Steel Pipe Ballast Sheath Spacer Integration
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Solution Overview
Problem
The existing methods for producing steel pipelines with ballast casings for offshore transportation of media are time-consuming and costly due to the need for separate spacers for reinforcement, which complicates installation and warehousing.
Innovation Solution
Integrating spacers directly into the thermoplastic casing during extrusion, eliminating the need for separate spacers and allowing for uniform distribution and adjustable geometry, with a T-profile design providing clamping for the reinforcement and increased static friction through material particles between coating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate spacers are attached to the plastic casing surface, then the reinforcement is properly supported and concrete is clamped to the pipe, but the installation becomes time-consuming and expensive
Solution Approach 1:
The spacers are integrated directly into the plastic casing as a unified component during the extrusion process, eliminating the need for separate spacer attachment. This merging of functions (casing + spacers) streamlines production and installation while maintaining structural integrity and concrete clamping capability.
Solution Approach 2:
The spacers are formed as part of the plastic casing during the extrusion process itself, before the casing is installed. This preliminary formation of spacers eliminates subsequent attachment steps and complex warehousing requirements, significantly improving installation productivity.
2Manufacturing precision
If separate spacers are used for reinforcement attachment, then proper concrete coverage is ensured, but complex warehousing and handling are required
Solution Approach 1:
The spacers and plastic casing are combined into a single integrated component manufactured during extrusion. This eliminates the need to manage separate spacer inventories, reduce handling steps, and simplify warehousing operations while ensuring consistent concrete cover through precise extrusion geometry.
Solution Approach 2:
The plastic casing manufacturing process automatically produces the spacers as an integral part of itself during extrusion. The extrusion tooling is configured to form spacers with the required geometry and distribution, making the system self-sufficient and eliminating external spacer supply chains.
3Reliability
If multi-layer plastic coating is used for corrosion protection, then corrosion resistance is improved, but relative displacements between layers can occur during laying
Solution Approach 1:
Material particles are introduced between the plastic coating layers to create a roughened interface that increases static friction. This controlled porosity or surface irregularity prevents relative displacement between layers during pipeline laying while maintaining the corrosion protection function of the multi-layer system.
4Strength
If T-profile spacers are used with web height of at least 1 mm, then effective clamping of reinforcement is achieved, but material consumption increases
Solution Approach 1:
The T-profile geometry parameters (web height ≥1 mm, transverse part width ≥2 mm) are optimized to provide sufficient clamping force for reinforcement while minimizing material consumption. The extrusion process allows precise control of these dimensions to achieve the minimum required values that balance strength requirements with material efficiency.
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
Simplifies the production process, reduces costs, and ensures effective clamping and corrosion protection while maintaining mechanical integrity and static stability of the pipeline.
Implementation Method 1
the spacers are not attached as separate parts to the surface of the plastic casing but are designed as part of the plastic casing and were created during extrusion. The production of the pipes with a ballast casing is realized according to the invention by a method in which the concrete covering of the reinforcement realizing spacers are now produced in the course of the extrusion of the plastic casing by a corresponding profiling of the thermoplastic material during the extrusion.
Implementation Method 2
the covering that increases the static friction of the cladding layers lying one on top of the other can consist of material particles that are applied to the surface of the cladding layer and are thus firmly bonded. According to the invention, the increased static friction is achieved by increasing the roughness between the friction partners
Data Source
AI summary
The invention relates to a steel pipeline with ballast sheathing, particularly for offshore installation, for the transport of liquid or gaseous media, wherein the individual pipes of the pipeline are provided with an extruded single- or multi-layer thermoplastic sheathing and a reinforced concrete sheathing as ballast, the reinforcement of the concrete being designed as a steel mesh which, to achieve a concrete cover, is supported by spacers attached to the plastic sheathing. The spacers (5) are not attached as separate parts to the surface of the plastic sheathing (2, 4), but are formed as part of the plastic sheathing, which were produced during the extrusion of the plastic sheathing.