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Measurement arrangement of EmulsionSENS and the resulting density profile
The SENSseries LB 480 density detectors used to measure density in the EmulsionSENS soltuion are available with a SIL 2 certificate. SIL 3 can achieved with redundant installation of two LB 480 detectors at each location. Berthold is the first manufacturer of SIL certified, radiometric low level, high level, continuous level, and density measurement systems. With these certified detectors, safe operation of critical processes is guaranteed.
Especially in low radiation conditions, our highly sensitive detectors improve the signal to noise ratio, what is resulting in superior measurement performance compared to competing systems. Source replacement is costly, time consuming, and does not work towards a reduction in overall site source activity.
Offering features such as 304 or 316 L housing materials and SIL 2/3 certification, the highly sensitive LB 480 detectors are the ideal density meters for this measurement setup. The number of detectors used depends on the measuring range and the desired resolution. For the correct positioning of the detectors on the vessel outer wall, a robust, tailor-made mounting structure is used. Due to this arrangement, the detectors and the electronics are easily accessible for assembly and are also unaffected by the process temperatures in the vessel itself. The local density values of the individual detectors can be transferred to the customer control system via a 4 ... 20 mA HART signal.
A dip tube is inserted inside the vessel to position the sources and prevent them contacting the vessel's contents. In order to ensure an almost identical distance between the dip tube or the source and the container inner wall over the entire measuring range, the geometry of the dip tube depends on the vessel orientation: For vertical vessels, a straight dip tube is used and for horizontally positioned vessels, a curved tube is used. Each dip tube is custom designed and is available in different materials.
The radiation sources are encapsulated gamma sources (Cs-137), which are installed in flexible rods. The number of sources or flexible rods is determined by the measuring range or the desired measuring arrangement.
Our sources are individually designed by our project engineers for each application, to minimize activity and doserate and optimize accuracy.
Berthold supplies a flange mounted shield into which the sources and flexible rods can be withdrawn and locked out for transport, storage, and to ensure the safety of workers needing to access the vessel. The height of the shields are minimized by using multiple flexible rods, but the shield effectiveness is maintained to minimize doserate.
For more information about Berthold shields, please follow the link below.
If the level of the individual phases is required, the LB 480 density outputs are connected to an LB 478 transmitter and the sources and detectors are staggered vertically. Using the density outputs, the heights of the density detectors, and algorithms, this LB 478 unit determines the exact position of the individual layers and outputs level values as 4..20 mA HART signals. Monitoring both densities and phase levels ensures redundant signal transmission. The transmitters in the control cabinet also provide a display of the phase levels.
This paper describes the different technologies for multiphase level measurement and their potential drawbacks, including the different nuclear density profile systems. This paper shows how Berthold with its highly sophisticated radiometric multiphase level measurement system EmulsionSENS helps refiners to optimize the separation process, minimize the probability of failure, increase efficiency, save chemicals, and reduce operating costs.
English | PDF | 1.8 MBDownload now
English | PDF | 1.8 MBDownload now