API 17TR8: High-pressure High-temperature (HPHT) Design Guidelines API Special Summer Meeting - 2015 API 17TR8: High-pressure High-temperature (HPHT) Design Guidelines

Highlights on Working Items of 2nd Edition Design Verification workgroup Extreme and Survival conditions Fatigue input parameters - GoM Hydrostatic pressure tests (Deepstar Project 12302) Load-bearing design for HPHT: Load-bearing interface designs and allowables Material workgroup Material characterizations (Testing protocols)

Extreme and Survival Conditions Objectives: Define design factors for extreme & survival events Define the probability of occurrence or ‘buckets’ for extreme and survival conditions Define function and/or performance post extreme and survival scenarios Define potential impact on fatigue life for these events Participations from API 17D, 17G, 16A, and ASME

Extreme and Survival Conditions DRAFT GLOBAL PLASTIC COLLAPSE Conditions Linear-Elastic API 6A/6X/17D/17G Elastic-Plastic (LRFD) ASME Section VIII, Div. 2 ASME Section VIII, Div. 3 Normal 0.67 x Sy 2.4 1.8 Extreme 0.80 x Sy 2.0 (10-x) 1.5 (10-x) Survival 1.00 x Sy 1.6 (10-y) 1.2 (10-y) DRAFT LOCAL PLASTIC COLLAPSE Conditions Linear-Elastic API 6A/6X/17D/17G Elastic-Plastic (LRFD) ASME Section VIII, Div. 2 ASME Section VIII, Div. 3 Normal N/A 1.70 1.28 Extreme 1.42 (10-x) 1.07 (10-x) Survival 1.13 (10-y) 1.00 (10-y)

Fatigue Input Parameters Objectives: To expedite the fatigue calculation process for Gulf of Mexico application Identify and standardized input parameters Collect data Manufacturer can perform fatigue calculations based on standardized input parameters Sensitivity checks of project-specific items, as necessary

Fatigue Input Parameters DRAFT

Fatigue Input Parameters

Hydrostatic Pressure Tests Objectives: Industry’s studies to assess each design path of HPHT design flow chart and the effects of: varying hydrostatic test pressures on equipment’s strain limit damage/equivalent plastic strain and its effects on fatigue life estimation and environmental cracking resistance These studies are to include validation testing program of the analytical results Deepstar’s Project 12302 – 20ksi Systems, incorporated 17TR8 objectives into their project work scope. Project Champion: Chris Kocurek (COP)

Deepstar 12302 Executive Summary 20K working pressure for subsea equipment has been in discussion for several years now gaining more and more traction within the various operators. This CTR will perform the design verification of a representative 5” 20K TEE, per API SC17 TR8 along with a proposed validation program. This exercise will provide an example analysis that provides independent usage of API SC 17 TR8. Additionally, this CTR would have current 20K contributors and operators comment on the scope of work and the outputs of verification. This CTR is to help put into practice and provide independent design verification as outlined in TR8.

Deepstar 12302 Project Objectives and Key Deliverables Generation of a functional specification, FMECA Conduct pre-workshop to present proposed design methodology to DeepStar members and solicit input on gaps and path forward. Design verification of 5” 20K tee body, flange, bolting & gasket Proposed validation program, schedule, and cost. Workshop for initial results and proposed validation program review. Investigate the Effects of Hydrostatic Test Pressure Magnitude Load monitoring approach recommendations Cladding – NDE & Welding requirements, potential improvements Development of potential extreme and survival limits Comparison of Design Life to Total Life Post-Workshop: present verification results, solicit gaps, path forward

Material Characterizations Objectives: To define material properties necessary for Design Verification and identify gaps in 17TR8 document for material requirements With considerations to environmental effects, i.e. temperatures (min / max), H2S, CO2, Chloride, pH, etc.

Material Characterizations Testing Protocols for Properties Used in Design Verifications Tensile properties Modulus of elasticity Yield strength True-stress True-strain Reduction in area (%RA) Min specified elongation (%EL) Fatigue properties da/dN: function of frequency / R ratio, ASTM E647 S/N: function of frequency / R ratio, ASTM E466/E468 or full scale KJIC / J-a: air and temperature KIEAC: environmental and/or temp

Material Characterizations Environmental Effects for Material Testing Define environmental screening tests; SSRT, ripple SSRT, and/or ‘C’ Ring Define KIEAC test and determine if this should be upper limit for da/dN vs ∆K curves Define test parameters for da/dN vs ∆K in environment The test environment and test temperature for LASs and CRAs GoM Proposed Environments Gas Field Oil Field Cl 1,000-5,000 ppm 50,000-100,000 ppm (CO2)gas 5-20 mole % (H2S)gas 5-50 ppm pH 3-4 5-6 Temp 40 0F (MDT)