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Rectangular Industrial Duct Construction Standards (IP) Version, 2004

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FOREWORD
RECTANGULAR INDUSTRIAL TASK FORCE
FORMER COMMITTEE MEMBERS AND OTHER CONTRIBUTORS
NOTICE TO USERS OF THIS PUBLICATION
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION [Go to Page]
1.1 SCOPE
1.2 PURPOSE
1.3 DEVELOPMENT OF THE SECOND EDITION
1.4 INDUSTRIAL DUCT DESIGN
1.5 HOW TO USE THIS MANUAL
1.6 MANUAL CONTENTS
CHAPTER 2 INDUSTRIAL DUCT APPLICATIONS [Go to Page]
2.1 INTRODUCTION
2.2 DEFINITION OF INDUSTRIAL DUCT
2.3 DUCT SYSTEM CLASSIFICATION
2.4 MATERIAL (PARTICULATE) CHARACTERISTICS AND CLASSES
Table 2-1 Duct Classes and Minimum Conveying Velocities
Table 2-2 Material Class Descriptions
Table 2-3 Specific Materials Classes
CHAPTER 3 DUCT MATERIALS [Go to Page]
3.1 INTRODUCTION
3.2 MATERIAL TYPES
3.3 CARBON AND COATED STEEL DATA
3.4 STAINLESS STEEL DATA
3.5 ALUMINUM DATA
3.6 MATERIAL PROPERTIES SUMMARY
3.7 CORROSION
Table 3-1 Hot"rolled Steel Gages
Table 3-2 Cold"rolled Steel Gages
Table 3-3 Galvanized and Aluminized Steel Gages
Table 3-4 Yield Strength Reduction Factor ( f) at Elevated Temperatures for Carbon and Coated Steels
Table 3-5 Modulus of Elasticity Reduction Factor ( e) at Elevated Temperatures for Carbon and Coated Steels
Table 3-6 Stainless Steel Gages
Table 3-7 Yield Strength Reduction Factor at Elevated Temperatures for Stainless Steel
Table 3-8 Modulus of Elasticity Reduction Factor at Elevated Temperatures for Stainless Steel
Table 3-9 Aluminum Sheet Gages
Table 3-10 Yield Strength Reduction Factor at Elevated Temperatures for Aluminum
Table 3-11 Modulus of Elasticity Reduction Factor at Elevated Temperatures for Aluminum
Table 3-12 Material Properties and Temperature Limits
Table 3-13 Corrosion Chart
CHAPTER 4 DESIGN CRITERIA [Go to Page]
4.1 INTRODUCTION
4.2 GENERAL PROVISIONS
4.3 NOMENCLATURE
4.4 LOADS
4.5 LIMITS AND TOLERANCES
4.6 SERVICEABILITY AND DURABILITY
4.7 DESIGN OF DUCT THICKNESS
4.8 DESIGN OF STIFFENER SIZE
4.9 DESIGN OF SUPPORT SPACING
4.10 BOLTING OF CONNECTIONS
4.11 CHECKING SHEAR CAPACITY OF DUCT SIDE WALLS
4.12 CRITERIA FOR THE DESIGN OF SYSTEMS WITH INTERNAL SUPPORTS
4.13 HANGERS AND SUPPORTS
4.14 THERMAL EXPANSION
Table 4-1 Coefficients for Mode B Analysis
FIGURE 4-1 CRITICAL LOAD DIAGRAMS FOR WORST CASE CONDITIONS
FIGURE 4-2 PARTICULATE LOAD
FIGURE 4-3 PANEL LOADING—MODE A
FIGURE 4-4 PANEL LOADING—MODE B
FIGURE 4-5 STIFFENER LOADING
FIGURE 4-6 EQUIVALENT BEAM CROSS-SECTION
FIGURE 4-7 FLANGED CONNECTION
FIGURE 4-8 TYPES OF SIDEWALL BUCKLING
FIGURE 4-9 REINFORCEMENT PATCH
FIGURE 4-10 COMPARISON OF CRITICAL BUCKLING LOADS FOR 48 x 24 IN. DUCT
FIGURE 4-11 COMPARISON OF CRITICAL BUCKLING LOADS FOR 72 x 36 IN. DUCT
FIGURE 4-12 INTERNAL SUPPORTS
FIGURE 4-13 FIXED STIFFENERS
FIGURE 4-14 UNFIXED STIFFENERS
FIGURE 4-15 DEFINITION OF RISER SUPPORT LOADS
CHAPTER 5 DESIGN EXAMPLES [Go to Page]
5.1 DESIGN EXAMPLES
