Alfa Laval PureBallast 135 Compact USCG, System Manual

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3.1 Introduction
The control system is used to operate and monitor the PureBallast system. It
also contains functions for setting parameters, saving log files etc.
This chapter describes the control system. It includes general description of
the control system pages, step-by-step instructions and a process description
with detailed information about the components (valves, motors, pumps etc)
involved in each step of respective process.
3.1.1 Preparations and conditions
• Make sure all documentation is available, read and understood before start.
• Both ballast and deballast must be run through PureBallast to fully treat the
water.
• Make sure that the flow is within defined flow range during operation:
• Ballast: 32 – 85 m 3
/h
• Deballast: 17 – 170 m
3
/h
• Stripping: 17 – 170 m 3
/h
• The input flow to the PureBallast system shall be as close as possible to
the flow that has been selected for an operation. This will reduce the stress
and wear of the control valve.
• 0 day or 3 days hold-time : Selection of hold-time should be done before
ballast. The same hold-time setting should then be used for deballast. If
you will deballast in US waters, all water in each tank must be treated using
the same hold-time mode. Hold-time is set in parameter p182 USCG hold-
time.
It is not allowed to mix waters treated using different modes in each tank.
Example: If you intend to deballast using 0 day mode, 0 day mode must be
used during ballast. If a tank will be filled with water treated using a different
mode than the water stored in the tank, the tank should be completely
emptied first (preferably using stripping mode).
Therefore, it is recommended to keep track of which mode the water is
treated for each individual tank. The the ballast water record book should
be used to keep track of treatment mode for the water in the different tanks,
how this should be done shall be stated in the ballast water management
plan.
• During process, the control system requests that vessel valves are opened/
closed. The valves are outside the PureBallast system control. But the
control system needs feedback (opened/closed) during process.
Please note:
• When a ballast or deballast process is started, all valves leading the flow
from the PureBallast via pipe 201 and 309 must be opened.
• When a CIP process is started, valves leading water to pipe 310 and
from pipe 309 must be opened.
200000695-1-EN-GB 40
3 Operating instructions and control system description EN