Metallurgical failure analysis of an exploded CO2 gas cylinder

Abstract A gas cylinder, containing carbon dioxide (CO2) in a manifold of sixteen cylinders, exploded in an outdoor building construction site at midday within two hours of its arrival from a filling station. It was to be used for construction welding. The seamless gas cylinder that exploded was made of low alloy steel with a tempered martensitic microstructure. Observation revealed the presence of discreet localized external corrosion which weakened the gas cylinder extremely. A study concluded that the midday outdoor heat had apparently increased the pressure of the carbon dioxide gas within which in turn led to the sudden catastrophic explosion of the weakened corroded gas cylinder.

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Carbon Dioxide Gas Sensor Using SAW Device Based on ZnO Film

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.135-136.347 ◽

2011 ◽

Vol 135-136 ◽

pp. 347-352 ◽

Cited By ~ 3

Author(s):

Chang Bao Wen ◽

Yong Feng Ju ◽

Wan Lin Li ◽

Wen Zheng Sun ◽

Xin Xu ◽

...

Keyword(s):

Carbon Dioxide ◽

Gas Sensor ◽

Side Lobe ◽

Center Frequency ◽

Zno Film ◽

Co2 Gas ◽

Response Characteristics ◽

Carbon Dioxide Gas ◽

Co2 Gas Sensor ◽

Carbon Dioxide Co2

Carbon dioxide (CO2) gas sensor using surface acoustic wave (SAW) device based on Zinc oxide (ZnO) was developed and fabricated in this paper. The center frequency of SAW device is 203.528 MHz. The input and two output interdigital transducers (IDT) apodized by Morlet wavelet function can improve the side lobe rejection compared with uniform IDT. The ZnO film sensitive to CO2 gas was fabricated in measurement acoustic track of SAW device. Experiments results confirm that the CO2 gas sensor using SAW device based on ZnO film has good response characteristics to different concentrations CO2 gas. Furthermore, the CO2 gas sensor using SAW device based on ZnO film has good stability and linearity.

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EGYPT, DASHUR: AN ANCIENT CO/CO2 GAS GENERATOR DISCOVERED ON THE LOWER LEVEL OF THE BENT PYRAMID OF SNEFERU

Bulletin of Kemerovo State University ◽

10.21603/2078-8975-2017-2-104-110 ◽

2017 ◽

pp. 104-110

Author(s):

A. M. Yaroschuk

Keyword(s):

Carbon Dioxide ◽

Carbon Monoxide ◽

Gas Generator ◽

Co2 Gas ◽

Lower Tier ◽

Carbon Dioxide Gas

The article researches the design and the purpose of the lower tier chamber in the Bent Pyramid of Sneferu in Dashure. The review of the earlier archeological research materials has shown that the purpose of the chamber has not been determined. In the process of the current research a technological link between the lower and the upper tiers of the pyramid has been found. It has been proven that the lower tier elements (the chamber itself, the shaft, and the chimney) all together comprised an ancient furnace – a CO/CO2 gas generator. Its purpose was to produce a mixture of carbon monoxide and carbon dioxide gas to fill the space of the upper tier of the pyramid. The goal of the architect or was to make the pyramid chambers deadly for burglars. Constructive similarities between the furnace in the lower tier of the Sneferu Pyramid and the modern CO/CO2 gas generator have been established. A theory about the presence of the secret chambers in the pyramid, including the chamber containing the Sarcophagus of the Pharaoh has been substantiated. A theory explaining the purpose of changing the shape and the construction of the Bent Pyramid specifically has been proposed.

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