Ballast Weight Anchor Keyway for Stable HDPE Submarine Pipelines
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Solution Overview
Problem
HDPE submarine pipelines experience issues with ballast weights moving linearly and rotating on the pipe, causing improper weighting and torsional stresses due to temperature changes, which can lead to pipe damage.
Innovation Solution
A ballast weight assembly design featuring a thrust anchor ring and anchor keyway configuration that allows the ballast weights to be securely attached to the pipeline, preventing linear movement while allowing independent rotation, thereby reducing torque forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ballast weights are attached to HDPE submarine pipelines, then the pipeline achieves proper weighting and stability, but the ballast weights move linearly and rotate on the pipe due to temperature changes, causing improper weighting and torsional stresses
Solution Approach 1:
The ballast weight assembly is segmented into distinct functional components: the ballast weight itself, the thrust anchor with anchor ring, and the anchor keyway. This segmentation allows each component to perform its specific function - the anchor ring provides attachment, the keyway prevents linear movement, and the design allows independent rotation, collectively solving the positioning reliability problem while maintaining pipeline stability
Solution Approach 2:
The anchor ring serves as an intermediary element between the ballast weight and the pipeline. It is attached to the pipeline and receives the ballast weight through the anchor keyway, mediating the connection to allow proper weighting while preventing harmful linear movement and accommodating thermal expansion/contraction through permitted rotation
2Manufacturing precision
If ballast weights are securely attached to prevent linear movement, then proper weighting is maintained, but rotation is restricted causing torsional stresses on the pipe
Solution Approach 1:
The anchor keyway design creates a dynamic connection that adapts to operational conditions. It provides precise positioning to prevent linear movement while allowing rotational movement, transforming the connection from static to dynamically adaptive, thereby maintaining positioning precision without imposing restrictive torsional stresses on the pipeline
3Strength
If the ballast weight assembly prevents rotation, then torsional stresses are reduced, but linear movement cannot be prevented causing improper weighting
Solution Approach 1:
The anchor keyway has an asymmetric geometry that selectively constrains movement in one direction (linear) while permitting movement in another direction (rotation). This asymmetric design achieves the dual objective of preventing linear displacement to maintain proper weighting while allowing rotation to protect pipe strength from torsional stresses
Data Source
AI summary
A pipeline includes a pipe and a ballast weight coupled around the pipe. The pipe includes an anchor ring extending from an exterior surface of the pipe. The ballast weight includes an anchor keyway designed as a channel into an interior surface of the ballast weight, where the anchor ring extends into the anchor keyway.