8.11 Change-over to and from gas - general
If you change-over the fuel to and from gas operation, you have to obey the related limits.
If the engine has the optional fuel sharing mode, there are some more limits.
8.11.1 Change-over from liquid fuel to gas
If you change-over from liquid fuel to gas, the engine must operate at MDO. If you operate the
engine at HFO, there is an interlock for change-over to gas. Thus you first must change-over
from HFO to MDO, refer to section 8.10 Change-over the diesel fuel - general.
The change-over from MDO to gas has the limits that follow:
•
The engine load must be in the range of 10% to 80% of CMCR.
•
You only can start the procedure manually.
•
Related to the conditions the procedure takes approximately one to two minutes. The
ECS does some tests. If the tests are satisfactory the ECS slowly changes from diesel
mode to gas mode.
NOTE: When you operate the engine continuously in gas mode for more than one week,
WinGD recommends to change back to diesel mode one time each week. In diesel
mode operate the engine for approximately 5 to 10 minutes at a high load of a
minimum of 60%. The injection of diesel fuel makes free the holes in the nozzle tip of
the injection valves (“cleaning shots”) and thus decreases or prevents clogging of the
holes. For more data refer to the service letter SL-0005.
NOTE: The operation in diesel mode obeys the IMO Tier II regulations. Thus do this change-
over to diesel mode out of ECA zones.
8.11.2 Change-over from gas to liquid fuel
If there is a change-over from gas to liquid fuel, the ECS quickly changes to liquid fuel. First the
liquid fuel is always MDO. Then you manually can change-over to HFO, if necessary.
The change-over from gas to MDO has the limits that follow:
•
The engine load can be in the range of 5% to 100% of CMCR.
•
If a safety limit is given, the ESS or the ECS start the procedure automatically (gas trip).
•
You also can start the procedure manually.
•
The procedure is done during one turn of the crankshaft.
X92DF
AA00-0000-00AAA-130H-A
Operation Manual Change-over to and from gas - general
Winterthur Gas & Diesel Ltd.
- 460 - Issue 002 2020-08
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