The International Council on Combustion Engines

WG Publications



August 17
 

CIMAC WG17 | Position Paper - Gas Engine Aftertreatment Systems



The CIMAC Position Paper ‘Gas Engine Aftertreatement Systems’ has been compiled by the CIMAC WG17 'Gas Engines' members and provides an overview regarding the exhaust aftertreatment... read more

March 17
 

CIMAC WG07 | Guideline - ISO 8217:2017 FAQ



The CIMAC Working Group 7 Fuels has prepared and issued a guideline to provide answers to the questions that may arise with the publication of ISO 8217:2017, the latest specification of... read more

February 16
 

CIMAC WG07 | Guideline on the Interpretation of Marine Fuel Analysis Test Results



This guideline follows on from the CIMAC WG7 guideline No 09:2014 [1] which set out the differences between the ISO 4259 approach and that adopted under MARPOL Annex VI in respect of fuel... read more

December 15
 

CIMAC WG07 | Guideline on Filter Treatment of Residual Fuel Oils



The CIMAC Working Group 7 Fuels has prepared and issued a guideline on filtration of residual fuels. Traditionally, filters have been considered a safeguard for marine engines, however, a more... read more

July 15
 

CIMAC WG17 | Impact of Gas Quality on Gas Engine Performance



This position paper describes how gas engines are influenced by the quality of the gaseous fuel provided. This topic is becoming increasingly important as highly fluctuating renewable energy... read more

June 15
 

CIMAC WG07 | New 0.10% sulphur marine (ECA) fuels



New 0.10% sulphur (S) marine fuels recently introduced in the market offer an economically attractive alternative to conventional distillate fuels such as DMA. Before purchasing a new fuel product,... read more

September 14
 

CIMAC WG07 | Interpretation of Marine Fuel Oil Analysis Test Results with particular reference to Sulphur content



With the introduction of MARPOL Annex VI, the sulphur content of a particular fuel oil is now often the primary factor in assessing whether or not that fuel oil is acceptable for intended use.... read more

May 14
 

CIMAC WG08 | Future Fuel Scenarios and their impact on Lubrication



The purpose of this paper is to consider the various types of fuel, and combinations of fuels, that may be used by marine vessels through to 2025, and then to discuss the potential impacts that... read more

April 14
 

CIMAC WG17 | Methane and Formaldehyde Emissions of Gas Engines



Unburned Methane emissions from gas engines are of concern because of their contribution on global warming. Formaldehyde – a toxic interstage product of the Methane oxidation process –... read more

December 13
 

CIMAC WG17 | Information Concerning the Application of Gas Engines in the Marine Industry



Over the last few years gas-fuelled engines have become more popular also in the marine industry both for on-board power generation and propulsion duties. Whereas the use of gas-fuelled marine... read more

July 13
 

CIMAC WG08 | Relevance of Lubricant Flash Point in Connection with Crankcase Explosions



Crankcase explosion is caused due to the overheating of one of the cylinders in the main machinery space. The consequences of the explosion is severe and it affects the working of other engines.... read more

July 13
 

CIMAC WG07 | Guideline for Ship Owners and Operators on managing Distillate fuels



In the current absence of an officially accepted specification for marine fuel containing more than 0.1% v/v biodiesel, this CIMAC publication provides background information and guidance to... read more

July 13
 

CIMAC WG05 | Influence of Fuel Quality on Black Carbon Emissions



Discussions have started up at IMO about the need and potential for restricting black carbon (BC) emissions in the Arctic region caused by international shipping. Especially regarding switch of... read more

January 13
 

CIMAC WG07 | Guideline for the operation of Marine Engines on low Suphur diesel



This document has been prepared to advise the crew, users, vessel owners, charterers, crew, fuel and lubricant suppliers, equipment manufacturers, and classification societies about the fuel... read more

January 13
 

CIMAC WG07 | Questionnaire



This document intends to collect information about the situations experienced where the Ignition and Combustion properties of the fuel are suspected of having influenced negatively on the... read more

