FSM-DW-November HALLGEIR.ppt

1、Hallgeir Jenssen Senior Sales -Integrity -Plan inspection and -Input for (Risk based) Inspection Planning Trough improved corrosion control, justify use of carbon steel instead of expensive, corrosion resistant alloys.,Corrosion and Condition Monitoring Using the FSM DW Technology,FSM - The Electric

2、 FingerprintField Signature Method,A non-intrusive method for monitoring internal general and localised corrosion, erosion and cracking of process pipes and pipelines Offers the markets highest sensitivity. Responds to changes in thickness of the actual pipe wall in real time FSM may provide substan

3、tial savings due to improved corrosion control and reduced inspection cost,FSM Features,Sensitivity better than(1 ppt=1:1000) 1 Thousand part of the pipe wall (0,3ppt on FSMLog and subsea systems ) Detects changes in the actual pipe wall Provides information on corrosion mechanism Monitors relativel

4、y large area and different geometry e.g. welds,FSM Principle,5 Parts of an FSM System Pipe Wall to Monitor Pin Matrix/ Measuring electrodes Current Source (input/output) Electronics to take/store readings Software to interpret the data,FSM Principle,Basic Electricity,Ohms Law With respect to the FSM

5、- matrix on the pipe wall the length, L, and width, W, of the matrix stay contant The current, I, is known and controlled by the FSM- instrument Therefore the only two variables left are thickness, T, of the pipe wall and the potential drop,L This means that as the pipe wall corrodes (thickness decr

6、eases) the potential drop increases (FSM-IT reading) Therefore the FSM-IT instrument can monitor the corrosion happening between each pin pair that is fixed to the pipe wall,Pipe with current excitation and a local defect in the weldShows how the current distribution and voltage potentials will chan

7、ge around the defect,FSM metoden,THE PROBLEM:TYPICAL FLOWLINE CORROSION,Weld Root Corrosion,Pitting Corrosion,Tee-Pipe fixed for Machining,Current feed point,Pins either side of weld,Pins on base metal,After Machining,Machined weld Groove (Approx. 4mm wide),Sensing pins,TEE WAS SECTIONED XY-plot,1.

8、Start of test,2. Defect depth 0.5mm,3. Defect depth 1.5mm,RESULTS OF WELD CORROSION TEST,4. Defect depth 2.5mm,Pin Matrix & defects on test plate,Sensing pin matrix on underside of plate,Defects caused by electrochemical etching on topside of plate,1. Start of test,2. After 1hour,RESULTS OF PITTING

9、TEST,4. After 5hours,3. After 2 hours,FSM- Sub-sea: The most accurate measuring wall thickness method available in the market.,Why Sub-sea Corrosion Monitoring?,Less expensive materials Lower corrosion allowance Accurate inhibitor use Improved inhibitor efficiency Reduced pigging frequency Remove pi

10、g launchers and catchers,Subsea Corrosion Monitoring utilising the field signature method,The North Sea has been a laboratory for development of new technology The field signature method was developed at the University of Oslo and patented in 1987 An industrial monitoring system was developed on the

11、 basis of the field signature method. Non intrusive technology - low risk First installations topside in 1990 First installation subsea in 1994 Now used as a tool in pipeline corrosion and erosion management,Why Sub-sea Corrosion Monitoring?,20 years of Corrosion Protection and Corrosion Monitoring

12、Corrosion prediction models The only field proven subsea corrosion monitoring system,What can we tell you aboutcorrosion conditions inside your pipelines?,General corrosionSensitivity better than 0.05 % of wtTrending over 7 days: Better than 2.5% wt/yrTrending over 30 days: Better than 0.5% wt/yr Co

13、vers a larger area of the pipe Increased sensitivity Qualified for 10,000 ft / 3000m water depth Qualified for 284 F / 140 C Qualified for installation with insulation,FSM Sub-sea parts,RIU,NRIU,TRAFO.,FSM Communication,FSM DW System overview,PC,with Multi-Trend,transparent Communications:,FSM RIU/

14、NRIU,Measurement matrix,FSM SPOOL,FSM Matrix with 4 to 10” rubber vulcanization,SEM with power and com,Subsea com and power unit,Controll system,FSM data example,Subsea - Canada Installed 1999 Battery powered Hydro Acoustic communication,FSM data example,FSM supported by ER probe,FSM Measured data,B

15、lock 18 DW SubSea FSM Spool installation. Angola, march 2007.,Pipe lay Barge. Big crane and a huge J-Lay tower for vertical laying of pipes. Used for depths more then 300 meters.,Pipes arebeing lifted from supplybarge ontothe “Polaris”.The pipes are 25 meters long.,Here the pipe is being lifted up into the “lift” up to the derrick. The pipe is being machined at the ends and then internal sandblasted. This actual pipe is the FSM spool (no. 225),FSM DW,Installation and testing in J-Lay tower,FSM spool (pipe