502.05(01H) Condensate Amount

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Нижегородский Государственный Технический Университет им. Р.Е. Алексеева

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Description	Condensate Amount	502.05
Page 1 (2)	Condensate Amount	Edition 01H
Page 1 (2)		Edition 01H

		L23/30H

Ambient air temperature (1 bar)

	10	20	30		40		50	60			70
	0.10													atmospheric)
											bar
									1	.	0
air									1
air
in kg water / kg	0.08												bar	pressure (Above
												.0	bar
											2	.0
											2
	0.06
air	0.06												bar	air
air	Max. water content										.0			air
content of	Max. water content													Charge
	of atmosphere
	of atmosphere										3
			Ι	100%	90% 80%	70%	60%
	0.04
Water	0.04
Water
	A	B												in air tank
	0.02												Pressure
								ΙΙ

					ΙΙΙ			30	bar
								30

Relative	0
air humidity			30		40		50	60			70

Charge air temperature after cooler.

Air temperature in tank.

Fig. 1. Nomogram for calculation of condensate amount.

08028-0D/H5250/94.08.12

General

There is always a certain amount of water in air. When the air is saturated with aqueous vapour, the humidity is said to be 100% and there is as much water in the air as it can absorb without condensing. The amount of water in kg/kg air can be found from the diagram. The ability to absorb the water depends on the pressure and temperature of the air.

Amount of Condensation Water in The Charge Air

Receiver

Both higher pressure and lower temperature reduce the ability to absorb water. A turbocharged diesel engine takes air from outside, compresses and cools the air. Then, normally, the air cannot absorb the same amount of water as before.

Condensation of water in the engine's charge air receiver is consequently dependent on the humidity and the temperature of the ambient air. To find out if condensation in the charge air receiver will occur the diagram can be used.

Example:
6L23/30H, 720 rpm (P)	780	kW
Ambient air condition:
air temperature	35	°C
relative air humidity	90	%
Charge air temperature	50	°C
Charge air pressure	2.6	bar

As a guidance, an air consumption of 8.2 kg/kWh (Le) at full load can be used for MAN B&W Diesel

A/S, Holeby engines.

96.02 - ES1S-G

502.05	Condensate Amount	Description
Edition 01H	Condensate Amount	Page 2 (2)
Edition 01H		Page 2 (2)

L23/30H

Solution according to diagram:
Water content of air (l)	0.033	kg/kg
Max. water cont. of air (ll)	0.021	kg/kg

Amount of condensate in charge air receiver.

=(l - ll) x le x P

=(0.033 - 0.021) x 8.2 x 780 = 76,8 kg/h

Draining of Condensation Water

This phenomenon will occur on all turbocharged engines. For MAN B&W Holeby 4-stroke engines, there is no risk with a small amount of water in the charge air receiver. But if the charge air receiver is filled with water, there is a risk of getting water into the cylinder. This water has to be drained away. As standard a valve is mounted on the charge air receiver/cooler on the engine. This valve is to be used for draining of the water. If there is a great amount, the valve can be left half-open. If the amount is small, the charge air receiver can be drained periodically.

Amount of Condensate Water in Air Tanks

The volume of condensate in the air tank is determined by means of the curve at the bottom to the right of the diagram, representing an operating pressure of 30 bar.

Example:

Amount of condensate in air tank.

Volumetric capacity of tank(V)				4000	dm³
Temperature in tank (T)				40	°C=313K
Internal press. of tank (p)				30	bar
		= 31 x 105			N/m²(abs.)
Gas constant for air (R)				287	Nm/kg.K
Ambient air temperature				35	°C
Relative air humidity				90	%
Weight of air in tank
m =	p x V =	31 x 105 x 4		=	138 kg
	R x T	287 x 313
Solution acc. to above diagram:
Water content of air (l)				0.033	kg/kg
Max. water cont. of air (lll)			0.0015		kg/kg

Amount of condensate in air tank

=(I - III) x m.

=(0.033 - 0.0015) x 138 = 4.35 kg.

08028-0D/H5250/94.08.12

96.02 - ES1S-G

Working Card	Engine Performance Data	502-01.00
Page 1 (4)	Engine Performance Data	Edition 01H
Page 1 (4)		Edition 01H

08028-0D/H5250/94.08.12

L23/30H

Safety precautions:	Special tools:
Stopped engine	Plate no.	Item no.	Note.
Shut-off starting air
Shut-off cooling water	52005-01	109	Max. pressure
Shut-off fuel oil			indicator
Shut-off cooling oil
Stopped lub. oil circul.

