Correct installation method of steam flowmeter and its installation precautions

Recently, many users have raised many questions about the installation steps and methods of the steam flow meter . Today, the meter has analyzed the detailed installation steps and precautions for everyone. I hope that everyone can have a clearer understanding of the installation of the steam flow meter. Help, and I wish you all the best in the Year of the Pig in 2019!

The correct installation method and precautions for the steam flow meter:

1. Problems in the selection of steam flow meters. Some vortex sensors are selected on the caliber selection or after the design selection, due to the change of process conditions, so that the selection is larger, the actual selection should be as small as possible to improve the measurement accuracy. The main reason for this is the same. Questions 1, 3, and 6 are related. For example, a vortex pipeline is designed for use by several equipment. Because some of the equipment is not used, the actual actual flow is reduced. The actual design results in too large an original design, which is equivalent to an increase in measurable flow. The lower limit, when the process pipe is small, the indication cannot be guaranteed. When the flow is large, it can be used, because it is sometimes too difficult to re-engineer. The change of the process conditions is only temporary. The re-tuning of the parameters can be combined to improve the indication accuracy.

2. Problems with the installation of steam flow meters. The main reason is that the length of the straight pipe in front of the sensor is not enough, which affects the measurement accuracy. The reason for this is mainly related to the problem 1. For example, the straight pipe section in front of the flow sensor is obviously insufficient. Since the FIC203 is not used for measurement, it is only used for control, so the current accuracy can be used equivalent to the downgrade.

3. Reasons for parameter setting direction. Due to the parameter error, the instrument indication is incorrect. The parameter error makes the secondary instrument full-scale frequency calculation error. The reason for this is mainly related to questions 1 and 3. The full-scale frequency is similar, indicating that the long-term inaccuracy is indicated. The full-scale frequency of the actual full-scale frequency and large-dry calculation indicates that the range is fluctuating and cannot be read. The inconsistency of the parameters on the data affects the final determination of the parameters, and finally passes. Recalibration combined with mutual comparison to determine the parameters solves this problem.

4. The secondary instrument is faulty. There are many faults in this part, including: when the instrument board is disconnected, the range setting has individual bit display bad, and the K coefficient setting has individual bit display bad, which makes it impossible to determine the range setting and K factor setting. Part of the reason is mainly related to questions 1, 2. The problem is solved by fixing the corresponding fault.

5, four-way line connection problem. On the surface of some circuits, the line connection is very good. Check carefully. Some connectors are actually loose and the circuit is interrupted. Some connectors are tightly connected, but the fastening screws are fastened to the wire due to the secondary line problem. Interruption, this part of the reason is mainly related to question 2. Solved the corresponding line problem, and the existing problems are solved accordingly.

6. The connection problem between the secondary instrument of the steam flowmeter and the subsequent instrument. Due to the problem of the subsequent instrument or the maintenance of the subsequent instrument, the mA output circuit of the secondary instrument is interrupted. For this type of secondary instrument, this part is mainly related to the problem 2. Especially for the subsequent recorders, in the case that the recorder cannot be repaired for a long time, it is necessary to pay attention to shorting the output of the secondary meter.

7. The circuit always has no indication due to the failure of the secondary instrument flat-axle cable. Due to long-term operation, coupled with the influence of dust, the flat-axle cable is faulty, and the problem can be solved by cleaning or replacing the flat-axis cable.

8. For the problem 7, the main problem is that the secondary instrument shows that the fixing screw of the meter head is loose, causing the head to sink, the pointer and the case friction are large, the movement is not working, and the problem is solved by adjusting the meter head and re-fixing.

9, the flowmeter uses environmental issues. In particular, the sensor part installed in the well is affected by the humidity of the environment, which causes the circuit board to be damp. This part is mainly related to questions 2 and 2. Through the corresponding technical improvement measures, the sensor part with large humidity is re-separated from the probe part and the conversion part, and the separate type sensor is used. Therefore, the working environment is good, and the instrument has been running well.

10. Due to the poor adjustment of the site, or due to the actual situation after the adjustment. Due to the on-site vibration and noise balance adjustment and sensitivity adjustment is not good, or because of the re-change of the situation after a period of operation after the adjustment, the indication problem is caused, which is mainly related to questions 4 and 5. Use an oscilloscope, plus the combined process operation, and re-adjust.

11. The reason why question 8 is raised separately is that this problem has affected the analysis and resolution of the problem for a long time. Since the Dongfang chemical plant does not have the K-factor calibration condition, the K-factor can only be based on the information provided by the manufacturer, due to the manufacturer’s own Some changes have caused the K factor on several pieces of information provided, which has affected the problem solving.