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

2. 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)

3. 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

4. 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)

5. 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

6. Fatigue Input Parameters
DRAFT

7. Fatigue Input Parameters

8. 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 – 20ksi Systems, incorporated 17TR8 objectives into their project work scope.
Project Champion: Chris Kocurek (COP)

9. 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.

10. 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

11. 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.

12. 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

13. 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 ppm
(CO2)gas
5-20 mole %
(H2S)gas
5-50 ppm pH
3-4
5-6
Temp
40 0F (MDT)