1 Reference in the Code for Approval of BWMS
1.1 In addition to the definitions given in the BWMS Code, the following
terms are defined: .
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1 Base model is a model of a ballast water management
system that has successfully completed land-based testing as defined in
the BWMS Code.
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.2 Scaled model is the ballast water management system model that
is based on the base model but has been modified to accommodate a higher
or lower capacity.
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.3 Most vulnerable model is the model of a series (i.e. the models
to which the type approval certificate referenced in section 7 will
apply) that is most prone to fail the requirements of the BWMS Code
(safe, environmentally acceptable, practicable and biologically
effective) within its series. This may be the case due to its
specifications in comparison with other models of the series, e.g.
because it provides the lowest tolerance regarding deviations of
internal and/or external parameters. When identifying the least robust
model of the series technical/operational parameters as well as
environmental/water quality parameters and possible deviations should be
taken into consideration.
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.4 Mathematical modelling and/or calculations may include
computational fluid dynamics.
2 Documents to be Submitted
2.1 The following documents should be submitted to the Administration, prior to
performance of testing that may be required as part of the verification of scaled
models:
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.1 test plan for verification of the scaling proposed;
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.2 mathematical modelling and/or calculations demonstrating that any
parameters of the scaled models that would affect system performance are
equivalent to those of the base model;
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.3 validation plan for mathematical modelling and/or calculations;
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.4 identification of operating limitations or System Design Limitations
(SDL) for each scaled model;
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.5 the documentation should identify the key internal and external
performance parameters (e.g. dosage concentration, UV dose, filter flux
density, etc.) required to achieve the system's efficacy, and also
specify the physical/environmental conditions and design parameters that
affect these; and
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.6 documentation and drawings of base and scaled models.
3 Reference in the Procedure
for Approval of Ballast Water Management Systems that make use of Active
Substances (G9)
When scaling from systems that have received Basic and Final Approval from the
Committee according to the Procedure (G9), the manufacturer and the Administration
should ensure that any conditions on Final Approval of the base unit are still met
for the scaled system or systems.
4 Testing
Requirements
4.1 Experimental validation
4.1.1 The mathematical modelling and/or calculations should be experimentally
validated to the satisfaction of the Administration:
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.1 Experimental validation should be suitable for the technology.
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.2 Experimental validation should demonstrate the accuracy of the
mathematical model and/or calculation relative to those parameters that
impact the performance of the technology (see paragraph 2.1.5).
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.3 Experimental validation of the mathematical model and/or calculations
may be undertaken in conjunction with land-based, shipboard or
laboratory testing, as appropriate.
4.1.2 The validation should establish that the mathematical modelling and/or
calculations accurately describes the parameters of all scaled models, including the
largest and smallest models.
4.2 Land-based testing for purposes of scaling
Land-based testing for purposes of scaling may be used, e.g. to validate claims for
the scaled models beyond the tested limitations of the base model.
4.3 Shipboard testing for purposes of scaling
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.1 Shipboard testing for purposes of scaling is intended to demonstrate
the long-term operational robustness, safety and practicability of the
models during normal ship operations.
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.2 The most vulnerable model of a series should be tested according to
the requirements for shipboard tests required by the BWMS Code. This
would then allow for verification testing of the scaling models, as
necessary and appropriate, on the same ship.
3 The model required to be tested under paragraph 4.16 of the BWMS Code may not
necessarily be the most vulnerable model.
4.4 Environmental tests
The results of the environmental tests specified in part 3 of the annex to the BWMS
Code, for each configuration of scaled models, should be provided if required by the
Administration.
4.5 Other tests
Test results from additional laboratory testing or operational tests on-shore or
onboard may be used to demonstrate relevant parameters of scaled models.
5 Reference to BWM.2/CIRC.8
Multiple models (referred to as units in BWM.2/Circ.8) of an approved BWMS installed in parallel fall within the
scope of BWM.2/Circ.8.
6 Reporting
A report on the validation of the mathematical modelling and/or calculations, as well
as any other testing conducted in accordance with scaling, should be submitted to
the Administration. The report should include at least the information identified in
paragraph 2.57 of the annex to the BWMS Code. The Administration should annex this
report to the type approval report submitted to the Organization in accordance with
paragraph 6.10 of the BWMS Code.
7 Issuing of Type Approval Certificate for Systems using Scaled Model
The Type Approval Certificate issued by the Administration should include
configurations of each and every scaled model if the scaling is done according to
these procedures.
8 Application to Existing Type Approvals Involving Scaled Models
Administrations are encouraged to apply this Guidance to systems having received
type approval involving scaled models prior to the adoption of this Guidance to the
greatest extent possible.