EMERGENCY SHUTDOWN SYSTEM — SOLAS

ESD CONTROLS

Manual ESD Activation

System Control

Auto Triggers

Shore ESD Link

Hardwired Link

Fibre Optic Link

Battery Backup100%

ESD SYSTEM SCHEMATIC — CARGO AREA OVERVIEW

ZONE STATUS

Cargo Manifold NORMAL

Cargo Pumps RUNNING

Engine Room NORMAL

HVAC Systems RUNNING

Alarms

Awaiting scenario...

ESD TRIP LOG

-- ESD system initialised — SIL 2 --

MANIFOLD VALVE MATRIX

Port Side (P01–P04)

P01
OPEN

P02
OPEN

P03
OPEN

P04
OPEN

Starboard Side (S01–S04)

S01
OPEN

S02
OPEN

S03
OPEN

S04
OPEN

Pump ESD Valves

CP-01
OPEN

CP-02
OPEN

CP-03
OPEN

SP-01
OPEN

SYSTEM PARAMETERS

Cargo Tank Pressure0.18bar

Gas Level — Manifold2.1%LEL

Battery Backup100%

Valves Open8/ 8

ESD Level: NORMAL

Zones Tripped: 0 / 4

SIL Rating: SIL 2 (IEC 61508)

Last Reset: Never

Reset Status: READY

ESD SYSTEM — FULL P&ID SCHEMATIC

P&ID LEGEND & ANNOTATIONS

INSTRUMENT TAGS

ESDV-xxxESD Valve

SDV-xxxShutdown Valve

PAHH-xxxPressure High-High

LAHH-xxxLevel High-High

TAHH-xxxTemp High-High

GD-xxxGas Detector

FD-xxxFlame Detector

REGULATORY REFERENCE

IGC Code §16 Emergency Shutdown requirements for gas carriers. ESD must close all liquid and vapour valves on cargo system within defined time.

IEC 61508 SIL 2 Safety Integrity Level 2 — probability of failure on demand 10⁻³ to 10⁻². Requires redundant logic solver and periodic proof testing.

SOLAS II-2 Reg. 4 Fire protection and detection. ESD must interface with fixed fire-fighting system to ensure concurrent suppression.

LOGIC SOLVER STATUS

LS-A (Primary)HEALTHY

LS-B (Redundant)HEALTHY

Vote Logic1oo2

WatchdogOK

CommsOK

ESD CAUSE & EFFECT MATRIX — LOGIC DIAGRAM

ESD LEVEL ACTIONS

LEVEL 1 — CARGO STOP

Triggered by: manual, overpressure, high-high level

Stop all cargo pumps

Close manifold ESDVs

Alarm shore ESD link

Initiate PA announcement

LEVEL 2 — FULL ESD

Triggered by: gas detection ≥40%LEL, manual, fire

All Level 1 actions

Close all cargo valves

Stop compressors

Isolate ER fuel supply

Activate ventilation ESD

Shore link trip signal

LEVEL 3 — FULL SHIP

Triggered by: manual bridge/CCR, fire detection

All Level 1 & 2 actions

Close all F.O. shutoffs

Initiate CO₂ / deluge

Muster alarm

Bridge & CCR notification

GMDSS distress relay

ESD VALVE OVERVIEW — ALL ZONES

VALVE LINEUP

PORT MANIFOLD

CMOV-P01Port liq. transfer

CMOV-P02Port vapour return

CMOV-P03Port stripping

CMOV-P04Port recirculation

STARBOARD MANIFOLD

CMOV-S01Stbd liq. transfer

CMOV-S02Stbd vapour return

CMOV-S03Stbd stripping

CMOV-S04Stbd recirculation

PUMP ROOM

ESDV-CP1CP-01 discharge

ESDV-CP2CP-02 discharge

ESDV-CP3CP-03 discharge

ESDV-SP1SP-01 discharge

ENGINE ROOM

SDV-ER01Main eng F.O. supply

SDV-ER02Gen F.O. supply

SDV-ER03Emerg gen supply

CARGO MANIFOLD — ESD VALVE DETAIL

MANIFOLD CONTROLS

MANIFOLD STATUS

Port ManifoldNORMAL

Stbd ManifoldNORMAL

Drip Tray LevelNORMAL

Hose ConnectionCONNECTED

QUICK-CLOSING VALVES

CMOV-P01OPEN

CMOV-P02OPEN

CMOV-P03OPEN

CMOV-P04OPEN

CMOV-S01OPEN

CMOV-S02OPEN

CMOV-S03OPEN

CMOV-S04OPEN

MANIFOLD ESD ACTIONS

SHORE LINK — MANIFOLD

ESD Signal Out

ESD Signal In

Link IntegrityOK

FIXED GAS DETECTION SYSTEM — CARGO AREA

GAS DETECTOR STATUS

DETECTOR READINGS (%LEL)

