Iichi Ogahara

Determination of gases in metals by an improved vacuum fusion method

Abstract An improved gas extraction, collection, pressure measurement and calculation apparatus is described for use in the vacuum fusion method. It is designed for routine analysis and versatility in research investigations. The time required for gas collection is 1–2 min, including 15–60 sec for gas extraction. The total time required for a complete analysis is 7–9 min. The operating blank is 0.01–0.03 ml 30 min at 1850°. Analysis of 20 or more samples can be made in 8 hr, including loading, outgassing and gas analysis. A description is given of a newly designed gas extraction recording system for studying the optimum conditions for determination of gases in metals of current interest.

Full Scale Test Of Smoke Leakage From Doors Of A Highrise Apartment

Check of smoke leakage of an entrance door,class A fire door, for highrise apartment was carried out in a full scale model using a model fire source which was designed to smolder 1 hour and then to flame. The door openable inward and outward with and without air tight material were used. A total 13 types of experimental conditions was carried out with major variables of door situation (open or close) and of pressure difference between fire room and corridor. Concentrations of smoke, gas, and smoke particles, pressure, temperatures,and weight of fire source were measured. No difference in smoke leakage performance between doors openable inward and outward was obtained. Smoke and combustion gas in corridor were hardly observed when the entrance door was closed, therefore it suggests clearly that the middle corridor is safe enough as an evacuation route when the door was closed. KEY WORDS; FULL SCALE TEST, SMOKE LEAKAGE FROM DOOR, CLASS A FIRE TIGHT DOOR, SMOKE PARTICLES, FIRE DETECTOR, SMOLDERING