PIPE BEND--A bent pipe, as distinguished from a
balance of the pipe. It may also be used to signify
bend in a piping system where the bend is made by
a fitting that accomplishes this purpose.
means of a fitting.
OLD MAN--A heavy bar of iron or steel bent in the
PIPE BENDING MACHINE--A device for coiling
form of a Z and used to hold a portable drill. One
or bending pipe of any ductile metal. The bending
leg is bolted or clamped to the work to be drilled
is done by the use of formers and saddles.
and the drill head is placed under the other leg,
However, where the pipe wall is relatively thin, it
which holds the drill to its work
may be necessary to use internal mandrels to
OPERATING GEAR--A system of rods with
prevent buckling or collapse of the pipe wall.
universal joints and couplings connecting to valves,
PIPE CLAMP--A joint support fitted with a clamp on
which may be set at particular angles to fit
each end, connected laterally with four short pieces
conditions. The system extends to points above the
of flat bar. These clamps are used for holding
deck and provides a means of operating the valves
butt-welded and sleeve-welded joints together until
by remote control.
they have been tacked.
PACKING--A yielding material employed to effect a
PIPE COUPLING--A cylindrical sleeve or socket
tight joint or to pack the stuffing boxes of valves.
with female threads designed to receive the ends of
The material may be sheet rubber or braided hemp.
two adjacent pipe lengths.
For joints that must allow considerable or incessant
PIPE COVERING--A jacket of nonconducting
motion, metallic rings are used as packing.
material placed around the piping of a steam or
PAD EYE--A fitting having one or more eyes integral
other hot system to prevent the loss of heat.
with a plate or base to provide ample means of
PIPE CUTTER--A device for cutting pipe. The
securing and to distribute the strain over a wide
common type consists of a hook-shaped frame with
area. The eyes may be either "worked" or
a movable slide upon a stem, and another slide upon
"shackled". They are also known as lug pads or
which cutting disks are mounted. As the appliance
is rotated about the pipe, the cutting edges are
PEEN-- (l) The lesser head of a hammer. This part is
forced into the metal.
called "ball" when it is spherical, "cross" when it is
PIPE DIE--A tool for cutting external threads on pipe.
in the form of a ridge at right angles to the axis of
(Internal threads are cut with a tap.)
the handle, and "straight" when it is like a ridge in
the plane of the handle. (2) To round off or shape
PIPE DOPE--Materials used on the threads of
an object, smoothing out burrs and rough edges.
screwed pipe joints. There are many such
compounds available under a variety of trade
PEENED FLANGE JOINT--A term used to indicate
that the flanges are attached to the pipe by peening,
rather than by screwing, riveting, or welding.
PIPE FITTINGS--Connections, appliances, and
various designs of adjuncts used in connection with
PEENING-- The act or process of hammering sheet
pipes. Examples are elbows and bends that alter
metal with the peen of a hammer, either to
directing of flow, tees and crosses to connect
straighten or to impart a required curvature.
branches with a main, plugs and caps to close an
PERFORATED-- A term used to describe a surface in
end, and bushings and reducers to couple pipes of
which holes have been bored, drilled, punched, or
PIPE HANGER--A suspension link or band used to
PERPENDICULAR-- Vertical lines extending
support a pipe without interfering with its
through the outlines of the hull ends and the
expansion and contraction.
PIPELINE--A run of pipe used for transporting
PET COCK--A small cock used to drain a cylinder,
liquids and gases.
fitting, and related parts.
PIPE THREAD--A thread employed in connection
with pipe. The standard thread has an included
PIPE-- A hollow cylinder made of metal, plastic, or
other materials, used for the conveyance of fluids
angle of 60 degrees between sides, is slightly
rounded at top and bottom, and is tapered. Threads