Description:

Hand tools:

Measuring of engine performance data.

Starting position:

Engine is running.

Related procedure:

Man power:				Replacement and wearing parts:
Working time	:	½	hour	Plate no.	Item no.	Qty. /
Capacity	:	1	man
Data:
Data for pressure and tolerance				(Page 500.35)
Data for torque moment				(Page 500.40)
Declaration of weight				(Page 500.45)

96.37 - ES0U-G

502-01.00							Engine Performance Data																					Working Card
Edition 01H							Engine Performance Data																					Page 2 (4)
Edition 01H

L23/30H
										Engine Performance Data

		M/V		Engine Type						Engine No					Date/Year			Hour								Total Engine
	1		2					3						4			5							6		Running Hours

	7	Engine RPM	8				Fuel Type							9		Turbocharger								10		Turbocharger
	7		8	Visc.							Density			9	Type				Serial No					10		RPM

												Switchboard

	11	Effect (kW)			12	Voltage (V)								13	Current (A)					14		cos	j /kVAr
	11				12									13						14

												Cylinder Data
	15	Cylinder No.							1			2	3		4	5	6		7		8				9		16	Ave-
	15	Cylinder No.							1			2	3		4	5	6		7		8				9		16	rage
																												rage

	17	Fuel Pump Index					A
	17	Fuel Pump Index					B
							B

	18	Maximum Pressure (bar)					A
	18	Maximum Pressure (bar)					B
							B

	19	Compress. Pressure (bar)					A
	19	Compress. Pressure (bar)					B
							B

	20	Exhaust Temp. (° C)					A
	20	Exhaust Temp. (° C)					B
							B

	21	Cooling Water (°C)					A
	21	Cooling Water (°C)					B
							B

												Turbocharger
	22	Temp. inlet blower (° C)						23		Pressure before blower (mmWC)							24	Temp. after blower (° C)
	22							23									24

	25	Ñ Press. air cooler (mmWC)						26		Temp. charge air (° C)							27	Press. charge air (bar)
	25							26									27

	28	Temp. exhaust gas before TC (° C)						29		Temp. exhaust gas after TC (° C)							30	Press. exhaust gas after TC (mmWC)
	28							29									30

										Lubricating Oil System

	31	Temp. after engine (° C)						32		Press. before filter (bar)							33	Press. after filter (bar)
	31							32									33

	34	Temp. inlet engine (° C)						35		Press. before TC (bar)							36
	34							35									36
																													0D/H5250/94.08.12-08028
											Cooling Water System																		0D/H5250/94.08.12-08028
											Cooling Water System

	37	LT temp. inlet air cooler (° C)						38		LT temp. outlet air cooler (° C)							39	LT press. inlet air cooler (bar)
	37							38									39

	40	LT temp. inlet lub. oil cooler (° C)						41		LT temp. outlet lub. oil cooler (° C)							42	LT temp. inlet alternator (° C)
	40							41									42

		LT temp. outlet alternator (° C)								HT FW temp. inlet engine (° C)								HT FW press. inlet engine (bar)
	43							44									45

					Fuel Oil System

	46	Fuel oil temp. inlet engine (° C)						47		Fuel oil press. before engine (bar)
	46							47

	48							49														50	Sign.
	48							49														50

96.37 - ES0U-G

Working Card	Engine Performance Data	502-01.00
Page 3 (4)	Engine Performance Data	Edition 01H
		Edition 01H

08028-0D/H5250/94.08.12

Instruction for Filling in the Diagram "Engine Performance Data"

The numbers in the instruction are commensurate with the numbers in the diagram.

The automatic symbols mentioned in the instruction (TI 01, TI 03, PI 01 etc) refer to the diagrams printed in the instruction books for specified plants and page 500.20.

Engine Performance Data

1.Name of ship, if stationary name of plant.

2.Engine type.

3.Engine No.

4.Date/year of observations.

5.Hour, time of observations.

6.Total engine running hours - engineer's log-

book.

7.Engine revolutions per minute (RPM) - can be read on tachometer SI 90.

