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MARPOL Annex VI Quick Guide On IAPP And EIAPP certificates

EIAPP and IAPP guide

The MARPOL Annex VI 2009 edition, elaborate more on the IAPP and EIAPP certificates. Following the quick guide issued by the DUV, the DVU has experienced an increase in class inquiries related to requirements for NOx emissions from marine diesel engines and that of the ship.

Furthermore, in this article, we are to discuss and guide more about the difference between the IAPP and EIAPP certificates.  This question normally fails most seafarers in a job interview.

What is the full meaning of IAPP and EIAPP?

You might know the full meaning of the above abbreviations, but to help those who have no idea;

IAPP –  International Air Pollution Prevention

EIAPP – Engine International Air Pollution Prevention

what is the main objective of IAPP and EIAPP?

The IAPP certificate maintains the MARPOL roles against atmospheric pollution from vessels. since the ships have other means of pollution the air apart from the main engine, the certificate is issued to ships that comply with the roles.  Also, the EIAPP Certificate is the main engine Air Pollution Prevention Certificate which relates to NOx emissions. This certificate only released to the marine engine which certified to the roles.

EIAPP and IAPP guide
MARPOL Annex VI guide on IAPP and EIAPP – Image by SlideShare all rights reserves


In general, the IAPP is for the ship ( air pollution) and EIAPP is for Engine ( NOx air pollution). Having known that, let’s discuss on the EIAPP emission requirements;

As you may know, there are three levels of allowable NOx emissions from marine diesel engines, depending on the ship’s keel laying date and when the engine was installed.

a) Tier I  – applicable from 1st January 2000 years

b) Tier II – applicable from 1st January 2011

c) Tier III – applicable from 1st January 2016

To read full details about the above regulations, I recommend you see the reg. 13, parts 35

With the above regulation, before planning to replace or modify your vessel engine, the owner needs to evaluate whether the action will influence the EIAPP certificate of the engine in question. Same goes for modifying or installing additional IAPP covered equipment, the ship management and the owner need to check for a proper guide.

What are the major conversions under the EIAPP?

There are three scenarios which define a major conversion, let’s take for  example of a conversion of a diesel engine which was installed on or after the year 2000;

a) The maximum continuous ratings are increased above 10% compared to the initial certificate.

b)Installation of a replacement engine which is not a type identical to the one it is replacing, or the installation of an additional engine

c) For engine installed on board ships constructed on or after January 2000, a substantial modification could be made. This means any modification that can cause the engine to exceed the applicable emission limit.  Read more on MARPOL Annex VI – Summary of requirements or you may also like to learn more about Initial Survey for MARPOL 73/78 ANNEX VI (Regulations for the prevention of air pollution from ships).

Marine and offshore insight team, we are here to share useful knowledge to help the marine professionals and the beginners, therefore if you have question base on the topic or other related maritime questions, feel free to contact us or drop your comment to have more guide from others.

We hope this quick guide will be helpful to our reader.  Like the article, share with your friends.

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MARPOL – Frequently Asked Questions and Answers

Take MARPOL 73/78 Convention quiz here

Marpol 73 and 78

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