Receptacles – Arrangements of plural receptacles – Receptacle having rigid – removable inner container
Patent
1987-06-23
1989-01-10
Moy, Joseph Man-Fu
Receptacles
Arrangements of plural receptacles
Receptacle having rigid, removable inner container
220 85S, B65D 124
Patent
active
047967730
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a transport tank for transporting liquids which comprises a manhole and slosh guard elements in its interior. Such a tank may be either a self-contained transport tank container or part of a tank truck.
There is a general tendency towards constructing transport tanks of maximum size, and for 20-foot containers the upper limit currently is at a capacity of c.27 m.sup.3 for an ISO-standardized length of about 6 m. On the other hand, the permissible total weight of such transport tanks is somewhat in excess of 300 kN. When a large tank is loaded with heavy liquids, this weight limit is reached already when the tank is partially filled. Since there occur considerable eccentricities of the centre of gravity during the transport of partially filled tanks due to decelerations and while negotiating bends, international rules require that a transport tank for transporting liquids, when filled to less than 80%, must be provided with slosh guard plates, wherein 70% of the cross-sectional area of the tank should be slosh-protected, though this value of 70% has not been sufficiently substantiated either empirically or by calculation.
In the journal "Maschinenmarkt - europa industrie revue" 3-70, pp. 20-22, Gerhard Krause deals with road tank trucks for transporting dangerous goods and presents a tank in said essay which is provided in its interior with slosh guard plates extending transversely and longitudinally. These slosh guard plates are fixedly welded into the tank while the tank is being manufactured. Since columns of liquid act dynamically on either side in longitudinal and transverse directions, the plates themselves and their mounting to the inner wall circumference must be stable and fatigue-proof. Due to the fact that the slosh forces occur by jerks and jolts, long twin fillet welds are required which cover the tank circumference either completely or to a major extent. On the other hand, openings are necessary in the top and bottom regions of the slosh guard plates for deaerating and completely emptying the tank. Expensive reinforcing plates must be provided at the terminal points of said openings in order to reduce peak stresses occurring thereat. Furthermore, it is not every tank compartment formed by slosh guard plates that is provided with a manhole, and a larger entry port is respectively required to allow the carrying-out of inspection and cleaning work. Therefore, structures of this type having fixedly welded slosh guard plates are expensive to manufacture, hinder cleaning work, increase the tare weight of the transport tank, and exhibit considerable risks of fatigue and resulting leakage. Apart from these facts, fixedly built-in slosh guard plates only make sense when it can be predicted that the tank will again and again be transported with a partial load.
The invention is based on the object of providing a transport tank for transporting liquids, comprising slosh guard elements which are highly efficient for damping slosh forces occurring in longitudinal, transverse and vertical directions, do not require fixed parts in the tank interior, permit easy cleaning of the tank and allow the provision of similar tanks, especially those of very large capacity, which permit the transport of light liquids without any unnecessary tare weight, on the one hand, and also permit the transport of heavy liquids without the risk of unacceptable eccentricites of centre of gravity, on the other hand.
The solution of this object in accordance with the invention comprises dimensioning the slosh guard elements such that they can be introduced through the manhole and be detachably secured in the tank. Accordingly, the transport tank comprises a concept in which the slosh guard elements can be assembled, if required, in the finished tank and can also be removed therefrom. The slosh guard elements and retaining means are dimensioned so that they may be introduced into the tank interior through the manhole either with or without elastic deformation and may be assembled therein. Neither fixed parts nor
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"Maschinenmarkt-Europa Industrie Revue", 3-70, pp. 20-22, by Gerhard Krause.
Man-Fu Moy Joseph
Westerwaelder Eisenwerk Gerhard GmbH
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