MAN DieselMAN Diesel AlS • Denmark SL07-479/HRR June 2007 Service Letter Cylinder Lubrication New ACC Guidelines All MC/MC-C and ME/ME-C type engines Mk 6 and higher, with Alpha ACC System Action Code: WHEN CONVENIENT Dear Sirs Since our last Service Letter SL05-455 concerning Cylinder Lubrication, the default feed rate sulphur proportional factor has been in the range of 0.34 to 0.26 g/kWh x S%, with an absolute minimum at 0.70 - 0.60 g/kWh. However, many engines have followed the lowest level in the range, and evaluations of the results regarding wear, scuffing resistance and TBO show that this dosage is superior to higher levels. Therefore, we now recommend a fixed schedule for navigating from the upper level to the lower level in the range, within a 2,000-hour period. Consequently, the recommended basic feed rate after running-in is 0.26 g/kWh x S%, with the absolute lower limit at 0.60 g/kWh. Specific Cylinder Oil Dosages Alpha ACC is the default lubrication mode for modern MAN B&W two-stroke engines, i.e. lube oil is dosed at a feed rate proportional to the engine load and proportional to the sulphur content in the fuel oil. This ensures that the alkali additives in the cylinder oil are applied proportionally with the amount of sulphur entering into the combustion chamber. The build up of a safe oil film is ensured at any time by the lower limit of 0.60 g/kWh. HEAD OFFICE (& postal address) MAN Diesel NS T eglholmsgade 41 2450 Copenhagen SV Denmark Phone: +45 33 85 11 00 Fax: +4533851030 [email protected] www.manbw.com PrimeServ Teglholmsgade 41 2450 Copenhagen SV Denmark Phone: +45 33 85 11 00 Fax: +45 3385 10 49 diesel·[email protected] PRODUCTION T eglholmsgade 35 2450 Copenhagen SV Denmark Phone: +45 33 85 11 00 Fax: +4533851017 man ufactu [email protected] FORWARDING & RECEIVING Teglholmsgade 35 2450 Copenhagen SV Denmark Phone: +45 33 85 11 00 Fax: +4533851016 MAN Diesel NS Denmark Reg. No.: 39661314 MAN Diesel - a member of the MAN Group ~.40 0.000 hours should be used for a gradual reduction towards the basic setting.10 111 1. ACC running with the factor 0.e. we recommend a relatively high fixed dosage: t. Ace Cylinder Lubrication. Average Cylin der Oil Consumption Due to the sulphur dependency.~.5 1.70 f . i.5 3 5 Sulphur % Fig.000-hour period.50 "" 0 .5 4 4. According to DNV. 90 0. 1: ACe Cylinder Lubrication . Th e size of the steps may depend on the evaluation of the actual lubricating and deposit condition appearing from scavenge port inspections. January 2007 :::1 1.. -.c 0 .---~.26 g/kWh x S% should take place stepwise over a 2.30 0 . After these 500 hours of initial running-in. . the average Cylinder Oil Consumption depends on the sulphur content in fuel bunkers.50 1. see the feed rate chart below. where ample oil is used for flushing away wear particles from the sliding surfaces.-2 - MAN Diesel Running-in During the first running-in.5 g/kWh for the first 250 hours succeeded by 1.00 : .40 !E! ~::~ ) 1.2 g/kWh fo r another 250 hours.20 0.~~~-~ o 0.~~~--~---~~~-~--. January 2007 Regulating from the upper ACC factor 0.g 0.34 g/kWh x S% to the basic setting at 0.