Experimental Study on the Extinguishing Efficiency of Compressed Air Foam Sprinkler System on Oil Pool Fire

The Halon 1301 fixed gas fire extinguishing system used in ship engine rooms has been banned from production all over the world, because halon destroys the ozone layer. Therefore, it is necessary to find an environmentally friendly, compatible and efficient alternative firefighting system. In this study, we performed fire extinguishing tests in an ISO9705 standard room for four alternative fire extinguishing agents, as well as Halon 1301. The fire extinguishing efficiency of each agent was determined based on its cooling effect, dilution effect of oxygen concentration, the extinguishing time of the oil pool fire and the re-ignition probability of the wood stack. The test results provide data support for the selection of alternatives of Halon 1301 from the aspect of fire extinguishing efficiency. Among these results, Novec 1230 had the best ability to put out the oil pool fire, and HFC-227ea suppressed the wood stack fire the best. The difference between the cooling ability of each fire extinguishing agent was small, and the inert gas (IG-541) displayed the best ability to dilute oxygen. Hot aerosol required the longest time to extinguish fire. Consequently, under the existing design standards, HFC-227ea had the better firefighting efficiency, more suitable to replace Halon 1301.

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Experimental study on small power generation energy storage device based on pneumatic motor and compressed air

Energy Conversion and Management ◽

10.1016/j.enconman.2021.113949 ◽

2021 ◽

Vol 234 ◽

pp. 113949

Author(s):

Yonghong Xu ◽

Hongguang Zhang ◽

Fubin Yang ◽

Liang Tong ◽

Yifan Yang ◽

...

Keyword(s):

Power Generation ◽

Experimental Study ◽

Energy Storage ◽

Compressed Air ◽

Storage Device ◽

Energy Storage Device ◽

Small Power ◽

Pneumatic Motor

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Modified method for bronchial suture by Ramirez Gama compared to separate stitches suture: experimental study

Revista do Colégio Brasileiro de Cirurgiões ◽

10.1590/s0100-69912014000300009 ◽

2014 ◽

Vol 41 (3) ◽

pp. 188-192

Author(s):

Vitor Mayer de Moura ◽

Erinaldo Rocha Paes Lamdim ◽

Felipe Souza Ferraz ◽

Rodrigo Carvalho Turatti ◽

Carolina de Barros Jaqueta ◽

...

Keyword(s):

Experimental Study ◽

The Other ◽

Compressed Air ◽

Air Leak ◽

Bronchial Stump ◽

Modified Method ◽

Tracheal Pressure ◽

Air Ventilation ◽

Manual Suture ◽

Isolated Trachea

OBJECTIVE: To experimentally compare two classic techniques described for manual suture of the bronchial stump. METHODS: We used organs of pigs, with isolated trachea and lungs, preserved by refrigeration. We dissected 30 bronchi, which were divided into three groups of ten bronchi each, of 3mm, 5mm, and 7mm, respectively. In each, we performed the suture with simple, separated, extramucosal stitches in five other bronchi, and the technique proposed by Ramirez and modified by Santos et al in the other five. Once the sutures were finished, the anastomoses were tested using compressed air ventilation, applying an endotracheal pressure of 20mmHg. RESULTS: the Ramirez Gama suture was more effective in the bronchi of 3, 5 and 7 mm, and there was no air leak even after subjecting them to a tracheal pressure of 20mmHg. The simple interrupted sutures were less effective, with extravasation in six of the 15 tested bronchi, especially in the angles of the sutures. These figures were not significant (p = 0.08). CONCLUSION: manual sutures of the bronchial stumps were more effective when the modified Ramirez Gama suture was used in the caliber bronchi arms when tested with increased endotracheal pressure.

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