CEN WORKSHOP CWA 15375 August 2005 AGREEMENT ICS 47.020.30 English version Separators for marine residual fuel - Performance testing using specific test oil This CEN Workshop Agreement has been drafted and approved by a Workshop of representatives of interested parties, the constitution of which is indicated in the foreword of this Workshop Agreement. The formal process followed by the Workshop in the development of this Workshop Agreement has been endorsed by the National Members of CEN but neither the National Members of CEN nor the CEN Management Centre can be held accountable for the technical content of this CEN Workshop Agreement or possible conflicts with standards or legislation. This CEN Workshop Agreement can in no way be held as being an official standard developed by CEN and its Members. This CEN Workshop Agreement is publicly available as a reference document from the CEN Members National Standard Bodies. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.:CWA 15375:2005 D/E/F
Contents Foreword...3 Introduction...4 1 Scope...5 2 Normative references...5 3 Terms and definitions...5 4 Test arrangements...6 5 Performance test...8 6 Analysis...10 7 Test report...10 Annex A...11 Annex B...12 2
Foreword This CEN Workshop Agreement has been drafted and approved by a Workshop of representatives of interested parties on 2005-07-04, the constitution of which was supported by CEN following the public call for participation made on 2004-05-05. A list of the individuals and organisations that supported the technical consensus represented by the CEN Workshop Agreement is available to purchasers from the CEN Management Centre. These organisations were drawn from the following economic sectors: Classification societies, Diesel engine manufacturers, Oil companies, Separator manufacturers and Ship owners and operators. The formal process followed by the Workshop in the development of the CEN Workshop Agreement has been endorsed by the National Members of CEN but neither the National Members of CEN nor the CEN Management Centre can be held accountable for the technical content of the CEN Workshop Agreement or possible conflict with standards or legislation. This CEN Workshop Agreement can in no way be held as being an official standard developed by CEN and its members. The final review/endorsement round for this CWA was started on 2005-04-05 and was successfully closed on 2005-06-15. The final text of this CWA was submitted to CEN for publication on 2005-07-04. This CEN Workshop Agreement is publicly available as a reference document from the National Members of CEN: AENOR, AFNOR, BSI, CSNI, CYS, DIN, DS, ELOT, EVS, IBN, IPQ, IST, LVS, LST, MSA, MSZT, NEN, NSAI, ON, PKN, SEE, SIS, SIST, SFS, SN, SNV, SUTN and UNI. Comments or suggestions from the users of the CEN Workshop Agreement are welcome and should be addressed to the CEN Management Centre. 3
Introduction In general, diesel engines for propulsion of ships burn marine residual fuels. Marine residual fuels contain the residue remaining after lighter fractions have been extracted from the crude oil during various processes in the oil refinery. They are a blend of this heavy fraction to which other refinery stream products are added to obtain the desired viscosity grade. Marine residual fuel oils contain elements inherent to the product itself but they also contain some contaminants, which either are due to an external contamination or enter into the fuel at the refinery during production, such as small fragments of a catalyst, used in the catalytic cracking stage in order to cut long molecule chains into smaller molecule chains. The catalyst fines are extremely hard and abrasive, and if not removed from marine residual fuel, can damage diesel engines with severe economic and, in extreme cases, safety consequences. The normal way of removing catalyst fines and other contaminants from marine residual fuel is by centrifugal separation. It is important that all fuels are centrifuged efficiently to minimise the level of contaminants, including catalyst fines. In bunkered oil the maximum content of catalyst fines, expressed as the total content of Aluminium and Silicon, is 80 mg/kg according to ISO 8217:1996. For bunkered fuels containing the maximum level of catalyst fines (80 mg/kg), engine builders expect the level of catalyst fines to be reduced to below 15 mg/kg, in the fuel entering the engine. As the level of catalyst fines in the bunkered fuel is lowered, the engine builders expect a related reduction in the amount of catalyst fines in the fuel entering the engine. For many years now there has been a demand from engine builders, ship builders, ship owners and classification societies for reliable performance criteria for the separators' ability to remove abrasive particles from marine residual fuels. The purpose of this CEN Workshop Agreement is to meet this demand by specifying a repeatable method to determine separation performance as regards specific test particles in specific test oil. 4
1 Scope This CEN Workshop Agreement is applicable to marine residual fuel separators. The procedure defines a performance parameter, Certified Flow Rate (CFR), at equivalent fuel oil viscosities of 380 mm 2 /s and 700 mm 2 /s at 50 C, using specific test oil under specific test conditions. The performance parameter (CFR), derived in accordance with this procedure may be used to compare separation performance of commercially available machines intended for marine application. However, it cannot be assumed that the same separation performance would be obtained on real catalyst fines in real heavy fuel oil. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 3104:1996, Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity (ISO 3104:1994) EN ISO 3675:1998, Crude petroleum and liquid petroleum products - Laboratory determination of density - Hydrometer method (ISO 3675:1998) EN ISO 3838:2004, Crude petroleum and liquid or solid petroleum products Determination of density or relative density Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods (ISO 3838:2004) EN ISO 12185:1996, Crude petroleum and petroleum products - Determination of density - Oscillating U-tube method (ISO 12185:1996) ISO 8217, Petroleum products - Fuels (class F) - Specification of marine fuels ISO 13320-1:1999, Particle size analysis Laser diffraction methods Part 1: General principles ISO 11171:1999, Hydraulic fluid power Calibration of automatic particle counters for liquids 3 Terms and definitions 3.1 Separation efficiency Separation efficiency is a measure of the separator's capability to remove test specific contaminants. The separation efficiency is defined as follows: η = 100 (1 C out /C in ), where η is separation efficiency in %, C out is number of the test specific particles in cleaned test oil, C in is number of the test specific particles in test oil before separator. The method to be used to count the test particles is as given in ISO 13320-1:1999 (and particle counter calibrated in accordance with ISO 11171:1999), or equivalent, validated method. 3.2 Certified Flow Rate (CFR) Certified Flow Rate is defined as the flow rate in l/h, 30 minutes after sludge discharge, at which the separation efficiency of the separator is 85 % using the test specific oil defined in 3.3.1 and the test specific particles defined in 3.3.5. 3.3 Test medium properties 3.3.1 Test oil specification The test oil shall be an automotive lube oil of type PAO 6 (or equivalent). This is a polyalphaoleophine used as a base for synthetic lubricating oils. 3.3.2 Test oil kinematic viscosity The test oil kinematic viscosity is to be measured according to EN ISO 3104. The oil kinematic viscosity can be expressed as: 5