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Aramco Piperack 103

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  • Previous Issue: New Next Planned Update: 1 September, 2007 Page 1 of 81 Primary contact: Abu-Adas, Hisham on phone 874-6908

    Best Practice SABP-007 31 August, 2002 Steel Piperack Design

    Document Responsibility: Onshore Structures Standards Committee

    Steel Piperack Design

    Developed by: Hisham Abu-Adas Developed: July, 2002 Civil Engineering Unit/M&CED Consulting Services Department

  • Document Responsibility: Onshore Structures SABP-007Issue Date: 31 August, 2002Next Planned Update: 1 September, 2007 Steel Piperack Design

    Page 2 of 51

    STEEL PIPERACK DESIGN

    Table of ContentsPage

    1 Introduction ........................................................................................................ 41.1 Purpose.................................................................................................... 41.2 Scope........................................................................................................ 41.3 Disclaimer ............................................................................................... 41.4 Conflicts with Mandatory Standards ................................................... 4

    2 References ........................................................................................................... 42.1 Saudi Aramco Standards....................................................................... 52.2 Industry Codes and Standards.............................................................. 5

    3 General ................................................................................................................ 5

    4 Primary Loads .................................................................................................... 74.1 Dead Load (D)......................................................................................... 74.2 Product Load (PL) .................................................................................. 84.3 Test Load (Pt) ......................................................................................... 84.4 Thermal Loads (TL)............................................................................... 94.5 Wind Load (W)..................................................................................... 104.6 Earthquake Load (E) ........................................................................... 114.7 Other Loads (O) ................................................................................... 11

    5 Load Combinations .......................................................................................... 125.1 Loading Combinations Allowable Stress Design............................ 125.2 Loading Combinations and Load Factors Strength Design.......... 13

    6 Allowable Stresses and Strength Requirements............................................ 136.1 Structural Steel..................................................................................... 136.2 Anchor Bolts ......................................................................................... 136.3 Cast-in-Place Concrete ........................................................................ 13

    7 Piperack Superstructure Design..................................................................... 147.1 General .................................................................................................. 147.2 Transverse Bent Beams ....................................................................... 147.3 Bent Columns........................................................................................ 157.4 Longitudinal Struts .............................................................................. 157.5 Vertical Bracing.................................................................................... 16

  • Document Responsibility: Onshore Structures SABP-007Issue Date: 31 August, 2002Next Planned Update: 1 September, 2007 Steel Piperack Design

    Page 3 of 51

    Table of ContentsPage

    8 Piperack Foundations ...................................................................................... 16

    ATTACHMENTS:

    Attachment 1:Piperack Design Example 1.......................................................................... 17

    List of Figures for Example 11. Piperack Plan Layout.............................................................................. 232. Typical Bent ................................................................................................ 243. Wind Loads on Typical Bent..................................................................... 254. Wind Loads for STAAD III Input ............................................................ 265. Computer Model for STAAD III Input.................................................... 276. Kz Calculations For STAAD III Computer Input .................................. 287. Typical Bent Computer Output -Member

    Unity Check & Moment Diagram............................................................. 29

    Attachment 2:STAAD III Computer Input & Output for Example 1 ................................ 30

    Attachment 3:Weights of Standard (STD) and Extra Strong (XS) Pipes ........................... 49

  • Document Responsibility: Onshore Structures SABP-007Issue Date: 31 August, 2002Next Planned Update: 1 September, 2007 Steel Piperack Design

    Page 4 of 51

    1 Introduction

    1.1 Purpose

    The purpose of this practice is to provide guidelines for steel piperack design foruse by engineers working on Saudi Aramco projects and Saudi Aramcoengineers.

    1.2 Scope

    This design guide defines the minimum requirements for the design of piperacksin process industry facilities at Saudi Aramco sites. It covers general designphilosophy and requirements to be used in the analysis and design of piperacks.Criteria presented herein pertain to loads, load combinations, allowable stresses,and superstructure and foundation design. Section 2 of this instruction includesreference codes, and Saudi Aramco Standards.

    1.3 Disclaimer

    The material in this Best Practices document provides the most correct andaccurate design guidelines available to Saudi Aramco which comply withinternational industry practices. This material is being provided for the generalguidance and benefit of the Designer. Use of the Best Practices in designingprojects for Saudi Aramco, however, does not relieve the Designer from hisresponsibility to verify the accuracy of any information presented or from hiscontractual liability to provide safe and sound designs that conform toMandatory Saudi Aramco Engineering Requirements. Use of the information ormaterial contained herein is no guarantee that the resulting product will satisfythe applicable requirements of any project. Saudi Aramco assumes noresponsibility or liability whatsoever for any reliance on the informationpresented herein or for designs prepared by Designers in accordance with theBest Practices. Use of the Best Practices by Designers is intended solely for,and shall be strictly limited to, Saudi Aramco projects. Saudi Aramco is aregistered trademark of the Saudi Arabian Oil Company. Copyright, SaudiAramco, 2002.

    1.4 Conflicts with Mandatory Standards

    In the event of a conflict between this Best Practice and other Mandatory SaudiAramco Engineering Requirement, the Mandatory Saudi Aramco EngineeringRequirement shall govern.

  • Document Responsibility: Onshore Structures SABP-007Issue Date: 31 August, 2002Next Planned Update: 1 September, 2007 Steel Piperack Design

    Page 5 of 51

    2 References

    This Best Practice is based on the latest edition of the references below, unlessotherwise noted. Short titles will be used herein when appropriate. Short titles will beused herein when appropriate.

    2.1 Saudi Aramco Standards

    Saudi Aramco Engineering Standards

    SAES-A-112 Meteorological and Seismic Design DataSAES-Q-005 Concrete Foundations

    Saudi Aramco Best Practices

    SABP-002 Spread Footings DesignSABP-006 Wind loads on Piperacks & Open Frame

    Structures

    2.2 Industry Codes and Standards

    American Concrete Institute (ACI)

    ACI 318 Building Code Requirements for ReinforcedConcrete and Commentary

    American Society of Civil Engineers (ASCE)

    ASCE 7 Minimum Design Loads for Buildings and OtherStructures

    Wind Load and Anchor Bolt Design for Petrochemical FacilitiesGuidelines for Seismic Evaluation and Design of Petrochemical Facilities

    American Institute of Steel Construction (AISC)

    AISC Manual of Steel Construction Allowable Stress Design (ASD)

    American Society for Testing and Materials (ASTM)

    ASTM A36 Specification for Carbon Structural SteelASTM A325 Specification for High strength Bolts for

    Structural Steel Joints, Including Suitable nutsand Plain Washers

    ASTM A992/A992M Specification for Steel for Structural Shapes forUse in Building Framing

  • Document Responsibility: Onshore Structures SABP-007Issue Date: 31 August, 2002Next Planned Update: 1 September, 2007 Steel Piperack Design

    Page 6 of 51

    3 General

    3.1 Piperacks are structures that support pipes and auxiliary equipment within andbetween process areas of industrial plants. Piping loads can vary greatly fromproject to project as can the loads from wind and earthquake. Clearly, it isdifficult to define specific criteria for the design of such structures. Thisguideline, however, sets forth general requirements, which the Engineer shouldincorporate into piperack designs if possible.

    3.2 This guideline applies to the following three basic types of steel piperacks:

    Strutted main piperacks

    Unstrutted secondary or miscellaneous pi

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