Cricket filter

Control of the back-pressure level required for efllbctive back-flushing has bear claimed with the use of flat perforated plate elements in the Cricket filter [Filtration and Separation, Sep/Oct., 1991]. Automatic, semicontinuous cleaning of tubular candle filters can also be realised by momentary reversal of the filtrate flow a resulting bump is defivered to the cake, which is dModged and Ds to the cone-shaped bottom of the unit, Bgure 11.53. The effectiveness of these filters is inproved by the use of filter media whkh can handle veiy dilute suspensions of fine (< 0.5 pm) particles, e.g. PIPE membranes). 

A filter that resembles a candle filter is the Cricket filter (from Amafilter), which is so-named because the elements, rather than being cylindrical, are flattened so as to resemble a cricket bat in shape. Each element was suspended from a filtrate collection manifold to which was connected an internal filtrate pipe rising from the bottom of the element. The small volume of each element and the flat surface ensmed complete cake removal during blow-back. 

Several chambers are now available that will allow the enclosed detonation of both high-explosive and chemical rounds. Although shell size is currently limited to 220 mm, the chambers are useful for areas where as is where is detonation is impossible. Some are designed with filter banks specifically for chemical munitions. Those intended for explosive shells can still be equipped with charcoal filter banks to handle the explosive toxic residue, as well as the misclassified CWM shell. A cricket cage can be installed at the end to insure that no toxics make it through the filters. 

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