Piping System Macinery
Spaces of
Category A
Pump
Room
Bulkhead
and void
Ballast
System
Other
Dry
Cargo
Cargo
Hold
Fuel
Compart
ment
Accomodation
Service
Pipe
Tunnel &
Ducts
Weather
Deck
Sea Water OK   OK OK         OK OK
Ballast     OK OK OK OK OK   OK  
Measurement/Air OK OK OK OK OK OK OK   OK OK
Fuel Oil     OK OK     OK   OK  
Potable Cooling Water     OK OK     OK   OK  
Sanitary Drains     OK OK OK   OK OK OK OK
Sanitary(Internal) OK   OK OK OK   OK OK OK OK
Bilge Line     OK OK     OK   OK  
Vent Line     OK OK   OK     OK  
60 Flammble
Cargo Lines
    OK     OK     OK  
Sewage, Underwater Piping in compartment     OK     OK     OK  
Non-essential systems OK OK OK OK OK OK OK OK OK OK


Grating thickness(mm) 13~38
Square size(mm) 3838~25152
Wall thickness
(up/below mm)
5.8 / 5.0~12.2 / 9.0
Maximum size(mm) 5653050~12203660
Stress direction biaxial stress / lengthwise / across width
Drilling ratio 30%~82%
Weight(kg/m2) 5.8~50.4