3.1 "The valve" in the second sentence means "sea
inlet valve".
3.2 In cases where suction or discharge piping
penetrating machinery spaces are enclosed in a substantial steel casing,
or are insulated to "A-60" class standards, it is not necessary to
enclose or insulate "distance pieces", "sea inlet valves" and "sea-chests".
For this purpose, the discharge piping means piping between the emergency
fire pump and the isolating valve.
3.3 The method for insulating pipes to "A-60"
class standards" is that they are to be covered/protected in a practical
manner by insulation material which is approved as a part of "A-60"
class divisions in accordance with the FTP Code.
3.4 Where the sea inlet valve is in the machinery
space, the valve should not be a fail-close type. Where the sea inlet
valve is in the machinery space and is not a fail-open type, measures
should be taken so that the valve can be opened in the event of fire,
e.g. control piping, actuating devices and/or electric cables with
fire-resistant protection equivalent to "A-60" class standards.
3.5 In cases where main fire pumps are provided
in compartments outside machinery spaces and where the emergency fire
pump suction or discharge piping penetrates such compartments, the
above interpretation should be applied to the piping.