Bureau of Ships,
of Bureau of Ships
Oueninrs." dated 1
This revised chapter becomes effective upon re-
ceipt and shall be inserted in its proper place in
the Manual Binder.
DI). H. CLARK,
U. S. N.,
FRANCIS P. MATTHEWS,
Secretary of the Navy.
Digitized by the Internet Archive
with funding from
University of Florida, George A. Smathers Libraries with support from LYRASIS and the Sloan Foundation
16-1. INSPECTION AND MAINTENANCE OF CLOSURES
The following procedure should be followed in
to the inspection
of the vessel.
as dogs, dog bolts, nuts, hinges, etc.,
with emery paper or other abrasives
as this destroys the zinc coating and accelerates
(a) Wipe off all dirt,
and foreign matter
with a wiping cloth, dampened if necessary with
carbon tetrachloride or kerosene.
(b) Scrape rust off all parts of closure.
(c) Clean contact surface only of dog and dog
wedge with steel wool and wipe both surfaces with
an oily cloth, leaving
a thin film of oil for lubrica-
(d) Clean rust and paint off knife edge contact
surface with 00 emery cloth.
(e) Remove all paint and rust from rubber gasket.
It should be clean and pliable.
If gasket requires
Gasket material is available in standard
(f) Examine all moving parts for
install replacement parts.
For quick-acting doors, consult manufacturer's in-
struction book in this regard.
(g) Operate closure and check for smooth and
positive dogging action.
(h) Check compression between knife edge and
rubber gasket and adjust if necessary.
(i) Lubricate teeth of gear sectors, racks, pinions,
ratchets, pawls, cranks, etc., of quick-acting closures.
(j) Repack dog and operating lever or handwheel
spindles with packing, N. D. Spec. 33P29, symbol
This material is available in standard stock.
as necessary, being careful not to
apply paint to gasket or knife edge.
16-2. DOGS, PINS, ETC., NOT TO BE REMOVED
The dogs, dog bolts, nuts, hinges, and hinge pins
or other parts of watertight doors, hatches, man-
holes, and air ports upon which the watertight se-
curity of vessels depends shall not be removed except
for the purpose of repair or adjustment.
moval of these parts for other purposes, such as
cleaning or pohlishing, or for making access temporar-
ily more convenient, is prohibited, as this practice
often results in the loss of the parts or results in
their replacement without being correctly adjusted,.
thereby introducing a menace to the watertight
16-3. THREADS OF DOG BOLTS NOT TO BE FILED
The threads of dog bolts shall not be polished with
files, emery, or sandpaper, as this practice in time
the threads causing
the bolts and nuts.
a loose fit between
Composition and corrosion-
resisting steel bolts require only wiping occasionally
with an oily rag or waste.
and slightly slushed with he
Steel bolts, if kept clean
will not rust.
16-4. GASKETS NOT TO BE PAINTED
The foregoing instructions in regard to avoiding
use of paint on gaskets apply also to gaskets as used
in manholes and hatches for oiltight purposes. In
setting up oiltight gaskets, care should be taken to
see that these are in suitable condition for obtaining
If replacement of gaskets is required,
replace with material specified in chapter 95.
16-5. PRECAUTIONS IN CLOSING DOORS. ETC.
When setting up dogs on watertight doors, hatches,
etc., a dog on the opposite side from the hinges
should first be set up with sufficient pressure to hold
the door, hatch, etc., closed.
Two dogs should then
be set up snugly on the hinge side, after which all
the dogs should be set up evenly to insure a bearing
doors, hatches, etc., those dogs nearest the hinges
should be loosened first; this prevents the door from
springing and makes it easier to operate the remain-
16-6. TIGHTENING DOOR DOGS
If the door, hatch, etc., are in good condition, it
should only be necessary to have an even bearing all
around in order to obtain tightness.
should be obtained by setting up dogs firmly and
evenly all around, beginning as instructed above.
Dogs should not be driven down. The necessary
tightness should be obtained by setting up a little on
one after the other, successively, until all are down