Design Methods for Subsea Equipment for Extreme and Survival Load Conditions

This paper posits a design method for subsea equipment governed by American Petroleum Institute (API) Specification (spec.) 17 (and particularly 17D).

March 31, 2015

Journal of Petroleum Technology

Fig. 1—A 3D, 180° FEA model of the 4-in., 20-ksi API Type 6BX flange with 3D bolts and rigid bottom surface simulating the flange bottom.

This paper posits a design method for subsea equipment governed by American Petroleum Institute (API) Specification (spec.) 17 (and particularly 17D). Fatigue-life estimation is also addressed for these conditions. An analysis of a subsea-tree component is reviewed, evaluating its combined load capacity for normal, extreme, and survival conditions. Additionally, the fatigue life-cycle estimation for this component is included.

Introduction

The API spec. 17D and spec.

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