5.2 SUBDIVIDING PANELS AND SELECTING INTERNAL SUPPORTS
Table 5-1 Design Example Variables
FIGURE 5-1 SUBDIVIDING PANELS
FIGURE 5-2 INTERNAL PIPE SUPPORTS
EXAMPLE #5-1
EXAMPLE #5-2
EXAMPLE #5-3
EXAMPLE #5-4
EXAMPLE #5-5
EXAMPLE #5-6
EXAMPLE #5-7
CHAPTER 6 DUCT SELECTION TABLES " CARBON AND COATED STEELS [Go to Page]
6.1 INTRODUCTION
6.2 SCOPE
6.3 MINIMUM MATERIAL MECHANICAL PROPERTIES
6.4 USE OF THE TABLES
6.5 DESIGN PROCESS
6.6 DUCT SELECTION TABLES
6.7 AUXILIARY TABLES
6.1-XAX List of Commercial Grade 32 ksi Carbon Steel Tables
6.2-XAX List of Structural Grade 36 ksi Carbon Steel Tables
6.3-XAX List of Structural Grade 50 ksi Carbon Steel Tables
6-X List of Auxiliary Carbon Steel Tables
FIGURE 6-1 CRITICAL LOAD DIAGRAMS FOR WORST CASE CONDITIONS
FIGURE 6-2 STIFFENING GUIDELINES FOR FLAT PANELS
FIGURE 6-3 SAMPLE PANEL CAPACITY OPTIONS FROM TABLE 6.1-1A.1
FIGURE 6-4 PANEL THICKNESS & DEFLECTION PER STIFFENER SPACING
FIGURE 6-5 STIFFENER SIZE PER STIFFENER SPACING
CHAPTER 7 DUCT SELECTION TABLES " STAINLESS STEEL [Go to Page]
7.1 INTRODUCTION
7.2 SCOPE
7.3 MINIMUM MATERIAL MECHANICAL PROPERTIES
7.4 USE OF THE TABLES
7.5 DESIGN PROCESS
7.6 DUCT SELECTION TABLES
7.7 AUXILIARY TABLES
7-A.X List of 35 ksi Stainless Steel Tables
7-X List of Auxiliary Stainless Steel Tables
FIGURE 7-1 CRITICAL LOAD DIAGRAMS FOR WORST CASE CONDITIONS
FIGURE 7-2 STIFFENING GUIDELINES FOR FLAT PANELS
FIGURE 7-3 SAMPLE PANEL CAPACITY OPTIONS FROM TABLE 7-A.3
FIGURE 7-4 PANEL THICKNESS & DEFLECTION PER STIFFENER SPACING
FIGURE 7-5 STIFFENER SIZE PER STIFFENER SPACING
CHAPTER 8 DUCT SELECTION TABLES " ALUMINUM [Go to Page]
8.1 INTRODUCTION
8.2 SCOPE
8.3 MINIMUM MATERIAL MECHANICAL PROPERTIES
8.4 USE OF THE TABLES
8.5 DESIGN PROCESS
8.6 DUCT SELECTION TABLES
8.7 AUXILIARY TABLES
8-A.X List of 20 ksi Aluminum Tables
8-X List of Auxiliary Aluminum Tables
FIGURE 8-1 CRITICAL LOAD DIAGRAMS FOR WORST CASE CONDITIONS
FIGURE 8-2 STIFFENING GUIDELINES FOR FLAT PANELS
FIGURE 8-3 SAMPLE PANEL CAPACITY OPTIONS FROM TABLE 8-A.2
FIGURE 8-4 PANEL THICKNESS & DEFLECTION PER STIFFENER SPACING
FIGURE 8-5 STIFFENER SIZE PER STIFFENER SPACING
CHAPTER 9 HANGERS AND SUPPORTS [Go to Page]
9.1 INTRODUCTION AND SCOPE
9.2 HANGERS AND SUPPORTS COMMENTARY
9.3 GENERAL GUIDELINES
9.4 METHODS FOR HANGING AND SUPPORTING DUCT
9.5 DUCT HANGERS AND SUPPORTS
9.6 GASKETS, CAULKING, AND JOINT SEALANTS
Table 9-1 Support Capacity of Horizontal Channel
Table 9-2 Support Capacity of Horizontal Angle
Table 9-3 Standard Steel Pipe Column - Load Tables
Table 9-4 Hanger Rod Capacity
Table 9-5 Hanger Bar Capacity
Table 9-6 Hanger Angle Capacity
Table 9-7 Knee Brace Hanger Capacity
Table 9-8 Knee Brace Support Capacity
Table 9-9 Bolt Stress Area
Table 9-10 Grade Markings for Steel Bolts
Table 9-11 Gaskets, Caulking, and Joint Sealants
FIGURE 9-1 HANGER ATTACHMENTS TO STRUCTURES
FIGURE 9-2 UPPER ATTACHMENT DEVICES - TYPICAL
EXAMPLE 9-1. TRAPEZE HANGER
CHAPTER 10 WELDING [Go to Page]
10.1 INTRODUCTION
