1. In order to ensure that the elastic element of the pressure gauge can work reliably within the safe range of elastic deformation, the selection of the pressure gauge range should not only be based on the magnitude of the measured pressure, but also the speed of the measured pressure change. There is plenty of room. When using a pressure gauge to measure stable pressure, the maximum working pressure should not exceed 2/3 of the range;
2. Use a pressure gauge to measure the pulsation pressure. The maximum working pressure should not exceed 1/2 of the range;
3. When using a pressure gauge to measure high pressure, the maximum working pressure should not exceed 3/5 of the range. In order to ensure measurement accuracy, the minimum working pressure should not be less than 1/3 of the range. According to this principle, after calculating a value based on the measured maximum pressure, a measurement range slightly larger than the value is selected from the pressure gauge product catalog.
4. It should be selected according to the working pressure of the boiler. The limit value of the measuring range should be 1.5 to 3.0 times of the working pressure, preferably 2 times. In industrial boilers, the actual situation is that the working pressure of the boiler is always lower than the rated pressure on the nameplate, both industrial steam boilers and hot water heating boilers. For example, a 4t/h steam boiler with a rated pressure of 1 MPa, if the manufacturer is equipped with a pressure gauge 1.5 times, should be equipped with a 1.6 MPa range pressure gauge. If the user needs the production process, the actual operation can meet the process requirements under the pressure of 0.5MPa. At this time, the running range, the pointer of the pressure gauge refers to the position less than one third of the range, and the angle of the pointer is very high. small. That is, the selected pressure gauge has a too large range.
The same is true for hot water boilers. For example, the rated pressure of heating boilers is 0.7 MPa, and the pressure gauge should be 1 MPa or 1.6 MPa. If equipped with a pressure gauge of 1 MPa, it is afraid to overload the pressure gauge during the hydraulic pressure test, so the range is 1.6MPa pressure gauge. In actual operation, as long as 0.2MPa can meet the heating requirements, the pointer of the pressure gauge refers to one-eighth of the range, which makes it difficult to believe the accuracy and sensitivity of the pressure gauge.
5. In order to solve the above problems, two kinds of pressure gauges should be used, that is, when the hydraulic pressure test is used, a pressure gauge equipped by the boiler factory according to the rated pressure is used;
6. Equipped with a pressure gauge at 2 times the actual working pressure during daily operation. If the working pressure is 0.2MPa, it is equipped with a pressure gauge of 0.4MPa range. This way the pointer is in the middle of the dial and is vertically up. The seat valve pressure of the safety valve is also adjusted according to the working pressure, and the pressure gauge still has sufficient margin to cope with the overpressure indication.
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