measures should be taken to wear various corresponding protections. Supplies, such as climbing work, must be carried out in accordance with the requirements of climbing, wear non-slip shoes, fasten seat belts, windy days or rain and snow, prohibiting work, etc.; hot work requires a good work ticket, analysis and qualified After the guardian can work; when inspecting or replacing the closed container such as tower, tank, tank, reactor, etc., do the analysis or replacement work, confirm the qualified work, and hang some signs such as work; for toxic and harmful corrosive media When measuring instruments and regulating valves, it is necessary to wear protective tools such as gas masks or air breathing apparatus; (2) power failure is required. The watch must be prepared for power outages, with the interlocking or self-controlled regulating valve overhaul, notify the craftsman in advance, and create maintenance conditions, remove the interlock or set the automatic control loop to manual control; (3) Oxygen-rich zone It is forbidden to strike with a hammer or use equipment that is easy to generate sparks during maintenance; (4) Stand on the side of the instrument when disassembling the instrument, and make sure that the pressure medium is drained before it can be disassembled. If it is toxic and harmful, it must be discharged to the designated position to prevent it. Pollution. If the meter is measuring oxygen medium, it must be degreased when it is installed. (5) Take measures to prevent hot and heat from burning when handling high temperature medium meter failure, and make sure that the secondary valve is closed once. [HIDE]
When repairing the on-site instrument, the process should be notified. For example, if the valve is repaired, the process should be bypassed. The base of the valve should be removed to confirm whether the pipe is liquid or gas. Is it toxic? It is harmful to the environment. When disassembling the signal line, ask if the process has a chain, dcs There may be alarm repairs to confirm that the instrument's working parameters are normal and then leave the post record to write in detail, so that the situation that appears in the future work is very different, but the basic precautions are consistent.
1. When using the ohmmeter of the multimeter, remember not to measure with electricity.
2. When using the logic pen and oscilloscope to detect signals, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is to form a short circuit under power-on.
3. When detecting the filter capacitor in the power supply, first short-circuit the positive and negative poles of the electrolytic capacitor, and do not use the test lead wire instead of the wire to discharge the capacitor when short-circuiting, because it is easy to blow the core wire. You can take a 220v, 60~100w lamp with a lamp lead and connect it to the two ends of the capacitor. The bulb will flash when it is discharged.
4. When repairing the instrument fault in a humid environment, it is necessary to measure the smoothness of each point on the printed circuit with a multimeter, because the main fault in this case is copper foil corrosion.
5. When repairing the internal circuit of the instrument, if the contact points of the mounted components and the circuit board are coated with insulating varnish, the parameters of each point can be measured by ordinary hand stitching on the test chart of the multimeter, so as to pierce the paint layer and directly measure the points. It is not necessary to peel off the paint layer over a large area.
6. Do not plug or unplug various control boards and plugs. Because in the case of power-on, the plug-in control board will generate a strong induced electromotive force, and the instantaneous counter-attack voltage is very high, which easily damages the corresponding control board and plug.
7. Do not blindly knock and touch when you are overhauling, so as to avoid expanding the fault and repairing it worse.
8. When disassembling and adjusting the instrument, the original position should be recorded for recovery.
9. When repairing precision instruments and meters, if you accidentally fly a small part, you should first judge the place where it may fly. Do not look east, turn it over, you can use magnet scanning and line-of-sight scanning method to find.
10. Instrumentation personnel should be familiar with the performance of the instrument and the installation and use methods and maintenance techniques of various instruments.
11. In use, the instrument should be in normal operation, keep the instrument clean, record accurately, the stencil should be clear, the millivolt meter should be adjusted to room temperature, and the external resistance of the supplementary wire should be kept in use.
12. The installation of the instrument should prevent vibration, and avoid large magnetic fields and power lines to prevent interference.
13. Inspectors should wear insulated shoes and other protective equipment before troubleshooting, and should work together by two people.
14. All kinds of instruments should be regularly repaired and maintained (including one thermocouple), and can be used after being qualified.
15. If the instrument is faulty or the indication is inaccurate, the adjustment should be stopped and the installation should not be forced.
In short, in the maintenance of instrumentation, first understand the basic principles of instrumentation, and master the knowledge and skills related to electronics, and should prepare all the instrument manuals, drawings and other technical information, and should develop a kind of Good work quality, so as to improve efficiency and reduce mistakes in the maintenance work of instrumentation.
Precautions for the on-site work of the instrumentation: To inform the workshop of the process preparation, determine what media to repair the instrument and pipeline, must have a good communication in the workshop, determine that there is an accident during the maintenance process, the medium for cleaning the pipeline must Clean up. Some instrument pipelines are not bypassed. It is necessary to comprehensively consider the medium for cleaning the pipeline. It should not be blindly dried. If the purge is performed, the toxic substances or odorous gases after the purge should go to the torch, or clean the toxic liquid or smelly. Liquid de-incinerator, do not go outside the atmosphere to deal with the field instrument problems, first of all to understand whether the instrument with interlock? There is an interlock to cut the ticket to bypass, no interlock to change the corresponding circuit manually, check the regulating valve to open the secondary line first, cut off the positive line, before the disassembly valve to open the pouring, to prevent pressure, pour It is best not to dismantle (the pressure is very dangerous when the pressure is dry, especially when the medium is toxic and harmful), the upstream and downstream valves of the regulating valve are not dead or can be dismantled, and the table type is checked to ensure that the root valve can be shut down. Be careful when you work.
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