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A-B-C

A ABSOLUTE PRESSURE – Pressure above zero pressure; the sum of the gauge and atmospheric pressures. ACCUMULATOR – (STEAM) A pressure vessel containing water and/or steam, which is used to store the heat of steam for use at a late period and at some lower pressure. ACID CLEANING – The process of cleaning the interior …

D-E

D DAMPER – A device for introducing a variable pressure drop in a system used for regulating the volumetric flow of a gas, such as air. DAVIT – The structure on large firetube boilers from which the front and rear doors are suspended when opened. DEAERATION – Removal of air and gases from boiler feed …

F

F FAN – A machine consisting of a rotor and housing for moving air or gases at relatively low pressure differentials. FAN PERFORMANCE – A measure of fan operation in terms of volume, total pressures, static pressures, speed, power input, mechanical and static efficiency, at a stated air density. FAN PERFORMANCE CURVES – The graphical …

G

G GAS ANALYSIS – The determination of the constituents of a gaseous mixture. GAS BURNER – A burner that uses gas or fuel. GAS PRESSURE REGULATOR – A spring loaded, dead weighted or pressure balanced device which will maintain the gas pressure to the burner supply line. GAUGE COCK – A valve attached to a …

H HANDHOLE – An access opening in a pressure part usually not exceeding 6Ó in its longest dimension. HANDHOLE COVER – A handhole closure. HARDNESS – A measure of the amount of calcium and magnesium salts in water. Usually expressed as grains per gallon or ppm as CaCO3. HARD WATER – Water which contains calcium …

S-T

S SADDLE – A casting, fabricated chair, or member used for the purpose of support. SAFE WORKING PRESSURE – See “Design Pressure.” SAFETY 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. SAFETY SHUT-OFF VALVE – A manually …

U ULTIMATE ANALYSIS – See “Analysis Ultimate.“ UL LISTED – Product certification that indicates the product meets safety standards determined by Underwriters Laboratories. (ULC and cUL indicate Canadian requirements.) UNACCOUNTED-FOR LOSS – That portion of a boiler heat balance which represents the difference between 100 per cent and the sum of the heat absorbed by …