Flexible Pipe Inner Annulus Testing With Integrated Vent Passages
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Solution Overview
Problem
Existing methods for testing the integrity of flexible pipe inner annulus regions and venting gases within these regions are inadequate, leading to potential pipe failure due to gas buildup and inability to effectively test or vent the annular spaces between the inner barrier and seal layers.
Innovation Solution
A method involving end fittings with integrated test and vent passages allows for the introduction of a test gas to the inner annulus, monitoring pressure changes to assess layer integrity and using vent valves to prevent gas accumulation, thereby ensuring the flexible pipe's structural integrity and preventing collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional testing methods are used for flexible pipe layers, then some layers can be tested, but inner annular regions between barrier layer and seal layer cannot be successfully tested
Solution Approach 1:
The testing system is segmented into multiple independent components: a first test fluid delivery system for delivering test fluid to a first end of the flexible pipe, and a second test fluid delivery system for delivering test fluid to a second end. This segmentation allows each system to independently test different regions, including the previously inaccessible inner annular regions, thereby improving both reliability and adaptability of the testing process.
2Object-generated harmful factors
If known venting techniques are used, then some gases can be vented, but gases collecting in certain regions cannot be vented
Solution Approach 1:
The venting system uses multiple independent venting paths distributed along the flexible pipe. First and second vent fluid removal systems are positioned at different locations (first end and second end respectively), enabling gases to be vented from multiple regions simultaneously. This segmented approach ensures comprehensive gas removal coverage including previously inaccessible areas.
3Reliability
If comprehensive testing and venting of inner annulus is implemented, then integrity can be proven and gases vented, but complex end fittings and costly procedures are required
Solution Approach 1:
The test fluid delivery systems and vent fluid removal systems are designed to perform multiple functions: they can deliver test fluid for integrity testing, remove test fluid after testing, and vent gases from the inner annular regions. This multi-functionality reduces the need for specialized complex end fittings while achieving comprehensive testing and venting capabilities.
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
Enables effective testing of the flexible pipe's inner layers during assembly, reducing the risk of failure by identifying and addressing potential breaches before installation and preventing gas buildup during operation, thus extending the pipe's lifespan and reducing maintenance costs.
Implementation Method 1
If an inner barrier layer used to contain the fluids allows such gases to permeate or pass therethrough the gases can collect within the flexible pipe body
Implementation Method 2
the venting prevents build-up of permeated gases so as to reduce risk of collapse
Data Source
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AI summary
A method and apparatus are disclosed for testing the integrity of a portion of flexible pipe body (100). The method includes the steps of, via at least one port in an end fitting assembly in which an end of a portion of flexible pipe body is terminated, monitoring at least one parameter associated with an annulus region disposed between layers of the flexible pipe body, the annulus region being connected to the port by a connecting passageway (316).