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API 17 – Subsea HPHT Discussion

HPHT Design. Design. Performance Test. Materials. API 17 – Subsea HPHT Discussion.

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API 17 – Subsea HPHT Discussion

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  1. HPHT Design Design Performance Test Materials API 17 – Subsea HPHT Discussion PER 15K : “… should be used as a guide by the various API Subcommittees to develop future documents on equipment specifications for HPHT service. This report is not intended to replace existing API equipment specifications. … intended to illustrate accepted practices and principles that may be considered…” • Design Methodology has been in review and development for 5+ years and relies on ASME BPVC, Section VIII, Division 2 or 3. • But no clear guidance when/where to switch from Div 2 – “Thin wall” to Div 3 – “Fracture Mech.” • No industry (operator) guidance on Validation Testing. • What constitutes “acceptance”? Is it Annex F or something tied to fatigue life/fracture mechanics? • Material Properties for pressure containing and pressure controlling components showing clarity on what’s needed in last 2 years. • But no data on material ‘s HPHT properties published for widespread use. • No clear path yet on seal technology. 1

  2. Elastic vs. Elastic-Plastic Most agree that for HPHT, E-P or Load-Limit + FAD (fracture mechanics) is way to go. The question: When do we switch? The question: How do we balance between 6A which has 20k and 350 and 17D which has 15k and 350?

  3. Validation Testing The question: When is Annex F testing is no longer valid? Is Annex F only valid for elastic design / functional testing? What level of testing is desired when fatigue design life is identified?

  4. Materials Issues • Main material use groups for HPHT • Pressure Containing • Pressure controlling • Fasteners • Seals • What pressure containing/controlling properties need to be met? • Tensile, Yield, modulus @ elevated temperatures • Tensile/yield ratio • da/dn @ temperature & environment • K1C, J1C, K1SCC for ranking • Fatigue life at temperature • Affect of cathodic protection - hydrogen • Seals - creep resistance • Fasteners - stress relaxation

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