hpht flange design - american petroleum institutemycommittees.api.org/standards/ecs/sc6/meeting...
TRANSCRIPT
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HPHT Flange DesignSince the Winter meeting:• Met four (4) times • Working on Flange Design Methodology (By the winter
meeting we will have a step-by-step description of the Flange Design Methodology to size the flange (based on Eichenberg) and a step-by-step description of the Flange Verification Methodology to create the Capability Charts for 6AF3 (using non-linear FEA).)
• Much of the work since the winter meeting was dedicated to justifying the existing BX gaskets suitability for the HPHT applications
• For the winter meeting we will demonstrate the step-by-step method by designing and verifying the capabilities of an 18-3/4 20K flange
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BX 164 Gasket FEA StudyRound Table Discussion
BX Gasket Dimension Comparison with API 6A
Kevin Leaning LTS Energy
Gasket Study Jon Ellens NOV
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Review of Eichenberg Calculation Methods
DESIGN REVIEW
1. COMPARE EICHENBERG CALCULATED GASKET AND RING GROOVE GEOMETRIES AGAINST CURRENT API 6BX 10K, 15K & 20K SIZES
2. ESTABLISH A “BASELINE” ANALYTICAL DESIGN CALCULATION WORK SHEET BASED ON EICHENBERG CALCULATION METHODS
3. EVALUATE EICHENBERG FLANGE CALCULATION METHODS AGAINST “ALL” CURRENT API 20K 6BX FLANGE/GASKET GEOMETRIES
4. EVALUATE EICHENBERG FLANGE CALCULATION METHODS USING EICHENBERG 20K FLANGE/20K GASKET GEOMETRIES
5. ESTABLISH EICHENBERG DESIGN FOR 18.3/4” 20K WN FLANGE & GASKET5. SUMMARY OF RESULTS USING EICHENBERG CALCULATION METHODS FOR 20K
FLANGE AND GASKETS
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Review of Eichenberg Calculation Methods
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BX Gasket Dimension Comparison with API 6A
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Review of Eichenberg Calculation Methods
EICHENBERGAPI 2.1/16” 20M BX-152
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Review of Eichenberg Calculation Methods
EICHENBERGAPI 18.3/4” 20M 164-E
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Review of Eichenberg Calculation Methods
SUMMARY
1. ALL CURRENT API 20K 6BX FLANGE GEOMETRIES MEET EICHENBERG FLANGE CALCULATION METHODS. EXCEPT FOR BX-RINGS AND RING GROOVES.
2. API 20K 6BX FLANGES WILL MEET EICHENBERG FLANGE CALCULATION METHODS IF USING EICHENBERG CALCULATED RINGS BX-E.
3. EICHENBERG METHODS CAN BE USED TO DESIGN AN API 18.3/4” 20K BX-164-E FLANGE AND GASKET.
4. THE BX-164-E WILL EFFECTIVELY SEAL AGAINST 30K HYDROTEST PRESSURE, AND WOULD PERFORM BETTER THAN THE EXISTING BX-164 GASKET ORIGIONALLY DESIGNED FOR 10K SERVICE.
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BX-164 Gasket StudyResidual Contact Force
Evaluated with FEA
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Mesh
• 43,198 nodes
• 37,774 elements (all first order hex)
• 1/40 Symmetry Applied
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Loading
Wellbore Pressure Application
Pressure End Load
Rigid surface w/ contact enforced for flange
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Loading Application
1. Preload bolts
– 40 ksi preload
2. Fix bolt length
– Standard Abaqus procedure for preloaded bolts
3. Apply wellbore pressure
– 20, 30, 40 ksi (each pressure run as separate analysis)
4. Remove wellbore pressure
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Materials
• Gasket– Elastic-Plastic: Two Gaskets Evaluated
• 30/75 ksi YS/TS• 50/90 ksi YS/TS
• Flange and Bolts– Mostly Linear-Elastic (see image, blue)
• Flange groove area– Elastic-Plastic in some analyses to evaluate plastic strain upon
preload (75/95 ksi YS/TS)
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Gasket Model
Minimum Material Condition - Evaluated
vsNominal
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0
10000
20000
30000
40000
50000
60000
70000
80000
15 20 25 30 35 40
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Wellbore Pressure (applied then relieved, ksi)
Residual Normal Contact Force vs Wellbore Pressure
30k Gasket
50k Gasket
30k Gasket - EP flange
50k Gasket - EP Flange
Residual Normal Contact Force –Outer Diameter
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Preload Comparison30 ksi Gasket 50 ksi Gasket
Flange groove area modeled as elastic-plastic (75/95 ksi)
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HPHT Flange Flowchart – Gasket Selection/Design
Same size and lower pressure BX gasket available?
Evaluate using existing gasket
Verify using 3D FEA –Acceptable residual contact force study?
Would increased strength gasket be acceptable (50 ksi YS, verified with 3D FEA residual contact force study)?
Create new gasket / groove geometry (Eichenberg or alternative methods)
Continue with HPHT flange design and verification
Yes
No
Yes
No
Yes
No