Ig system & equipment oil tankers
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Cargo Tank Venting & Inert Gas System & Equipment
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Transcript of Ig system & equipment oil tankers
Cargo Tank Venting & Inert Gas System &
Equipment
Cargo Tank Venting & Inert Gas System &
Equipment
On board cargo equipment On board cargo equipment 22
Inert Gas System IntroductionInert Gas System Introduction
On board cargo equipment On board cargo equipment 33
Introduction to Inert Gas System Introduction to Inert Gas System
Introduction
Flammability
Flammable Range
Effect of Increasing Oxygen
Suppression of Flammability by IG
Combustion& Explosion
Inert Gas Prevents FIRE & EXPLOSION
On board cargo equipment On board cargo equipment 44
On board cargo equipment On board cargo equipment 55
On board cargo equipment On board cargo equipment 66
Suppression of Flammability by IGSuppression of Flammability by IG
On board cargo equipment On board cargo equipment 77
Suppression of Flammability by IGSuppression of Flammability by IG
On board cargo equipment On board cargo equipment 88
Effect of Oxygen on Flammable Range Effect of Oxygen on Flammable Range
On board cargo equipment On board cargo equipment 99
Inert Gas Definitions Inert Gas Definitions
On board cargo equipment On board cargo equipment 1010
Inert Gas Must On TankersInert Gas Must On Tankers
Required Under Regulation 60 of SOLAS
For All Petroleum Tankers more than 20,000 DWT –Keel laid after 1-9-84
Exception for Existing Tankers (Keel Laid prior 84)
- i) Tank Washing Machine Capacity less than 60 Cubic Meter/Hour &
- ii) Unreasonable & Impracticable due to design determined by Administration
- iii) For Product Tankers between 20-40,000DWT tank washing Machine Capacity less than 60 cubic meter/Hour
Tankers fitted with IGS to keep COT inerted at all times
On board cargo equipment On board cargo equipment 1111
Inert Gas ProductionInert Gas Production
On board cargo equipment On board cargo equipment 1212
Inert Gas System Inert Gas System
Flue Gas Uptake Valves
Scrubber
I.G. Fans (Blowers)
Gas Regulating Valve
Deck Water Seal
Non Return Valve
Deck Isolating Valve ( Manual)
P/ V Breaker
Instrumentation
Tank Atmosphere Analyzers (Oxygen Analyzers) Fixed & Portable
On board cargo equipment On board cargo equipment 1313
Inert Gas System LayoutInert Gas System Layout
On board cargo equipment On board cargo equipment 1414
Inert Gas System Flow SheetInert Gas System Flow Sheet
On board cargo equipment On board cargo equipment 1515
Inert Gas Lay Out Inert Gas Lay Out
On board cargo equipment On board cargo equipment 1616
Inert Gas Layout SystemInert Gas Layout System
FromFlue Gas Uptake
On board cargo equipment On board cargo equipment 1717
Deck Distribution of Inert Gas System Deck Distribution of Inert Gas System
On board cargo equipment On board cargo equipment 1818
I. G. S. LAYOUTI. G. S. LAYOUT
On board cargo equipment On board cargo equipment 1919
Deck Water Seal RequirementDeck Water Seal Requirement
•Regulation 62 requires that Inert Gas system is equipped with two Non return devices one of which shall be water seal to prevent the return of hydrocarbon to Gas safe spaces
•In addition Regulation 62 requires that arrangement of Deck Water Seal Shall be such that it will prevent back flow of hydrocarbon vapours and ensure proper Functioning of Seal Under Operating Conditions.