8.Fuel oil type: the viscosity must be stated (in cSt) and the temperature by which the viscosity has been measured, f.inst. 180 cSt/50°C. Density must be stated: g/cm³.

9.Turbocharger: type and serial number are stated on the rating plate of turbocharger and page 500.00.

10.Turbocharger revolutions per minute (RPM) - can be read on the tachometer SI 89.

Switchboard.

11.Alternator output (kW) - can be read on the main switchboard.

12.Voltage (V) - can be read on the switchboard.

13.Current (A) - can be read on the switchboard.

L23/30H

14.Cos j/kVAr - can be read on the switchboard.

Cylinder Data

15.Cylinder No. - can be read on engine plate. A/B is used for V-engines.

16.Average for all engine cylinders for point: 17- 18-19-20-21.

17.Fuel pump index - can be read on each of the high pressure fuel oil injection pumps.

18.Max pressure (bar) can be read for each cylinder by means of indicator or Pmax gauge.

19.Compression pressure (bar) - can be read for each cylinder by means of the indicator measurement, which is carried out during idling by nominal RPM.

20.Exhaust temperature (°C)

-thermometer TI 60.

21.Water outlet cylinder (°C) (jacket cooling)

-thermometer TI 11.

Turbocharger

22.Thermometer inlet blower (°C) can be read by means of a thermometer placed in the engine room near the air filter of the TC.

23.Pressure before blower (mmWC) - can be read by means of a mmWC instrument placed in the engine room near the TC.

24.Temperature after blower (°C) - can be read by means of a thermometer TI 30.

25.D Pressure air cooler (mm/WC).

26.Charge air temperature (°C). Temperature of the charge air in the charge air receiver.

-thermometer TI 31.

27.Pressure charge air (bar). Pressure of the charge air in the charge air receiver.

-pressure gauge PI 31.

96.37 - ES0U-G

502-01.00	Engine Performance Data	Working Card
Edition 01H	Engine Performance Data	Page 4 (4)
Edition 01H

L23/30H

28.Gas before temperature exhaust TC (°C)

-thermometer TI 62.

29.Exhaust gas temperature after TC (°C)

-thermometer TI 61.

30.Exhaust gas pressure after the TC (bar)

-pressure gauge PI 61.

Lubricating Oil System

31.Lub. oil inlet cooler temperature (°C)

-thermometer TI 20.

32.Lub. oil pressure before the filter (bar)

-pressure gauge PI 21.

33.Pressure of the lub. oil after the filter (bar)

-Pressure gauge PI 22.

The filter element should be replaced with a pressure drop across the filter of 1.5 bar (see section 615).

34.Lub. oil inlet engine temperature (°C)

-thermometer TI 22.

35.Lub. oil pressure before the turbocharger

(bar).

-pressure gauge PI 23.

Cooling Water System

37.Low temperature (LT) cooling water temperature (sea, raw or fresh) at inlet charge air cooler (°C)

-thermometer TI 01.

38.Low temperature (LT) cooling water temperature (sea, raw or fresh) at outlet charge air cooler (°C)

-thermometer TI 02.

39.Low temperature (LT) cooling water pressure (sea, raw or fresh) at inlet charge air cooler (bar)

-pressure gauge PI 01.

40.Low temperature (LT) cooling water tempera-

ture (sea, raw or fresh) at inlet lub. oil cooler (°C)

-thermometer TI 07.

41.Low temperature (LT) cooling water temperature (sea, raw or fresh) at outlet lub. oil cooler °C)

-thermometer TI 03.

42.Low temperature (LT) cooling water temperature (sea, raw or fresh) at inlet alternator (°C)

-thermometer TI 04.

43.Low temperature (LT) cooling water temperature (sea, raw or fresh) at outlet alternator (°C)

-thermometer TI 05.

44.High temperature (HT) fresh water temperature (FW) at inlet engine (°C)

-thermometer TI 10.

45.High temperature (HT) fresh water temperature (FW) of outlet engine (°C)

-thermometer TI 10.

Fuel Oil System

46.Fuel oil temperature at inlet engine (°C)

-thermometer TI 40.

47.Fuel oil pressure before engine (bar)

-pressure gauge PI 40.

48.

49.

50.Signature.

08028-0D/H5250/94.08.12

96.37 - ES0U-G

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