- R & D:
- Reamed and Drifted. Pipe commonly used in water wells having a special, heavy-duty coupling and a guaranteed I. D. clearance.
- 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.
- Rated Storage Volume:
- Quantity of water stored in a tank.
- Raw Water:
- Water supplied to the plant before any treatment.
- Reamer:
- A grinding tool used to level or remove burrs from valve seats in faucets so that the valve stem will fit properly.
- Receptor:
- Shallow basin used to catch and contain water in the bottom of a showering space.
- Recessed Tub:
- A tub that has a decorative finish on one side only and is surrounded by three walls.
- Recirculating Harness:
- PVC tubing setup that circulates water throughout a whirlpool system, delivering water to the jets.
- Recovery:
- The amount of water in gallons that can be heated in one hour (gph).
- Recovery Capacity:
- The amount of water in gallons per hour raised 100 degrees F at a given thermal efficiency and BTU per hour input.
- Red Water:
- Water which has a reddish or brownish appearance due to the presence of precipitated iron and/or iron bacteria.
- Redox:
- Term referring to the reduction-oxidization potential of water. Redox tells how easily chemical reactions are taking place in a tank. A high redox value is better
than a low one.
- Reducer:
- A fitting that connects pipes of different sizes together.
- 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.
- Refill Tube:
- Outlet of water control. It is what the water goes through to fill the tank.
- Reflective Glass:
- Glass that bounces back at least some of the light that strikes it.
- Relief Valve:
- A valve that opens to relieve excess temperature.
- Repair Clamp:
- Sleeve type clamp used to repair a split pipe, held in place by bolt.
- Residential:
- Water heaters for single family dwellings.
- Residual Chlorine:
- Chlorine remaining in treated water after a specified period of contact time to provide continued protection throughout a distribution system; the difference
between the total chlorine added, and that consumed by the oxidizable matter.
- Return Circulation System:
- 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.
- Revent:
- Pipe installed specifically to vent a fixture trap. Connects with the vent system above the fixture.
- Reverse Osmosis:
- A water treatment method whereby water is forced through a semi permeable membrane which filters out impurities.
- Reverse Trap Water Closet:
- 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 1-1/2" ball pass.
- RF:
- Recovery Factor - Rating based on the efficiency of the product which is input required to raise 1 gallon of water 1 degree Fahrenheit.
- RH:
- Right Hand.
- Rich Mixture:
- A mixture of gas and air containing too much fuel or too little air for complete combustion of the gas.
- 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.
- Rim:
- The inside edge of the perimeter of a toilet bowl. The lower portion of a toilet seat. The edge of a sink or lavatory.
- 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.
- Riser:
- A vertical metal or plastic tube or assembly that connects a faucet to the water supply stop valve. Usually made of copper.
- Roller Hanger:
- A pipe hanger similar to a clevis hanger except that the yoke bolts to a roller rod instead of a metal strap. The roller rod supports the pipe and permits horizontal movement.
- Roman Tub Set:
- A roman tub set is a tub set that is mounted on the deck of a tub not on the wall.
- Roman Spout:
- Term used to describe a faucet that is mounted on the deck of the bathtub enclosure, that than on the rim of the bathtub or on the wall. Also referred to as a
deck-mount faucet.
- Roof Drain:
- A drain installed at the low spot in a roof that channels water into a drainpipe to prevent pooling.
- Roof Flashing:
- Sheet metal installed at any break in a shingled roofline to prevent leaks. Also around sewer vents, flue pipes.
- 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.
- Rough-In:
- Installation of the drain, waste, vent, and supply lines in a structure to the proposed location of each fixture.
- 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.
- Round Front Bowl:
- Standard shape of the front of a toilet bowl.
- Run:
- A complete or secondary section of pipe that extends from supply to fixture or drain to stack.
- Running Trap:
- An in-line trap mounted in a horizontal drainpipe, where the inlet and outlet are parallel.
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