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Engine Load Program Update

This service bulletin discusses improvements to the load program on Wärtsilä RTA96C engines that can improve piston running behavior. The current load program results in a significant condensate flow peak during acceleration that can cause water carry-over issues. The improved load program reduces this condensate flow peak by lengthening the acceleration time from maneuvering speed to full away speed by up to 33 minutes. This is achieved by changing the parameter T4 setting to a minimum of 45 minutes or recommended 60 minutes, compared to the previous minimum of 20 minutes or recommended 27 minutes.

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238 views4 pages

Engine Load Program Update

This service bulletin discusses improvements to the load program on Wärtsilä RTA96C engines that can improve piston running behavior. The current load program results in a significant condensate flow peak during acceleration that can cause water carry-over issues. The improved load program reduces this condensate flow peak by lengthening the acceleration time from maneuvering speed to full away speed by up to 33 minutes. This is achieved by changing the parameter T4 setting to a minimum of 45 minutes or recommended 60 minutes, compared to the previous minimum of 20 minutes or recommended 27 minutes.

Uploaded by

Raul Diaz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 4

Service Bulletin RT-84

28.08.2009

Technical Information to all Owners / Operators


of Wärtsilä RTA96C, RTA96C-B and RT-flex96C engines

Load Program

Contents
1 Introduction 1
2 Current load program 1
3 Improved load program 2

Wärtsilä Switzerland Ltd PO Box 414 Tel.: +41 52 262 80 10


Wärtsilä Schweiz AG CH-8401 Winterthur Fax: +41 52 212 71 03
Wärtsilä Suisse SA Switzerland technicalsupport.chts@wartsila.com
1 Introduction
It has been shown that by altering the load program to achieve a longer
acceleration time of the engine, the piston running behavior can be
improved.
This can be achieved by changing the time settings of the load program. The
acceleration time for the ship to gain full away speed will be prolonged by
up to 33 minutes.

2 Current load program


With the current load program there is a significant condensate flow peak
from the scavenge air cooler during acceleration of the engine, especially
when operating in tropical areas.
With the present condensate flow peak there is a certain degree of water
carry-over through the water separator. Water carry-over can be harmful for
the piston running behavior depending on the amount and ambient
conditions (Figure 1).

SAC condensate flow in transient engine operation


250

Engine speed in % of nominal speed


Current condensate flow
Current specification
200
Condensate flow

150

100

50

0
0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00
Duration in hours
Figure 1

1/3 Service Bulletin RT-84


3 Improved load program
With an improved load program the condensate flow is reduced
significantly (Figure 2).

SAC condensate flow in transient engine operation


250

Engine speed in % of nominal speed


Current condensate flow
New condensate flow
Current specification
200
New Wärtsilä specification
Condensate flow

150

100

50

0
0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00
Duration in hours
Figure 2

3.1 Settings
The new settings of parameter T4 will change the load-up phase from full
maneuvering speed to full away speed. It is indicated with the vertical
dashed lines in diagram (Figure 3).
The load-up phase from engine start to full maneuvering will remain the
same.
Consequently the load-up to full away speed will take up to 33 minutes
longer than with the previous settings.

Minimum Recommended Parameter value

Current Settings 20 min 27 min T4

New Settings 45 min 60 min T4

Table 1

Note: The code for the parameter T4 (Wärtsilä designation) depends on the
Remote Control System maker. Please contact the maker of your system for
adjustment to the new load program settings.

2/3 Service Bulletin RT-84


Load-up scheme 96C in transient engine operation
110

Engine speed in % of nominal speed


100

90

80

70

60

50
Current specification
New specification
40
0:00 0:30 1:00 1:30 2:00 2:30 3:00 3:30 4:00
Duration in hours

Figure 3

Note: Load down time shall remain the same as originally specified.

3/3 Service Bulletin RT-84

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