pipeline-integrity 1.0

Pipeline integrity calculation

PipelineIntegrity library

In Russian

Free, open source PipelineIntegrity library designed to calculate the degree of danger of pipeline metal loss defects according to the ASME B31G method.

Installation

pip install pipeline-integrity

Usage

A pipe under pressure, with a length, diameter and wall thickness from specified material.

from pipeline_integrity.material import Material
from pipeline_integrity.pipe import Pipe

pipe = Pipe(
  440,  # length, inches
  56,  # diameter, inches
  0.63,  # wall thickness, inches
  Material(  # pipe material
    "Steel",
    52000  # SMYS, psi
  ),
  900  # pressure, psi
)
)

Metal loss defect with a specified position on the pipe and a specified depth.

defect = pipe.add_metal_loss(
  40,  # the defect starts at a distance of 40 inches from the beginning of the pipe
  4,  # defect length 4 inches
  10,  # along the circumference of the pipe, the defect begins
       # at 10 arc minutes from the top of the pipe
  20,  # the size of the defect along the circumference is 20 arc minutes
  0.039  # defect depth 0.039 inches
)

Context for calculating the degree of severity of the defect according to the ASME B31G method

from pipeline_integrity.method.asme_b31g import Context

asme = Context(defect)

Defect depth less than 10% wall thickness, no danger.

from pipeline_integrity.method.asme_b31g import State

assert asme.pipe_state() == State.Ok

The depth of the defect is more than 80% of the pipe wall thickness, repair or replacement of the pipe is necessary.

defect.depth = 0.6
assert asme.pipe_state() == State.Replace

The depth of the defect is 50% of the pipe wall thickness, but the length of the defect does not exceed its maximum allowable length. The defect is not dangerous.

defect.depth = 0.31
assert asme.pipe_state() == State.Safe

A defect with a length of 20 inches and a depth of 50% of the pipe wall thickness requires repair at the specified working pressure in the pipe.

defect.length = 20
assert asme.pipe_state() == State.Repair

When the operating pressure is reduced to a safe value, the defect does not require repair.

assert pipe.maop == 900
assert round(asme.safe_pressure, 2) == 700.68
pipe.maop = 700
assert asme.pipe_state() == State.Defected