Manifold Area (GD-01)2.1

Pump Room (GD-02)0.8

Compressor Room (GD-03)1.4

HVAC Intake (GD-04)0.3

Void Space Fwd (GD-05)0.0

Void Space Aft (GD-06)0.0

ALARM THRESHOLDS

Warning (Level 1)10% LEL

ESD Trigger (Level 2)40% LEL

Voting Logic2oo3

SYSTEM HEALTH

ControllerHEALTHY

Power SupplyOK

Last Calibration14 DAYS AGO

Next Service16 DAYS

TEST / SIMULATE

FIRE & FLAME DETECTION SYSTEM — SOLAS II-2

FIRE DETECTION STATUS

FLAME DETECTORS

FD-01 Manifold PortNORMAL

FD-02 Manifold StbdNORMAL

FD-03 Pump RoomNORMAL

FD-04 Comp RoomNORMAL

FD-05 Engine RoomNORMAL

HEAT / SMOKE DETECTORS

HD-01 Pump RoomNORMAL

HD-02 Engine RoomNORMAL

SD-01 CCRNORMAL

SD-02 AccommodationNORMAL

SUPPRESSION SYSTEMS

CO₂ SystemARMED

Water DelugeSTANDBY

Dry PowderREADY

Foam SystemREADY

FIRE ESD ACTIONS

HVAC & VENTILATION SYSTEM — ESD ISOLATION

VENTILATION CONTROLS

SYSTEM STATUS

Accommodation HVACRUNNING

CCR HVACRUNNING

Engine Room Vent.RUNNING

Cargo Hold Vent.RUNNING

Pump Room Vent.RUNNING

DAMPER STATUS

Accomm Intake DamperOPEN

CCR RecirculationAUTO

ER Exhaust DamperOPEN

Mast Riser DamperOPEN

ESD VENTILATION RESPONSE

On ESD Level 2+: Accommodation HVAC switches to recirculation. Cargo area ventilation stops. Pump room exhaust fan trips.

Auto ResponseARMED

MANUAL OVERRIDE

MUSTER STATIONS & EVACUATION PLAN

MUSTER & PA CONTROLS

MUSTER STATIONS

Station A — Bridge DeckSTANDBY

Station B — Boat DeckSTANDBY

Station C — Fwd DeckSTANDBY

Station D — EmbarkationSTANDBY

PA SYSTEM

PA StatusREADY

General AlarmOFF

Abandon ShipOFF

LIFESAVING APPLIANCES

Lifeboat FwdREADY

Lifeboat AftREADY

Rescue BoatREADY

Life Rafts4 × READY

ALARM ACTIVATION

ESD RESET PROCEDURE — STEP-BY-STEP SEQUENCE

RESET PREREQUISITES

01 Identify and confirm ESD cause cleared

02 Gas detectors showing <5%LEL in all zones

03 Fire detection system: no active alarms

04 All personnel accounted for — muster complete

05 Master / Duty Officer authorisation obtained

06 Shore party notified and agreed to reset

07 Logic solver healthy — both channels OK

08 Insert key and hold RESET (3 seconds)

RESET STATUS

Current ESD Level: NORMAL

Steps Confirmed: 0 / 8

Reset Ready: NO

Last Reset By: —

Last Reset Time: —

VALVE RE-OPEN SEQUENCE

After reset confirmation, valves are re-opened in sequence per IGC Code §16.5. Each valve is verified open before next is released.

Sequence Step—

Active Valve—

Sequence StatusIDLE

SYSTEM INTERLOCKS

SIL-2 Logic SolverHEALTHY

Watchdog TimerOK

Comms (MODBUS)OK

Vote: 1oo2ARMED

PROCESS TRENDS — ESD PARAMETERS

TREND CONTROLS

TREND SELECTION

Tank Pressure (bar) Gas — Manifold (%LEL) Gas — Pump Room (%LEL) Battery Backup (%) ESD Level

TIMEBASE

CURRENT VALUES

Tank Pressure0.18 bar

Gas — Manifold2.1 %LEL

Gas — Pump Room0.8 %LEL

Battery Backup100 %

ESD LevelNORMAL

EXPORT