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TECH TIPS

The Tech Tips section of our site is designed to be a resource for facility managers, building engineers, and all other visitors to our Web site who are interested in learning more about the maintenance, repair, and installation of mechanical systems.

HELPFUL FORMULAS

Electrical Formulas

  • 1 HP = 746 Watts = .746 KW

  • Horsepower (3-Phase) = volts x amperes x 1.732 x efficiency x power factor, divided by 746

  • Horsepower (1-Phase) = volts x amperes x efficiency x power factor, divided by 746

  • Torque (lb/ft) = horsepower x 5250, divided by RPM

Miscellaneous Formulas

  • Head in Feet = 2.31 PSIG

  • Latent Heat of Vaporization = 970.4 btu

  • Latent Heat of Fusion = 144 btu

  • Equivalent Units for Fuels:

      No. 2 Oil = 140,000 btu/gal
      No. 5 Oil = 148,000 btu/gal
      No. 6 Oil = 150,000 btu/gal
      1 Therm = 100,000 btu
      1 Kw = 3,413 btu

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