Table of Contents
List of Sections
INTERPRETATIONS
CODE CASES
Foreword
Statement of Policy on the Use of the Certification Mark and Code Authorization in Advertising
Statement of Policy on the Use of ASME Marking to Identify Manufactured Items
Submittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees
1 Introduction
2 Inquiry Format
3 Code Revisions or Additions
4 Code Cases
5 Code Interpretations
6 Submittals
Personnel
Organization of Section III
1 General
2 Subsections
3 Articles
4 Subarticles
5 Subsubarticles
6 Paragraphs
7 Subparagraphs
8 Subsubparagraphs
9 References
Special Notice
Summary of Changes
List of Changes in Record Number Order
Cross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code
Subparagraph Breakdowns/Nested Lists Hierarchy
Footnotes
Submittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees
Cross-References
Article NH-1000 Introduction
NH-1100 Scope
NH-1110 Aspects of Construction Covered by These Rules
NH-1120 Temperature and Service Life Limits
NH-1130 Organization of Subsection NH Rules
Article NH-2000 Material
NH-2100
NH-2120 Pressure-Retaining Materials
NH-2160 Deterioration of Material in Service
NH-2400
NH-2430
NH-2500
NH-2530
NH-2800 Fatigue Acceptance Test
Article NH-3000 Design
NH-3100 General Requirements for Design
NH-3110 Scope, Acceptability, and Loadings
NH-3120 Special Considerations
NH-3130 General Design Rules
NH-3200 Design by Analysis
NH-3210 Design Criteria
NH-3220 Design Rules and Limits for Load-Controlled Stresses in Structures Other Than Bolts
NH-3230 Stress Limits for Load-Controlled Stresses on Bolts
NH-3240 Special Requirements for Elevated Temperature Components
NH-3250 Limits on Deformation-Controlled Quantities
NH-3300 Vessel Designs
NH-3310 General Requirements
NH-3330 Openings and Reinforcement
NH-3350 Design of Welded Construction
NH-3360 Special Vessel Requirements
NH-3400 Design of Class 1 Pumps
NH-3410 General Requirements
NH-3420 Design Considerations
NH-3430 Pump Types
NH-3500 Design of Class 1 Valves
NH-3510 Design Requirements
NH-3520
NH-3540
NH-3550 Cyclic Loading Requirements
NH-3600 Piping Design
NH-3610 General Requirements
NH-3620 Design Considerations
NH-3640 Pressure Design of Components
NH-3650 Analysis of Piping Components
NH-3660 Design of Welds
NH-3670 Special Piping Requirements
Article NH-4000 Fabrication and Installation
NH-4100 General Requirements
NH-4110 Introduction
NH-4200
NH-4210
NH-4240 Special Joints and Fittings โ Added Rules for NBโ4240
NH-4400
NH-4420
Article NH-5000 Examination
NH-5100 General Requirements for Examination
NH-5110 General Requirements
NH-5130 Examination of Weld Edge Preparation Surfaces
NH-5200 Required Examination of Welds
NH-5210 Category A Vessel Welded Joints and Longitudinal Welded Joints in Other Components
NH-5220 Category B Vessel Welded Joints and Circumferential Welded Joints in Other Components
NH-5230 Category C Vessel Welded Joints and Similar Welded Joints in Other Components
NH-5240 Category D Vessel Welded Joints and Branch and Piping Connections in Other Components
NH-5260 Fillet, Socket, and Attachment Welds
Article NH-6000 Testing
NH-6100 General Requirements
NH-6110 Scope of Testing
NH-6120 Preparation for Testing
NH-6200 Hydrostatic Tests
NH-6210 Hydrostatic Testing Procedure
NH-6220 Hydrostatic Test Pressure Requirements
NH-6300 Pneumatic Tests
NH-6310 Pneumatic Testing Procedures
NH-6320 Pneumatic Test Pressure Requirements
NH-6400 Pressure Test Gages
Article NH-7000 Overpressure Protection
NH-7100 General Requirements
NH-7110 Scope
NH-7130 Verification of the Operation of Pressure Relief Devices
NH-7170 Permitted Use of Pressure Relief Devices
NH-7200 Content of Overpressure Protection Report
NH-7300 Relieving Capacity
NH-7600 Nonreclosing Pressure Relief Devices
NH-7610 Use of Rupture Disk Devices
NH-7620
Mandatory Appendices
Mandatory Appendix NH-I-14 Tables and Figures
Nonmandatory Appendices
Nonmandatory Appendix NH-T Rules for Strain, Deformation, and Fatigue Limits at Elevated Temperatures
NH-T-1100 Introduction
NH-T-1110 Objective
NH-T-1120 General Requirements
NH-T-1200 Deformation Limits for Functional Requirements
NH-T-1210 Statement in Design Specification
NH-T-1220 Elastic Analysis Method
NH-T-1230 Use of Inelastic Analysis
NH-T-1300 Deformation and Strain Limits for Structural Integrity
NH-T-1310 Limits for Inelastic Strains
NH-T-1320 Satisfaction of Strain Limits Using Elastic Analysis
NH-T-1330 Satisfaction of Strain Limits Using Simplified Inelastic Analysis
NH-T-1400 CreepโFatigue Evaluation
NH-T-1410 General Requirements
NH-T-1420 Limits Using Inelastic Analysis
NH-T-1430 Limits Using Elastic Analysis
NH-T-1500 Buckling and Instability
NH-T-1510 General Requirements
NH-T-1520 Buckling Limits
NH-T-1700 Special Requirements
NH-T-1710 Special Strain Requirements at Welds
NH-T-1720 Strain Requirements for Bolting
NH-T-1800 Isochronous StressโStrain Relations
NH-T-1810 Objective
NH-T-1820 Materials and Temperature Limits
Nonmandatory Appendix NH-U Guidelines for Restricted Material Specifications to Improve Performance in Certain Service Applications
NH-U-1100 Scope
NH-U-1110 Objectives
NH-U-1200 Service Conditions
NH-U-1300 Recommended Restrictions
Endnotes
Figures
NH-3221-1 Flow Diagram for Elevated Temperature Analysis
NH-3224-1 UseโFractions for Membrane Stress
NH-3224-2 UseโFractions for Membrane Plus Bending Stress
NH-3351-1 Welded Joint Locations Typical of Categories A, B, C, and D
NH-3352-1 Typical Butt Joints
NH-3354-1 Permissible Attachment Weld Location
NH-3361-1 Category A and B Joints Between Sections of Unequal Thickness
NH-3410.2-1 Typical Single Volute Casing
NH-3410.2-2 Typical Double Volute Casing
NH-3421.11-1 Minimum Tangential Inlet and Outlet Wall Thickness
NH-4212-1 Permissible Time/Temperature Conditions for Material Which Has Been Cold Worked > 5% and < 20% and Subjected to ShortโTime High Temperature Transients
NH-T-1432-1 StressโStrain Relationship
Tables
NH-3133-1 Size Restrictions on Connections
NH-3217-1 Classification of Stress Intensity in Vessels for Some Typical Cases
NH-3217-2 Classification of Stress Intensity in Piping, Typical Cases
NH-3225-1 Tensile Strength Values, Su
NH-3225-2 Tensile and Yield Strength Reduction Factor Due to Long Time Prior Elevated Temperature Service
NH-3225-3A Yield Strength Reduction Factors for 21/4Crโ1Mo
NH-3225-3B Tensile Strength Reduction Factors for 21/4Crโ1Mo
NH-3225-4 Tensile Strength Reduction Factors for 9Crโ1MoโV
NH-3642.1-1 Bend Radius Versus Thickness
NH-U-1 Recommended Restrictions