SUS304 stainless steel breathable cap, stainless steel air pipe head, stainless steel air cap.

Air pipe closing device
Application field of marine air pipe head:

Marine fuel tank, air pipe head, precipitating cabinet, marine air pipe head and lubricating oil tank, marine air pipe head.
Air cap for ship's tail tip, air connector for engine room, air cap for cabin, air cap of ballast tank, ballast tank, air pipe head / fresh water tank for freshwater tank, and so on

About the function of AIR PIPE HEAD self closing device for marine air pipe head,

The ship's buoy air pipe head, the ballast air cap on the ship is mainly through air suction and breathing is the air pressure in the cabinets close to the atmospheric pressure, to keep the pressure within the design pressure of the cabinets, and to prevent the sea water, rain, and Mars entering the cabinets at the same time preventing the sea waves from entering the breathable pipe to the cabin.

About shipping air pipe / marine ventilating cap replacement instructions / order note:

First, you can choose according to our standard: CB/T3594-1994 marine air pipe head ship list.
The standard size of -D, DS buoy oil tank breathable cap and buoy type water tank head is as follows:

For example:
DN50 oil tank air pipe / oil tank breathable cap, floating ball oil tank breathable cap FS50, its flange size can be selected as follows:

Flange size 1: outer diameter 135mm center distance (eye distance) 103mm 6 hole.
Flange size two: outer diameter 140mm center distance (eye distance) 110mm 4 holes.
JIS-5K: outer diameter 130mm center distance (eye distance) 105mm 4 hole.
JIS-10K: outer diameter 155mm center distance (eye distance) 120mm 4 hole.
DIN-16K: outer diameter 165mm center distance (eye distance) 125mm 4 hole.
AISI-150LB: outer diameter 152mm center distance (eye distance) 120mm 4 hole.
DN65 fuel tank air pipe / fuel tank breathable cap, its flange size can be selected as follows:
Flange size 1: outer diameter 155mm center distance (eye distance) 123mm 6 hole.
Flange size two: outer diameter 160mm center distance (eye distance) 130mm 4 holes.
JIS-5K: outer diameter 155mm center distance (eye distance) 130mm 4 hole.
JIS-10K: outer diameter 175mm center distance (eye distance) 140mm 4 hole.
DIN-16K: outer diameter 185mm center distance (eye distance) 145mm 4 hole.
AISI-150LB: outer diameter 178mm center distance (eye distance) 139mm 4 hole.

DN125's tail tip cabin air pipe / tail cabin breathable cap. Its flange size can be selected as follows:

Flange size 1: outer diameter 215mm center distance (eye distance) 183mm 10 hole.
Flange size two: outer diameter 240mm center distance (eye distance) 200mm 8 holes.
Flange size three: outer diameter 230mm center distance (eye distance) 200mm 8 holes.
JIS-5K: outer diameter 235mm center distance (eye distance) 200mm 8 hole.
JIS-10K: outer diameter 250mm center distance (eye distance) 210mm 8 hole.
DIN-16K: outer diameter 250mm center distance (eye distance) 210mm 8 hole.

DN350's buoy type water tank, air pipe head / buoy water tank breathable cap, and the size of its flange can be selected as follows:

Flange size 1: outer diameter 480mm center distance (eye distance) 436mm 16 hole.
Flange size two: outer diameter 490mm center distance (eye distance) 445mm 12 holes.
Flange size three: outer diameter 505mm center distance (eye distance) 460mm 16 holes.
JIS-5K: outer diameter 480mm center distance (eye distance) 435mm 12 hole.
JIS-10K: outer diameter 490mm center distance (eye distance) 445mm 16 hole.
DIN-16K: outer diameter 520mm center distance (eye distance) 470mm 16 hole.

Finally, we choose what materials to make marine air pipe / marine breathable caps.

HT200- flange cast iron air pipe head, flange cast iron breathable cap.
QT400-15 ductile iron air pipe head and nodular cast iron breathable cap.
SUS304 stainless steel breathable cap, stainless steel air pipe head, stainless steel air cap.