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5. Piping Design, Treatment and Installation
● Ship Rules Part 6 Chapter 13, Gas Fuelled Engine Installations
Table 5-2
Media
Steam
Flammable fluid
Fuel gas
Other media
5.5
Insulation
The following pipes shall be insulated:
● All trace heated pipes
● Exhaust gas pipes
● Exposed parts of pipes with temperature > 60°C
Insulation is also recommended for:
● Pipes between engine or system oil tank and lubricating oil separator
● Pipes between engine and jacket water preheater
5.6
Local gauges
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
System
Fuel gas
Fuel oil
Lubricating oil
5-4
Classes of piping systems as per DNV rules
Class I
MPa (bar)
> 1.6 (16)
> 1.6 (16)
All
> 4 (40)
Pipe cleaning
Methods
A,B,C
1)
D,F
A,B,C,D,F
A,B,C,D,F
Class II
°C
MPa (bar)
or > 300
< 1.6 (16)
and < 300
or > 150
< 1.6 (16)
and < 150
All
-
or > 300
< 4 (40)
and < 300
Wärtsilä 31DF Product Guide
Class III
°C
MPa (bar)
< 0.7 (7)
and < 170
< 0.7 (7)
and < 60
-
-
< 1.6 (16)
and < 200
DBAE248994
°C
-
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