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 to manufacturers and fitters of how different piping systems shall
be treated, cleaned and protected before delivery and installation. All piping must be checked
and cleaned from debris before installation. Before taking into service all piping must be
cleaned according to the methods listed 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
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)
C = Purging with compressed air
D = Pickling
F = Flushing
5.7.1 Pickling
Pipes are pickled in an acid solution of 10% hydrochloric acid and 10% formaline inhibitor for
4-5 hours, rinsed with hot water and blown dry with compressed air.
After the acid treatment the pipes are treated with a neutralizing solution of 10% caustic soda
and 50 grams of trisodiumphosphate per litre of water for 20 minutes at 40...50°C, rinsed with
hot water and blown dry with compressed air.
5-4 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide5. Piping Design, Treatment and Installation
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