Alfa Laval Toftejorg TZ-67, Инструкция по эксплуатации

Страница: 10 / 46

4 Installation
TZ-67
4.1 General description
The Toftejorg TZ-67 is a media driven and media lubricated tank cleaning machine. As it is self lubricating, there is no lubricating
substances such as oil grease etc. in the machine which needs to be regularly changed.
For use in explosive hazard zones the ATEX/IECEx version can be used, provided it is installed according to safety instructions
in local regulations.
4.2 Functioning
The flow of the cleaning fluid passes through a guide and a turbine, which accordingly is set into rotation. The turbine
rotation is through a gearbox transformed into a combined horizontal rotation of the machine body and a vertical rotation of
the nozzles.
The combined motion of the machine body and the nozzles ensures a fully indexed tank cleaning coverage. After 5 5/8
revolutions of the Hub with nozzles (5 3/8 revolutions of the machine body) one coarse cleaning pattern is laid out on the
tank surface. During the following rounds, this pattern is repeated 7 times, each of which is displaced 1/8 of the mesh in
the pattern. After a total of 45 revolutions of Hub with nozzles (43 revolutions of the machine body), a complete cleaning
pattern has been laid out, and the first pattern is repeated.
First cycle Full pattern
The speed of rotation of the turbine depends on the flow rate through the machine. The higher the flow rate the higher the
speed of rotation will be. In order to control the RPM of the machine for a wide range of flow rates, the efficiency of the
turbine can be changed (100% and 0% Turbine/Inlet guide).
Apart from the jet flow through the nozzles, fluid is leaking through the top of the machine, at the hub and through the bottom
cover. The leakage between the moving parts at the top and at the hub are cleaning the gabs and thus preventing build-up
of material that might cause the friction. The flow through the bottom cover is due to the fact that the machine is media
lubricated and that accordingly a flow through the gearbox is needed.
10