Composite Pipe Lining for Pressure Resistance and Drinking Water Tightness
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Solution Overview
Problem
Existing methods for renovating pipelines, particularly those carrying drinking water, face challenges in maintaining high pressure resistance and tightness while avoiding the use of harmful substances like styrene and UV initiators, which are not approved for drinking water systems.
Innovation Solution
A method involving a standard liner made of wound fiber tape layers, which is expanded and cured using compressed air and then coated with a felt tube impregnated with a liquid reaction resin, providing a barrier layer to prevent harmful substances from contaminating the water and ensuring 100% tightness and mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a standard liner made of wound fiber tape layers is used for pipeline renovation, then pressure resistance and mechanical strength are improved, but harmful substances (styrene, UV initiators) may contaminate the water-bearing interior
Solution Approach 1:
A coating layer is applied as an intermediary barrier between the standard liner and the water-bearing interior. This coating layer prevents direct contact between harmful substances from the liner material and the carried medium, while allowing the standard liner to maintain its pressure resistance function.
Solution Approach 2:
The solution combines the standard liner material (wound fiber tape layers) with an additional coating layer to create a composite structure. This composite approach allows the system to simultaneously achieve mechanical strength from the liner and chemical safety from the coating layer.
2Ease of manufacture
If UV liners are used for drinking water rehabilitation, then curing process is simplified, but hygiene requirements are not met due to unapproved chemical substances
Solution Approach 1:
The harmful UV initiator substances are extracted or removed from the system by using a coating layer that does not require UV initiators. The coating layer can be cured through alternative methods (e.g., moisture curing, chemical curing) that do not involve unapproved substances, while the standard liner underneath provides the structural framework.
3Productivity
If existing wound lining hoses are used, then cost-effectiveness is improved, but tightness and leak-proof performance may be insufficient for pressure pipes
Solution Approach 1:
The existing wound lining hose is combined with an additional coating layer to create a composite structure. This combination maintains the cost-effectiveness of using existing proven technology while adding the tightness and leak-proof performance required for pressure pipes through the coating layer.
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
This approach allows for the renovation of both sewage and drinking water pipes with enhanced pressure resistance and tightness, ensuring the exclusion of toxic substances from the water-bearing interior, enabling the use of existing wound lining hoses in a cost-effective and environmentally friendly manner.
Implementation Method 1
The resin is cured by light from a radiation source after the lining hose is pulled into the pipeline and expanded with compressed air
Implementation Method 2
expanded by means of compressed air, so that the lining hose rests against the inner wall of the pipe to be rehabilitated
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A method for renovating a line (1) which carries a liquid or gaseous medium, in which method a first lining tube (10) formed from overlappingly wound fibre bands (2) impregnated with a curable liquid reaction resin is drawn into the line (1), the lining tube (10) is expanded by introducing compressed air and the reaction resin is cured, is distinguished by the fact that, after curing the reaction resin, a second lining tube (20) is introduced into the cured first lining tube (10) by being pushed in and comprises a peripherally closed inner film layer (22) and, laminated thereon, a non-woven layer (24) which is impregnated with a further reaction resin, wherein the second lining tube (20) is expanded by introducing compressed air or liquid and, subsequent thereto, the further reaction resin is cured.