On board cargo equipment On board cargo equipment 2020
Deck Water Seal Wet Type Deck Water Seal Wet Type
On board cargo equipment On board cargo equipment 2121
Deck Water Seal Semi DryDeck Water Seal Semi Dry
On board cargo equipment On board cargo equipment 2222
Deck Water Seal Dry TypeDeck Water Seal Dry Type
On board cargo equipment On board cargo equipment 2323
Deck sealDeck seal
Deck seal prevent flow back from deck pipe line to flame area of boilers or scrubbers
Water column works as non returning valve
On board cargo equipment On board cargo equipment 2424
Principle of IG ScrubberPrinciple of IG Scrubber
On board cargo equipment On board cargo equipment 2525
IG ScrubberIG Scrubber
On board cargo equipment On board cargo equipment 2626
IGS types: Inert Gas Generator (FTU) construction -ScrubberIGS types: Inert Gas Generator (FTU) construction -Scrubber
On board cargo equipment On board cargo equipment 2727
Inert Gas System Non Return DevicesInert Gas System Non Return Devices
Reason for Non Return Devices
N/R Consist of Deck Water Seal & Deck Mechanical N/R Valve
Deck Water Seal is a Principal Barrier
Incase of water drop, there should be Low Water Alarm but Seal Should not become Ineffective
Heating Arrangement For Deck Water Seal
Sight Glass & Inspection Opening Provided
Function of Deck Mechanical N/R V/V
Purpose of Separate Deck Isolating Valve
On board cargo equipment On board cargo equipment 2828
Deck Water Seal Wet TypeDeck Water Seal Wet Type
On board cargo equipment On board cargo equipment 2929
Deck Water Seal Semi Dry with Heating SystemDeck Water Seal Semi Dry with Heating System
On board cargo equipment On board cargo equipment 3030
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
Principal work of liquid filled pressure – vacuum deck breakers: in case P/V v/v fails to operate
– Over pressure by IG or Vapour and blow out liquid on deck
– Suction ambient air in gas line and liquid in tank
On board cargo equipment On board cargo equipment 3131
Liquid Filled pressure vacuum breakerLiquid Filled pressure vacuum breaker
On board cargo equipment On board cargo equipment
The Pressure-Relief and Vacuum-Protection System gives an automatically controlled protection against too high or too low pressure within the cargo-handling system
Pressure-relief piping system
Pressure-Relief & vacuum protection System for All Cargo Tanks, as per IMO rules.
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
On board cargo equipment On board cargo equipment 3333
P/V & High Velocity ValvesP/V & High Velocity Valves
On board cargo equipment On board cargo equipment 3434
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
P/V valves
On board cargo equipment On board cargo equipment 3535
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
High velocity vents valve combines the best of modulating valves and full-lift valves.
Valve creates "delayed" blow down of cargo tanks. It reduces vapor loss during low filling rates (and due to sloshing) until venting takes place at full rate when vapor loss is less important.
Valve provides active protection from fire and explosion regardless of pipe configuration.
Valve operates in freezing conditions without heating arrangements.
On board cargo equipment On board cargo equipment 3636
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
Common liquid P/V
On board cargo equipment On board cargo equipment 3737
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems 1,2 Pressure house; Adapter 3,4 Pressure disc and seat 5,6 Booster 7,8,9 Sleeve / Weight / Stem 10 Check lift (pressure unit) 11,12,13 Vacuum house, disc,
seat 14 Filter element 15 Venting cover 16 Check lift (vacuum unit)
On board cargo equipment On board cargo equipment 3838
Methods of Gas ReplacementMethods of Gas Replacement
DILUTION
DISPLACEMENT
Dilution is mixing process, where velocity of incoming Gas is High
Displacement is a Layering Process, where IG has Low Entry Velocity , to enable stable horizontal interface
On board cargo equipment On board cargo equipment 3939
IGS – Arrangement for Gas ReplacementIGS – Arrangement for Gas Replacement
On board cargo equipment On board cargo equipment 4040
IGS – Arrangement for Gas ReplacementIGS – Arrangement for Gas Replacement
On board cargo equipment On board cargo equipment 4141
IG ApplicationIG Application
On board cargo equipment On board cargo equipment 4242
On board cargo equipment On board cargo equipment 4343
Requirement for I G MainRequirement for I G Main
Means for Isolating Each Tank
Breathing Possible when Tanks Isolated from IG Main
Blank Flanges for Slop Tanks & Isolation for OBOs
External IG Supply Connection
Mast Riser or High Velocity Vents Provided for Vapour Displacement
Purge Pipes as Far as practicable from IG inlet
Effective Isolation between IG Main and Cargo piping
One or More P/V Breakers
Provision of Continuous pressure indication of IG
On board cargo equipment On board cargo equipment 4444
Tanker CycleTanker Cycle
On board cargo equipment On board cargo equipment 4545
Inert Gas Application to Various Shipboard OperationsInert Gas Application to Various Shipboard Operations
On board cargo equipment On board cargo equipment 4646
IGS types: Flue Gas SystemIGS types: Flue Gas System
Flue Gas Systems cool and clean flue gas from the ship's boilers, and deliver it to deck, typically during cargo unloading and tank washing.
Flue gas already contains less than 5% oxygen, which is the IMO higher limit for inert gas, no further treatment is therefore necessary.
The main components are the scrubber unit, inert gas blowers, the deck water seal, main non-return valve, the pressure/vacuum breaker, valves, instrumentation and the control system.
Surplus gas is automatically re-circulated back to the scrubber unit, and gas production hence follows gas demand.