10.2 WELDED JOINT ACCEPTED INDUSTRY PRACTICE
10.3 WELDED JOINT CONSIDERATIONS
10.4 TYPES OF JOINTS AND EDGE PREPARATION
10.5 WELDING PROCEDURES
10.6 WELDING SYMBOLS
Table 10-1 Allowable Stress For Stitch Welds
Table 10-2 Welded Joint Designs — Butt Joints (B)
Table 10-3 Welded Joint Designs — Corner and Butt Joints (C and B)
Table 10-4 Welded Joint Designs — Corner and Tee Joints (C and T)
Table 10-5 Gas Metal Arc Welding of Carbon Steel
Table 10-6 Shielded Metal Arc Welding (SMAW) of Carbon Steel
Table 10-7 Gas Tungsten Arc Welding (GTAW) of Carbon Steel
Table 10-8 Gas Metal Arc Welding (GMAW) of Galvanized Steel
Table 10-9 Shielded Metal Arc Welding (SMAW) of Galvanized Steel
Table 10-10 Gas Tungsten Arc Welding (GTAW) of Galvanized Steel
Table 10-11 Gas Metal Arc Welding of Stainless Steel
Table 10-12 Shielded Metal Arc Welding (SMAW) of Austenitic Stainless Steel
Table 10-13 Gas Tungsten Arc Welding (GTAW) of Austenitic Stainless Steel
Table 10-14 Gas Metal Arc Welding of Aluminum
Table 10-15 Gas Tungsten Arc Welding (GTAW) of Aluminum
FIGURE 10-1 JOINTS, WELDS, AND GROOVES
FIGURE 10-2 STANDARD LOCATION OF ELEMENTS OF A WELDING SYMBOL
FIGURE 10-3 SUPPLEMENTARY SYMBOLS
FIGURE 10-4 TYPICAL WELD SYMBOLS USED FOR SHEET METAL AND LIGHT PLATE
FIGURE 10-5 PLATE WELDING SYMBOLS
CHAPTER 11 ACCEPTED INDUSTRIAL CONSTRUCTION PRACTICES [Go to Page]
11.1 INTRODUCTION
11.2 COMMON SEAMS AND JOINTS
11.3 FABRICATION TOLERANCES
FIGURE 11-1 LONGITUDINAL SEAMS
FIGURE 11-2 LONGITUDINAL SEAMS (CONTINUED)
FIGURE 11-3 TRANSVERSE SEAMS OR JOINTS
FIGURE 11-4 CROSSBRAKING LIGHT GAGE PANELS
FIGURE 11-5 TYPES OF STIFFENERS
FIGURE 11-6 TYPES OF STIFFENERS (CONTINUED)
FIGURE 11-7 INTERNAL PIPE SUPPORTS
FIGURE 11-8 TYPES OF FLANGED CONNECTIONS
FIGURE 11-9 EXPANSION JOINTS
FIGURE 11-10 FLEXIBLE CONNECTIONS
FIGURE 11-11 ACCESS DOORS
FIGURE 11-12 EXPLOSION DOOR
FIGURE 11-13 VARIOUS FITTINGS
CHAPTER 12 GUIDE SPECIFICATION [Go to Page]
12.1 INTRODUCTION
12.2 DRAWINGS
12.3 SEISMIC RESTRAINT PROVISIONS
12.4 GUIDE SPECIFICATION
APPENDIX A COMMENTARY ON FORMULA DERIVATIONS AND UNITS
APPENDIX B SUPPLEMENTARY DESIGN DATA [Go to Page]
B.1 INTRODUCTION
Table B-1 Conversion of Wind Loads
Table B-2 Insulation Physical Data
Table B-3 Lagging Physical Data
Table B-4 Thermal Expansion Chart
FIGURE B-1 BASIC WIND SPEED (MPH)
FIGURE B-2 SNOW GROUND LOAD " WESTERN U.S. (LB/SQ FT)
FIGURE B-3 SNOW GROUND LOAD " EASTERN U.S. (LB/SQ FT)
FIGURE B-4 GLAZE ICE ACCRETION ZONE
APPENDIX C COMMENTARY ON SURFACE PREPARATION TECHNIQUES [Go to Page]
C.1 INTRODUCTION
C.2 METAL SURFACE PREPARATION
Table C-1 Surface Conditions and Recommended Treatment
Table C-2 Surface Preparation Methods
APPENDIX D REFERENCED DOCUMENTS [Go to Page]
D.1 ASTM STANDARDS
D.2 ANSI STANDARDS
D.3 NFPA STANDARDS
D.4 ASME STANDARDS
D.5 SMACNA STANDARDS
D.6 OTHER STANDARDS
D.7 OTHER RESOURCES
GLOSSARY
INDEX [Go to Page]

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Rectangular Industrial Duct Construction Standards (IP) Version, 2004