48 60B project guide

Engine and operation 2.7.17 Venting amount of crankcase and turbocharger

2.7. 2. 7.1 17

Ven enti ting ng am amou ount nt of cr cran ankc kcas ase e an and d tu turb rboc ocha harg rger er

 As described under the "Section: Crankcase vent and  tank vent"  it  it is needed to ventilate the engine crankcase and the turbocharger. For layout of the ventilation system following statement should serve as a guide: Due to normal blow by of the piston ring package small amounts of gases of the combustion chamber get into the crankcase and carry along oil dust. •   The amount of crankcase vent gases is

approx. approx.

0.1 % of the engine´s air air flow rate. •   The temperature of the crankcase vent gases is

approx. 5 K higher than the oil temperature temperature at at the engine´s oil inlet. •   The

density of crankcase vent gases is 1.0 kg/m³ (assumption (assumption for calculation). calculation).

Sealing air of the turbocharger additionally needs to be vented. •   The

amount of turbocharger sealing air is approx. 0.2 % of the engine´s air air flow rate.

•   The temperature of

turbocharger sealing air is approx. 5 K higher than the oil temperature temperature at at the engine´s oil inlet.

•   The

density of turbocharger sealing air is 1.0 kg/m³ (assumption (assumption for calculation). calculation).

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48/60B Project Guide – Marine Four-stroke diesel engines comp co mplilian antt wit with h IMO IMO Ti Tier er II

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Status

Version

Checked

09.2011

2.16

Utjesinovic

Date

2011-09-27

Checked

Schmid

Date

2011-09-27

Engine and operation 2.7.17 Venting amount of crankcase and turbocharger

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Engine and operation 2.9.1 Maximum allowed emission value NO x IMO Tier II

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48/60B

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