|
Boiler glossary R |
|
| |
||
| RANKINE CYCLE -- A composite steam plant
cycle used as a standard of efficiency, comprising introduction of water by a
pump to boiler pressure, evaporation, adiabatic expansion to condenser
pressure, and condensation to the initial point. RANKINE SCALE-- Absolute scale of temperature, based on degrees Fahrenheit. RAW WATER -- Water supplied to the plant before any treatment. REACTION TURBINE -- A turbine in which the fluid expands progressively in passing alternate rows of fixed and moving blades, the kinetic energy continuously developed being absorbed by the latter. RECIPROCATING ENGINE -- Any engine which employs a piston working in a cylinder, the piston being caused to oscillate by the periodic pressure of the working fluid. REDUCING VALVE -- The reducing valve will give a constant reduced pressure irrespective of any fluctuation in the inlet pressure provided that the latter does not fall below the desired reduced pressure. REFRACTORY-- Any solid ceramic material suitable as a structural or protective material at high temperatures in a corrosive environment. RELIEF VALVE -- A spring loaded valve that automatically opens when pressure attains the valve setting. Used to prevent excessive pressure from building up in a boiler. RESIDUAL FUEL OIL-- Heavy, thick substance, such as No.6 oil, left over from the distillation of petroleum. RESUPERHEATING -- The process of passing steam, which has been partially expanded in a steam turbine, back to a superheater before subjecting it to further expansion RETORT-- The central trough into which coal is fed in certain types of boilers. RISERS -- Tubes in which steam is generated due to high convection or radiant heat. The water-steam emulsion rises in these tubes toward the steam drum. RMS -- Royal Mail Steamer. ROTARY CUP BURNER -- A burner in which atomization is accomplished by feeding oil to the inside of a rapidly rotating cup. RUTHS ACCUMULATOR -- A steam accumulator of variable pressure type for smoothing fluctuations or demand on a boiler. It consists of a large insulated vessel containing water into which steam is injected at a high pressure, to be liberated later when the pressure is reduced. |
© 2007 Lars Josefsson Boilers