Tank suitable for holding liquids

A tank suitable for holding a liquid comprising first and second baffles adapted to divide the interior of said tank into first, second and third series interconnected chambers, each adapted to contain said liquid, and inlet adapted to supply a mixture of a gas and said liquid to said first chamber, an outlet adapted to withdraw said liquid from said third chamber and venting means having an outlet through which said gas present in said first chamber is vented, said baffles being so adapted and arranged that when said tank is in its normal spacial disposition, liquid supplied in operation to said first chamber flows into said third chamber via said second chamber, and if said tank subsequently adopts a spacial position other than said normal spacial disposition, the flow of liquid from said third chamber to said second chamber is prevented or is of a sufficiently low level that an adequate quantity of liquid is retained within said third chamber to provide a continuity of liquid flow through said outlet for a finite time period and unsufficient liquid flows from said second chamber into said first chamber to obstruct said venting means.