● Pipes between engine and jacket water preheater
5.6 Local gaug es
Local thermometers should be installed wherever a new temperature occurs, i.e. before and
after heat exchangers, etc.
Pressure gauges should be installed on the suction and discharge side of each pump.
5.7 Cleaning procedures
Instructions shall be given at an early stage to manufacturers and fitters how different piping
systems shall be treated, cleaned and protected.
5.7.1 Cleanliness during pipe installation
All piping must be verified to be clean before lifting it onboard for installation. During the
construction time uncompleted piping systems shall be maintained clean. Open pipe ends
should be temporarily closed. Possible debris shall be removed with a suitable method. All
tanks must be inspected and found clean before filling up with fuel, oil or water.
Piping cleaning methods are summarised in table below:
Table 5-3 Pipe cleaning
MethodsSystem
A,B,C,D,FFuel oil
A,B,C,D,FLubricating oil
A,B,CStarting air
A,B,CCooling water
A,B,CExhaust gas
A,B,CCharge air
1)
In case of carbon steel pipes
Methods applied during prefabrication of pipe spools
A = Washing with alkaline solution in hot water at 80°C for degreasing (only if pipes have been greased)
B = Removal of rust and scale with steel brush (not required for seamless precision tubes)
D = Pickling (not required for seamless precision tubes)
Methods applied after installation onboard
C = Purging with compressed air
F = Flushing
5.7.2 Fuel oil pipes
Before start up of the engines, all the external piping between the day tanks and the engines
must be flushed in order to remove any foreign particles such as welding slag.
Disconnect all the fuel pipes at the engine inlet and outlet . Install a temporary pipe or hose
to connect the supply line to the return line, bypassing the engine. The pump used for flushing
should have high enough capacity to ensure highly turbulent flow, minimum same as the max
5-4 DAAB605814
Wärtsilä 46F Product Guide5. Piping Design, Treatment and Installation
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