Vega Details Pressure Monitoring Of A Rupture Disc

Vega Controls has detailed an application that looks at the pressure monitoring of a rupture disc, the detection of leaks and how to prevent fissuring of the rupture disc. In the chemical and petrochemical industries, in particular on classified Seveso II plants, safety is the highest priority for engineers. The vessels, tanks and reactors are normally equipped with protection devices consisting of safety valves with rupture discs to avoid damage due to high- and low-pressure shocks. The condition of the rupture disc is often monitored with glycerin manometers installed between the safety valve and the disc.

However, there are issues that this device is not able to transmit its measuring information and they are often not SIL qualified. They often have limited resolution in low-pressure ranges, which does not allow for a very precise set point. The implementation of a Smart pressure sensor with a ceramic cell allows it to measure very small pressure variations and so detect the slightest leak and prevent fissuring of the rupture disc. It is rugged enough to cope with any over-pressure, should it occur. The pressure applied minutely deflects a sensitive diaphragm (this can be as little as 10 microns) yet this also has to be highly stable with pressure and temperature shocks.

This small deflection is measured by a special electronic circuit and then converted to an output signal. Vega Controls said there are several benefits of using microwave barriers in this type of application, including: sensor with a dry ceramic cell offering a high resolution for very low measuring ranges; high measurement stability; local display and electrical measuring signal in analogical or digital standard (FF/Profi); Atex G and D approval; and SIL 2 qualified according to IEC 61508.


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