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News Release from: Emerson Process Management | Subject: Magnetic and coriolis flow
Edited by the Processingtalk Editorial
Team on 30 December 2002
Sugar processor finds Hart advantages.
Instrumentation from Emerson Process Management has helped British Sugar improve sugar liquor processing, using Hart interfacing and Coriolis density measurement.
British Sugar is sweet on Emerson Instrumentation from Emerson Process Management has helped British Sugar improve sugar liquor processing Instrumentation from Emerson Process Management has helped British Sugar improve sugar liquor processing
This article was originally published on Processingtalk on 15 Oct 2008 at 8.00am (UK)
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Hart tagging and setup of new Rosemount flow transmitters allowed quick and simple commissioning, using only one technician: fast delivery of Micro Motion systems led to Coriolis meter adoption for sugar density measurement, bringing project back on target.
British Sugar, the sole processor of the UK sugar beet crop, has six UK factories, and produces around 1.3M tonnes of sugar per year.
The Wissington, Norfolk plant is the largest sugar beet processing factory in Europe, with the purification stages handling over 750 tonne of juice every hour.
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While the beet is harvested and delivered for processing between October and February, after initial extraction and purification the thick juices resulting from initial evaporation stages can be stored for later processing: the plant works 24 hours a day nearly all year-round.
Typically, the thick juices contain up to 65% sugar, which are repeatedly passed through filters for purification, and are then sent for evaporation in vacuum pans, seeded to produce sugar crystals.
The efficiency of these processes is dependent on that year's crop quality, and the proportions of recirculated liquors, so that processing needs accurate monitoring and control, plus the benefit of experience.
Critical to the plant performance is flow measurement of the liquors being processed and drawn off, and Rosemount 8732C magnetic flow transmitters were chosen for this duty.
Main criteria for choosing this technique was that it is totally obstructionless, with no pressure drop, so the separation process is unaffected.
In all, 56 Rosemount units were installed, on line sizes between 50 and 150mm, pre-programmed using the site original Hart handheld interface unit in the workshop, to the correct tag number and full scale flow rate.
Once installed on site, the tag number allowed control room identification of the correct cable pair for connection to the control system, the whole exercise being achieved by a single technician.
The wide rangeability of the Rosemount flowmeters, and a pricing agreement with Emerson for the complete quantity required on plant, in phases as the process design was finalised, confirmed the choice.
These density measurements are critical to controlling the efficient operation of the plant, and it was discovered on start-up of these new systems that the density sensor installed could not monitor these liquors, and fast action was needed to complete commissioning.
A Micro Motion Coriolis meter had been installed in the site boiler house some years before, so was repositioned to monitor its performance on the process liquor line.
This old unit measured the liquor density with no problem, so five further units were ordered to get the plant going, for delivery within a week.
Fast delivery of these brought the project back on track.
Further Micro Motion Coriolis units from Emerson were delivered for liquor density measurement across the plant, and the whole project was completed within budgeted costs and timescale.
British Sugar Instrumentation Manager John Fleming commented: "I was particularly impressed at the ease of commissioning these new units using the handheld interface, which is still compatible with the older Rosemount and Micro Motion equipment across the site.
This programming unit is also used on the Rosemount DP cells monitoring the liquor levels in the vacuum evaporators, and pressure transmitters on the process tanks.
Our next step will be to establish maintenance and calibration records on the AMS software installed on our control system, using the same Hart communications". Request a free brochure from Emerson Process Management ...
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