MEPC.398(83) in force since 1 September 2026
After a substantial modification, an installed engine has to prove compliance onboard. We measure the engine, help make it better and document the result, from the first talk with class to the approved Technical File.
Discuss your projectFind your service
Click what fits your project. The answer shows on the right.
1Click what fits your project
Why ME-Tech
A measurement tells you where the engine is. We help you get it where it should be.
Many can bring an analyzer onboard, take the readings and leave. We stay in the process from the first idea to the signed file, in close collaboration with the engine designer’s development engineers, the owner, the crew and class. Our understanding of engine performance supports their work, so together we get the very best out of your engine, within the rules.
01This is where we make the difference. We read the engine, its settings, its limits and its potential, and measure while it runs. From the measured data we adjust and optimise the engine on the spot, in close collaboration with your engineers, until it performs at its best within the limits.
02NOx, CO, CO2, O2, THC, methane slip, N2O and PM, onboard or at your test bed. Our equipment is calibrated to NTC 2008, with calibration gases from accredited suppliers, so the data is solid enough to tune the engine on and to put in front of class.
03NTC 2008, MEPC.398(83), MEPC.414(84), EPA and EU. We know the route before the test starts, agree the test plan with class early, and prepare survey-ready documentation that we follow until the last document is signed.
Optimised. Measured. Certified. Your engine at its best, and a result that holds at survey.
Talk to usWhat we do
Your retrofit certified and compliant from day one, with measurements onboard or at your test bed.
Emission data that stands up to class approval, to IMO NTC 2008, ISO 8178 and EPA 40 CFR Part 1042 and 1065.
Guidance on IMO and EPA rules before the scope is fixed, when it saves the most time and cost.
Accurate emission test equipment for every survey, calibrated onboard or as laboratory calibration with certified gases.
Methane and N2O reporting
MEPC.414(84) and the EU ETS, which has covered methane and N2O since 1 January 2026, put methane slip on the agenda for LNG dual-fuel vessels.
We measure onboard at several loads with the reference method, and show what your vessel actually emits across its load range.
The results go into one file that the Administration verifies, and a Statement of emission values is issued.
A certified actual value can replace the FuelEU default for the engine type, subject to the applicable certification, verification and requirements. The result follows your vessel’s operating profile, and for some profiles that can be an advantage.
Latest
New rule: MEPC.398(83)
Not measure and hope, but a known result built in from day one.
Proven on retrofit projects, on two-stroke and four-stroke engines.
We have completed the new MEPC.398(83) route, among the first for a Tier change.
Talk to usMEPC.398(83), in force since 1 September 2026, closes a gap in NTC 2008: a defined route for certifying an installed engine after a substantial modification, or when it is brought to a Tier it did not hold at installation. The test plan has to be agreed before the test is scheduled.
After the modification the engine has moved off its certified baseline, and there is no test bed to return to. Compliance has to be shown where the engine runs, with measurements that stand up to survey.
For engine builders, designers, owners and managers: bring the measurement and certification scope in from the start, and the outcome is known before the vessel returns to service, not discovered at survey. Talk to us before the scope is fixed.
Amendment and Technical File
Six steps from first talk to approved file. We plan, measure and document, and we follow the file until class has signed, so you can focus on the conversion.
We agree scope and requirements with your classification society before anything is planned.
A project description and a test plan with the measurement points, load points and any deviation from the test cycle, agreed through class before the test is scheduled.
We prepare the vessel and the test setup, and calibrate all equipment to NTC 2008.
Together with your engineers, we evaluate which measures suit your engine and operation, measure before and after, and set the engine up for fuel efficiency within the emission limits.
Measured onboard or at your test bed, witnessed by the class surveyor. We calculate the NOx and cycle values.
Witness report, calibration sheets, emission calculations and the amendment or Technical File, fully documented. We follow it until class has signed.
Projects
A two-stroke dual-fuel engine retrofitted with variable compression ratio, measured onboard and approved by amendment.
Read the caseTier II and Tier III with SCR in diesel mode, and methanol added in both Tiers.
Read the caseFour-stroke Tier I engines, optimised with new turbocharger matching and timing.
Read the caseTier change from Tier I to Tier III with SCR, certified to Scheme B.
Read the caseTurbocharger cut-out on a two-stroke engine in service, measured onboard and documented for EPA.
Read the caseNamed in the public report as responsible for the PM measurements, onboard a container ship.
Read the caseJust for fun
Move three levers on a two-stroke engine and watch the flame, NOx, Pmax and fuel react. Find the lowest fuel under the limits.
It is only a game. It shows the principle, and real engines and real limits can differ. The right settings are found by measuring.
ME-Tech onboard
Not just talking efficiency. Actually doing it.
Compliance is proven at the engine, not at a desk. Our technicians bring the equipment, set it up in the engine room and measure under real operating conditions, in port and at sea.
Our team includes emission specialists, marine engineers and onboard technicians, with experience from inside a leading two-stroke engine designer.
Onboard measurements
ME-Tech onboard | At the quayEquipment brought onboard and operated by our technicians.
Measurements agreed with class before we start.
Results documented the way class expects.
Close dialogue with you throughout, because it gives the best result.
Contact
