【Q&A Question 112】2016.08.10
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【Q&A Question 112】August 10, 2016: The pressure gauge at the outlet of the circulation pump was faulty. Describe the steps for calibrating the gauge, as well as the possible issues that may arise. The answer key will be available after responding; scoring is based on answering the key points. Internal operation ； Contact to switch the anti-surge valve to manual mode, then perform forced manual operation before calibrating the gauge. Calibration should be carried out promptly, and monitoring of the circulation pump should be intensified during the calibration period. If no communication is made with the operator, force the calibration of the gauge. This will cause the pressure at the outlet of the recycled hydrogen to drop to zero instantly, the anti-surge valve to open immediately, the system pressure to rise sharply, the temperature at the outlet of the heater to increase, the amount of recycled hydrogen to decrease, the reactor temperature to rise, and the anti-surge valves on the DCS and SIS interfaces to turn green, among other things~~~~~
Contact the instrument, issue a work order, and calibrate the instrument. The surge valve may open fully, resulting in an increased amount of hydrogen mixed into the reactor and causing a spike in temperature.
Prepare the tools and wear appropriate protective equipment. First, close the hand valve on the pressure gauge, remove it, and calibrate it; there is a risk of poisoning or suffocation
1. Contact to fill out the work order； 2. The guardian should arrive at the scene and get ready ； 3. Close the manual valves before and after anti-surge protection ； 4. Calibrate the meter ； 5. After proofreading, confirm and restore to the original state
The remote pressure gauge reading is high; the anti-surge control valve opens
First, close the root valve that measures the pressure. Then correction is performed. A possible problem is that the valve does not close properly, resulting in leakage of recycled hydrogen.
First, remove the pressure gauge, calibrate it using a standard pressure gauge, attach a certificate of conformity once calibration is complete, and then reinstall it. If issues arise during calibration, they can often be repaired and the gauge can be used again; otherwise, if it’s too damaged to be repaired, it must be replaced with a new one.
If either the on-site gauge or the remote-transmitted gauge is inaccurate, the system pressure and the accurate one of these gauges can be used as a reference. Proper safety measures must be in place when discharging the medium