High-Yield Steel Densitometer for High-Pressure Flow Lines
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Solution Overview
Problem
Current radiometric densitometers are limited in measuring the density of fluids in large-diameter, high-pressure flow lines used in frac systems due to significant radiation attenuation through thick steel pipes, making accurate measurements impossible with conventional 7-inch pipes.
Innovation Solution
A densitometer assembly using a high-yield steel pipe with thinner walls, mounting the radioactive source and detector on the exterior, and employing a high-yield steel with a yield strength of at least 120 ksi, allowing for accurate density measurements in pipes with diameters greater than 5 inches and pressure ratings of at least 15,000 psi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional steel pipes with thick walls are used in high-pressure flow lines, then the pipe strength and pressure resistance are improved, but the radiation attenuation increases making density measurement impossible
Solution Approach 1:
The patent changes the material parameter by specifying high-yield steel with a minimum yield strength of 120,000 psi, which allows for reduced wall thickness while maintaining pressure containment. This parameter change enables thinner walls that reduce radiation attenuation to measurable levels while still satisfying high-pressure operational requirements
Solution Approach 2:
The patent applies local quality by specifying that the steel material has specific mechanical properties (yield strength ≥120,000 psi) optimized for the critical function of containing pressure while allowing radiation transmission. This localized optimization of material properties resolves the contradiction between strength requirements and measurement requirements
2Measurement precision
If the pipe wall thickness is reduced to decrease radiation attenuation, then the density measurement capability is improved, but the pipe pressure resistance deteriorates
Solution Approach 1:
The patent changes the material strength parameter to high-yield steel with minimum yield strength of 120,000 psi, which allows the wall thickness to be reduced while maintaining adequate pressure resistance. The high strength-to-weight ratio of this material enables thinner walls that permit radiation transmission without compromising structural integrity
Solution Approach 2:
The patent employs composite material thinking by selecting high-yield steel that combines high strength properties with sufficient ductility and toughness, creating an optimized material solution that simultaneously satisfies both pressure containment and radiation transmission requirements
3Measurement precision
If the radiation source activity is increased to compensate for thick pipe walls, then the measurement capability is improved, but the radiation exposure risk increases
Solution Approach 1:
The patent extracts the root cause of excessive radiation attenuation by addressing the pipe wall thickness through material selection rather than increasing source activity. By taking out the thickness parameter as the controlling factor and optimizing it through high-yield steel, the solution eliminates the need for higher radiation sources and their associated hazards
4Reliability
If conventional steel materials are used in frac systems, then the system reliability under high pressure is improved, but the radiation transmission through the pipe is blocked
Solution Approach 1:
The patent changes the steel material parameters to high-yield strength (≥120,000 psi) which fundamentally alters the balance between structural reliability and radiation transmission. This material parameter change enables the pipe to maintain both high-pressure reliability and sufficient radiation transmission for densitometer operation
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
Enables accurate and reliable density measurements of fluids in large-diameter high-pressure flow lines without increasing the radiation source's activity or detector sensitivity, reducing the risk of radiation exposure and maintaining system integrity.
Implementation Method 1
The radioactive source is adapted to emit gamma radiation in a defined beam
Implementation Method 2
significant radiation attenuation through thick steel pipes, making accurate measurements impossible
Data Source
AI summary
A densitometer assembly comprises a pipe fabricated from a high-yield steel, a radioactive source, and a detector. The radioactive source is mounted on an exterior wall of the pipe and is adapted to emit gamma radiation in a defined beam. The detector is mounted on an opposing, facing exterior wall of the pipe in alignment with the gamma radiation beam and is adapted to detect gamma radiation.