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Boiler glossary P |
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| PANTING -- Pulsating movement in a burner. Panting might occur when
the burner operates with a considerable deficiency of air. Decrease the fuel
supply slowly. Panting may also depend on too high oil temperature that causes vaporization in the burner tip. PACKAGE BOILER -- A boiler equipped and shipped complete with fuel burning equipment, mechanical draft equipment, automatic controls, and accessories. PARAFFINIC HYDROCARBONS -- Straight-chain hydrocarbon compounds with the general formula CnH2n+2 e.g., Propane = C3H8 PARSON'S STEAM TURBINE -- A reaction turbine in which rings of moving blades of increasing size are arranged along the periphery of a drum of increasing diameter. Fixed blades in the casing alternate with the blade rings. Steam expands gradually through the blading, from inlet pressure at the smallest section to condenser pressure at the end. PERFECT COMBUSTION -- Stoichiometric combustion. The complete oxidation of all the combustible constituents of a fuel, utilizing all the oxygen supplied. pH VALUE -- A logarithmic index for the hydrogen ion concentration in an aqueous solution. Used as a measure of acidity of a solution; given pH = log10 (1/[H+]), where [H+ ] is the hydrogen ion concentration. A pH below 7 indicates acidity, and one above 7 alkalinity. PILOT BURNER -- A flame which is utilized to ignite the fuel at the main burner or burners. PINCH POINT TEMPERATURE -- It is the difference between the temperature of the gas leaving the evaporating section in the boiler and the saturation temperature corresponding to the steam pressure in the evaporator tubes. PITOT TUBE -- An instrument that will register total pressure and static pressure in a gas stream, used to determine its velocity. PITTING -- Corrosion of metal surfaces due to local chemical actions. PNEUMATIC SYSTEM -- A compressed air system, used commonly for controls. POST PURGE -- A method of scavenging the furnace passes to remove all combustible gases befor ignition of the main burner. PREHEATED AIR -- Air at a temperature exceeding that of the ambient air. PRESSURE RELIEF VALVE -- Safety valve. A device mounted on a boiler, which is designed to release any high steam pressure and thus prevent boiler explosions. PRIMING -- The delivery of steam containing water in suspension, due to violent ebullition or frothing. PROCESS STEAM -- Steam used for industrial purposes other than for producing power. PRODUCTS OF COMBUSTION -- The gases, vapors, and solids resulting form the combustion of fuel. PS -- Paddle Steamer. PYROMETER -- An electrical thermometer for measuring high temperatures. POST PURGE -- A method of scavenging the furnace passes to remove all combustible gases befor ignition of the main burner. PREHEATED AIR -- Air at a temperature exceeding that of the ambient air. PRESSURE RELIEF VALVE -- Safety valve. A device mounted on a boiler, which is designed to release any high steam pressure and thus prevent boiler explosions. PRIMING -- The delivery of steam containing water in suspension, due to violent ebullition or frothing. PROCESS STEAM -- Steam used for industrial purposes other than for producing power. PRODUCTS OF COMBUSTION -- The gases, vapors, and solids resulting form the combustion of fuel. PYROMETER -- An electrical thermometer for measuring high temperatures. |
© 2007 Lars Josefsson Boilers