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MERC - Boll & Kirch Test Plan
2
2. Introduction to Technology
Even when faced with extreme conditions the BOLL Automatic Filter TYPE 6.18.3 can
deal with it without the risk of malfunctioning. One of the key reasons for this is that the filter is
equipped with ultra robust bipolar filter candles. These are open at both ends and the water to be
filtered flows through the candles from both ends. Due to their length and increased diameter the
filters have a particularly large surface area. A capacity of 3000 m3/h enables single unit
solutions to be used, removing the need for filter batteries that take up a lot of space and are far
more prone to breaking down. The capacity of the backflushing system has been specially
designed to cope with the high filtration capacity of the system. By this, an excessive blocking
of the filter elements is prevented.
The BOLL Automatic Filter TYPE 6.18.3 utilizes the tried and tested bipolar filtration
method in conjunction with an effective bipolar backflushing function. Rotating flushing arms
are fitted both above and below the filter unit. The filter candles are cleaned alternately from
above and below with the filtrate fluid without interrupting filtration.
Due to the high flow speeds that this generates, the filter candles are cleaned particularly
thoroughly. In conjunction with the large quantities of discharge used for cleaning purposes, the
bipolar backflushing method ensures maximum performance at maximum speed.
As well as having all the qualities that you would expect from leading-edge
BOLLFILTER technology the new BOLL Automatic Filter Type 6.18.3 also has some extra
features specifically designed to cater for the special needs of the shipping industry. The filter
housing is made of carbon steel and only
has a small footprint thanks to its compact design.
3. Protocols for Pilot-Scale Evaluations of Ballast Water Filter Systems
Basic Experimental Design:
MERC will evaluate the efficacy of
ballast filtration systems onboard the
MARAD
vessel
M/V
Cape
Washington
while
docked
in
Baltimore Harbor, Maryland (right).
The ballast system of the
Cape
Washington
has been modified to
allow for ballast water at variable
flow rates up to 700 m
3
/hr and
pressures up to 36 psi. A nominal
flow rate of
200 m
3
/hr shall be
delivered to one filtration system at a
pressure
specified
by
the
manufacturer. A detailed drawing of
the modified ship ballast system can
be found on page 9.
It is important to note that protocols will be the same for each system test. However,
tests of different filters will NOT be conducted simultaneously, and MERC will NOT compare