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  • Usage of design factors above 72% SMYS in Canada
    On the Mainline system (East of Alberta-Saskatchewan border) there are about 7200 km of pipelines with MAOP corresponding to 77% or more of SMYS, ranging from 508 to 1219 mm OD, 359 to 550 MPa SMYS, installed (or upgraded) between the early Seventies and 2005
  • Impact of Improving Design Factor over 0. 72 on the Safety and . . .
    The application history of higher design factors in the U S and Canada was reviewed And the effect of higher factors to the critical flaw size, puncture resistance, change of reliability with time, risk level and the arrest toughness requirements of pipeline were analyzed here
  • IPC02-27007 - JULY FINAL. PDF - Penspen
    Most pipelines codes around the world limit design stresses to 72% SMYS However, USA and Canadian pipeline codes allow operation at hoop stresses up to 80% SMYS; but current regulations in the USA limit the stress to 72% SMYS
  • “Interim Guidelines for Confirming Pipe Strength in Pipe Susceptible to . . .
    “Operator” must also comply with the following requirements for operations of Class 1 pipe above 72% specified minimum yield strength (SMYS) and for all other pipe in the alternative maximum operating pressure (MOP) special permit pipeline:
  • Elbow allowable stresses - Pipelines, Piping and Fluid Mechanics . . .
    Depending on whether you're in the US or Canada codes the design allowable is 72% or 80% SMYS, the question is if you've design the straight pipe wall thickness based on hoop stress compared to this allowable (assuming we're just accounting for internal pressure) how can an attached elbow have the same nominal thickness if its calculated
  • INTERNATIONAL SELECTION AND USAGE OF DESIGN FACTORS ABOVE 72% SMYS
    Relative to operation above 72% SMYS, TransCanada’s experience is fully representative of Canadian practice and experience The paper briefly presents the historical background to the use of higher design factors in Canada, including the evolution of the Canadian standards for oil and gas pipelines
  • Pipeline Safety: Reconsideration of Natural Gas Pipeline Maximum . . .
    International pipeline regulations generally limit design stresses to 72% specified minimum yield strength (SMYS) Under highly selective conditions, some pipelines in the United States and Canada operate at hoop stresses up to 80% SMYS
  • Pipeline Hydro Test Pressure Determination | anakkelautan
    Though codes and regulatory directives are specific about setting test pressure to below 72% or in some cases up to 80% of the SMYS of the material, there is a strong argument on testing a constructed pipeline to “above 100% of SMYS,” and as high as 120% of SMYS is also mentioned
  • Benefit of Applying DNV-OS-F101 as Acceptance Criteria for Offshore . . .
    Generally, the LCC equation can give higher allowable bending moment load compared to typical stress limit of 85% and 72% SMYS applied on overbend and sagbend A lower pipe grade being more ductile is also shown to have better allowable bending moment than pipe with higher grade material
  • This document was downloaded from the Penspen Integrity Virtual Library
    In most pipeline-design standards or recommendations, the basic wall-thickness design requirement is based on limiting the pipe hoop stress due to internal pressure to an allowable stress, which equals the SMYS multiplied by a design factor





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