defekt_depth.md

Depth of defect

Rows of the csv file can contain data on the depth of the defect in the following units.

• percentage of the pipe wall thickness for metal loss or of the pipe diameter for dents (default)
• hundredths of a millimeter

The Row.depth_units attribute describes the units of measurement for the depth of the defect.

from pipeline_csv.csvfile.row import Row, Depth

class MyRow(Row):

    depth_units = Depth.HundredthsOfMillimeter

The Row.dents_codes method specifies a list of defect types that are interpreted as dents.

class MyRow(Row):

    @staticmethod
    def dents_codes():
        return [TypeDefekt.DENT]

A dent measuring 10x10 and 70 mm deep on a pipe with a diameter of 700 mm and a wall thickness of 10 mm.

from pipeline_csv.csvfile import Stream
from pipeline_csv.csvfile.tubes import Tube
from pipeline_csv.csvfile.defect import Defect

pipe = Tube(Row.as_weld(10), Stream(diameter=700), None)
pipe.thick = 100  # 10 mm

row = Row.as_defekt(
  11, TypeDefekt.DENT, 0, '10', '10',
  '7000',  # 70 mm
  None, None, None, None, ''
)

dent = Defect(row, pipe)

assert dent.depth_mm == 70

As a percentage of the pipe diameter, the dent depth is 10%.

assert dent.depth_percent == 10

Metal loss measuring 10x10, 5mm deep.

row = Row.as_defekt(
  11, TypeDefekt.CORROZ, 0, '10', '10',
  '500',  # 5 mm
  None, None, None, None, ''
)
mloss = Defect(row, pipe)

assert mloss.depth_mm == 5

As a percentage of the pipe wall thickness, the depth of the defect is 50%.

assert mloss.depth_percent == 50