Light Marine Porthole

 Marine Porthole

  • Light Marine Porthole
Light Marine Porthole

Light Marine Porthole

  • Product description: Light Marine Porthole install on the bulkhead deck or freeboard deck first layer and above superstructure both side and afterward.
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Light Marine Porthole

Porthole is installed in the shipboard plates, superstructure and deck outdoor wall, on the hull of ship, can ensure the hull tightness, round window with anti-storm performance. Ship portholes reason are designed into round, according to the principle of mechanics, circular than other shapes more under pressure, shear stress.

Light portholes are generally not associated with deadlights. Watertight bearing capacity of light porthole 20Pa below.

The installation position of porthole according to the anti-sinking ability of ships. Light pothole install on the bulkhead deck or freeboard deck first layer and above superstructure both side and afterward. Non passenger ship freeboard deck first layer superstructure bulwark both side and afterward.


type D D1 D3 D4 D5 h t α whorl qty opening
C LRB 200 245 250 350 310 155 6 45° M12 8 253
250 295 305 400 364 182 6 42° M16 8 308
300 350 355 450 414 207 8 31° M16 12 363
350 400 410 500 464 232 8 32° M16 12 413
400 450 460 550 514 257 10 31° M18 12 463
450 500 510 600 564 282 10 31° M20 12 513


type D D3 D4 D5 h t α whorl bolts opening
C NB 200 250 350 310 155 6 45° M12 8 253
250 305 400 364 182 6 42° M16 8 308
300 355 450 414 207 8 31° M16 12 363
350 410 500 464 232 8 32° M16 12 413
400 460 550 514 257 10 31° M18 12 463
450 510 600 564 282 10 31° M20 12 513


type D D1 D3 h t α gmax bolts opening
C LRW 200 245 250 155 6 45° 50 3 253
250 295 305 182 6 42° 47.5 3 308
300 350 355 207 8 31° 45 3 363
350 400 410 232 8 32° 45 3 413
400 450 460 257 10 31° 45 3 463
450 500 510 282 10 31° 45 4 513