inspection of sphere legs - nondestructive · pdf fileinspection plan inspection of the legs...
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RTD-INCOTEST®Verification of sphere leg stability without removal of fire proofing
Herman J. Quakkelsteijn, February 2006
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Contents
IntroductionStability verificationPrinciple RTD-INCOTESTInspection examplesSummary
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Why?
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Stability verification
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Section strenght verification
Leftside
Right side
Reference-
Recommandations
DIN 18800/4
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Proven Strategy
Inspection plan
Inspection of the legs
Verification of stability
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Inspection and testing
Most used inspection techniques:Visual inspectionUltrasonic Testing
RTD-INCOTEST is a cost saving alternativeHigh productionNo need of special surface cleaning and preparationMonitoringOptimisation of maintenance activities
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Inspection and testing
Traditional approach:Take tank out of storage capacityErect ScafoldingRemoval of fire proofing (concrete)Sand blastingPerform Ultrasonic measurementsApply concrete
Alternative: RTD-INCOTESTMeasurements are on streamThrough fire proofingOther meanings of access possible
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RTD-INCOTEST vs Ultrasonics
Measurement deviation up to 1mm (in contact)RTD-INCOTEST and UT accuracy ± 1mm
Sample 1, Test line A
0,0
2,0
4,0
6,0
8,0
10,0
12,0
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18Grid position
Mea
sure
d W
all T
hick
ness
RTD-INCOTEST Ultrasonic Testing
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RTD-INCOTEST®
INsulated COmponent TESTOn streamThrough fire proofingScreening toolDetection of reduced WT areasMeasurement of the averageremaining wall thickness, within the interrogated area(footprint).
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Principle of operation
Pipe wall
Insulation
Sheeting
Magnetic Field
Eddy Currents
Coil
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Measurement principle
Time
Am
plitu
de
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Data display
AWT%
Inspection Grid
Signal QualityControl
Eddy CurrentDecay
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System specifications
Carbon steel (ferromagnetic)Leg thickness 6-65 mmFire proofing thickness <200 mmOne measurement takes up to 10 secondsChicken wire has no influenceSteel bars or beton ijzer can influencesignaling
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Performance
Detection of internalor external corrosion
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Performance
INCOTEST detected a 1 mm loss
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Accessibility
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Accessibility
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Reporting
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Cost savings
Conventional:ScaffoldingConcrete removalSand blastingUTApply concreteDown time
Costs: 100k€ to 300k€per tank
RTD-INCOTESTRope access or extension toolOn stream, no down timeDirectly on concrete2-4 days inspection
Costs: approx 20k€ per tank
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Cost savings
On average an RTD-INCOTEST inspection costs about 20% or less of a traditional inspection
Additional; Planning is less complicatedLess risks in terms of human and financial Less waste
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Experience
In Europe and North America over 1500 spherical tanks have been inspected, manyunder country codes.Several major oil companies now have a world wide recommendation to use RTD-INCOTEST.
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Summary
Corrosion detectionScreening toolNo direct surface contact neededNo surface preparation neededOn-streamSaves time, reduces risks and > 80% on the inspection and associated costs
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More information ?
RTD GroupRotterdam, the Netherlands
e-mail : [email protected] : +31 10 208 8 291fax : +31 10 415 8 022web : www.rtd-group.com