api 17d – specification for subsea trees and wellheads differential pressure use in design of...
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API 17D – Specification for Subsea Trees and WellheadsDifferential Pressure Use in Design of Subsea Equipment12-13 June 2012
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• 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)
API 17D – Use of Differential Pressure in Subsea Equipment Design
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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.
API 17D – Use of Differential Pressure in Subsea Equipment Design
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• VME stress = f(∆P); not magnitude of Pi or Po
• Principal stress or individual stress component failure criteria = f(Pi and Po)
API 17D – Use of Differential Pressure in Subsea Equipment Design
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• 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.
API 17D – Use of Differential Pressure in Subsea Equipment Design
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