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API 17D – Use of Differential Pressure in Subsea Equipment Design

API 17D – Specification for Subsea Trees and Wellheads Differential Pressure Use in Design of Subsea Equipment 12-13 June 2012. API 17D – Use of Differential Pressure in Subsea Equipment Design. Subsea Equipment Pressure Ratings - API TECHNICAL REPORT 17TR4 - JANUARY 2012

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API 17D – Use of Differential Pressure in Subsea Equipment Design

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  1. API 17D – Specification for Subsea Trees and WellheadsDifferential Pressure Use in Design of Subsea Equipment12-13 June 2012

  2. API 17D – Use of Differential Pressure in Subsea Equipment Design • Subsea Equipment Pressure Ratings - API TECHNICAL REPORT 17TR4 - JANUARY 2012 • 3.1.1 - design pressure • The maximum differential between internal pressure and external pressure during operating conditions at each cross-section. (API 1111) • 3.1.2 - rated working pressure • The maximum internal pressure a piece of equipment is designed to contain and/or control. (API 17D, API 6A)

  3. API 17D – Use of Differential Pressure in Subsea Equipment Design Document objectives: • define the framework for the use of differential pressure as well as broadly definition of paths to: • determine standards for designing equipment using differential pressure; • how to rate the equipment for differential pressure service; and • determine how to validate (test) the design of the equipment.

  4. API 17D – Use of Differential Pressure in Subsea Equipment Design • VME stress = f(∆P); not magnitude of Pi or Po • Principal stress or individual stress component failure criteria = f(Pi and Po)

  5. API 17D – Use of Differential Pressure in Subsea Equipment Design • Summary of TR4 • All loads and conditions that may realistically occur must be considered (including accidental ) • Limits must be defined for materials and loads to provide protection against the appropriate types of failure. • Limit load failure based upon VME stress is affected by differential pressure and external applied loads. • Localized stress concentration areas, such as areas of discontinuity and areas of high mean and alternating stresses, are normally where fatigue failures occur. • Principal stresses are important in analyzing failure from cyclic loading. • Other system failures, such as non-metallic seals, may be the weak link in the system instead of the pressure vessel body.

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