Page 208 - Ship Construction.DJ Eyres 6Ed

Ch18-H8070.fm Page 197 Wednesday, October 18, 2006 6:58 AM
Bulkheads and Pillars 197

Shedder
Plan plate

Shedder้น---
Corrugated
transverse
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
bulkhead
Elevation
--- ใช้เพื่อการศึกษาเท่านั

plate

Bulkhead
stool

Tank top
ึ Transverse

floors

Bottom shell

FIGURE 18.3 Bulk carrier – Bulkhead stool
water to the level of the load waterline. All bulkheads, unless they form the
boundaries of a tank which is regularly subject to a head of liquid, are
hose tested. Since it is not considered prudent to test ordinary watertight
bulkheads by filling a cargo hold, the hose test is considered satisfactory.

Watertight Doors

In order to maintain the efficiency of a watertight bulkhead it is desirable
that it remains intact. However in some instances it becomes necessary to
provide access between compartments on either side of a watertight bulk-
head and watertight doors are fitted for this purpose. A particular example
of this in cargo ships is the direct means of access required between
the engine room and the shaft tunnel. In passenger ships watertight doors
are more frequently found where they allow passengers to pass between
one point of the accommodation and another.