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컨텐츠 | contents |
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스터디 | study |
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| PIPE CALCULATION METHODS |
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| 글쓴이 : 운영자 고유ID : 운영자
날짜 : 00-00-00 00:00
조회 : 15499
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PIPE CALCULATION METHODS
The following calculation methods are used in N P S. (All units are normalized by N P S to ensure dimensional correctness).
wall_thickness = (outside_diameter - inside_diameter) / 2
bore_area = (pi / 4) x (inside_diameter) ^ 2
wall_area = [(pi / 4) x (outside_diameter) ^ 2] - bore_area
linear_weight = wall_area x unit_length x material_density
section_modulus = pi x [(outside_diameter^4) - (inside_diameter^4)]
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[32 x outside_diameter]
moment_of_inertia = pi x [(outside_diameter^4) - (inside_diameter^4)]
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radius_of_gyration = [(outside_diameter^2) + (inside_diameter^2)] ^0.5
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material_density = density of the piping material. For a list of the densities used, see the HELP screen on the main N P S program.
vol_flow_capacity = bore_area x flow_velocity
mass_flow_capacity = vol_flow_capacity x water_density
flow_velocity = 1 foot/second for US and Imperial units
= 1 metre/second for Metric units
water_density = 0.03613 pounds/cubic inch for US and Imperial units
= 1 gram/cubic centimetre for Metric units
The following constants are used for conversions between US, Imperial and Metric units:
1 foot = 0.3048 metre
1 inch = 2.54 cm
1 US gal = 3.785 litres
1 Imp gal = 4.54 litres
1 US petroleum barrel = 42 US gal
1 US liquid barrel = 31.5 US gal
1 pound = 0.454 kg
1 ton = 2000 pounds
1 tonne = 1000 kg
Additional constants used:
pi = 3.14159
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