Explain Plain Bulkhead And Corrugated Bulkhead

 According to construction there are 2 type of bulkhead,

  > Plain bulkhead

  > Corrugated bulkhead

Plain Bulkhead

> Plain bulkheads consist of plates stiffened by rolled sections such as bulb plates and angles spaced approximately 760mm apart.

 > The thickness of the plates are generally thickest at the bottom because of the maximum hydrostatic pressure experienced there, and thinnest at the top and generally not less than 6.5 mm thick.  The plates of the bulkhead are laid in a horizontal direction.

 > Where the depth of the bulkhead is great, horizontal stringers or girders are fitted as well as vertical girders with face plate and tripping brackets.

Corrugated bulkheads

> A corrugated plate is stronger than a flat plate if subject to a bending moment or pillar load along the corrugations.

 > Corrugations (or swedges) are formed on a corrugated bulkhead to eliminate the need to fit the vertical stiffener, as in those of the plain bulkhead.

 > A corrugated plate is stronger than a flat plate without stiffening if subject to bending moment or a pillar load along the corrugations.

 > The elimination of vertical stiffeners also results in saving in steel weight and cost of stiffeners.

 > The angle of corrugation is normally about 45 degrees.

 > The troughs are vertical on transverse bulkheads but must be horizontal on continuous longitudinal bulkheads, which form part of the longitudinal strength of the ship.

 > Diaphragm plates or horizontal stringers are fitted on the bulkhead to keep the corrugation in place.

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