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Operator-inspired features in new Pneumajector
Page 47
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• Increased ground clearance when tipped is a special . feature of the Pneumajector Mk VIII tip and-blow powder tanker that was designed by Freight Bonallack Ltd, Basildon, Essex, in close liaison with the operator, Ketton Portland Cement Ltd.
This has been achieved by replacing the original coned end with a dished end, and improvements have been incorporated in the design that enable the favourable flow characteristics of the coned-end type to be retained. A guide, plate is welded to the interior of the tank at the rear end on each side of the aeration pad to funnel the cement into the pad and to blank off small spaces in the barrel where the cement can stick.
Other improvements include the provision of a non-return valve in the boost line between the product-discharge and air-supply pipes which prevents cement being blown back into the air-supply pipe by silo back pressure and clogging of the aeration pad. This is made of a cotton /Terylene material and has a weather strip around the flange that obviates water soakage through the edge fibres.
Protection against blow-back of cement when the discharge hose is disconnected from the silo is provided by an external pipe located between the top of the tank to a pressure relief valve at the rear. Excess air can be blown off before the driver disconnects the tanker from the silo.
Four Pneumajector Mk VIII tankers, employed by the Ketton company, are based on ERF eight-wheeled rigid chassis with a wheelbase of 16ft 9in. which are plated at 26 tons gvw and can carry a payload of 17 metric tons. The aluminium tank has a capacity of 540 cu ft, and air pressure at 13 psi is provided by a Wellworthy -Ricardo WS5 compressor, driven by the vehicle's Gardner 6LXI3 diesel through a full-power take-off on the David Brown 6-600 gearbox. The tank can be tipped to an angle of 45deg by an Edbro 6CAN twin-ram tipping gear.