1 For some parameters, different survey possibilities exist. Any one of the below listed methods may be sufficient to show compliance. Approved by the administration, the ship operator, supported by the engine manufacturer, may choose what method is applicable.
.1 parameter "injection timing"
.1 fuel cam position (individual cam or camshaft if came are not adjustable),
-optional(dependent on desigh): position of a link between the cam and the pump drive,
-optional for sleeve metered pumps: VIT index and cam position or position of the barrel, or
-other sleeve metering device;
.2 start of delivery for certain fuel rack positions (dynamic pressure measurement);
.3 opening of injection valve for certain load points, e.g., using a Hal sensor or acceleration pick-up;
.4 load-dependent operating valve for charge air pressure, combustion peak pressure, charge air temperature, exhaust gas temperature versus graphs showing the correlation with NOx Additionally, it shall be ensured that the compression ration corresponds to the initial certification value (see 1.7);
Note: To assess the actual timing, it is necessary to know the allowable limits for meeting the emission limits or even graphs showing the influence of timing on NOx, based on the test bed NOx measurement results.
.2 parameter "infection nozale"
.1 specification and component identification number
.3 parameter "injection pump"
.1 component identification number (specifying plunger and barrel design)
.4 parameter "fuel cam"
.1 component identification number (specifying shape)
.2 start and end of delivery for a certain fuel rack position (dynamic pressure measurement)
.5 parameter "injection pressure"
.1 only for common rail systems: load-dependent pressure in the rail, graph showing the correlation with anox
.6 parameter "combusiton chamber"
.1 component identification numbers for the cylinder head and piston head
.7 parameter "compression ratio"
.1 check for actual clearance
.2 check for shims in piston rod or connecting rod
.8 parameter "turbo-charger type and build"
.1 model adn specification (identification numbers)
.2 load-dependent charge air pressure, graph showing the correlation with NOx
.9 parameter "charge air cooler, charge air pre-heater"
.1 model and specification
MEPC 39/6/1
ANNEX
Page 73
.2 load-dependent charge air charge air temperature corrected to reference conditions, graph showing the correlation with NOx.
.10 parmeter " valve timing" (only for 4-stroke engines with inlet valve closure before BDC)
.1 cam psition
.2 check actual timing
.11 parameter "water injection" (for assessment: graph showing the influence on NOx)
.1 load-dependent water consumption (monitoring)
.12 parameter "emulsified fuel" (for assessment: graph showing the influence on NOx)
.1 load-dependent fuel rack position (monitoring)
.2 load-dependent water consumption (monitoring)
.13 parameter "exhaust gas recirculation" (for assessment: graph showing the influence on NOx)
.1 load-dependent mass flow of recirculated exhaust gas (monitoring)
.2 CO2 concentration in the mixture of fresh air and recirculated exhaust gas, i.e.,in the "scavenge air" (monitoring)
.3 O2 concentration in the "scavenge air" (monitoring)
.1 load-dependent mass flow of reducing agent (monitoring) and additional periodical spot checks mass flow of reducing agent (monitoring) and additional periodical spot checks on NOx concentration after (SCR) without feedback control, optional NOx measurement (periodical spot checks or monitoring) is useful to show that the SCR efficiency still corresponds to the state at the time of certification regardless of whether the ambient conditions or the fuel quality led to different raw emissions.
