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TERM
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EXPLANATION
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R & D |
Reamed and Drifted. Pipe commonly
used in water wells having a special, heavy-duty coupling and a guaranteed
I.D. clearance. |
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RF |
Recovery Factor - Rating based
on the efficiency of the product which is input required to raise 1 gallon
of water 1 degree Fahrenheit. |
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Rail Fittings |
Fittings with setscrews rather than threads,
which hold pipes used for hand railings. Available in various sizes and
configurations to suit a number of applications. Not used for plumbing
or conduit. |
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Rated Storage |
Volume Quantity of water stored in a tank.
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Raw Water |
Water supplied to the plant before any treatment.
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Reamer |
A grinding tool used to level or remove burrs
from valve seats in faucets so that the valve stem will fit properly.
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Recessed Tub |
A tub that has a decorative finish on one
side only, and surrounded by three walls. The apron, or skirting, may
not be included and must be ordered separately. The most popular style.
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Recirculating Harness |
PVC tubing setup that circulates water throughout
a whirlpool system, delivering water to the jets. |
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Recovery |
The amount of water in gallons that can be
heated in one hour. (gph). |
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Recovery Capacity |
The amount of water in gallons per hour raised
100 degrees F at a given thermal efficiency and BTU per hour input.
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Red Water |
Water which has a reddish or brownish appearance
due to the presence of precipitated iron and/or iron bacteria. |
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Reducer |
A fitting that connects pipes of different
sizes together. |
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Reed Switch |
A serviceable, magnetic sensing switch that
triggers the water flow to stop when the neck jet pillow (with magnet)
is removed from the whirlpool. |
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Refill Tube |
The tube that directs water from a ballcock
into the overflow tube to refill the bowl after a siphon break. |
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Relief Valve |
A valve that opens to relieve excess temperature.
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Repair Clamp |
Sleeve type clamp used to repair a split pipe,
held in place by bolts. |
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Return Circulation System
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Tempered water from or near the point of usage
which eliminates waste of hot water used for long runs and adds storage
to the system. |
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Revent |
Pipe installed specifically to vent a fixture
trap. Connects with the vent system above the fixture. |
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Reverse Osmosis |
A water treatment method whereby water is
forced through a semi permeable membrane which filters out impurities.
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Reverse Trap Water Closet
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A water closet having a siphonic trapway at
the rear of the bowl, and integral flushing rim and jet. Min. dimensions
are 9" x 8" water spot and 1 ½" ball pass. |
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Rigid Pipe |
Pipe designed to transmit the backfill load
to the foundation beneath the pipe. Rigid pipe must be supported on the
bottom portion of the pipe |
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Rim Holes |
A series of small holes in the underside of
a toilet rim, around the circumference of the bowl. Incoming water flows
down into the bowl through these holes, creating a rinse effect or wash
over the entire inner surface of the bowl. |
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Riser |
A vertical metal or plastic tube or assembly
that connects a faucet to the water supply stop valve. Usually made of
copper. Metal Flex Risers are corrugated to facilitate bending. Also a
supply line that rises from one story to the next. |
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Residual Chlorine |
Chlorine Chlorine remaining in treated water
after a specified period of contact time to provide continuing protection
throughout a distribution system; the difference between the total chlorine
added, and that consumed by oxidizable matter. |
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Roller Hanger |
A pipe hanger similar to a clevis hanger except
that the yoke bolts to a roller rod instead of a metal strap. This roller
rod supports the pipe and permits horizontal movement. |
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Roman Spout |
Deck-mounted faucet spout. |
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Roof Drain |
A drain installed at the low spot in a roof
that channels water into a drainpipe to prevent pooling. |
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Roof Flashing |
Sheet metal installed at any break in a shingled
roofline to prevent leaks. Also around sewer vents, fluepipes.
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Root Valve |
A multi-port valve commonly used on gauges
or switches in high pressure, high temperature, or under otherwise severe
process conditions. Typically built with non-rotating and non-threaded
stems. |
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Rough-In |
Installation of the drain, waste, vent, and
supply lines in a structure to the proposed location of each fixture.
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Rough-In Dimensions |
The distance from a finished wall or floor
to the center of the waste or supply opening or mounting holes on a plumbing
fixture. |
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Round Front Bowl |
Standard shape of the front of a toilet bow,
having dimensions of 14" wide by 16 ½" long from center of seat hinge
holes to front outside rim edge. |
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Run |
A complete or secondary section of pipe that
extends from supply to fixture or drain to stack. |
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Running Trap |
An in-line trap mounted in a horizontal drainpipe,
where the inlet and outlet are parallel. |
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