Table 4.

Automatically created extended HAZOP worksheet for the deviations ‘high level’ and ‘low level’.

Pos.	Unit	Id.	Substance	Deviation	Super cause	Cause	Effect	Consequence	Safeguard
1	StorageTankUnit	T-301	Hexane	HighLevel	–	ExcessiveInflow	Overfilling	LossOfPrimaryContainment, Fire	CollectingBasin, OverfillProtection
2	StorageTankUnit	T-301	Hexane	HighLevel	–	ExcessiveInflow	Overfilling	LossOfPrimaryContainment, FormationOfExAtmosphere, Explosion	CollectingBasin, DefineExProtectionZone, OverfillProtection
3	StorageTankUnit	T-301	Hexane	HighLevel	OperationalError, ValveFailure	ClosedOutletValve	Overfilling	LossOfPrimaryContainment, Fire	CollectingBasin, OverfillProtection
4	StorageTankUnit	T-301	Hexane	HighLevel	OperationalError, ValveFailure	ClosedOutletValve	Overfilling	LossOfPrimaryContainment, FormationOfExAtmosphere, Explosion	CollectingBasin, DefineExProtectionZone, OverfillProtection
5	StorageTankUnit	T-301	Hexane	HighLevel	–	MalfunctionFlow-Controller	Overfilling	LossOfPrimaryContainment, Fire	CollectingBasin, OverfillProtection
6	StorageTankUnit	T-301	Hexane	HighLevel	–	MalfunctionFlow-Controller	Overfilling	LossOfPrimaryContainment, FormationOfExAtmosphere, Explosion	CollectingBasin, DefineExProtectionZone, OverfillProtection
7	StorageTankUnit	T-301	Hexane	LowLevel	DepositionO-fImpurities	BlockedInflowLine	PumpRunningDry	PumpBreakdown, ProductionDowntime	DryRunProtection, LevelControllerLowAlarm
8	StorageTankUnit	T-301	Hexane	LowLevel	HumanError, OperationalError, ValveFailure	ClosedInletValve	PumpRunningDry	PumpBreakdown, ProductionDowntime	DryRunProtection, LevelControllerLowAlarm
9	StorageTankUnit	T-301	Hexane	LowLevel	HumanError, OperationalError, ValveFailure	ClosedInletValve	EmptyingOf-Container	ProductionDowntime	LevelControllerLowAlarm
10	StorageTankUnit	T-301	Hexane	LowLevel	–	MalfunctionFlow-Controller	EmptyingOf-Container	ProductionDowntime	LevelControllerLowAlarm
11	StorageTankUnit	T-301	Hexane	LowLevel	OperationalError	LossOfInflow	PumpRunningDry	PumpBreakdown, ProductionDowntime	DryRunProtection, LevelControllerLowAlarm
12	StorageTankUnit	T-301	Hexane	LowLevel	OperationalError	LossOfInflow	EmptyingOfContainer	ProductionDowntime	LevelControllerLowAlarm