P-107A hydrogen leak meter Final report
Flow improvement, mass flow calculations, matching cell factors, and temperature control of meter for hydrogen leakage measurements in liquid propulsion systems
MEASURING APPARATUS↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Techniques for the remote monitoring of hypergolic propellant leaks
Detection of vehicle ground support equipment malfunctions, especially hypergolic propellant leakage, for safety of personnel and hardware
LEAKAGE↗
Fixture facilitates helium leak testing of pipe welds
Fixture facilitates inspection testing of circumferential pipe welds for vacuum tightness, using helium gas as a leakage tracer in conjunction with a mass spectrometer. It consists of a split rubber torus and a mating clamping ring with a vacuum hose fitting.
Roney, J. A.↗
Quantitative leak test design guide Final report, 8 Dec. 1966 - 7 Aug. 1967
Calibrated enclosure system using helium injection method for estimating leakage rates
Hollinger, P. L.↗
Proposed standards describing and estimating leaks in aerospace hardware
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De Castra, J. E.↗
Diffusion of trace gases for leak detection - A study
Study reveals quantitative measurements of the diffusion of trace gases /Freon and helium/ injected into systems by different methods. Results show that uniform mixing does not always occur, thus evaluation of the system under test and establishment of the method of trace gas injection are mandatory.
Brown, J. L.↗
Leak detection in hermetically sealed devices
Halogen detector for leakage in hermetically sealed devices
Litant, I.↗
Vacuum leak detector features higher sensitivity
Technique for measuring partial pressures utilizes extremely large resonance scattering cross section of xenon at 1471 angstroms to scatter light in a vacuum cell. Output signal of ultraviolet-sensitive photodetector is proportional to the partial pressure and to the rate of inleakage of xenon probe gas.
Barrington, A. E.↗
Low leak rate poppet-and-seat check valve
Valve leakage due to contaminant entrapment and chattering is effectively minimized by a metallic poppet-and-seat check valve designed for use in extreme environmental and fluid temperature conditions.
Whitten, D. E.↗
Hydrogen leak and fire detection, a survey
Detection techniques for hydrogen leakage and fire
Dayan, V. H.↗
Leak detector Patent
Fluid leakage detection system with automatic monitoring capability
Lockard, M. L.↗
Hydrogen leak detection device Patent
Development of device for detecting hydrogen in ambient environments
Dayan, V. H.↗
Gas leak-detection system
Data monitoring of gas leakage in satellites and spacecraft is facilitated by adding gaseous radioisotopes to cold compressed gas and mounting a detector in the thrust nozzle.
Roselli-Lorenzini, F. G.↗
A sonic transducer to detect fluid leaks
Ultrasonic detector utilizes set of contact transducers and bandpass filters to detect and analyze sonic energy produced by flow or leakage. Detector covers wide frequency range and is operable at cryogenic temperatures and in vacuum.
Cimerman, I.↗
Directional molecular flow analysis and leak detection with a rotatable gas analyzer in a large space simulation chamber
A system was developed and applied at the NASA Manned Spacecraft Center for measuring and analyzing directional molecular flows in a large thermal vacuum chamber in order to verify molecular environment and identify characteristic and abnormal test article and chamber conditions. The system is described, and some results obtained in over 1200 hours of operation are given.
Ehlers, H. K. F.↗
Semipermanent sealing of leaks in high vacuum systems
Silicone-rubber adhesive is applied externally to seal hair-line cracks in sections of high vacuum system while system is partially evacuated. No pretreatment of surface is required since adhesive will be drawn into crack while diffusion or ion pump is off.
Christian, J. D.↗
Porous leak evaluation and application to calibration of a high-pressure ion gauge
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Hultzman, W. W.↗