API TR 17TR9-2017 pdf download.Umbilical Termination Assembly (UTA)Selection and Sizing Recommendations.
1 Scope This technical report identifies and describes: — technical, commercial, and installation risks associated with high-functionality umbilicals and umbilical terminations [resulting in large and heavy umbilical termination assemblies (UTAs)], especially with respect to installation; — implications of decisions made early in the umbilical and subsea umbilical termination (SUT) planning, selection, and design phases, to ease the manufacturing, handling, and final umbilical/UTA installation; — guidance on specification and sizing of umbilical terminations, including overall size, weight, and handling requirements. This document is intended to aid with informed decision making and selection of optimal choices during the early design phase of field development. The primary purpose of this document is to be a reference guide during the early field development planning stage to ensure that due consideration is given to the implications of the size of UTAs and possible consequences during installation. Guidelines for the design of UTAs are included in API 1 7TR1 0. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. API Specification 1 7E, Specification for Subsea Umbilicals, Fourth Edition, October 201 0 API Technical Report 1 7TR1 0, Subsea Umbilical Termination (SUT) Design Recommendations ASME/ANSI B1 6.5, Pipe Flanges and Flanged Fittings: NPS ½ through NPS 24 Metric/Inch Standard
3.1.2 bend stiffener bend strain reliever Device for controlling bending strain in the umbilical by providing a localized increase in stiffness; usually a molded device, sometimes reinforced depending on the required duty, applied over the umbilical. NOTE 1 The stiffener is usually a molded device, sometimes reinforced, depending on the required duty, applied over the umbilical. NOTE 2 This is sometimes referred to as a “bend strain reliever.” 3.1.3 rigid length Sum of the combined lengths of the UTA and subsea termination interface (STI) and any other component that increases the axial rigid length and cannot easily be removed or reinstalled offshore. NOTE Further details are provided in 6.2.6 and Figure 5, Figure 6, and Figure 7. 3.1.4 subsea distribution unit SDU Separately installed structure that receives hydraulic and/or electric and/or optical functions from the UTA and distributes those functions to multiple locations such as manifolds or trees. 3.1.5 subsea termination interface STI Mechanism that forms the transition between the umbilical and the subsea termination (from API 17E). NOTE The interface is composed typically of an umbilical armor termination and/or a mechanical anchoring device for the tubes, bend stiffener/limiter, and tube or hose-end fittings. If the umbilical contains electric cables/fiber optics, then penetrator(s) and/or connectors may also be incorporated. 3.1.6 subsea umbilical termination SUT Mechanism for mechanically, electrically, optically and/or hydraulically connecting an umbilical or jumper bundle to a subsea system (from API 17E). NOTE Functional components within the umbilical may include hoses, tubes, and electrical or fiber-optic cables, as stated in API 1 7E. 3.1.7 umbilical Group of functional components, such as electric cables, optical fiber cables, hoses, and tubes, laid up or bundled together or in combination with each other, that generally provides hydraulics, fluid injection, power, and/or communication services (from API 17E)
4.2 Subsea Distribution Unit (SDU) SDUs can substantially reduce the overall UTA dimensions by encompassing the distribution paths and outlet ports. It is acknowledged a separate SDU may have an impact on the overall manufacturing cost in order to connect the units together, but the additional design and manufacture costs of separate UTA and SDU arrangements should not be the sole reason for opting for an all-encompassing UTA. Factors such as complicated handling, packing, transporting, increased installation costs, elevated risk of installation damage, and possible replacement of an umbilical with subsequent schedule impact must be thoroughly analyzed and assessed to make an informed decision about the split or combined arrangement of UTA and SDU. These risks should be evaluated against the consequences associated with using a separate SDU arrangement, such as additional equipment lead time, additional installation time, and the risk of additional subsea leak paths.