& 0.~.~.80 1 l' .3 Running-in range i l' 000 .26 g/kWh x S%.060 ~~~~~~~~~~~~~~~ 2 g .10 r i f E. 2 below. .5 2 2. the ACC factor 0.5 3. worldwide deliveries in 2006 have been recorded as shown in Fig. The next 2.34 g/kWh x S% should be introduced. 26 g/kW h x S%. • " 0 ·• - - - - I-- 1- I-- 0 • "~ "~ . 2: Sulph ur content 2006 Abo ut 40% of a ll fue l bunkers have a su lphur co nte nt below 2. and consequ ently ca ll for the minimum dosage of 0. On average. Consequently.3%. This negative influence is natura lly time based and beco mes more and more seve re the lower th e sulphur content gets.2%. we recommend to change to a lower BN cy linde r oil when ope rating on sulph ur levels below 1. Questions or com ments regarding this SL should be di rected to ou r Ope ration Dept. so urce DNV Pe trole um Services •0 • n•. . LEO. 0. there will be a surplus of alkali additives . Cl :. 0 • ~ •• SUL. Le.6 g1kWh should be maintained .5% for more than 1 to 2 weeks.-3- MAN Diesel SULPHU R 20(}6 . 0 ~ • 0 " . •• • . when using a normal BN70 cylinder oil. As a rule of th umb.60 g/kWh. ours faithfu lly AN Diesel AlS £g~a~b::{ / Enc!.. Operating on low sulph ur fuels At sulphu r levels below 2.. the min imum dosages at 0.. this results in a yearly absolute Cylinder Oil Dosage of 0 .PHUR CONTENT % Fig. Abo ut 60% of all fu el bunkers call fo r the sulph ur dependent lube co ntro l.70 g/kW h. Unused alkali additives have a negative influence on the cylinde r cond ition due to acc umulation on the piston top land and due to lack of refresh ment of the liner su rface by corrosion. 5 g/kWh 1.MAN Diesel Encl. adjustments of the lube oil rate should be considered. sticking piston rings or high liner temperature fluctuations. the lubrication and the pressures should be normalised.7 g/kWh 1. In case of scuffing. Mk 6 and higher. During starting. Basic setting Standard BN 70 cylinder oil BN 40 cylinder oil 0.26 g/kWh x S% 0. Lubrication of cylinders that show abnormal conditions: Frequent scavenge port inspections of piston rings and cylinder liners are very important for maintaining a safe cylinder condition.2 g/kWh and the Pmax and Mep reduced. If irregularities are observed. load over 5 hours Running-in new rings in already run-in and well running liners: No load restrictions Manoeuvring and load change situations. with Alpha ACC lubrication system and coated piston rings.45 g/kWh x S% Minimum feed rate 0. As soon as the situation is stabilised. 1 for SL07-479 Guiding Cylinder Oil Feed Rates S/L/K-MC/MC-C/ME/ME-C.60 g/kWh Maximum feed rate during normal service 1. manoeuvring and load changes. the feed rate should be increased by means of the “LCD” by 25% and kept at this level for ½ hour after the load has stabilised.26 g/kWh x S% Stepwise increase to max. th HRR 6 February 2007 P P .34 to 0.7 g/kWh Part-load control Proportional to indicated engine load Running-in new or reconditioned liners and new piston rings Feed rate: Engine load: First 5 hours: From 5 to 250 hours: From 250 to 500 hours: From 500 to 2500 h: 1.2 g/kWh Stepwise reduction from 0. the feed rate should be raised to 1. 