Metadata-Version: 2.1
Name: pipeline_integrity
Version: 1.1
Summary: Pipeline integrity calculation
Home-page: https://github.com/vb64/pipeline.integrity
Author: Vitaly Bogomolov
Author-email: mail@vitaly-bogomolov.ru
License: UNKNOWN
Project-URL: Bug Tracker, https://github.com/vb64/pipeline.integrity/issues
Description: # PipelineIntegrity library
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        [In Russian](READMEru.md)
        
        Free, open source PipelineIntegrity library designed to calculate the degree of danger
        of pipeline metal loss defects according to the [ASME B31G method](https://law.resource.org/pub/us/cfr/ibr/002/asme.b31g.1991.pdf).
        
        ![ASME B31G method](pipeline_integrity/method/asme_b31g/img/fig_1_1.png)
        
        ## Installation
        
        ```bash
        pip install pipeline-integrity
        ```
        
        ## Usage
        
        A pipe under pressure, with a length, diameter and wall thickness from specified material.
        
        ```python
        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.
        
        ```python
        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
        
        ```python
        from pipeline_integrity.method.asme_b31g import Context
        
        asme = Context(defect)
        ```
        
        Defect depth less than 10% wall thickness, no danger.
        
        ```python
        from pipeline_integrity.method.asme_b31g import State
        
        assert defect.depth == 0.039
        assert pipe.wallthickness == 0.63
        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.
        
        ```python
        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.
        
        ```python
        defect.depth = 0.31
        assert defect.length == 4
        assert round(asme.defect_max_length()) == 5
        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.
        
        ```python
        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.
        
        ```python
        assert pipe.maop == 900
        assert round(asme.safe_pressure, 2) == 700.68
        pipe.maop = 700
        assert asme.pipe_state(is_explain=True) == State.Defected
        ```
        
        If you call `pipe_state` method with parameter `is_explain=True`,
        then you can get explanation in text form.
        
        ```python
        asme.explain()
        ```
        
        ```text
        The relative defect depth == defect depth / pipe wall thickness * 100%.
        0.31 / 0.63 * 100 = 49.206
        Calculation of the maximum allowable defect length.
        Parameter B.
        The relative defect depth 49.206 more than 17.5%.
        B = sqrt(pow(0.492 / (1.1 * 0.492 - 0.15), 2) - 1) = 0.763
        L = 1.12 * B * sqrt(diameter * wallthickness)L = 1.12 * 0.763 * sqrt(56 * 0.63) = 5.073
        The length of the defect 20 exceed the maximum allowable length 5.073.
        It is necessary to calculate the allowable pressure for defect.
        Calculation of the maximum allowable pressure.
        Parameter A for defect length 20.
        A = 0.823 * defect_length / sqrt(diameter * wallthickness)
        A = 0.823 * 20 / sqrt(56 * 0.63) = 2.771
        Design pressure.
        Design_press = 2 * material_smys * wallthickness * design_factor * temperature_factor / diam.
        Design_press = 2 * 52000 * 0.63 * 0.72 * 1 / 56 = 842.4.
        Parameter A less than 4.
        a_pow = sqrt(pow(a_param, 2) + 1).
        a_pow = sqrt(pow(2.771, 2) + 1) = 2.946.
        Safe_press = 1.1 * design_press * ((1 - 2/3 * rel_depth) / (1 - 2/3 * rel_depth / a_pow)).
        Safe_press = 1.1 * 842.4 * ((1 - 2/3 * 0.492) / (1 - 2/3 * 0.492 / 2.946)) = 700.683.
        Use safe pressure 700.683 as maximum allowable pressure.
        The working pressure 700 does not exceed the allowable pressure 700.683.
        The defect is not dangerous.
        ```
        
        ## Development
        
        ```
        $ git clone git@github.com:vb64/pipeline.integrity.git
        $ cd pipeline.integrity
        ```
        With Python 3:
        ```
        $ make setup PYTHON_BIN=/path/to/python3
        $ make tests
        ```
        With Python 2:
        ```
        $ make setup2 PYTHON_BIN=/path/to/python2
        $ make tests2
        ```
        
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Description-Content-Type: text/markdown
