Pipeline Explosion Load Speed Calculation via Crack Growth
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Solution Overview
Problem
There is no effective method to estimate the internal explosion load speed in pipelines after an explosion, which is crucial for determining the type of explosion (deflagration or detonation) and investigating accidents.
Innovation Solution
A method that calculates the internal explosion load speed based on the incremental crack growth distance of a pipeline by measuring average incremental growth distances of forward and backward cracks, calculating the natural vibration frequency, and using a specific ratio to determine the explosion load speed through a formula.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no effective method is used to estimate explosion load speed, then the explosion type cannot be determined, but the accident investigation cannot proceed
Solution Approach 1:
The patent replaces direct mechanical measurement of explosion load speed with a calculation method based on crack growth distance measurements and natural vibration frequency. Instead of using complex high-speed measurement equipment during explosion, the method uses post-explosion crack pattern analysis combined with a calculation formula to determine the explosion load speed, thereby simplifying the measurement system while maintaining accuracy.
Solution Approach 2:
The patent introduces crack growth distance as an intermediary parameter to estimate explosion load speed. Rather than measuring the explosion load speed directly, the method measures the distance between crack markings (which are easier to measure post-explosion) and uses this as a proxy to calculate the explosion load speed through the established formula, making the measurement process feasible and accurate.
2Reliability
If crack growth distance measurements are taken to estimate explosion load speed, then accurate explosion type determination is possible, but multiple measurement parameters are required
Solution Approach 1:
The patent makes the crack growth distance measurement serve multiple functions: it simultaneously provides information about crack propagation characteristics, explosion load speed estimation, and explosion type determination. By establishing a universal relationship between crack growth distance and explosion load speed, the same measurement parameter (crack distance) is used for multiple analytical purposes, reducing the need for separate measurements for each objective.
Solution Approach 2:
The patent transforms the measurement parameter from direct explosion load speed (which is difficult to measure) to crack growth distance (which is easily measurable post-explosion). By changing the measured parameter to something that correlates with the desired information and is more accessible for measurement, the method reduces measurement complexity while maintaining determination accuracy.
3Speed
If natural vibration frequency calculation is included in the method, then explosion load speed can be calculated, but additional material properties are needed
Solution Approach 1:
The patent requires that material properties (elastic modulus, density, Poisson's ratio) be determined beforehand through standard material characterization tests. By performing these measurements in advance rather than during the explosion analysis, the method prepares all necessary parameters ahead of time, making the actual explosion load speed calculation straightforward and reducing the difficulty of on-site measurement.
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
Provides a comparative accurate estimation of internal explosion load speed, enabling the inference of explosion type and aiding in accident analysis with a high calculation accuracy.
Implementation Method 1
a step S2 of calculating the natural vibration frequency ƒ0 of the pipeline
Data Source
AI summary
The present disclosure discloses a method for calculating an internal explosion load speed based on an incremental crack growth distance of a pipeline. The method includes steps of: respectively measuring at least three groups of distances between neighboring markings on forward and backward crack surfaces, and calculating the average values respectively to obtain the average incremental growth distances of forward and backward cracks; calculating the natural vibration frequency of the pipeline; and setting the ratio of backward crack speed to forward crack speed of the pipeline, then calculating the internal explosion load speed of the pipeline by a formula. The present disclosure provides a new effective method for calculating the internal explosion load speed based on the available parameters of the ruptured pipeline after explosion, which can provide a comparatively accurate estimation of internal explosion load speed, thereby providing references for inferring the explosion type occurred in the pipeline.