Estimate mass or geometric specifications of the manufactured pipes
Usage
b36mass(d, wth, len = 1, rho = 7.85, origin = NULL)
b36d(wth, mass, len = 1, rho = 7.85)
b36wth(d, mass, len = 1, rho = 7.85)Arguments
- d
nominal outside diameter of pipe, [mm]. Type:
assert_double- wth
nominal wall thickness of pipe, [mm]. Type:
assert_double.- len
pipe length, [m]. Type:
assert_double.- rho
mass density of pipe material, [g/cm³]. Type:
assert_double.- origin
identifier for the information origin regarding the specifications of pipe. Type:
assert_integer.- mass
actual mass of pipe, [kg]. Type:
assert_double.
Value
- for
b36mass pipe mass, [kg]
- for
b36wth pipe wall thickness, [mm]
- for
b36d outside diameter of pipe, [mm]
Details
The mass of a one-meter pipe segment is determined by linear interpolation
based on the tabular data provided in the specified origins (see
b36pipedata). If the origin of the initial data is
NULL (default), the mass of the pipe is calculated using a formula:
$$M = 10^{-3} \pi \rho w \left(d - w \right ) \cdot l$$
where
\(M\) - mass of a pipe, [kg]
\(\rho\) - mass density of pipe material, [g/cm³]
\(w\) - nominal wall thickness of the manufactured pipe, [mm]
\(d\) - nominal outside diameter of the manufactured pipe, [mm]
\(l\) - actual pipe length, [m]
For origin in c(1, 2, 4, 5) the values provided in the
b36pipedata match the calculated values obtained from the
formula with an accuracy of 1 %.
Inverse calculations b36wth and b36d are
performed using algebraically derived formulas.
See also
Other ASME B36.10M:
b36dwthv(),
b36pipedata
Examples
library(pipenostics)
# Since some specification origins provide the mass of a one-meter pipe
# segment taking into account possible deviations during its production
# process, when the user specifies the origin ID directly, the mass values
# are calculated using linear interpolation:
b36mass(68, 13, rho = 7.9, origin = 7L)
#> [1] 16.43
# The discrepancy with the calculations based on the formula can be more
# than 7 %:
b36mass(68, 13, rho = 7.9, origin = NULL)
#> [1] 17.74529
# For origins which are ASME B36 standards such differences should be
# minimal:
b36mass(965, 10.31, origin = 1L) - b36mass(965, 10.31, origin = NULL)
#> [1] 0.0004356046
# The calculations of diameter and wall thickness are straightforward and
# use only inverse formulas without origin references:
b36d(10.31, 242.74)
#> [1] 965.0017
b36wth(965, 242.74)
#> [1] 10.31002