November 12
 

CIMAC WG05 | Emission Calculation Check Guide



On 10 October 2008, the IMO Marine Environment Protection Committee at its 58th session, by Resolution MEPC.177(58), has adopted amendments to the Technical Code on Control of Emission of Nitrogen... read more

November 12
 

CIMAC WG02 | Use of Aluminium and alloys in Engine rooms of Category A



Since many years discussions are ongoing between CIMAC WG2 and the IACS MP with regard to the use of Alu and/or Alu-alloys in engine rooms of category "A". Today, mainly for 4-stroke medium and... read more

November 12
 

CIMAC WG02 | Piping - Tightness of Pipe Connections



The presently available requirements with regard to the tightness of pipe connections for flammable, highly inflammable and potentially explosive media and fluids are clearly requesting tightness.... read more

January 12
 

CIMAC WG05 | Background Information on Black Carbon Emissions



This document provides the background information on black carbon emissions from large marine and stationary diesel engines. It discusses about the need and potential for restricting black carbon... read more

April 11
 

CIMAC WG17 | Transient Response Behaviour of Gas Engines



Recent emission regulations and the trend towards utilization of waste gases and renewable fuels have generated a rising interest in using gas engines in applications where Diesel/HFO engines were... read more

January 11
 

CIMAC WG07 | Fuel Quality Guide - Ignition and Combustion



Current commercial residual fuel specifications cannot reliably predict the ignition and combustion characteristics of a fuel due to lack of a suitable test parameter. They cannot therefore protect... read more

February 10
 

CIMAC WG05 | Requirements for Prime Mover Technique Specific Emission Limits Stationary Reciprocating Engine Plant



This document briefly explains the importance of technique specific emission regulations. Some general features of the stationary engine plant are presented, such as: engine types & fuel... read more

March 09
 

CIMAC WG17 | Position Paper about the Influence of Ambient conditions on Performance of Gas Engines



Ambient conditions depend on the geographical location and may vary with time of the year. The performance of an engine is influenced by the ambient conditions. The most important ambient... read more

December 08
 

CIMAC WG17 | Position Paper about the Influence on NOx emissions of NH3 in the fuel gas



This paper discusses some of the issues associated with ammonia content of gas engine fuel. It explains how ammonia is a strong driver in NOx production in the engine opeartion,reasons for ammonia... read more

December 08
 

CIMAC WG17 | Position Paper about the use of LNG as Engine fuel



LNG, liquefied natural gas, is natural gas cooled down to about –161 °C at atmospheric pressure and transported as a liquid. It is now rapidly becoming a widely used engine fuel in... read more

June 07
 

CIMAC WG05 | Statement EPA NPRM



Control of Emissions of Air pollution from Locomotive Engines and Marine compression-ignition engines less then 30 litres per cylinder. This publication discusses the following issues:... read more

September 05
 

CIMAC WG02 | Proposal IACS Implementation UR



Subject: Implementation of new or revised UR Background On the occasion of the last CIMAC WG2 meeting at Vaasa in April 2005 we ocassionally learned that some UR have been revised and... read more

September 05
 

CIMAC WG02 | Proposal IACS EIAPP Certificates



Subject: Delivery of EIAPP Certificates Background Since that moment when the new IMO regulations regarding NOx came into force claims from engine builders increased. The engine builders... read more

September 05
 

CIMAC WG02 | Proposal IACS Attendance TAT



Subject: Attendance at Type Approval Tests (TAT) Background: Within the last years quite some experience was gained during Type Approval Tests. We have realized that Class surveyors well attended... read more

October 04
 

CIMAC WG07 | Statement EPA CARB



Use of low sulphur diesel fuels in coastal waters. CARB / EPA propose that Ocean going ships must use only distillate fuels (diesel oil) with a low sulphur content and a low content of aromatic... read more

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