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Cement in Bulk for New Zealand
Page 102
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• British Concern Wins Orders in Face of World Competition
A BRITISH concern specializing in rx pressurized bulk delivery of cement to building sites, and in storage apparatus for bulk cement, has entered the New Zealand market in face of world competition.
Interest in pressurized. delivery . of cement in New Zealand was aroused by Portasilo. Ltd.'s agents and led to the State Railway investigating , systems employed in various countries.
After tests by New Zealand engineers. the seven-year-old York. company of Portasilo, Ltd:, has been given, an extensive contract. Orders have been placed for its system of haulage tanks and portable silos and weighing equipment from the State Railway, leading cement companies, and the building industry of New Zealand. The complete scheme provides for tanks for both rail and road, and silos for the storage and handling of cement on sites.
Flexibility of the system is one of its main advantages, as it does not entail the provision of special rail wagons, and can be used by road, rail or water transport. Portasilo's New Zealand rail tanks carry their own compressor units and can be transported on a normal railway wagon and rapidly transferred to a road vehicle. The road tanks, which can be mounted on a wide range of chassis, take power for compressor units from an engine take-off.
The tanks arc made to carry seven, eight or nine tons of bulk cement and are so constructed that they can be mounted either singly or in multiple units. Orders for 86 rail and 'road tanks for New Zealand are now in hand, and arrangements have been made for manufacture under licence in New Zealand together with the production of silos for storing the cement.
The development of the Portasilo range of equipment is, of course, based on the fact that when a powder such as cement is mixed with compressed air, the powder takes on the properties of a fluid, and can then flow along pipes and can be controlled by the adjustment of air pressure.
Except for a few large building and civil engineering sites, all cement in Great Britain was transported and stored in bags until 1953, when the first Portasilo was put into production. In seven years the delivery and storage of cement in Britain has been revolutionized. Standard Portasilos are now made in capacities of 11, 15 and 30 tons and are familiar on construction sites throughout Britain. Silos have also been developed for handling bulk salt, flour, lime and whiting powder.
The New Zealand application involves the mounting on a suitable flat rail wagon of four steel Portasilo units, each of 188+ cu. ft. capacity, with a compressor unit mounted centrally. The compressor consists of a Wellworthy Ricardo positive displacement compressor driven by a Ford industrial petrol engine. This arrangement enables the cement to be discharged into silos and into road tankers,