One manhole or where necessary two
b. A filling/ suction pipe
c. Ventilation according to approved system drawing. Where vent dia. exceeds 150mm two vents each 125mm to be installed. No vents to exceed 150mm dia to prevent unnecessary obstacles on deck.
Each vent to be equipped with ball check valve or as otherwise specified in detailed drawing.
d. Sounding pipe to be as straight as possible led directly to lowest point in tank and to be equipped with doubler on tank bottom, or striking plate at lower end of sounding pipe, according to Class requirements.
e. Docking plugs (40mm) manufactured out of stainless steel, and marked with tank number and number of frame.