What is the elastic aftereffect of stainless steel shock-resistant meter?

1. Inelastic effect and elastic aftereffect of elastic elements of stainless steel seismic table. It means that when the pressure exerted on the elastic element is cancelled, the original shape and size cannot be restored immediately, but it takes a certain time for the elastic element to return to its original shape and size. This phenomenon is called elastic aftereffect.

2. Proportional pole/limit and elastic pole/limit of stainless steel seismic table. The following is an example of low carbon steel and stress-strain characteristic curve. When the relative deformation in the material increases in direct proportion to the stress, the great stress is called proportional pole/limit. Elastic pole/limit, under a certain stress, the residual deformation in the material has reached a predetermined small value, then this stress is called elastic pole/limit and expressed by elasticity.

3. The elastic deformation of the elastic element of the stainless steel seismic table, the geometric shape and size of the elastic sensitive element will change under the action of pressure. Within the elastic limit, the change is directly proportional to the pressure. When the pressure is cancelled, the element can return to its original size and shape. This phenomenon is called elastic deformation.

Calibration and installation knowledge of pressure gauge

The so-called calibration is to apply the same pressure to the calibrated pressure gauge and the standard pressure gauge and compare their indicated values. The absolute/alignment error of the selected standard meter should generally be less than 1/3 of the absolute/alignment error of the calibrated instrument, so its error can be ignored, and it is considered that the reading of the standard meter is the value of the real pressure gauge. If the reading error of the calibrated instrument for the standard instrument is not greater than the specified error of the calibrated instrument, it is considered that the calibrated instrument is qualified.

Installation of shock-resistant pressure gauge:

1. Selection of pressure measuring points. The selected pressure measuring points can reflect the real situation of the measured pressure.

(1) Choose the pipe section where the measured medium flows in a straight line, and don't choose the pipe bend, bifurcation, dead corner or other places where vortex is easy to form.

(2) When measuring the pressure of the flowing medium, the pressure point should be perpendicular to the flowing direction to remove the burr.

(3) When measuring liquid pressure, the pressure taking point should be at the lower part of the pipeline, so that gas does not accumulate in the pressure guide pipe; when measuring gas, the pressure taking point should be above the pipeline, so that liquid does not accumulate in the pressure guide pipe.

2, guide pipe laying

(1) The pressure guide pipe is of appropriate thickness, generally with an inner diameter of 6 ~ 10 mm and a length of 3 ~ 5 m..

(2) When the measured medium is easy to condense or freeze, heat preservation and heat tracing pipelines should be added.

(3) Cut-off valve should be installed between the pressure tap and the pressure gauge, and it should be close to the pressure tap.

3, the installation of stainless steel pressure gauge

(1) The pressure gauge shall be installed in a place where it is easy to observe and repair.

(2) The installation site should try to avoid the influence of vibration and high temperature.

(3) When measuring steam pressure, a condensate pipe should be installed to prevent high-temperature steam from directly contacting the pressure measuring element; When there is corrosive medium, an isolation tank filled with neutral medium should be installed. In short, according to specific conditions (such as high temperature, low temperature, corrosion, crystallization, precipitation, viscous medium, etc.), take corresponding protective measures.

Sealing gasket should be installed at the joint of pressure gauge, generally asbestos cardboard or aluminum sheet should be used for pressure below 80℃ and 2MPa, and annealed copper or lead pad should be used for higher temperature and pressure (50MPa). In addition, the influence of medium should be considered. For example, the pressure gauge for measuring oxygen cannot use gaskets with oil or organic compounds, otherwise it will cause an explosion. It is forbidden to use copper pad when measuring acetylene pressure.

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