Hydraulic and earth engineering – Fluid control – treatment – or containment – Floatable matter containment
Patent
1990-06-07
1991-02-19
Corbin, David H.
Hydraulic and earth engineering
Fluid control, treatment, or containment
Floatable matter containment
405 70, 405 72, E02B 1506
Patent
active
049938711
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an oil catching boom which comprises an upper part in the form of a flexible hose, floating on the surface of water, and a skirt, attached under it, extending downwards over a certain distance into the water, the upper part of the boom being made up of an outer hose of a fabric-like material and an inflatable inner hose placed inside it.
Such an oil catching boom is known, for example, from DE application publication 27 28 291. Often the boom is built up of successive segments so that it will be more flexible and can adapt to sea swell without oil escaping over the boom or under the skirt of the boom. Often the lower edge of the skirt is provided with weights so that it remains continuously vertical despite sea swell, for example. Booms intended for calmer waters are in general made straight and continuous, since the flexible structure is, of course, more complicated and more expensive.
The object of the present invention is to provide an oil catching boom which has a very simple construction and can be used either in a substantially straight form in calm waters or in a flexible form in open-sea conditions. To achieve this object, the invention is characterized in that the inner hose is provided at certain intervals with strictures to increase its flexibility. The strictures are produced, for example, by means of throttling rings, placed at certain intervals around the inner hose, the rings being preferably of a band-like material.
The invention and its other characteristics and advantages are described below in the form of an example and with reference to the accompanying drawing, in which
FIG. 1. depicts a side view of the principal part of a boom according to the invention,
FIG. 2 depicts an end view of the same principal part,
FIG. 3 depicts a side view of the inner boom,
FIG. 4 depicts an end view of the inner boom,
FIG. 5 depicts a side view, in part in section, of a boom according to the invention,
FIG. 6 depicts a top view of the boom according to FIG. 5, and
FIG. 7 depicts a perspective view, more complete, of a boom according to the invention.
In the figures, reference numeral 1 indicates the upper part of the boom. This part is of some suitable oil-resistant fabric-like material. When the boom is not in use, part 1 can thus be completely deflated, although in FIGS. 1 and 2 it is shown as having a circular cross section.
To the upper part 1 there is attached by a longitudinal seam 2 a skirt 3, extending directly downwards, to the lower edge of which there is attached, also by a seam 4, a hose-like edge 5. Inside this hose-like edge there is a weight which keeps the skirt vertical and, in the form depicted, comprises several weights 6 placed inside the lower hose 5 and interconnected with a rope 7.
The upper part of the boom includes the inner hose 8, depicted in FIG. 3, which is closed by a seam 9 at each end and provided with at least one nipple 10 for inflation. This inner hose is designed to be placed inside the flexible outer hose 1 of the boom and is dimensioned so that, when inflated, it fills the outer hose 1.
Because of the inner hose 8, the boom can be conveniently arranged to bend like a segment without the "articulation points" between the segments causing a risk of leakage. It is, of course, possible to provide the inner hose 8 in advance with strictures, but in practice it is much simpler to produce the strictures, for example, by means of throttling rings 11 placed around a uniform hose 8 and made of a flexible band material, as outlined in FIG. 5. This additionally results in the advantage that the length of the segments, in other words, the distance between the throttling rings 11, can be adjusted according to need at any given time. In calm waters, an inner hose 8 completely without strictures can be used. The number of strictures, as well as the degree to which the hose has been inflated, of course determine the properties and floating depth of the boom. In FIG. 6, water surface is indicated by reference numeral 12.
FIG. 7 finally is a perspectiv
REFERENCES:
patent: 3237414 (1966-03-01), Straub et al.
patent: 3576108 (1971-04-01), Rowland
patent: 3685297 (1972-08-01), Juodis et al.
patent: 3792589 (1974-02-01), Sayles
patent: 4104884 (1978-08-01), Preuss
Corbin David H.
Oy Lars Lundin Patent Ab
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