4.1.1 General
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Options under Scheme A of these Guidelines provide for:
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a) Unit approval;
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b) Serially manufactured units;
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c) Production range approval.
4.1.2.1 An EGC unit should be certified as capable
of meeting the limit value, (the Certified Value), specified by the
manufacturer (e.g., the emission level the unit is capable of achieving
on a continuous basis) with fuel oils of the manufacturer’s
specified maximum % m/m sulphur content and for the range of operating
parameters, as listed in 4.2.2.1(b), for which they are to be approved.
The Certified Value should at least be suitable for ship operations
under requirements given by MARPOL Annex VI regulations 14.1 and/or
14.4.
4.1.2.2 Where testing is not to be undertaken
with fuel oils of the manufacturer’s specified maximum % m/m
sulphur content, the use of two test fuels with a lower % m/m sulphur
content is permitted. The two fuels selected should have a difference
in % m/m sulphur content sufficient to demonstrate the operational
behaviour of the EGC unit and to demonstrate that the Certified Value
can be met if the EGC unit were to be operated with a fuel of the
manufacturer’s specified maximum % m/m sulphur content. In such
cases a minimum of two tests, in accordance with section 4.3 as appropriate,
should be performed. These need not be sequential and could be undertaken
on two different, but identical, EGC units.
4.1.2.3 The maximum and, if applicable, minimum
exhaust gas mass flow rate of the unit should be stated. The effect
of variation of the other parameters defined in 4.2.2.1(b) should
be justified by the equipment manufacturer. The effect of variations
in these factors should be assessed by testing or otherwise as appropriate.
No variation in these factors, or combination of variations in these
factors, should be such that the emission value of the EGC unit would
be in excess of the Certified Value.
4.1.2.4 Data obtained in accordance with this
section should be submitted to the Administration for approval together
with the ETM-A.
4.1.3 Serially manufactured units
In the case of nominally similar EGC units of the same mass
flow ratings as that certified under 4.1.2, and to avoid the testing
of each EGC unit, the equipment manufacturer may submit, for acceptance
by the Administration, a conformity of production arrangement. The
certification of each EGC unit under this arrangement should be subject
to such surveys that the Administration may consider necessary as
to assure that each EGC unit has an emission value of not more than
the Certified Value when operated in accordance with the parameters
defined in 4.2.2.1(b).
4.1.4 Product range approval
4.1.4.1 In the case of an EGC unit of the same
design, but of different maximum exhaust gas mass flow capacities,
the Administration may accept, in lieu of tests on an EGC unit of
all capacities in accordance with section 4.1.2, tests of EGC systems
of three different capacities provided that the three tests are performed
at intervals including the highest, lowest and one intermediate capacity
rating within the range.
4.1.4.2 Where there are significant differences
in the design of EGC units of different capacities, this procedure
should not be applied unless it can be shown, to the satisfaction
of the Administration, that in practice those differences do not materially
alter the performance between the various EGC unit types.
4.1.4.3 For EGC units of different capacities,
the sensitivity to variations in the type of combustion machinery
to which they are fitted should be detailed together with sensitivity
to the variations in the parameters listed in 4.2.2.1(b). This should
be on the basis of testing, or other data as appropriate.
4.1.4.4 The effect of changes of EGC unit capacity
on washwater characteristics should be detailed.
4.1.4.5 All supporting data obtained in accordance
with this section, together with the ETM-A for each capacity unit,
should be submitted to the Administration for approval.