Non-Contact Continuous Level Measurement on MC Pump Standpipes

Who is Berthold?Who is Berthold?

Berthold has been a world leader in Berthold has been a world leader in radiation measurements since 1946radiation measurements since 1946

Berthold is headquartered in Bad Berthold is headquartered in Bad Wildbad, GermanyWildbad, Germany

Berthold Technologies U.S.A. office is in Berthold Technologies U.S.A. office is in Oak Ridge, TN Oak Ridge, TN

STANDPIPE BEFORE INSTALLATION OF BERTHOLD LEVEL SYSTEM

Multi-Stand Pipe Level Installation

Rod Source in Yellow

Typical MC Stand Pipe Application Typical MC Stand Pipe Application ParametersParameters

Source

h

100 % 0%

Detector MC STAND PIPE;MC STAND PIPE;

Diameter is approx 36”Diameter is approx 36”

Wall thickness is 3/16” Wall thickness is 3/16”

Measurement span is Measurement span is

about 9’ about 9’

Level span begins 36”s Level span begins 36”s

above the center line of above the center line of

the MC Pumpthe MC Pump

Typical Radiation Detector Mounting

Basics of the Level MeasurementBasics of the Level Measurement

The source on one side of the MC Stand The source on one side of the MC Stand

Pipe and a detector is on the opposite side;Pipe and a detector is on the opposite side;

The pulp stock absorbs radiation as the The pulp stock absorbs radiation as the

level in the Stand Pipe changes;level in the Stand Pipe changes;

The level is measured by changes in the The level is measured by changes in the

detector radiation when the pulp stock level detector radiation when the pulp stock level

changes;changes;

Competition from Non-Competition from Non-Radiation Level Radiation Level TechniquesTechniques

DP Cells do not measure pressure when DP Cells do not measure pressure when the consistency increases because of the the consistency increases because of the nature of this highly viscous productnature of this highly viscous product

Capacitance level insertion probes are Capacitance level insertion probes are stressed extensively as the consistency stressed extensively as the consistency increases leading to mechanical failuresincreases leading to mechanical failures

Material bridging will also make these Material bridging will also make these contacting level techniques worthlistcontacting level techniques worthlist

Advantages of Non Contacting Advantages of Non Contacting MeasurementMeasurement

Mounted completely outside the vessel and Mounted completely outside the vessel and

so not subject to material buildup, vibration;so not subject to material buildup, vibration;

Detects changing levels Detects changing levels without contacting without contacting

the process material.the process material.

Is safe, easy to install & calibrate, and Is safe, easy to install & calibrate, and

requires very little maintenance.requires very little maintenance.

Why Select Non Contacting LevelWhy Select Non Contacting Level

Above 10% to 12% consistency the product Above 10% to 12% consistency the product

acts more & more like a solid acts more & more like a solid

The results of the irregular inlet flow and the The results of the irregular inlet flow and the

MC Pumping leads to a highly turbulent , MC Pumping leads to a highly turbulent ,

sometimes violent Stand Pipesometimes violent Stand Pipe

Simple calibration & Simple calibration & 100% uptime100% uptime optimizes optimizes

the bleach plant outputthe bleach plant output

Competition from other Competition from other Radiation Gauging Radiation Gauging CompaniesCompanies

Use a series of three point sources Use a series of three point sources shooting radiation beams leading shooting radiation beams leading to a non-linear level systemto a non-linear level system

Long 9 or 10 foot detector is very Long 9 or 10 foot detector is very difficult to stabilize leading to difficult to stabilize leading to frequent re-calibrationsfrequent re-calibrations

The Berthold Maintenance Free The Berthold Maintenance Free GaugeGauge

Source

h

100 % 0%

Detector With the Berthold System;With the Berthold System;

The source is linearized;The source is linearized;

Low activity is required, Low activity is required,

(typ 1-2mCi)(typ 1-2mCi)

Two Point Calibration; Two Point Calibration;

Empty and Full & your Empty and Full & your

throughthrough

How is the Berthold Level Gauge How is the Berthold Level Gauge used to Control Level? used to Control Level?

