Presentation on theme: "Non-Contact Continuous Level Measurement on MC Pump Standpipes"— Presentation transcript:
1 Non-Contact Continuous Level Measurement on MC Pump Standpipes
2 Who is Berthold?Berthold has been a world leader in radiation measurements since 1946Berthold is headquartered in Bad Wildbad, GermanyBerthold Technologies U.S.A. office is in Oak Ridge, TN
3 STANDPIPE BEFORE INSTALLATION OF BERTHOLD LEVEL SYSTEM
4 Multi-Stand Pipe Level Installation Rod Source in Yellow
5 Typical MC Stand Pipe Application Parameters Sourceh100 % 0%DetectorMC STAND PIPE;Diameter is approx 36”Wall thickness is 3/16”Measurement span is about 9’Level span begins 36”s above the center line of the MC Pump
10 Basics of the Level Measurement The source on one side of the MC Stand Pipe and a detector is on the opposite side;The pulp stock absorbs radiation as the level in the Stand Pipe changes;The level is measured by changes in the detector radiation when the pulp stock level changes;
11 Competition from Non-Radiation Level Techniques DP Cells do not measure pressure when the consistency increases because of the nature of this highly viscous productCapacitance level insertion probes are stressed extensively as the consistency increases leading to mechanical failuresMaterial bridging will also make these contacting level techniques worthlist
12 Advantages of Non Contacting Measurement Mounted completely outside the vessel and so not subject to material buildup, vibration;Detects changing levels without contacting the process material.Is safe, easy to install & calibrate, and requires very little maintenance.
13 Why Select Non Contacting Level Above 10% to 12% consistency the product acts more & more like a solidThe results of the irregular inlet flow and the MC Pumping leads to a highly turbulent , sometimes violent Stand PipeSimple calibration & 100% uptime optimizes the bleach plant output
14 Competition from other Radiation Gauging Companies Use a series of three point sources shooting radiation beams leading to a non-linear level systemLong 9 or 10 foot detector is very difficult to stabilize leading to frequent re-calibrations
15 The Berthold Maintenance Free Gauge With the Berthold System;The source is linearized;Low activity is required, (typ 1-2mCi)Two Point Calibration;Empty and Full & your throughSourceh100 % 0%Detector
16 How is the Berthold Level Gauge used to Control Level? Level system controls the Discharge Valve Position via DCSLevel system initiates the water dilution valves when level is too lowLevel system initiates the water dilution valves when level is too high
17 The Berthold Source Shielding Rod Source ShieldingsCo-60 rod sourceModel PB80Model PB200
18 The Berthold Scintillation Detector Detector -- Scintillation CounterRadiationPhotoCathodeDynodesPulseAmplifier+-Light flash
19 Advantages of Scintillation Type Detector High Sensitivity: Leading to very small radiation source sizes.Stable Operation: Drift free operation resulting in one permanent calibration.Digital Output: Gamma rays are converted to electrical pulses.
20 MC Stand Pipe Level System 20040060080010000.030.040.050.070.090.110.140.170.220.270.24Co-60 Activity distributionmm9 foot SpanControlat 45%to 55%ProtectMCPump5.0mrem/h1.0mrem/h
21 Typical Activity / Doserate for Stand Pipe Application Radiation Source Activity: Intensity of gamma radiation, measured in millicuries (activity is only 1.5 millicuries for Stand Pipe)Doserate: The measurement of the gamma radiation field, measured in millirem per hour (less than 3.0 mrem per hour for Stand Pipe)
24 Other Berthold Applications in a Pulp Mill Green Liquor DensityBlack Liquor DensityDigestor LevelSalt Cake DensityWood Chip MoistureWood Chip Belt ScaleLime Mud Density
25 Licensing Options in the USA GENERAL LICENSE: Due to the very small radiation source size, Berthold can distribute without the need of a State or NRC license.SPECIFIC LICENSE: Customers may chose this method of licensing if desired.
26 Local Berthold Technologies Contacts: Knowledgeable, experienced local Sales & service Representatives are available to assist you in all U.S. states and CanadaContact our U.S. headquarters in Oak Ridge, TN at (865) for the representative in your area.
27 In Conclusion:On a standpipe where quick level measurement response time is essential;where a reliable non-contacting measurement is needed;where simple empty and full calibration is possible without product In the Pipe Stand;Berthold level gauges are the Best Choice!!!
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