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DC 3rd Class Boiler Exam Prep: Essential Formulas and Constants for Success $7.99   Add to cart

Exam (elaborations)

DC 3rd Class Boiler Exam Prep: Essential Formulas and Constants for Success

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DC 3rd Class Boiler Exam Prep: Essential Formulas and Constants for Success Length x Width - Area of a rectangle .7854 x Diameter² - Area of a Circle Length x Width x Height - Volume of a Box .7854 x Diameter² x Length - Volume of a Cylinder π x Diameter - Circumference of a Circle Pound...

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  • November 10, 2024
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DC 3rd Class Boiler Exam Prep:
Essential Formulas and Constants for
Success
Length x Width - ✔✔Area of a rectangle

.7854 x Diameter² - ✔✔Area of a Circle

Length x Width x Height - ✔✔Volume of a Box

.7854 x Diameter² x Length - ✔✔Volume of a Cylinder

π x Diameter - ✔✔Circumference of a Circle

Pound (lb) - ✔✔Unit of Force

Pressure ÷ Area - ✔✔Formula for Force

in-lb or ft-lb - ✔✔Unit of Work

Force x Distance - ✔✔Formula for Work

ft-lb/min - ✔✔Unit of Power

= Work ÷ Time
or (Force x Distance) ÷ Time - ✔✔Formula for Power

= Power ÷ 33,000 ft-lb/min - ✔✔Formula for Mechanical Horsepower

°C = (°F - 32) ÷ 1.8 - ✔✔Fahrenheit to Celsius

°F = (1.8 x °C) - 32 - ✔✔Celsius to Fahrenheit

°R = °F + 460 - ✔✔Fahrenheit to Rankine

,K = °C +273.15 - ✔✔Celsius to Kelvin

Volume1 / Pressure1 = Volume2 / Pressure2 - ✔✔Charles' First Law

Pressure1 / Temperature1 = Pressure2 / Temperature2 - ✔✔Charles' Second
Law

Pressure1 x Volume1 = Pressure2 x Volume2 - ✔✔Boyle's Law

(Pres1 x Vol1)/ Temp1 = (Pres2 x Vol2)/Temp2 - ✔✔General Gas Law

Resistance x DistanceR = Effort x DistanceE - ✔✔Formula for Levers

Force x Length = Resistance x Height - ✔✔Formula for Inclined Planes

Force x DistanceF = Resistance x DistanceR - ✔✔Formula for Wheel & Axel

Force x Radius - ✔✔Torque

(Area of Staybolt x Stress Constant of Staybolt) ÷ Area Covered by Staybolt or =
(a x C) ÷ A - ✔✔Safe Working Pressure of a Riveted Boiler (SWP)

= Pitch x Pitch - ✔✔Area Covered by Staybolt

(P x D x L) / 2t
P = Pressure
D = Diameter
L = Length
t = thickness of steel - ✔✔Longitudinal Stress

=CxLx#
C = Circumference of tubes
L = Length of tubes
# = Number of tubes
HS = π x Diameter x Length x Number of Tubes - ✔✔Boiler Heating Surface
(tubes) =

, 746 Watts - ✔✔Watts per Boiler Horsepower

= ft-lb/min ÷ 33000 ft-lb/min - ✔✔Horsepower formula

= gpm x 8.33 x head (ft) - ✔✔ft-lb formula for a pump

= [Hs - (tfw-32)] ÷ 970.3
Hs = Enthalpy of steam
tfw = temperature of feed water - ✔✔Factor of Evaporation (FE) =

970.3 Btu/lb - ✔✔Latent Heat of Vaporization for Water

144 Btu/lb - ✔✔Latent Heat of Fusion for Water

34.5 lbs/hr - ✔✔1 Boiler Horsepower = x lbs of steam generator per hour

33,475 Btu/hr - ✔✔1 Boiler Horsepower = x Btu/hr

10 ft² heating surface - ✔✔1 BHP = x ft² of heating surface (general)

x 1600 - ✔✔Volume of water increases by x percent when it flashes to steam

= Lbs Steam per hour [Hs -(fwt° -32)] ÷ Units of Fuel per hour x Btu content per
unit of fuel
Hs = Btu content of steam
fwt = feed water temperature - ✔✔Thermal Efficiency (TE) =

= (Pounds of Steam per hour (Ws) x FE) ÷ 34.5
Ws = Lbs of steam per hour
FE = Factor of Evaporation - ✔✔Developed Boiler Horsepower (DBHP) =

= (TS x t x E) / FS x r
TS = Tensile Strength of steel
t = thickness of steel
E = Efficiency of joint
FS = Factor of Safety

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