secure the air-port frame to the workbench, you will be
packing to remain in the stuffing tube, you will have
able to unscrew the retaining ring. After you remove the
provided a means for progressive flooding to take place.
old glass lens, clean the threads of the frame and the
retaining ring. If the frame and ring are made of
grease to the threads. Before you insert a new glass,
embed the edges of the glass in red lead putty or another
approved material. When you secure the retaining ring,
the putty is forced out evenly all-around the glass lens,
thereby ensuring a tight fit.
Safety is a major concern in whatever you do.
Figure 3-15. Cable penetration through watertight bulkhead.
When opening a closure, you can protect yourself by
standing on the opposite side from the hinges and
loosening the dogs nearest the hinge first. You will then
find it easier to loosen the other dogs, and the door will
not hurt you if there is an explosion within the
compartment. The hinges help to keep the door from
blowing open. If you are on the hinge side of the door
when an explosion occurs, you will be caught between
the door and the bulkhead.
Each closure has a safety device. Some hatches have
stanchions; others have locking latches. Both devices
use toggle pins to secure them in place. Be sure that the
END PACKING ASSEMBLY
toggle pins are in place at all times when the hatch is
open. Watertight scuttles have a safety device known as
a bracing link assembly. Make sure that the bracing link
assembly is in good operating condition at all times.
When exiting a compartment through a scuttle, do not
Figure 3-16. Multi-cable transit frame.
grab hold of the scuttle to pull yourself through. If the
bracing link assembly fails to lock, the scuttle will fall
Leakage can occur where pipes pass through
on your head or fingers, causing considerable injury. A
bulkheads and decks. Various methods are used to
door catch is installed for each shipboard door. When a
make the penetration points watertight. Watertight
door is to be left open for a period of time, use the door
penetration points reduce the chance of progressive
catch. The movement of the ship could cause the door to
slam shut. A door slamming shut will damage the door's
Air-port covers operate basically the same as doors
gasket and could seriously injure a person. Most
and hatches. You might need to tighten up the dogs on
personnel injuries are not caused by the closure's
the air-port covers. If the dogs are not tight, the glass
design, but rather by an individual's carelessness.
lenses of the air port can be broken by heavy seas or by
the movement of the ship. When you secure an air-port
cover, be sure to bring the hinge pin of the cover all the
way out to the end of the hinge. By doing this, you can
What type of door provides access to a
avoid the possibility of breaking the cover.
compartment that is not often used?
To replace the glass lens, drill and tap holes in the
Lightweight aluminum door
workbench top. These holes will need to be the same
size as the holding bolts that are fitted through the
Quick-acting watertight door
securing lugs of the air-port frame. By drilling and
Raised watertight hatch with scuttle
tapping these holes, you will save a considerable
Individually dogged watertight door
amount of time when replacing the glass lens. Once you