All issues
Volume 5 (1955 - 1956･･･
- Issue 3 Pages 69-
- Issue 2 Pages 33-
- Issue 1 Pages 1-
Volume 5, Issue 3
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
Paper
-
Tadao MORIYA1956 Volume 5 Issue 3 Pages 69-72
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSA stick of wood is suspended vertically and ignited at the lowest part, then it burns upwards increasing gradually in the burning speed. But, when the middle part of the stick is burning, the burning speed is kept constant. At the time, by measuring the weight-decreasing of the stick, the burning speed can be known. Such burning speeds were measured about many sticks which were equal in size, but contained water at different proportion.
Relations between burning speed and water contents are shown in a empirical formulae as follows :
u∝w-1/3
except for near zero. In the formulae w is the burning speed in weight and u is the water content of wood stick.View full abstractDownload PDF (400K) -
Iwao OKI, Minoru SHIMOSAKA1956 Volume 5 Issue 3 Pages 73-75
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSA series of experiments were carried out, from the evening of 20th, Aug. 1955 till the next morning at Higashi-kanda-Machi, Chiyoda-ku Tokyo, to investigate the discharging capacity of the pipe nets of the municipal water supply system in that district. Applying differential mercury manometers to each of the three pipe lines, one 100mm, two 150mm in diameter, the relations between the rate of flow and the loss of head in each pipe line were carefully determined. As the results we have made clear that the average rate of flow in these pipe lines now are less than 50% of what it must have been when they were new. These pipe lines have been in use for 30～40 years.View full abstractDownload PDF (277K) -
Tsuruji OKAWA, Shigenao MURAYAMA, Tadashi WACHI1956 Volume 5 Issue 3 Pages 76-79
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSThe most important factor in fire fighting at the scene of fire is a good combination of water, pumps and hose. Recently fire pumps have been much improved and many new fire trucks equipped with excellent pumps are distributed at fire stations, but unlined linen fire hose, that is the standard equipment of Japanese Fire Departments, seems to be behind in progress when compared with fire pumps.
The improvement of the present hose will mean indirect reinforcement of the existing fire fighting strength.
As the first approach towards the above improvement, we have made a series of tests on unlined linen hose of our Fire Department and found that each piece of hose tested showed some deterioration, while considerable number of pieces found unfitted for normal use. From these results we felt keenly that the improvement of hose quality along with the development of better maintenance and handling procedure is a key to our present problem of hose.View full abstractDownload PDF (366K) -
Tsunekatsu KUROKAWA, Tsuruji ŌKAWA, Masazō FUDEUCHI, Fumiaki ...1956 Volume 5 Issue 3 Pages 80-84
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSThe following is a report on the results of our recent experiments made on the water hammering effects in fire hose stream.
The conclusions obtained are summarized as follows :
1. The pressure rise in fire hose and the velocity (α) of pressure wave caused by water hammer have satisfied the Joukowsky’s formula.
2. The above velocity (α) measured for plain-woven linen hose, plain-woven cotton hose and circular-woven cotton hose is respectively 230m/sec, 187m/sec and 156m/sec.
3. The variation of pressure, due to the close of cock, was measured at three points ; the base of nozzle, the middle of hose-line and the discharge outlet of pump. Among these three readings, the greatest was at the nozzle base, and the least at the discharge outlet.
4. When the cock was opened suddenly, the amount of pump pressure drop was found proportionate to the pressure at nozzle base before the opening of cock.View full abstractDownload PDF (503K) -
Sanyo HORI1956 Volume 5 Issue 3 Pages 85-86
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSIn the previous paper the author has reported on the outline of the burning figures of paper tubes piled up on a inclined plane and the abilities of reappearance of the burning figures two or three dimensionally.
This times, the figures were investigated three dimensionally, and some theoretical considerations were given on them, assuming that the velocities of flame propagation or the burnt figures were almost comparable each other in the different series of experiments when their areas were in the same order of magnitude.
Tubes with various diameters, both end of which being closed or opened, were used, and the velocity of the upward wind along the inclined plane was varied by changing the slope. Thus the following experimental results were obtained.
1) The greater is the diameter of tube, the greater is the velocity of burning.
2) The burnt figures with the open-end-pipes and the closed-end-pipes represent remarkable difference.
3) There is a difference in the burnt figures, according to whether the pipes were laid along the inclination of the slope or perpendicularly to it.
4) The deepest point of the burnt down space is situated at the lower or upper side of the ignition point according to the condition, and its distance from the ignition point become maximum when the pipe diameter is nearly 10mm.
5) When the angle of inclination of plane was varied, the velocity of propagation decreased at first and after attaining critical value it began to increase on the contrary.View full abstractDownload PDF (194K) -
Tomio IZUMI, Takakage SAKURAI, Toshio IZUMI1956 Volume 5 Issue 3 Pages 87-91
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSExperiments were performed in laboratories for a range of rates of water 1.4, 2.8 and 5.6l/min/m2(called respectively low, medium and high rates),of wind velocities 0, 3, 4 and 5m/sec and of expansion factors of foam 7, 10 and 15 (called respectively low, medium and high expansion factors), with hydrolyzed protein compound.
The results were as follows :
(1) No appreciable effect of wind pressure on the rate of coverage was observed, when wind velocity being 3 and 4 m/sec. When wind of 5m/sec, that effect was markedly.
(2) Under wind of 5m/sec, there was appreciable effect of wind pressure on the low expansion foams at the low water rate, and on the high expansion foams at the high water rate.
(3) The rate of coverage of high expansion foams under wind of 5m/sec was almost the same as the rate of that condition, in which there is no wind and the water rate the half.View full abstractDownload PDF (394K) -
Shunsaku NAKAUCHI, Ujiro TSUTSUI1956 Volume 5 Issue 3 Pages 92-97
Published: 1956
Released on J-STAGE: February 25, 2015
JOURNAL FREE ACCESSThe behavior of a pneumatic tube type fire detector for known values of temperature rise, given to a part of the tube, was analysed mathematically.
The theoretical equations to calculate the pressure rise in the diaphragm chamber when the temperature of pneumatic tube was raised abruptly, linearly or exponentially with the time, were deduced.
The theories were also checked by experiments, and the difference between the calculated and observed values was found to be negligibly small.
The calculation by the theoretical equation is comparatively simple and the theory is considered very useful for designing and testing the fire detector.View full abstractDownload PDF (566K)
- |<
- <
- 1
- >
- >|