Segmented Insulation Tube Water Barrier
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Solution Overview
Problem
Insulation in buried gas or liquid transport tubes, typically using PU-foam, degrades when exposed to moisture, leading to extensive and costly replacements due to uncontrolled damage extension and difficulty in assessing damage extent.
Innovation Solution
A water barrier is introduced within the PU-foam layer, comprising a thermoplastic shrink sleeve and a hardening material to prevent further moisture migration, allowing precise damage assessment and reducing replacement lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous PU-foam insulation layer is used around the transporting tube, then good thermal insulation is achieved, but moisture can migrate uncontrollably through the entire insulation material when outer tube damage occurs
Solution Approach 1:
The continuous PU-foam insulation layer is divided into multiple segments by inserting water barrier elements at intervals along the transporting tube. These barriers segment the insulation into separate zones, preventing moisture from migrating continuously through the entire insulation layer when outer tube damage occurs, thus limiting damage extension while maintaining insulation effectiveness in each segment.
2Reliability
If the outer tube is damaged and moisture penetrates the PU-foam, then the insulating properties reduce drastically, but the complete insulation casing must be replaced over a large length
Solution Approach 1:
By segmenting the insulation layer with water barriers, the system isolates moisture damage to specific zones between barriers. When outer tube damage occurs, only the insulation segment containing the damage needs replacement, not the entire insulation casing, thus reducing material loss and replacement costs.
Solution Approach 2:
Water barrier elements are pre-installed within the PU-foam insulation layer during manufacturing or installation. These barriers are positioned in advance to create predetermined stop points for moisture migration, enabling limited damage containment before any outer tube damage occurs.
3Measurement precision
If moisture penetrates the PU-foam through outer tube leakage, then damage extension is difficult to assess, leading to unnecessary replacement of large tube sections
Solution Approach 1:
The insulation structure is divided into discrete segments by water barriers, creating clear boundaries for damage assessment. When moisture penetration occurs, the damage is confined to specific segments, making it easy to identify and measure the exact extent of damage without unnecessary speculation about broader contamination.
Solution Approach 2:
Water barrier elements act as intermediary components between moisture sources and the PU-foam insulation. These barriers provide visible, physical indicators of moisture migration paths and stop points, facilitating accurate damage assessment by showing exactly where moisture has reached and been contained.
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 solution effectively limits damage extension and enables accurate determination of replacement lengths, reducing replacement costs and labor by creating a watertight barrier within the insulation system.
Implementation Method 1
a thermoplastic shrink sleeve and a hardening material to prevent further moisture migration
Data Source
Figure 1~2B
Figure 3A~3B
Figure 4A~5C
AI summary
A thermally insulated transport tube (1) is provided with an outer tube (2) arranged around the transport tube (1) and an insulation foam (4) arranged in the annular space (3) between the transport tube (1) and the outer tube (2). In one or multiple positions, a water barrier is arranged which interrupts the insulation foam in axial direction. The water barrier may be formed by a solid and water-tight substance (70) that adheres well to the transport tube and to the insulation foam (4).