Level system controls the Discharge Valve Level system controls the Discharge Valve

Position via DCSPosition via DCS

Level system initiates the water dilution Level system initiates the water dilution

valves when level is too lowvalves when level is too low

Level system initiates the water dilution Level system initiates the water dilution

valves when level is too highvalves when level is too high

The Berthold Source ShieldingThe Berthold Source Shielding

Rod Source ShieldingsRod Source Shieldings

Co-60 rod source

ModelModel PB80PB80 Model PB200Model PB200

The Berthold Scintillation DetectorThe Berthold Scintillation Detector

Detector -- Scintillation CounterDetector -- Scintillation Counter

Radiation

PhotoCathode

Dynodes PulseAmplifier

+-

Light flash

Advantages of Scintillation Type Advantages of Scintillation Type DetectorDetector

High SensitivityHigh Sensitivity: Leading to very small : Leading to very small

radiation source sizes.radiation source sizes.

Stable OperationStable Operation: Drift free operation : Drift free operation

resulting in one permanent calibration.resulting in one permanent calibration.

Digital OutputDigital Output: Gamma rays are converted to : Gamma rays are converted to

electrical pulses.electrical pulses.

0

200

400

600

800

1000

0.03

0.03

0.04

0.04

0.05

0.07

0.09

0.11

0.14

0.17

0.22

0.27

0.24

Co-60 A

ctivity distrib

ution

mm

9 footSpan

Control at 45% to 55%

ProtectMCPump

5.0mrem/h

1.0mrem/h

MC Stand Pipe Level SystemMC Stand Pipe Level System

Typical Activity / Doserate for Typical Activity / Doserate for Stand Pipe ApplicationStand Pipe Application

Radiation Source Activity:Radiation Source Activity: Intensity of gamma Intensity of gamma

radiation, measured in millicuries (activity is radiation, measured in millicuries (activity is

only 1.5 millicuries for Stand Pipe)only 1.5 millicuries for Stand Pipe)

Doserate:Doserate: The measurement of the gamma The measurement of the gamma

radiation field, measured in millirem per hour radiation field, measured in millirem per hour

(less than 3.0 mrem per hour for Stand Pipe)(less than 3.0 mrem per hour for Stand Pipe)

Other Berthold Applications in a Other Berthold Applications in a Pulp MillPulp Mill

Green Liquor DensityGreen Liquor Density Black Liquor DensityBlack Liquor Density Digestor LevelDigestor Level Salt Cake DensitySalt Cake Density Wood Chip MoistureWood Chip Moisture Wood Chip Belt ScaleWood Chip Belt Scale Lime Mud DensityLime Mud Density

Licensing Options in the USALicensing Options in the USA

GENERAL LICENSE: Due to the very small GENERAL LICENSE: Due to the very small

radiation source size, Berthold can distribute radiation source size, Berthold can distribute

without the need of a State or NRC license.without the need of a State or NRC license.

SPECIFIC LICENSE: Customers may chose SPECIFIC LICENSE: Customers may chose

this method of licensing if desired.this method of licensing if desired.

Local Berthold Technologies Local Berthold Technologies Contacts:Contacts:

Knowledgeable, experienced local Sales & Knowledgeable, experienced local Sales & service Representatives are available to service Representatives are available to assist you in all U.S. states and Canadaassist you in all U.S. states and Canada

Contact our U.S. headquarters in Oak Ridge, Contact our U.S. headquarters in Oak Ridge, TN at (865) 483-2118 for the representative in TN at (865) 483-2118 for the representative in your area.your area.

In Conclusion:In Conclusion:

On a standpipe where quick level On a standpipe where quick level measurement response time is essential;measurement response time is essential;

where a reliable non-contacting measurement where a reliable non-contacting measurement is needed;is needed;

where simple empty and full calibration is where simple empty and full calibration is possible without product In the Pipe Stand;possible without product In the Pipe Stand;

Berthold level gauges are the Best Choice!!!Berthold level gauges are the Best Choice!!!