Reinforced Hydraulic Hose Liner Infill for Carcass Support
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Solution Overview
Problem
Hydraulic hoses used in subsea systems are prone to failure due to the self-weight of the reinforcing carcass exceeding its ultimate tensile strength when deployed in deep water, leading to potential separation between the carcass and the liner under hydrostatic pressure.
Innovation Solution
A hose design featuring a tubular reinforcing carcass with recesses and a thermoplastic liner that includes high-infill and low-infill portions, controlled through differential pressure and cooling, to enhance engagement and support the carcass, allowing for easier processing and termination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the hose is deployed in deep water, then the hydrostatic pressure resistance is improved, but the carcass may break under its own weight
Solution Approach 1:
The liner is divided into high-infill portions and low-infill portions along the hose length. The high-infill portions provide strong carcass support in deep water sections, while low-infill portions reduce weight and allow for easier processing and termination at intermediate locations.
Solution Approach 2:
Different sections of the liner have different infill characteristics tailored to local requirements. High-infill sections are placed where maximum carcass support is needed (deep water portions), while low-infill sections are placed where processing or termination may occur, creating localized variations in liner-carcass engagement.
2Reliability
If the liner material protrudes into the recesses (high infill), then the engagement between liner and carcass is improved, but the processing and termination become more difficult
Solution Approach 1:
The liner is segmented into high-infill portions and low-infill portions. High-infill portions are located at sections requiring strong engagement, while low-infill portions are positioned at ends or intermediate sections where processing and termination operations need to be performed, making carcass removal easier.
Solution Approach 2:
The liner exhibits different infill qualities at different locations along the hose. High-infill regions provide maximum engagement where needed, while low-infill regions facilitate manufacturing processes such as termination and jointing by allowing easier carcass extraction.
3Reliability
If the liner expands under internal pressure, then the fluid containment is improved, but the carcass may separate from the liner
Solution Approach 1:
The liner is pre-formed with protrusions that extend into the carcass recesses before the hose is pressurized. This preliminary geometric interlocking ensures that when the liner expands under internal pressure, the protrusions maintain engagement with the recesses, preventing relative movement between liner and carcass.
Solution Approach 2:
The hose employs a composite structure combining the thermoplastic liner with the metallic carcass, where the liner includes high-infill portions that create a mechanically interlocked assembly. This composite design allows the liner to expand under pressure while maintaining stable engagement with the carcass through the protrusion-recess interface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design provides improved resistance to axial movement and supports the carcass effectively, facilitating easier handling and termination, while maintaining structural integrity under high pressure conditions.
Implementation Method 1
controlling a flow of the thermoplastic liner material onto the carcass and cooling the thermoplastic liner material to control an infill of the thermoplastic liner material into the recesses
Implementation Method 2
When internal pressure is applied to a hydraulic hose, this pressure causes the inner diameter of the fluid liner 12 to expand due to the volumetric expansion experienced by thermoplastic products
Data Source
Figure 1~2
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Figure 5
AI summary
The invention relates to forming a collapse resistant thermoplastic hydraulic high pressure hose for use with an umbilical, where a liner is applied to a reinforcing carcass in which the liner material is controlled to protrude into recesses on the carcass to improve the engagement of the liner and carcass and prevent relative slipping. The amount of liner material which protrudes into the recesses is controlled and may be reduced at selected portions along the hose, for example to facilitate easier removal of the carcass from the liner, for example for preparation of terminations.