Bolted Joints and Gasket Behavior PD539 Updated May 2012 1

PD539 Bolted Joints and Gasket Behavior

Day One

Introduction to the Bolted Joint Basic Concepts & Mechanics of Bolted Joints Bolt and Thread Strength, Stripping How Bolt Material Properties Affect the Joint. Materials Stiffness and Strain Considerations

Gasket Behavior, Selection and Specification Topics Introduction to the ROTT test

What is the Tightness parameter ROTT Draft 10 vs. Draft 9, Crush Test,

Gasket Selection Considerations Service considerations, how to Narrow choices Elevated temperature considerations Fiber, PTFE And Graphite based Gasket Characteristics ATRS, ARLA and other Qualification Tests

Gasket Qualification and Specification Considerations

Tightening the Joint: Introduction to Assembly Variables PCC-1 Guidelines Overview Nut Factor Variables And Bolting Pattern Research

Day Two

Tightening the Joint: (Continued) Torque Control Torque Calculator Other Preload Control Methods

Bolted Joint Calculation Methods (an overview) Gasketed Joints

ASME Code, Section VIII, Appendix 2 Proposed ASME Appendix BFJ Tightness Calculation of Standard Flanges spreadsheets EN1591 Calculation Overview Kflange, FEA discussion

Non-Gasketed Joints Simplified VDI Method- Text covers in detail VDI Calculation Overview

Bolted Joints and Gasket Behavior PD539 Updated May 2012 2

NASA - NSTS ( Shuttle) Approach

Understanding & Preventing Joint Failure Recognize Types Of Failures

Understand Essential Conditions

Identify Failure Modes Such As Fatigue, Preload Loss, Leaks, Lost Bolts, Corrosion, Etc.

The Special Case of Galling

Understand and Mitigate Self-Loosening Fatigue Corrosion

Selecting the Pre-load General considerations

Start At Minimum Load Approach Meet Design and add scatter, etc.

Start at Maximum Load Approach Subtract scatter, etc. ,Meet design