shell92pf: Shell92. Failure pressure of the corroded pipe

In pipenostics: Diagnostics, Reliability and Predictive Maintenance of Pipeline Systems

Description

Calculate failure pressure of the corroded pipe according to Shell92 code.

This code should be applied only to

• single cross section of the pipeline containing a longitudinally oriented, flat bottom surface defect of the corrosion/erosion type;

• defects which depth is less than 85 % of pipe wall thickness.

The estimation is valid for single isolated metal loss defects of the corrosion/erosion type and when only internal pressure loading is considered.

As in the case of dnvpf, the defect is approximated by a rectangular form.

Usage

shell92pf(d, wth, uts, depth, l)

Arguments

d	nominal outside diameter of the pipe, [mm]. Type: assert_double.
wth	nominal wall thickness of the pipe, [mm]. Type: assert_double.
uts	ultimate tensile strength (UTS) or specified minimum tensile strength (SMTS) as a characteristic of steel strength, [MPa]. Type: assert_double.
depth	measured maximum depth of the corroded area, [mm]. Type: assert_double.
l	measured maximum longitudinal length of corroded area, [mm]. Type: assert_double.

Details

Numeric NAs may appear in case prescribed conditions of use are offended.

Value

Estimated failure pressure of the corroded pipe, [MPa]. Type: assert_double.

References

Timashev and A. Bushinskaya, Diagnostics and Reliability of Pipeline Systems, Topics in Safety, Risk, Reliability and Quality 30, DOI 10.1007/978-3-319-25307-7

See Also

Other fail pressure functions: b31gpf, b31gmodpf, dnvpf, pcorrcpf

Examples

d     = c(812.8, 219.0)  # [mm]
wth   = c( 19.1,  14.5)  # [mm]
uts  = c(530.9, 455.1)   # [N/mm^2]
l     = c(203.2, 200.0)  # [mm]
depth = c( 13.4,   9.0)  # [mm]

shell92pf(d, wth, uts, depth, l)
# [1] 11.09262 25.27286

pipenostics documentation built on March 2, 2021, 5:06 p.m.