1. API SC6 Work Group Plan for Development of HPHT Flange Design Requirements Date: June 25 th, 2015

2. To provide recommendations to create a roadmap for the development of flange requirements for those sizes not currently addressed by API 6A, inclusive of those that may require application of HPHT protocols and high external load capacities. Work Group Charge

3. MEETINGS WG met on 6/17/2015 to discuss NWI from API SC6 winter meeting 2/4/2015. At meeting it was decided that the WG’s focus will be on developing the “road map” for the flange design vs. working on a particular size flange i.e. 18-3/4” 20K. Next meeting will be 7/9/2015.

4. POSSIBLE DESIGN CONSIDERATIONS New flange cross-section Make up Torque issues ( i.e. cf) Bolt material Gasket material concerns Gasket leakage and deformation Fatigue Temperature design and materials concerns Hub Separation NACE Design Criteria selection Load capacities with and w/o Temperature

5. DESIGN METHODOLOGY EXAMPLE Design Verification Design meets Load requirements Design Validation Testing Fatigue Analysis Design meets Fatigue life requirements Sealability Analysis Design Flange Structural and Functional Design Development Hub Separation Bolting 6A, 6X Taylor Forge, Eichenberg 17TR8, PER 15K Materials FEA ASTM, ASME

6. DELIVERABLES To provided Recommendations for the following Flange design philosophy Design acceptance criteria Flange external load capacities Standardized flange geometry