The system can also, like the other variants dealt with in this presentation, be preset to deliver fresh air for gas-freeing purposes.
On board cargo equipment On board cargo equipment 4747
IGS types: Inert Gas Generator IGS types: Inert Gas Generator
Inert Gas Generator Systems is used when no existing supply of flue gas is available.
The scrubber unit of the flue gas system is here integrated into a generator unit consisting of a combined burner part and scrubber part, both sea water cooled. MDO or HFO fuel is burning in the horizontal combustion chamber to produce flue gas with an oxygen content of typically 2-4%.
The gas then enters the scrubber part, where it is cooled and cleaned by sprayed sea water before being piped to the deck area.
On board cargo equipment On board cargo equipment 4848
Tank Pressure & Oxygen ConcentrationTank Pressure & Oxygen Concentration
On board cargo equipment On board cargo equipment 4949
MMC Ullaging DeviceMMC Ullaging Device
On board cargo equipment On board cargo equipment 5050
Flammability Composition DiagramFlammability Composition Diagram
On board cargo equipment On board cargo equipment 5151
Isolation of Cargo Tanks from IG Deck MainIsolation of Cargo Tanks from IG Deck Main
On board cargo equipment On board cargo equipment 5252
Cargo tank vent systemCargo tank vent system
On board cargo equipment On board cargo equipment 5353
Monitoring of IG PlantMonitoring of IG Plant
On board cargo equipment On board cargo equipment 5454
Inert Gas systemsInert Gas systems
Carbon dioxide (IG) generation system
– Burning fuel for generation carbon dioxide gas is common procedure on gas tankers
– Take off carbon dioxide gas form boilers
Inert Gas (IG) is sent via drier / non returning valves and used for replacing air to prevent explosion concentrations :
– in Cargo Tanks and
– in Ballast tanks (some times).
IG can be supplied from the shore facilities in emergency condition
On board cargo equipment On board cargo equipment 5555
IGS types: Flue Gas SystemIGS types: Flue Gas System
On board cargo equipment On board cargo equipment 5656
IGS types: Flue Gas System with Topping Up Generator IGS types: Flue Gas System with Topping Up Generator
This alternative consists of a flue gas system supplemented by a separate small (500Nm3/h) inert gas generator, and is often preferred to aboard OBO and VLCCs
The flue gas system covers the bulk of the inerting during cargo unloading etc., and the topping up generator tops up tank pressures during the sea voyage.
On board cargo equipment On board cargo equipment 5757
IGS types: Inert Gas Generator (FTU) constructionIGS types: Inert Gas Generator (FTU) construction
- Panel- Generator- Fan- Scrubber
On board cargo equipment On board cargo equipment 5858
IGS types: Inert Gas Generator (IGG)IGS types: Inert Gas Generator (IGG)
Moss Inert Gas Generators for Oil/ Chemical/ Products
Moss Inert Gas Generators for LPG/LNG
On board cargo equipment On board cargo equipment 5959
IGS types: FlexinertIGS types: Flexinert
Flexinert is a fuel-saving combination of a flue gas system and an inert gas generator.
As long as sufficient boiler flue gas is available, Flexinert works as a flue gas system. When no basis gas is available, it works as an inert gas generator, and when high-oxygen exhaust gas from the main engines or diesel generators is available, it afterburns this gas to produce inert gas with the acceptable oxygen content.
Afterburning saves fuel since the combustion "air" already has a reduced oxygen content.
On board cargo equipment On board cargo equipment 6060
Inert Gas Generator (IGG) – outputInert Gas Generator (IGG) – output
Oxygen: 0.5% - 1%
Carbon Dioxide: ~ 14 %
Nitrogen: ~ 85%
Carbon Monoxide, oxides of Nitrogen and Sulphur Dioxide: ~ 0,5%
– Carbon Monoxide: Max 100 ppm
– Oxides of Nitrogen: Max 100 ppm
– Sulphur Dioxide: Max 1 ppm
Moisture: Dew Point of -45C
Modes: Inerting
On board cargo equipment On board cargo equipment 6161
Deck sealDeck seal
On board cargo equipment On board cargo equipment 6262
Deck sealDeck seal
On board cargo equipment On board cargo equipment 6363
Ballast tank inertingBallast tank inerting
Ballast tanks are inerted in emergency conditions
Flexible Hose used for inerted operation
Pressure 250 mmWC,
On board cargo equipment On board cargo equipment 6464
Pressure-Relief & vacuum protection SystemsPressure-Relief & vacuum protection Systems
Vent riser
