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A roof that is nearly flat and without parapet walls.



Related Terms

DECK BEAM

An athwartship horizontal structural member supporting a flat or deck

BILGE BRACKET

A vertical transverse flat plate welded to the tank top or margin plate and to the frame in the area of the bilge.

CENTER GIRDER

A vertical plate on the ship's centerline between the flat keel and inner bottom extending the length of the ship. Also called center vertical keel, CVK. Or center keelson.

CENTER KEELSON

A vertical plate on the ship's centerline between the flat keel and inner bottom extending the length of the ship. Also called center vertical keel, CVK. Or center keelson.

CENTER VERTICAL KEEL

A vertical plate on the ship's centerline between the flat keel and inner bottom extending the length of the ship. Also called center vertical keel, CVK. Or center keelson.

HATCH BATTENS

Flat bars which are wedged against hatch coamings to secure tarpaulin

TRIPPING BRACKET

Flat bars or plates fitted at various points on deck girders, stiffeners, or beams as reinforcements to prevent their free flanges from tripping

BOILER HEADER (BOX)

A pressure part of the boiler consisting of a flat tube sheet into which the ends of the water tubes are rolled. In a parallel plane is a tube cap or handhole sheet. The two sheets are spaced about 4 to 8 in. or more apart. The top and bottom and both ends are flanged together and riveted or may be closed by a narrow flanged strip of plate riveted to each sheet. Circulating nipples connect the top of the header and drum, or the header may be flanged and riveted directly to the drum. Welding would be used today instead of rivets.

GAUGE GLASS

A glass-enclosed visible indicator of the water level in a boiler. Many gauge glasses are tubular, but modern high-pressure practice and railroad locomotives use two thick, flat strips of glass bolted between flanged plates, with the water and steam between the glass strips.

BASELINE

A fore-and-aft reference line at the upper surface of the flat plate keel at the centerline for flush shell plated vessels. Vertical dimensions are measured from a horizontal plane through the baseline, often called the molded baseline.

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