API 6A 21st Edition WG - American Petroleum Institute
API 6A 21st Edition WG API Subcommittee SC-6 Discussions Valves and Wellhead Equipment May 2015 API 6A-21st Edition HPHT Progress Since January Meeting Several TG meetings with focus on comment ballot release Worked to clarify document approach to HPHT for BSEE HPHT presentation A draft document including ordered PDF (90 pages) changes has been generated and circulated for a comment-only ballot. The draft contains only proposed technical & editorial changes but no reorganization of content
May 2015 API 6A 21st Edition - HPHT 2 Work Teams/Captains Design / Jean Brunjes Materials, Welding and Cladding / Sterling Lewis Organization / Eric Wehner Qualification / Tom Lambert Quality / Mike Briggs Documentation Specialist / Jill Bell
Co-Chairs / Eric Wehner & David Zollo May 2015 API 6A 21st Edition - HPHT 3 Key Items addressed Definition of a manufacturer requirements added Tied pressure / NACE limitations to PSLs Annex M reworked to move requirements to main body of the document. Annex M is normative. PSL 4 requirements changed to align with potential HPHT requirements (no welding requirement removed) PSL 3 heat lot traceability requirement added Welding hardness survey requirements removed to default to NACE Minimum clad thickness requirement added Better definition of design criteria when referring to clad
thickness May 2015 API 6A 21st Edition - HPHT Key Items addressed May 2015 Moved repair Annex J to 6AR Removed Annex H Tools (TR needed)
Design rules moved to 6X Defined performance and product testing for bleeder plugs Revised Annex L and added 4 HPVR Added language to reference 20 series specification requirements (castings, boltingBSL-1 minimum requirement) Eliminated PR1 in Annex F Annex C stud length replaced by AWHEM TR API 6A 21st Edition - HPHT Key Items addressed Corrected valve bore metric conversion for one set of drifts (mtric/Imperial) Clarified Tree Cap dimensions by modifying tables in Annex May 2015 API 6A 21st Edition - HPHT
Plan forward Send current draft out as comment only ballot Start reorganization work / Annex Work Annex J replace by 6AR (Circulate Draft Prepared by Ed) Annex H replace with TR (Tools) Annex I & O - Eliminated Resolve comments Reorganize the entire document per Erics plan General Defined Equipment (Design excluded) Manufacturer designed equipment Address HPHT Have final document ready for ballot by June 2016 May 2015 API 6A 21st Edition - HPHT
Thoughts on HPHT Approach API Subcommittee SC-6 Discussions Valves and Wellhead Equipment May 2015 API 6A 21st Edition - HPHT Scope of 6A 20th Edition Document (Current Code) Includes 2,000 to 20,000 psi working pressure equipment PSL 1,2,3,3G & 4 All PSLs available for all pressure ratings Sour and non-sour service classes for all pressure ratings Charpy V-notch impact requirements 20 joules (15 ft-lbf) for all PSL Levels Hydrostatic testing to 1.5 times working pressure for 5KSI thru 20KSI equipment & 2 times working pressure for 2&3K Design requirements self contained: Per ASME BPVC Section VIII Div 2:2004 with some modifications External loading (bending/axial) not explicitly addressed but must be
considered when designing casing/tubing heads, tubing-head adapters,OECs, tools for running,retrieving, clean-out and testing Current high temperature derating requirements contained in informative Annex G Use of QTCs for material properties for production components Design validation by means of product testing is an informative requirement May 2015 API 6A 21st Edition - HPHT 9 Existing Supporting Technical Reports Referenced in API 6A API TR 6AF, Technical Report on Capabilities of API Flanges Under Combinations of Load
API TR 6AF2, Technical Report on Capabilities of API Integral Flanges Under Combination of Loading Phase II API TR 6AF1, Technical Report on Temperature Derating on API Flanges Under Combination of Loading May 2015 API 6A 21st Edition - HPHT 10 API 6A 21st Edition Reorganization Proposal
