Post on 17-Dec-2015
description
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