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Several factors causing deformation of orifice flowmeter

Author:    Source:    Date: 2021-06-01 14:53:59
The orifice flowmeter is often deformed in the use of the shell, and the meter cannot measure accurately. The deformed orifice is mostly a throttle flowmeter with a larger diameter, which is a throttle device that measures the temperature of the medium, such as superheated steam, and the annular cavity pressure with a relatively thin thickness of the orifice.
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   When we process orifice plates and annular cavities, the temperature is very low, usually at room temperature, but in actual use, the temperature is very high, so their geometric dimensions have undergone significant changes. The material of the annular chamber is generally carbon steel, so the coefficient of linear expansion is usually 1110-6-1, and the material of the orifice plate is 304 stainless steel, the coefficient of linear expansion is usually 1610-6-1, so the difference in expansion coefficient is 510-6 -1 After the throttling device is used, when it comes into contact with high-temperature fluid, the orifice and the annulus expand correspondingly. The increase in the expansion of the outer diameter of the orifice is greater than the increase in the expansion of the inner diameter of the corresponding part of the annulus, so the throttling is manufactured When opening, make sure that there is sufficient expansion clearance between the orifice and the annulus

  Who caused the deformation of the orifice flowmeter? Today, the staff of Mingyu automatic control equipment found clues related to it after on-site investigation and on-site research and analysis. One thing is certain is that the reason why the orifice plate is deformed is that after thermal expansion, there is no gap between the outer diameter of the orifice plate and the annular chamber. If the orifice plate continues to expand, it cannot expand in the outer diameter direction, so the outlet side Will be deformed by the differential pressure on both sides of the orifice plate

   The first one has to do with weather. The throttling device originally did not leak. The weather was hot and cold, and the northwest wind was blowing very hard, causing leakage at the junction of the positive and negative ring chambers.

   is again related to the poor insulation of the throttling device. The well-insulated throttling device does not leak.

   The third is related to the leakage of the junction between the positive and negative annulus. Since the method of tightening the bolts could not eliminate the leakage, when the throttle valve was removed and the gasket was replaced, the deformation of the orifice was found.

   In the design calculation of the throttling device, the outer diameter of the orifice plate and the joint gap of the annular chamber are large enough to assume that the temperature of the orifice plate and the annular chamber are the same, but in fact they are not the same. The orifice plate is surrounded by the annular chamber. In addition, because the high-temperature fluid provides heat, the temperature is very high and the expansion is sufficient. On the other hand, the circle inside the torus is in contact with the fluid, but the outer circle is in contact with the atmosphere. With the addition of factors such as "bad heat preservation", "cold", and "big northwest wind", the temperature is reduced and the gap is ensured. Insufficient, orifice

   In addition, the deformation of the orifice plate is related to the leakage of the positive and negative ring chambers. It is not the leakage of the gasket that is damaged, but the deformation of the orifice plate causes the gap between the positive and negative ring chambers to become larger, resulting in gap leakage between the gasket and the ring chamber.

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