Riserless Casing Spacer With Polymer Runners
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Solution Overview
Problem
Existing casing spacer designs for carrier pipes in underground applications are prone to damage, costly, and complex due to the use of risers and weldments, which are susceptible to failure under dynamic and static loads and provide limited electrical insulation.
Innovation Solution
A riserless casing spacer design featuring metal shells with integrated PVC liners and ultra-high molecular weight polyethylene runners, securely attached without the need for risers or weldments, providing stable support and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If risers and weldments are used in casing spacer design, then structural strength and support capability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent removes the riser component entirely from the casing spacer design. Instead of using separate risers attached to the spacer band, the design integrates support functionality directly into the spacer band itself through formed support structures, eliminating the need for additional parts and assembly steps while maintaining structural strength
Solution Approach 2:
The patent combines the functions of the spacer band and risers into a single integrated component. The support structures are formed as integral parts of the spacer band, merging what were previously separate components (band and risers) into one unified structure that provides both spacing and support functions
2Strength
If weldments are used to attach runners to casing spacer, then attachment strength is improved, but manufacturing complexity and susceptibility to load failure increase
Solution Approach 1:
The patent replaces the weldment attachment method with a mechanical fastening system using bolts and nuts. Instead of joining runners to the spacer band through welding, the design uses threaded fasteners that provide secure attachment while avoiding the complexity and potential failure points of weldments under dynamic and static loads
3Ease of manufacture
If wooden spacers are used, then ease of manufacture is improved, but durability and reliability deteriorate due to rot, swelling, and degradation
Solution Approach 1:
The patent employs composite construction by combining a metal spacer band with plastic or polymer support structures. This composite approach provides the durability and resistance to environmental degradation (rot, swelling, corrosion) associated with metals and plastics, while maintaining ease of manufacture through fabrication processes such as forming and mechanical fastening
4Ease of manufacture
If wooden spacers are used, then cost is reduced, but electrical insulation capability deteriorates
Solution Approach 1:
The use of plastic or polymer materials for the support structures provides inherent electrical insulation properties while maintaining cost-effectiveness. The composite design with plastic components ensures electrical isolation of the carrier pipe without requiring additional insulation layers or materials
Data Source
AI summary
A casing spacer includes a pair of generally semi-cylindrical metal shells disposed on opposed outer surface portions of a carrier pipe for securely maintaining the pipe in fixed, spaced relation from the inner surface of an outer casing. Opposed ends of the shells are connected together by nut and bolt combinations for securely attaching the casing spacer to the carrier pipe. Plural runners are directly attached in a spaced manner to the outer surfaces of the metal shells by respective nut and bolt combinations inserted through apertures in the casing spacer's metal shells for engaging the outing casing's inner surface in maintaining fixed spacing between the pipe and outer casing.