CET Systems

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CET emptying systems can be supplied in both fixed and mobile types.

Mobile systems are normally mounted onto a carrier vehicle due to their size and weight.  Mobile units are ideal for occasional emptying duties or where the number of vehicles and toilet tanks are limited.  The advantages of mobile sand filling are that the emptying location can be flexible and not dependent on fixed CET station locations.  The disadvantages are that the mobile system takes time to move to the emptying location and must itself be emptied at intervals.  Additionally, all emptying locations must be accessible for the mobile unit, meaning hard standing routes are needed in the working areas.

Fixed CET systems comprise a central vacuum pump and a network of pies to individual emptying stations located on service aprons.  Often, this service requirement can be integrated onto combined aprons with sand feeding and water filling functions.  The fixed CET stations vary in complexity and comprise a suction hose and then optional water filling, tank rinsing and chemical dosing hoses.  The CET stations can incorporate manually operated valves, or can be full automatic if required, allowing the operators to work more quickly and efficiently.

The central vacuum pump comprises a vessel held at negative pressure that sucks the effluent from the CET tank on the rail vehicle.  This tank is then purged to sewer with compressed air.  By using this type of technology, the effluent does not come into contact with the mechanical pump and so wear and blockages are limited.

The pure vacuum pump also has the advantage that full vacuum is available from the start of the emptying cycle without the need for a mechanical pump to prime itself to develop the suction.  The same applies at the end of the tank emptying, when the pure vacuum pump maintains performance while the mechanical pump loses suction as the effluent volume decreases at the bottom of the tank.  Overall, this means a faster tank emptying time than with a mechanical pump and more complete emptying of the CET tank on the train.

You can visit the NEU Railways web site here.

The Stats

Fixed or mobile equipment

Efficient over long distances

Low maintenance design

Fast CET tank emptying

Fully automatic option

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Bombardier has unveiled its next generation Flexity 2 tram to the world for use at the Starr Gate Depot in Blackpool.  Depot Rail have supplied and commissioned a set of 12 Eurogamma vehicle lifting jacks for the new trams and supplied the sand feeding system. During January 2012 Depot Rail delivered a Zephir Crab 1500E which is a battery operated shunting vehicle which will be used to move the new trams at the Starr Gate Depot.