SINGLE MAIN FIREMAIN SYSTEM--Consists of
SHIP'S DRAWING INDEX (SDI)--The SDI is kept
in the engineering department office (log room).
a single piping run that extends fore and aft. This
The SDI lists all working drawings that have a
type of firemain is generally installed near the
NAVSHIPS or NAVSEA drawing number, all
centerline of the ship, extending forward and aft as
manufacturer's drawings, all equipment drawing
far as necessary.
lists, and all assembly drawings that list detail
SKIN DOSE--Radiation from a source outside the
body, possibly on the skin, that can damage the skin.
SHIPBOARD TRAINING TEAMS--Training teams
SMOKE CONTROL ZONE--The area between the
include a core group of the most knowledgeable and
experienced personnel from the ship. The size of the
fires that involve primarily class ALPHA or class
crew, number of qualified personnel, complexity of
the exercise, and safety requirements will influence
the size of the team.
SOFT PATCH--A patch used to repair small holes or
SHIP'S GENERAL ANNOUNCING SYSTEM
cracks in low-pressure (150 psi) piping.
( 1 M C C I R C U I T ) -- T h e s h i p 's g e n e r a l
S O L E N O I D - O P E R AT E D P I L O T VA LV E
announcing system used to pass information to the
(SOPV)--Electrically operated pilot valves that
ship's crew on a regular basis each day. It is also
c o n t r o l t h e a c t iva t i o n o f m a ny A F F F
another means of damage control communication
fire-extinguishing systems. All SOPVs (master and
because information can be passed throughout the
service) have four control line ports; one port is
ship. The 1MC system should be used only to pass
always connected to supply pressure (firemain),
warnings or vital information that affects the entire
and a second port is the valve drain (which should
be piped to discharge within the coaming of the
SHIP'S SERVICE TELEPHONES--Telephones for
telephones installed at or near repair party lockers.
STABILITY CURVES--When a series of values for
The ship's service telephones are standard
GZ (the ship's righting arm) at successive angles of
heel are plotted on a graph, the result is a stability
curve, also called the curve of static stability.
SHIPS' DRAFT--The vertical distance from the keel
to the waterline.
S TA N D B Y P E R S O N -- T h e p e r s o n t r a i n e d i n
emergency rescue procedures assigned to remain
SHOLE--A flat block that may be placed under the end
of a shore to distribute pressure.
on the outside of the confined space and to be in
communication with those working inside.
SHORE--A portable beam.
S TAT I C OV E R P R E S S U R E -- A s u d d e n , n o n -
SHORT-TERM EXPOSURE LIMIT (STEL)--The
directional increase in air pressure caused by the
maximum concentration of a substance to which
passage of the air blast wave from a nuclear burst.
personnel can be exposed for up to 15 minutes
without significant physiological effects (i.e.,
STEAM BLANKETING--A method for making the
irritation, narcosis, impairment of self-rescue),
provided that no more than four exposures per day
using steam to displace and carry off flammable
are permitted and at least 60 minutes elapses
vapor/air mixtures within a space.
between exposure periods.
STORAGE--The holding of HM or HW for a
SHORT-TERM LETHAL CONCENTRATION
temporary period, after which time the HM is used
(STLC)--A concentration of a substance that is
or stored elsewhere, or the HW is treated, disposed
lethal within 10 minutes of exposure.
of, or stored elsewhere.
SINE--In trigonometry, angles are represented by the
STRAKES--The hull plating fastened to the
Greek letter theta (θ). The sine of an angle θ,
framework in longitudinal rows.
abbreviated as sin θ, is the ratio expressed when the
side of a right triangle opposite the angle θ is
STRENGTH DECK--Deck designed to carry not
only deck loads on it but also the hull stresses.