ABS-131-2004.pdf
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1、 GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS JUNE 2004 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2004 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Copyright American Bureau of Shipping Provided by IHS
2、 under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/59107
3、70001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS . 2004 iii Foreword The main purpose of this Guide is to provide vessel Owners with design criteria for inerting ballast tanks on doubl
4、e hull tankers. The ballast tanks are to be inerted for the following reasons: To minimize risk of explosion in ballast tanks To minimize corrosion ABS welcomes comments and suggestions for improvement of this Guide. Comments or suggestions can be sent electronically to rddeagle.org. Copyright Ameri
5、can Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under lic
6、ense with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS . 2004 v GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS CONTENTS SECTION 1 General Conditions1 1 Ap
7、plication .1 3 Objective1 5 Definitions 1 7 Plans and Data to be Submitted2 9 Class Notation2 SECTION 2 System Design .3 1 Inert Gas System.3 1.1 General .3 1.3 Dedicated Inert Gas System for Ballast Tanks3 1.5 Common Inert Gas Systems for Ballast Tanks and Cargo Tanks .3 1.7 Basic Requirements4 1.9
8、 Inert Gas Quality.4 1.11 Source of Inert Gas.4 1.13 Flue Gas Isolating Valves .4 1.15 Flue Gas Scrubber5 1.17 Blowers .5 1.19 Flue Gas Leakage.6 1.21 Gas Regulating Valve .6 1.23 Non-return Devices.6 1.25 Branching of Inert Gas Main .7 1.27 Venting for Large Gas Volumes8 1.29 Inerting, Purging or G
9、as-freeing of Empty Tanks8 1.31 Pressure/Vacuum-breaking Devices.8 1.33 Instrumentation at Gas Blower Outlets9 1.35 Monitoring of Inert Gas9 1.37 Portable Detectors 9 1.39 Calibration of Instruments .9 1.41 Alarms and Shutdowns .9 1.43 Nitrogen Generator Inert Gas Systems.11 Copyright American Burea
10、u of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- vi ABS GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS . 2004 3 Ballast Tanks Venting13 3.1 General Principles
11、.13 3.3 Venting Capacity.13 3.5 Vent Piping13 3.7 Self-draining of Vent Piping.14 3.9 Protection for Tank Overpressurization and Vacuum14 3.11 Position of Pressure/Vacuum Valves 14 3.13 Pressure/Vacuum Valve Bypass.15 3.15 Vent Outlets for Large Flow Volumes15 5 Ballast Tank Gas Detection System15 5
12、.1 Portable Gas Measuring Detectors .15 5.3 Fixed Gas Sampling System.15 5.5 Piping of Gas Sampling Lines .15 5.7 Gas Sampling System Installation.16 7 Ballast Tank Level Gauging.16 7.1 Tank Overfill Protection.16 9 Ballast Pump Operation.17 11 Operating Manuals.17 SECTION 3 Survey Requirements19 1
13、New Construction.19 3 Annual Survey19 3.1 Inert Gas Systems.19 5 Special Periodical Survey22 5.1 General22 5.3 Separate Inert Gas Generator System22 5.5 Gas Stored in Bottles System22 APPENDIX 1 Examples of Inerting/Gas Freeing Analysis of Ballast Tank.23 1 Introduction 23 3 Descriptions of Ballast
14、Tank 24 3.1 Dimensions of Ballast Tank.24 3.3 Transverse Bulkheads and Frames.24 3.5 Stringers25 3.7 Girders.25 3.9 Discharge Pipe and Gas Outlet.25 3.11 Simulation Model.25 5 Results.25 5.1 Inerting 26 5.3 Gas-freeing29 7 Conclusions .32 TABLE 1 Composition of Gases26 Copyright American Bureau of S
15、hipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS . 2004 vii FIGURE 1 Ballast Tank with Discharge Pipe 24 FIGURE 2
16、(a) Inerting at 0.5 hr (1800 seconds), 0.33 Atmosphere Changes.26 FIGURE 2(b) Inerting at 1.0 hr (3600 seconds), 0.67 Atmosphere Changes.27 FIGURE 2(c) Inerting at 1.5 hr (5400 seconds), 1.0 Atmosphere Change.27 FIGURE 2(d) Inerting at 2.25 hr (8100 seconds), 1.5 Atmosphere Changes.28 FIGURE 2(e) In
17、erting at 3.0 hr (10800 seconds), 2.0 Atmosphere Changes.28 FIGURE 3(a) Gas-freeing at 0.5 hr (1800 seconds), 0.33 Atmosphere Changes29 FIGURE 3(b) Gas-freeing at 1.0 hr (3600 seconds), 0.67 Atmosphere Changes30 FIGURE 3(c) Gas-freeing at 1.5 hr (5400 seconds), 1.0 Atmosphere Change30 FIGURE 3(d) Ga
18、s-freeing at 2.25 hr (8100 seconds), 1.5 Atmosphere Changes31 FIGURE 3(e) Gas-freeing at 3.0 hr (10800 seconds), 2.0 Atmosphere Changes31 FIGURE 4 Averaged Oxygen Concentrations.32 APPENDIX 2 Pump Certification (4-6-1/7.3 of the Rules for Building and Classing Steel Vessels)33 Copyright American Bur
19、eau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license wi
20、th ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 20:27:44 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDE FOR INERT GAS SYSTEM FOR BALLAST TANKS . 2004 1 S E C T I O N 1 General Conditions 1 Application The requirements in this Guide apply to vessel
21、s equipped with inert gas systems designed to continuously inert the ballast tanks. Application of the requirements of this Guide is optional. When a vessel is designed, built and surveyed in accordance with this Guide, and when found satisfactory, a classification notation, as specified in Subsecti
22、on 1/9, will be granted. 3 Objective The objective of this Guide is to provide requirements which will: i) Prevent the risk of explosion in ballast tanks caused by the ignition of hydrocarbon gas leaking in from adjacent cargo tanks ii) Reduce corrosion in ballast tanks This is achieved by means of
23、replacing the atmospheric content of the tanks with a gas such as nitrogen, or a mixture of gases such as flue gas, containing reduced levels of oxygen. 5 Definitions The following definitions are applied to the terms used in this Guide: Inert gas: Inert gas is a gas such as nitrogen or a mixture of
24、 gases such as flue gas, containing a reduced level of oxygen, which will decrease corrosion rate and is insufficient to support the combustion of hydrocarbons. Inert condition: An inert condition exists when the oxygen content throughout the atmosphere of a tank has been reduced to 5% or less by vo
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