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Deformation of orifice plate flowmeter and its solution
First, the reasons for the deformation of the orifice plate
Orifice plate deformation is due to thermal expansion, the gap between the outer diameter of the orifice plate and the annulus disappears, the orifice plate can not expand to the outer diameter direction when it continues to expand, so under the effect of differential pressure on both sides of the orifice plate, produce exit side convex Out of the deformation. When investigating the site where the plate is deformed, related clues are often found.
1. It is related to poor thermal insulation at throttling devices. The well-kept throttling device showed no leakage.
2. It is related to the weather. The throttling device originally had no leakage phenomenon. Due to the cold weather, the northwest wind blows vigorously, causing leakage at the junction between the positive and negative ring chambers.
3. It is related to leakage at the junction of the positive and negative ring chambers. It was impossible to eliminate the leakage by tightening the bolts, so the throttling device was removed and the gasket was replaced, and then the orifice plate was found to be deformed.
Correlating these related clues can lead to inferential analysis of the cause of the orifice plate deformation. When the throttling device is designed and calculated, the gap between the outer diameter of the orifice plate and the annulus is left large enough, assuming that the temperature of the orifice plate and the annulus is the same, but it is virtually impossible to be the same. The orifice plate is surrounded by the ring chamber and there is a high temperature. The fluid provides heat, so the temperature is high and it is fully expanded. The ring interior is in contact with the fluid, but the outer circle is in contact with the atmosphere, and the external environment temperature and other factors, so that the temperature drops very low, resulting in insufficient reserved clearance, causing the hole plate deformation.
Orifice plate deformation is associated with leakage at the positive and negative ring chambers, if it is not due to damage to the gasket, it is because the gap between the positive and negative ring chambers is increased after the hole plate is deformed, and the gasket appears between the ring gasket and the ring chamber. Gap.
Second, the hole plate deformation solution
After finding the root cause of the deformation of the orifice plate, there is a simple and effective method for preventing the deformation of the orifice plate. That is, when designing and calculating, considering the fact that the temperature of the annular chamber may be much lower than that of the orifice plate, the gap is reasonably calculated. The temperature in the outdoor circle of the ring should not exceed 100°C. For an orifice plate that has been deformed and failed to pass the inspection, it can only be scrapped.