Abstract of RIIS Report ( SH-1956-2 )

National Institute of Occupational Safety and Health, Japan

Research of Ventilation in Plant (1st Report)

SH-1956-2-1

E.Akiyama, T.Kondo, S.Tonsho

: One of the methods to eliminate explosion hazards is to use a ventilating system. The amount of air required is expressed by the number of air change per hour. But it does not show the exact efficiency. The efficiency is effected by many physical conditions.
We made many experiments on ventilation and studied air movement. We knew that air pattern is very different by the difference between indoor and outdoor temperature, and it is necessary to determine the proper position of hoods and openings to obtain the good system.

Corrosion of Wire Rope by the Sea Water

SH-1956-2-2

E.Akiyama, T.Kondo, T.Hakamazuka

: The corrosion is one of the most principal causes of the wire rope failure, from which a lot of accident occurred. On the field tests, we investigated the relation of wire rope strength with their corrosion by the sea water. We confirmed that the zinc galvanized rope is superior to the bared rope from the viewpoint of the corrosion, and the rope made of fine wires is more easily influenced than the one made of thick wires, beyond the ratio of their surface area. We found that the tensile strength of corroded rope is not proportional to the residue sectional area. We suggested the time to abandon the corroded rope, which was placed under the sea level or at the half tide level.

The Form of the Coupling Chain, the Limited Weight of a Torolly and the Allowable Limit of Elongation of such a Chain (3rd Report)

SH-1956-2-3

Gisei Mori, Kozen Hirai

: On this report the theory and its conclusion are described in order to decide the rational form of coupling chains of trollies, the limited weight of a trolly and the allowable limit of elongation of such chains.
  1. The impact load for the chain to couple trollies in practice was calculated theoretically from the results obtained on the impact loading tests of chains as described on the first report.
  2. The allowable load for the chain was decided from the results obtained on the static loading tests of chains as described on the second report.
  3. In addition to these decisions considering the economical and practical factors, the form of the link of chain was decided as follows;
    l ₁ = 4.6 d and l ₂ = 5.6 d
    , where l ₁ : the width of a link, l ₂ : the length of a link and d: the diameterof material.
  4. When 3 link are used as the chain to pull 5 to 10 trollies, the weight of a trolly should be limited less than following value.
    W = 90 d ³
   , where W : the limited weight of a trolly in kg when loaded and d : the diameter of material in cm,
  5. The allowable limit of elongation of such chains should be 10 % of their initial length.    (The end)

JNIOSH

Abstract of RIIS Report ( SH-1956-2 )

National Institute of Occupational Safety and Health, Japan

Research of Ventilation in Plant (1st Report)

Corrosion of Wire Rope by the Sea Water

The Form of the Coupling Chain, the Limited Weight of a Torolly and the Allowable Limit of Elongation of such a Chain (3rd Report)

Other Publications