Umbilical Junction Box Layout for Isolating Hydraulic Leaks
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Solution Overview
Problem
Current junction boxes for subsea umbilicals do not allow for isolation of individual sections, making it difficult to detect and address leaks or blockages, leading to unnecessary replacement of entire umbilical systems and increased operational costs.
Innovation Solution
A junction box design that includes a network of main pipes and auxiliary pipes with valves, enabling each section to be isolated and tested independently for hydraulic flow control, allowing for diversion of flow between non-subsequent hydraulic lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If traditional junction boxes are used to connect umbilical sections, then the connection is simple and reliable, but the ability to isolate and test individual sections is lost, making leak detection difficult
Solution Approach 1:
The junction box is divided into multiple isolated chambers, each capable of being sealed independently. This segmentation allows individual umbilical sections to be isolated for testing without affecting other sections, enabling precise leak detection while maintaining overall system functionality.
Solution Approach 2:
Test ports and isolation valves are introduced as intermediary elements between the umbilical sections and the external environment. These intermediaries enable controlled testing and isolation operations, facilitating leak detection without requiring complete system disassembly or replacement.
2Reliability
If complete umbilical replacement is performed to address leaks, then reliability is restored, but operational time and resource costs increase significantly
Solution Approach 1:
The junction box is pre-configured with isolation valves and test ports that enable proactive testing and localized repairs. This preliminary preparation allows operators to detect and address leaks in specific sections without proceeding to complete umbilical replacement, significantly reducing downtime and resource consumption.
Solution Approach 2:
Instead of discarding the entire umbilical system when a leak is detected, the invention enables selective replacement of only the affected section. The functional sections are recovered and retained, reducing material waste and operational disruption while restoring system reliability.
3Ease of manufacture
If umbilical sections are made longer to reduce the number of junction boxes, then installation is simplified, but leak detection and isolation become more difficult
Solution Approach 1:
Even within longer umbilical sections, the junction box maintains internal segmentation through isolated chambers and valves. This allows the long section to be installed as a single unit for ease of installation, while still enabling precise leak localization through controlled isolation and testing of individual segments within the junction box.
Data Source
AI summary
The present invention relates to junction boxes for umbilicals. In this context, the present invention provides a junction box for connecting two umbilical sections, comprising a plurality of main pipes (2), suitable for individually connecting a plurality of hydraulic hoses (I) of a first umbilical section to a plurality of hydraulic hoses (I) of a second umbilical section, in which the junction box also comprises an auxiliary pipe network (3) hydraulically connecting all of the main pipes (2).