9 3. 2 for SL07-479 Adjusting Alpha Lub.5 2.2 1.8 2.13 1.9 3.2 2.2 1.1 3.9 2.0 3.51 0.0 2.5 1.0 0 1.5 2.5 2.58 0.4 1.8 0 1.1 1.7 1.4 2.0 3.9 2. BN40 Cylinder Oil ACC Factor g/kWh x S%: 0.8 1.3 2.1 2.4 2.19 1.4 1.45 0.3 1.2 1.61 1.8 2.8 2.6 2.0 3.37 1.43 1.MAN Diesel Encl.8 2.7 2.9 3.1 3.6 2.6 2.1 3.1 2.7 2.6 2.4 2.9 2.5 2.4 0 1.7 1.4 2.8 2.77 0.4 1.9 2.2 1.4 2.55 1.83 0. using ACC.3 2.0 2.7 2.3 2.9 0.2 2.3 2.4 1.7 1.89 0.0 2.3 3.0 2.0 2.8 1.3 1.25 1.4 1.71 0.0 3.8 2.2 2.5 1.6 1.2 3.5 1.2 2.5 1.4 2.6 1.4 1.0 3.2 2.1 .52 0.5 1.9 2.8 2.5 2.4 2.1 2.3 1.6 2.5 2.31 1.01 1.8 3.49 1.8 1.3 3.7 3.7 2.5 2.6 2.5 3.1 1.6 1.1 2.0 1.60 g/kWh HMI setting 0 1.47 0.6 2.0 2.3 1.2 3.54 0.67 1.8 1.9 3.1 2.3 1.1 1.4 1.6 0 1.7 1.2 3.60 0.9 3.5 1.70 56 56 60 66 71 77 82 88 93 98 104 109 115 120 126 131 137 142 148 153 156 Sulphur Content %: 0 1.3 1.65 0.6 1.8 1.6 1.95 1.0 2.4 3.60 0.3 0 1.5 1.3 3.4 3.07 1.2 1.3 2.7 1.6 1.3 2.6 3.7 2.1 2.7 1. 39 1.60 0.8 2.4 3.6 1.5 3.2 3.0 3.0 0.3 4.4 1.0 2.5 1.4 2.9 4.60 0.6 1.0 3.26 0.5 0.1 1.2 3.1 3.6 1.4 2.6 2.7 1.26 1.9 4.1 4.4 3.2 3.0 1.5 1.3 3.3 2.0 2.19 1.6 3.6 3.7 1.85 0.0 0.8 2.5 2.8 2.3 3.3 4.2 2.8 2. BN 70 Cylinder Oil ACC factor g/kWh x S% 0.8 2.5 0.5 3.16 1.99 1.1 1.4 2.5 1.1 1.0 4.5 1.8 2.60 0.22 1.5 2.0 2.1 4.9 3.5 1.5 0.0 1.1 1.0 4.8 3.5 1.3 1.6 2.2 1.9 4.1 4.6 2.1 2.3 1.0 4.75 0.6 1.3 3.8 3.8 3.4 3.6 3.8 3.5 1.02 1.3 3.6 2.1 1.6 2.5 1.05 1.4 2.4 1.8 3.4 1.4 1.88 0.0 0.4 3.2 1.1 3.7 2.5 0.2 4.7 2.0 0.5 3.4 4.0 1.3 2.4 4.5 2.34 g/kWh HMI setting 0.1 2.3 4.5 2.2 2.0 3.2 1.65 0.92 0.9 3.3 3.6 2.30 0.1 4.53 56 56 56 56 56 56 56 56 56 56 56 59 63 66 69 72 75 78 81 84 88 91 94 97 100 103 106 109 113 116 119 122 125 128 131 134 138 141 Sulphur content % 0.3 3.9 2.2 4.1 4.6 3.9 4.8 1.8 3.6 3.2 4.1 3.0 0.0 4.95 0.0 1.0 1.5 3.12 1.8 3.7 2.9 3.5 0.1 3.9 4.2 2.60 0.5 0.9 3.0 3.36 1.5 1.6 1.29 1.78 0.33 1.4 3.1 1.3 4.3 4.0 3.5 .33 0.0 3.1 3.60 0.7 3.4 2.2 2.4 4.2 1.7 3.3 4.4 1.9 3.2 3.3 2.3 2.2 1.29 0.27 0.2 3.50 1.3 1.31 0.1 1.7 3.8 1.2 1.0 2.2 1.4 2.10 1.3 2.60 0.7 3.5 2.9 4.2 2.60 0.2 4.6 3.6 3.MAN Diesel Encl.6 2.43 1.0 2.82 0.71 0.1 2.0 4.0 3.3 1.2 4.8 2.2 3.0 1.9 2.60 0.0 1.2 2.0 4.4 1.5 3. 3 for SL07-479 Adjusting Alpha Lub.8 2.5 1.5 2.0 2.9 3.60 0.1 4. using ACC.0 0.1 2.7 2.9 4.4 1.3 3.0 0.4 3.3 2.68 0.60 0.9 2.3 4.5 3.0 2.6 1.8 2.2 4.4 2.3 1.46 1.4 4.6 1.8 3.5 2.4 4.7 2.60 0. 8 Scavenge port insp. 4 for SL07-479 1. 11 October 2006 500 1000 1500 2000 Hours 2500 3000 3500 0.48 0.52 0.32 0.16 4000 ACC feed rate factor (g/kWh/S%) Initial running-in dosage g/kWh ACC Running-in Schedule .26 0. * 0.MAN Diesel MAN Diesel A/S • Denmark Encl.42 0. 0.50 0.4 Scavenge port insp. Feed rate factor reduction curve(g/kWh/S%) 1.44 0.46 0.18 0.24 0.6 * Fixed running-in dosage (g/kWh) Scavenge port insp.20 0.22 0.30 0. * Scavenge port insp.38 0.6 * * Scavenge port insp.4 * 1.40 0.36 0.2 Scavenge port insp.28 0.34 0. 0.2 0 HRJ 2300.8 1.2 Running-in period with fixed lubrication 0 Change to ACC ACC optimisation phase Optimum ACC setting -0. 1 0.