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Catalog Composer Document: Pressure Relief Valve Engineering

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Catalog Composer Document: Pressure Relief Valve Engineering PRESSURE RELIEF VALVE ENGINEERING HANDBOOK ANDERSON GREENWOOD, CROSBY AND VAREC PRODUCTS | TECHNICAL PUBLICATION NO. TP-V300 PRESSURE RELIEF VALVE ENGINEERING HANDBOOK FORWARD Copyright © 2012 Emerson. All rights reserved. No part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without written permission. Emerson provides the information herein in good faith but makes no representation as to its comprehensiveness or accuracy. Individuals using this information in this publication must exercise their independent judgment in evaluating product selection and determining product appropriateness for their particular purpose and system requirements. Emerson makes no representations or warranties, either express or implied, including without limitation any warranties of merchantability or fitness for a particular purpose with respect to the information set forth herein or the product(s) to which the information refers. Accordingly, Emerson will not be responsible for damages (of any kind or nature, including incidental, direct, indirect, or consequential damages) resulting from the use of or reliance upon this information. Emerson reserves the right to change product designs and specifications without notice. All registered trademarks are the property of their respective owners. Printed in the USA. 2 PRESSURE RELIEF VALVE ENGINEERING HANDBOOK CONTENTS TABLE OF CONTENTS Chapter 1 - Introduction ........................................................................................................................1.1 Chapter 2 - Terminology .......................................................................................................................2.1 I. General .......................................................................................................................................2.1 II. Types of Devices ........................................................................................................................2.1 III. Parts of Pressure Relief Devices .............................................................................................2.1 IV. Dimensional Characteristics - Pressure Relief Valves ..........................................................2.2 V. Operational Characteristics - Pressure Relief Devices ..........................................................2.3 VI. System Characteristics .............................................................................................................2.4 Chapter 3 - Codes and Standards ........................................................................................................3.1 I. Introduction ...............................................................................................................................3.3 II. American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code ������3.3 III. International Organization for Standardization (ISO) ............................................................3.18 IV. European Union Directives .....................................................................................................3.22 V. American Petroleum Institute (API) .......................................................................................3.23 VI. National Fire Protection Agency (NFPA) ...............................................................................3.26 VII. National Board of Boiler and Pressure Vessel Inspectors ..................................................3.27 Chapter 4 - Design Fundamentals .......................................................................................................4.1 I. Introduction ...............................................................................................................................4.3 II. Direct Spring Operated Pressure Relief Valves ......................................................................4.3 III. Pilot Operated Pressure Relief Valves ...................................................................................4.15 IV. Advantages and Limitations of Valve Types ...........................................................................4.27 Chapter 5 - Valve Sizing and Selection (USCS Units) ..........................................................................5.1 I. Introduction ...............................................................................................................................5.3 II. Gas/Vapor Sizing - Sonic Flow .................................................................................................5.4 III. Gas/Vapor Sizing - Subsonic Flow ...........................................................................................5.5 IV. Steam Sizing ..............................................................................................................................5.5 V. Liquid Sizing.............................................................................................................................5.11 VI. Fire Sizing ................................................................................................................................5.11 VII. Two-Phase Flow Sizing ...........................................................................................................5.18 VIII. Noise Level Calculations ........................................................................................................5.25 IX. Reaction Forces.......................................................................................................................5.26 Chapter 6 - Valve Sizing and Selection (Metric Units) .........................................................................6.1 I. Introduction ...............................................................................................................................6.3 II. Gas/Vapor Sizing - Sonic Flow .................................................................................................6.4 III. Gas/Vapor Sizing - Subsonic Flow ...........................................................................................6.5 IV. Steam Sizing ..............................................................................................................................6.6 V. Liquid Sizing.............................................................................................................................6.11 VI. Fire Sizing ................................................................................................................................6.13 VII. Two-Phase Flow Sizing ...........................................................................................................6.15 VIII. Noise Level Calculations ........................................................................................................6.23 IX. Reaction Forces.......................................................................................................................6.24 C.1 PRESSURE RELIEF VALVE ENGINEERING HANDBOOK CONTENTS TABLE OF CONTENTS (CONTINUED) Chapter 7 - Engineering Support Information (USCS Units) ..............................................................7.1 I. Compressibility Factor ..............................................................................................................7.3 II. Capacity Correction Factor for Back Pressure .......................................................................7.4 III. Capacity Correction Factor for High Pressure Steam ..........................................................7.31 IV. Capacity Correction Factor for Viscosity................................................................................7.31 V. Capacity Correction Factor for Superheat.............................................................................7.33 VI. Ratio of Specific Heats and Coefficient C ..............................................................................7.35 VII. Typical Fluid Properties ..........................................................................................................7.36 VIII. Saturated Steam Pressure Table ...........................................................................................7.40 IX. Orifice Area and Coefficient of Discharge for Anderson Greenwood and Crosby Pressure Relief Valves ............................................................................................................7.41 X. Equivalents and Conversion Factors .....................................................................................7.48 XI. Capacity Correction Factor for Rupture Disc/Pressure Relief Valve Combination ������������7.54 Chapter 8 - Engineering Support Information (Metric Units) .............................................................8.1 I. Compressibility Factor ..............................................................................................................8.3 II. Capacity Correction Factor for Back Pressure .......................................................................8.4 III. Capacity Correction Factor for High Pressure Steam ..........................................................8.31 IV. Capacity Correction Factor for Viscosity................................................................................8.31 V. Capacity Correction Factor for Superheat.............................................................................8.33 VI. Ratio of Specific Heats and Coefficient C ..............................................................................8.35
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