May 2015 API 6A 21st Edition - HPHT 11 API 21st Edition / HPHT Alignment May 2015 API 6A 21st Edition - HPHT 12 API 21st Edition / HPHT Alignment May 2015 API 6A 21st Edition - HPHT
13 Materials & QC Changes Target PSL 4 for HPHT - Bodies and Bonnets (Pressure Containing Equipment) Remove weld repair restriction to make PSL 4 usable Require prolongation or sacrificial part for material property tests Test location shall be at T/4 of prolongation or thickest section of sacrificial part Testing per heat treat batch Separate quench loads not allowed with just single prolongation BSL 3 per 20E bolting requirement (Closure Bolting)
Stud/nut hardness matching 20H HSL level 2 or 3 Furnace Calibration requirement 2 = tighter calibration and survey requirements 3 = full AMS 2750 compliance AWHEM material derating factors normative in the absence of actual test data High strength nickel alloy requirements in conformance with API 6ACRA Sour service compliance per NACE MR0175 mandatory to eliminate fouling situations where a sweet service well sours beyond NACE limits May 2015 API 6A 21st Edition - HPHT 14
API 21st Edition / HPHT Alignment May 2015 API 6A 21st Edition - HPHT 15 Design ( 15K Per Current 17TR8) Assess 17TR8 Logic 15K 17TR8 > 15K20K 17TR8 API 6X ASME Section
VIII Div2 with API allowable stresses ASME Section VIII Div2 with API material properties Elastic Perfectly Plastic Linear-Elastic For select failure mode only (unusual) May 2015 API 6A 21st Edition - HPHT
16 ASME SECTION VIII, DIV 2 True StressTrue Strain Design (>15K 20K Per Current 17TR8) May 2015 API 6A 21st Edition - HPHT 17 Design Assess 17TR8 Logic
15K 17TR8 > 15K20K PROPOSED 6A ASME SECTION VIII, DIV 2 API 6X Assess legacy 20K Flanges with newer methods Add Wall Thickness
Caveat Statement to 6A/6X. Cannot Average Stresses in Thick Wall Linear-Elastic Elastic -Perfectly Plastic True Stress-True Strain Fatigue Sensitive No Yes
Validation PR2/PR3 May 2015 API 6A 21st Edition - HPHT 18 S-N Screening Validation PR4 Fatigue screening requirements per 17TR8? For fatigue screening, we have legacy designs that are justified based on documented field history and successful performance. This is permitted under ASME BPVC Section 8, Div. 2 Paragraph 5.5.2.
Provisions of paragraph 18.104.22.168, Experience with comparable equipment operating under similar conditions. For designs where equivalency to a legacy design cannot be established, a fatigue screening analysis would have to be performed for each application to determine the necessity as well as the method to be used for fatigue analysis. Using the SN method, a screening can be conducted on high stress concentration areas to assess fatigue life and necessity to do a more exhaustive fatigue analysis. May 2015 API 6A 21st Edition - HPHT API 21st Edition / HPHT Alignment May 2015 API 6A 21st Edition - HPHT
20 Validation Currently validation via prototype testing is not a normative requirement (Annex F is Informative) 17TR8 dictates that a FMEA (failure modes and effects analysis) be conducted in order to develop an appropriate validation program Guidance for PR3 & PR4 testing are included in 17TR8 May 2015 API 6A 21st Edition - HPHT 21 May 2015 API 6A 21st Edition - HPHT
22 API 21st Edition / HPHT Alignment May 2015 API 6A 21st Edition - HPHT 23 Workgroup Proposal OR Per 6X Limit Analysis Global Plastic Collapse per
API STD 6X Tri-axial Stress (Div 2:5.3.2) Ratcheting (Div 2: 5.5.7) API 6A 21st Edition - HPHT We would take a different approach from the ASME methods and support our approach via some comparative analysis of existing 20K API flanges Leakage Criteria Separation threshold Flange Stresses 1.5 x Working Pressure Bolting Stresses
83% of yield w/temperature derating? Proposal Per 5/11/15 meeting with Paul Bunch, John Fowler, Nigel McKie, David Zollo HPHT Design FlowChart From 17TR8 Figure 1 May 2015 Analysis approach to 20K - Elastic Perfectly Plastic w/Large Strain Potential API TR 6AF3 This is (Limit analysis in 6X with large displacement) (Ref. API Std 6X Clause 6.2
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