SI Units - SI UNITS The 2001 Edition of the Boiler and...

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Unformatted text preview: SI UNITS The 2001 Edition of the Boiler and Pressure Vessel Code is based on U.S. Customary (ft-lb) units of measurement which are to be regarded as the standard. This supplement is provided as a convenience to the Code user and contains SI conversion factors for units contained in the Code. liii COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services LIST OF SI UNITS FOR USE WITH ASME BOILER AND PRESSURE VESSEL CODE1 Quantity Space and Time plane angle length area volume time Unit radian meter square meter cubic meter second Symbol rad m m2 m3 s Other Units or Limitations degree (decimalized) liter (L) for liquid only (use without prefix other than in milliliter, mL) minute (min), hour (h), day (d), week, and year Periodic and Related Phenomena frequency rotational frequency Mechanics mass density moment of inertia force moment of force (torque) pressure and stress energy, work power impact strength section modulus moment of section (second moment of area) fracture toughness Heat temperature — thermodynamic [Note (2)] temperature — other than thermodynamic linear expansion coefficient quantity of heat heat flow rate thermal conductivity thermal diffusivity specific heat capacity Electricity and Magnetism electric current electric potential current density magnetic field strength hertz revolutions per second Hz s−1 revolutions per second (r/s) revolutions per minute (r/m) kilogram kilogram per cubic meter kilogram · meter2 newton newton-meter pascal joule watt joule meter3 meter4 Pa · m kg kg/m3 kg · m2 N N·m Pa J W J m3 m4 (pascal p newton per square meter) kilowatt-hour (kW · h) kelvin degree Celsius meter per meter-kelvin joule watt watt per meter-kelvin square meter per second joule per kilogram-kelvin K °C K−1 J W W/(m · K) m2 /s J/(kg · K) degree Celsius (°C) kelvin (K) °C−1 W/(m · °C) J/(kg · °C) ampere volt ampere per meter2 ampere per meter A V A/m2 A/m NOTES: (1) Conversion factors between SI units and U.S. customary are given in SI-1, “ASME Orientation and Guide for Use of SI (Metric) Units,” and ASTM E 380. (2) Preferred use for temperature and temperature interval is degrees Celsius (°C), except for thermodynamic and cryogenic work where kelvins may be more suitable. For temperature interval, 1 K p 1°C exactly. liv COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services COMMONLY USED CONVERSION FACTORS (For Others See ASTM E 380) [See Note (1)] Quantity plane angle length To Convert From degree in ft yd in2 ft2 yd2 in3 ft3 US gallon Imperial gallon liter lbm ton (metric) (mass) ton (short 2000 lbm) kgf lbf kgf · m lbf · in lbf · ft kgf/m2 lbf/ft2 lbf/in2 (psi) kips/in2 bar Btu (IT) [Note (3)] ft · lbf hp (550 ft · lbf/s) ksi °C °F °F °C °F in rad m m m m2 m2 m2 m3 m3 m3 m3 m3 kg kg kg N N N·m N·m N·m Pa Pa Pa Pa Pa J J W Pa · K K °C K K or °C m To 1.745 329 2.54* 3.048* 9.144* 6.451 6* 9.290 304* 8.361 274 1.638 2.831 3.785 4.546 1.0* 706 685 412 09 Multiply by [Note (2)] E−02 E−02 E−01 E−01 E−04 E−02 E−01 E−05 E−02 E−03 E−03 E−03 E−01 E+03 E+02 E+00 E+00 E+00 E−01 E+00 E+00 E+01 E+03 E+06 E+05 E+03 E+00 E+02 E+06 area volume mass 4.535 924 1.000 00* 9.071 847 9.806 65* 4.448 222 9.806 65* 1.129 848 1.355 818 9.806 4.788 6.894 6.894 1.0* 65* 026 757 757 force bending, torque pressure, stress energy, work 1.055 056 1.355 818 7.456 999 1.098 843 tK p tC + 273.15 tK p (tF + 459.67)/1.8 tC p (tF − 32)/1.8 1.0* 5.555 555 power fracture toughness temperature temperature interval E+00 E−01 NOTES: (1) Care should be taken when converting formulas or equations that contain constant terms or factors. The value of these terms must be understood and may also require conversion. (2)(a) Relationships that are exact in terms of the base units are followed by a single asterisk. (b) The factors are written as a number greater than 1 and less than 10 with 6 or less decimal places. The number is followed by the letter E (for exponent), a plus or minus symbol, and two digits which indicate the power of 10 by which the number must be multiplied to obtain the correct value. For example: 3.523 907 E−02 is 3.523 907 × 10−2 or 0.035 239 07. (3) International Table lv COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services COPYRIGHT COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services ...
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This note was uploaded on 10/04/2010 for the course ENGINEERS 22453175 taught by Professor Heydari during the Spring '08 term at Miami University.

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