FAN ANTI SURGE CONTROL

www.vtk.nlsales@vtk.nlP: +31 251 279900

VTK SiccaDaniaGooiland 8 1948 RC BeverwijkThe Netherlands

• CIP equipment for both chambers

• Suitable for ATEX zone 2

• Glass connection to the Distributed control system

• Remote controlling

• Flow transmitters

• Pressure transmitters

• Temperature transmitters

• Control valves

• Condition monitoring of bearings

FAN ANTI SURGE CONTROLWhen a fan system is delivering air into a large silo the pressure in that silo will increase slowly and the flow of air to the silo will decrease.

At a certain moment the fan will not be able to deliver the required pressure to transport more air into the silo; in fact the fan will surge and the air flow direction will reverse.

The silo pressure will decrease until the fan recovers and the process will start all over again. This phenomenon is called surging.

Surging does interrupt your process e.g. drying, heating, cooling or transporting.

Surging will cause a dramatic increase in noise and vibration. This will, in time, result in structural fatigue damage to your fan.

Life of bearing, main shaft, hub, impeller, coupling and motor will be dramatically reduced and your fan process will be interrupted.

SURGING SYMPTOMS

SPECIFICATIONS

Air flow, pressure and temperature are measured, these conditions are converted to standard conditions and compared to the surge characteristics of the fan by an advanced algorithm.

Then the flow through the fan starts to reduce and reaches a critical surge point the Anti Surge Controller will open a bypass or blow-off valve to ensure the minimum required flow. The fan is now protected and the process is not interrupted.

The PLC control algorithm not only calculates with the mentioned flow, pressures and temperatures but also takes the molecular weight and polytrophic exponent of the gas into account. The fan characteristics are also entered. All measured and calculated data is presented on the colour display.

HOW DOES IT WORK:

The ASC is suitable for backward curved centrifugal fans or blowers with 1, 2 or 3 compression stages.SUITABLE FANS

The ASC panel works as a standalone unit. Connection to a DCS is not required. STANDALONE OPERATIONS

AVAILABLE OPTIONS