Page 666 - Air and Gas Drilling Manual

A-4 Air and Gas Drilling Manual
Table A-4: Other important English and metric SI quantities and conversions

Engineering gas constant R
English R = 53.36 ft-lb/lb-˚ R
Metric R = 29.28 N-m/N-K
Energy
English 1 ft-lb = 1 lb-ft
Metric SI 1 N-m = 1 joule (J)
Heat
English 1 Btu = 252 cal (heat reqired to raise 1.0 lb of
water 1.0˚ R)
Metric 1 cal = 4.187 J (heat required to raise 1.0 g of
water 1.0 K)

Temperature
English ˚ R = 459.67˚ + ˚ F
Metric SI K = 273.15˚ + ˚ C

Pressure
2
English 1 lb/ft = 144 psi
Metric SI 1 Pascal (Pa) = N/m 2
Power
English 1 horsepower = 550 ft-lb/sec
Metric SI 1 watt (W) = 1 J/sec (or 1 N-m/sec)

Absolute Viscosity
2 2
English 1 lb-sec/ft = 47.88 N-sec/m
-1 2
Metric SI 1 Poise (P) = 10 N-sec/m
Kinematic Viscosity
2
2
English 1 ft /sec = 0.0929 m /sec
2
-4
Metric SI 1 Stoke (St) = 10 m /sec