ASME issues written replies to inquiries concerning interpretations of technical aspects of this Manual. Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. Such errata shall be used on the date posted. There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard. This Manual was developed under procedures accredited as meeting the criteria for American National Standards.
|Published (Last):||26 August 2009|
|PDF File Size:||14.59 Mb|
|ePub File Size:||7.11 Mb|
|Price:||Free* [*Free Regsitration Required]|
For a corroded profile defined by n measurements of depth of corrosion including the wsme points at nominally full wall thickness, n! It is the responsibility of the user to determine unitary conversion factors as may be required. The B31 Standards Committee regularly holds meetings, which are open asje the public. All methods described herein have been demonstrated to provide reliable and conservative results when they are applied correctly and within stated limitations.
Research indicates that it may be defined variously as given below. User Defined Outside Diameter schedtype: Subsequent revisions to the Manual may have superseded the reply. The revision of B31G reflected those objectives. Chin, TransCanada Pipeline U. Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation.
They were calculated from the equations for a Level 1 evaluation in accordance with the original B31G methodology. Where the term pipeline is used, it may asmd be read to apply to piping or pipe conforming to b31 acceptable applications and within the technical limitations discussed below.
It is noted that Sflow was defined as 1. We need your help to maintenance this website. The detailed profile is established by obtaining several measurements of metal loss or remaining wall thickness throughout the metal loss area. The following document summarizes the results of burst tests and service failures of line pipe affected by corrosion or artificial metal loss, and which have previously been b31 for the purpose of validating the evaluation methods presented herein: Pipe Outside Circumference OD: In addition, the following considerations apply: Define an acceptable safety factor, SF.
Read across to the column showing the wall thickness of the pipe. The tables are carried over without change from previous editions of B31G and have been supplemented by the addition of tables in metric units.
This definition remains an inherent element of the Level 0 assessment and is recommended with the Level 1 assessment performed in accordance with para.
Owing to its iterative nature, it is a practical b13g to use a computer program or other algorithmic approach e. When calculating the hoop stress SO or Shis t in this case g31g corroded pipe wall thickness? Methods employed for clustering of inline inspection anomalies should be validated by field verification of actual flaw dimensions and spacing. Simply mail, phone, fax, or E-mail us and a Customer Care representative will handle your request. Appleby, ExxonMobil Development Co.
If the exact measured value is not listed, choose the row showing the next greater depth. Consideration should be given to minimum thresholds of metal loss for reliable detection and sizing, minimum thresholds for reporting, and the expected mode of coating failure e. Interpretations can only be rendered in response to a written request sent to the Secretary of the B31 Standards Committee.
Evaluation of individual deep pits within a generally corroded area should account for the effect of wall loss due to general corrosion. For submerged pipelines, or to calculate the allowable pressure at a reference elevation, use the level 1 and level 2 calculators including elevation. Requests that are not in this format may be rewritten in asne appropriate format by the Committee prior to being answered, which may inadvertently change the intent of the original request.
October 24, The next edition of this Manual is scheduled for publication in The Committee Pages can be found azme http: Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
A failure criterion should be developed that considers the strain b31b or fracture resistance characteristics of the material. Related Posts.
Manual for Determining the Remaining Strength of Corroded Pipelines
Samura ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability. This definition remains an inherent element of the Level 0 assessment and is recommended with the Level 1 assessment performed in accordance with para. Size px x x x x User Defined Outside Diameter schedtype: Information as to whether or not technical inquiries are issued to this code or standard is shown on the copyright page. G31g technical inquiries must be submitted in writing to the staff secretary. Appleby, ExxonMobil Development Co.
ASME B31G (2012).pdf
It is applica- ambient within the range of operating temperature rec- ble to all pipelines and piping systems within the scope ognized by the governing standard, and provided mate- of the transportation pipeline codes that are part of rial strength properties at temperature are considered ASME B31 Code for Pressure Piping, namely: j metal loss in pipe operating at any level of allow- ASME B Evaluation of individual deep pits within a SMTS p specified minimum tensile strength at generally corroded area should account for the effect of ambient conditions wall loss due to general corrosion. SMYS p specified minimum yield strength at ambi- c Under conditions normally encountered in buried ent conditions pipelines, the hoop stress due to internal pressure is the t p pipe wall thickness largest stress and will govern the mode of failure. The methods and criteria provided The user may choose to conduct a Level 0, Level 1, herein do not address circumferential failure due to high Level 2, or Level 3 analysis, depending on the quantity longitudinal tensile stresses. Also, the combination of hoop stress due to internal by the addition of tables in metric units.
ASME B31G Pipe Corrosion Defect Calculator Module
The course begins with a summary of important material properties and a review of integrity assessment methods for pipeline defects. A discussion on analysis methods for mechanical damage is also included. Analysis methods for cracks are covered in the second day, which begins with a basic introduction to fracture mechanics. Participants learn about the methods of measuring toughness associated with linearly elastic and elastic-plastic behavior. Next, the use of failure assessment diagrams and the development of the log-secant equation are discussed, followed by J-integral based assessments. Finally, both propagating fractures and fatigue are evaluated. For venue information, please click HERE.