What is Mobrey?
Mobrey is the name used for the Automatic water level controller; it comes under the category of mountings and fittings of Steam Boiler Assembly. As the name suggests, it is used for maintaining the water level in the Boiler shell.
Mobrey is mostly used in smoke tube steam boilers not in water tube boilers,
as the shell diameter of the former is greater than that of latter
irrespective of their running capacities and working pressures.
For
smoke tube boilers, mobrey is fitted externally on the nozzles coming
out of the steam boiler shell curvature. It consists of a hollow
cylindrical unit in which a float hangs. So, when the feed pump works,
it supplies feed water to the boiler shell and it gets filled up. From
those nozzles, the water also enters the hollow cylindrical pipe of the
mobrey, as a result, the float goes up.
Now during the operation
of the Steam Boiler, the water gets heated up and gets converted to
steam. Meanwhile, the water level, because of this steam generation, the
water level in the Steam Boiler shell goes down and along with it, the
float of the mobrey also comes down.
After certain distance being
covered by the float, mobrey sends an electrical signal to the
electrical panel and then panel starts the feed pumps to overcome this
shortage and the float goes up again after refilling. This system on
which on which the mobrey and feed pumps in coordination are also known
as the Cascade Control System.
In a Cascade Control System, it
uses the output of the primary controller to manipulate the output of
the secondary controller, as the output of the secondary controller is
the desired one. Here the primary controller is the mobrey and the
secondary controller is the feed pump.
Mobrey ensures the desired
quantity of the water to be maintained in the Steam Boiler Shell and
also enhances the overall safety of the Boiler during operation by
minimizing the manual intervention.
Thermodyne Boilers had supplied and installed successfully these automatic water level controllers to all our clients.
source-www.thermodyneboilers.com
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