2016年2月26日星期五

Marine Window, Porthole



Marine Rectangular Window

Location: a rectangular window is arranged in a second level building, as square and rectangular window for light or ventilation.
Structure: inner side open type, outside open type, inside open type, drop type and fixed type, etc., under pressure is less than 5m water column (the larger transparent size the lower pressure resistant .)

The rectangular window is arranged on the wall of the upper deck superstructure. rectangular window of the periphery with a rubber seal, close with the bolt pressed, the requirements to ensure weathertight.
Rectangular window according to the size of the rib spacing with a suitable window, the other to consider is water tight pressure. Transparent size 400mm x 300mm can bear 50Pa pressure, 350mm x 50mm, 400mm x 550mm, 450mm x 600mm can be confined to 20Pa. In the superstructure of the general compartment window, the large size of the (550mm x 600mm, 600mm x 700mm, 800mm x 900mm) window is used to request a wide driving room.


Welded window
1.    Dimension of wall opening:W1*H1*R1
2.    Hose test shall be carried out as follow,hose nozzle diameter: >16 hosing distance from window 2.5-3m, water pressure 0.2Mpa after maintain the pressure fro 3 minutes no water mark could be found on the back of window
3.    Both side of glass to be applied with removable plastic lamina
4.    Half-round head bolts GB67-76 may be used for item
5.    During installing the gap between window frame and wall as wall as the gap in way of bolt hole to be filled with putty.

Fixed window
1.    the steel part shall CB*/Z343 hot-dip processing , leaching layer thickness of not less than 45um, aluminum oxide plate blasting quality
2.    flush test requiment: Nozzle diameter greater than 12.5mm, flushing distance: 1.5m ,nozzle water pressure:0.25 Mpa
3.    In according to all other requirement refer ISO3903: 1993 shipbuilding and marine sturctures, marine ordinary recangluar window standard

4.    After the steel main frame sand-blasting spit twice primer, color is gray


Marine Porthole

Install in the side plates, the superstructure deck and outdoor wall , on the hull of the ship, can ensure the hull tightness, Round window with anti storm performance.

Ship's portholes reason are designed into round, according to the principle of mechanics, circular than other shapes more under pressure, shear stress. The installation position of porthole according to insubmersibility of ship.
Classify into heavy and light type. Heavy porthole inboard hinge cover anti wave porthole. Deadlights side with rubber seals, tightly pressed by the bolt to keep watertight. Light portholes are generally not associated with deadlights. In the spaces below the freeboard deck or enclosed superstructure premises portholes were all severe side scuttle.

Portholes fixed type and movable type, the former can not be opened, which can be opened, at watertight bearing capacity of heavy 20Pa, ordinary type 50~100Pa, light (20Pa below). Heavy movable portholes stone in a watertight region in the window, cap with a riot, such a window in stormy weather cannot keep lighting. For circular porthole, specifications with transparent glass diameter usually & Oslash; 200mm, & Oslash 250mm, 300mm & Oslash;, & Oslash 350mm, & Oslash 400mm several, depending on the vessel size (rib spacing selection. As the exit must be more than 350mm.

1.    side scuttle part surface should level bright and clean,surface its rough degrees of Ra should be greater than 12.5um,mould forging surface can’t have crackle,divide into layer,burn etc and forge the defect,casting surface
2.    there can’t be the defects of sand holes,air vent,crackle,loose and intensity of other influence
3.    The windowpane of side ship must adopt the safety glass that GB11946,there should be certificate of competency.Surface of glass both side should be stuck and can shell the membrance.
4.    side scuttle steel part should soak the zinc to deal with according to GB/TZ343 heat it is not smaller than 45um to soak one layer of thickness,the aluminium part should oxidize dealing with according to GB/TZ92,the surface is unglazed and silivery white

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