CHAPTER 6 Topside process equipment og... · 11 STEP 4 Mitigation – Actual methods, cont....

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CHAPTER 6CHAPTER 6Topside process equipmentTopside process equipment

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REVIEWED DOCUMENTSREVIEWED DOCUMENTSTopside processTopside process

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STEP 0 Define system level to

be analyzed

STEP 1 Collection of information

STEP 2 Today status evaluation

Accepted?

STEP 3

1. Information collection for future operation

2. RISK assessment

STEP 4 Mitigation plan

STEP 5 Implementation

Yes

Yes

No

No

STOP

Yes Repair/

upgrade?

No

Accepted?

Repair/ upgrade?

No

Yes

LIFE EXTENSIONLIFE EXTENSIONPROCESSPROCESS

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MAIN MATERIAL SELECTIONMAIN MATERIAL SELECTIONTopside process Topside process –– NORSOK MNORSOK M--001001

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IMPORTANT INFORMATIONIMPORTANT INFORMATIONStep 1 Step 1 -- Topside processTopside process

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POSSIBLE DEGRADATION MECHANISMSPOSSIBLE DEGRADATION MECHANISMSStep 2 Step 2 -- Topside processTopside process

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STEP 2STEP 2Today statusToday status

STEP 3STEP 3Risk AssessmentRisk Assessment

STEP 0 Define system level to

be analyzed

STEP 1 Collection of information

STEP 2 Today status evaluation

Accepted?

STEP 3

1. Information collection for future operation

2. RISK assessment

STEP 4 Mitigation plan

STEP 5 Implementation

Yes

Yes

No

No

STOP

Yes Repair/

upgrade?

No

Accepted?

Repair/ upgrade?

No

Yes

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STEP 4STEP 4Mitigation Mitigation –– Actual methodsActual methods

Upgraden Repair and/or replacement of components or complete piping

including coating and insulation.

Monitoringn Monitoring process and operation parameters is an important

mitigation action for the process equipment – most important: ­ Pressure and temperature­ Content of solids (sand)­ Oxygen and chloride content­ Fluid composition (inclusive water content)

n For rotating equipment: vibration analysis n Corrosion monitoring n Sand detection and/or erosion monitoring

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STEP 4STEP 4Mitigation Mitigation –– Actual methodsActual methods, cont., cont.

Inspectionn The inspection program for subsea pipelines and flowlines is often

based on a RBI analysis n Visual inspection most frequently usedn Several different NDT techniques are available Maintenancen The output from the LE analysis can also be an update of the

maintenance program.Testingn Pressure testing can be used to verify that the systems fulfill the

defined pressure requirement. Testing is also used to control the functionality of valves (e.g. safety valves).

New barriersn Is an option topside; e.g fire protective coatings

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LACK OF KNOWLEDGELACK OF KNOWLEDGETopside process Topside process –– selected areasselected areas

n Corrosion Under Insulation (CUI)n Fatigue of small bore piping due to vibrationn Systems for estimation of remaining fatigue life of

components under varying loadsn Inspection and monitoring methods for composite

materialsn Effective NDT methodsn Non Invasive Inspection (NII) of pressure vesselsn Effect of field souring (H2S) integrity of materials?n Inspection and monitoring of wear on pumps and

compressorsn Optimisation of maintenance and inspection n More reliable estimation of material degradation through

combining modelling, monitoring and inspection

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LIFE EXTENSION ANALYSISLIFE EXTENSION ANALYSISExampleExample

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LIFE EXTENSION ANALYSISLIFE EXTENSION ANALYSISExampleExample

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LIFE EXTENSION ANALYSISLIFE EXTENSION ANALYSISExampleExample

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LIFE EXTENSION ANALYSISLIFE EXTENSION ANALYSISExampleExample

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LE ANALYSISLE ANALYSISTopside process equipmentTopside process equipment

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LE ANALYSISLE ANALYSISTopside process equipmentTopside process equipment

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LE ANALYSISLE ANALYSISTopside process equipmentTopside process equipment

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LE ANALYSISLE ANALYSISTopside process equipmentTopside process equipment

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LE ANALYSISLE ANALYSISTopside process equipmentTopside process equipment