When data is processed through Risk Alive, safeguards and recommendations are categorized into one of the following types.  Safeguards and Recommendations utilize the same categories except for two, which are applied to Recommendations only (see last two items in the list).
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Mechanical Devices are typically used to reduce the risk of hazards present during over-pressure, vacuum, or reverse flow scenarios.

These typically include Relief/Safety Valves, Rupture Disks, Thief Hatch, Vacuum/Vent tube and depressurizing valves designed to provide a relief point that prevents a rupture, large spill, or other uncontrolled release that can cause damage to the vessel.

For example: PSV, PVRV, sometimes regulators.

These also include Check Valves that prevent bulk reverse flow within process operations.

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Mechanical - Passive
These are passive mechanical protection layers that are used to contain a fire or channel the energy of an spill/explosion in a direction that minimizes the spread of damage. These may include dykes, berms, fire blast walls, restriction orifices, mechanical stops, flame arrestors, filters, restriction devices etc.
For example: Berm around 8D-13 Amine Storage Tank.
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Basic Process Control System (BPCS)
Primary Logic system which handles process control and monitoring for a facility or piece of equipment. It takes inputs from sensors and process instrumentation to provide an alarm with operator action output based on an approved design control strategy.
For Example: FIC-233 low flow alarm with operator intervention
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Automated Trip/shutdown/permissive through the Primary Logic system that brings the process to a safe zero energy operating state.
For Example: Automatic closure of the SOV-04123 with shutdown of the J-0493 pump on low level with low level alarm on the LI-04122
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Automated Controller through the Primary Logic system that brings the process to its normal steady operating state
For Example: PIC-34048 on the 34SU-001 will open up to the Acid Gas Flare in order to maintain the pressure at a constant level.
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Safety Instrumented System
A Safety system independent of the process control system. A Safety Instrumented
System (SIS) is composed of separate sensors, logic solvers, and final control
elements for the purpose of taking a process to a safe state when predetermined
conditions are violated (e.g. automated trip/shutdown/permissive). Its only role is
functional safety and no process control is usually performed in this system.
For example: SIF action to close LV 44621 when LALL 44621 on the bottom level
of 44T-303 is activated.
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Safety Instrumented System Alarm
For Example: SIS LAL – 1070A Alarm with operator action.
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Other logic solver alarm (Non-Primary Logic Solver System).  A control system independent of the BPCS.  This category includes Local alarms
For example: PLC – TAL723 01 alarm with operator action.
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Other logic solver trip/shutdown/permissive (Non-Primary Logic Solver System).
For example: PLC function from LALL44700 shuts down 44P-006's.
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Other logic solver controller (Non-Primary Logic Solver System)
For example: PLC Function from LT40027 which opens dump valve to sewer to
maintain level in de-aerator.
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Operating Procedure
Rules and procedures designed to ensure normal operating conditions or unique
operation situations (no time constraint). E.g. equipment on standby, isolation
valves
For example: Flow indication (L1159A/B and L1160A/B) (differential pressure
indication) actively monitored during startup
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Operator Rounds
Inspections carried around site at regular intervals (occurrence). E.g. due diligence, indicator alarm
For example: Visual operator inspection (weekly)
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Occupancy Modifier
A safeguard based on low probability of operator presenting at the hazardous scene
For Example: Personnel in area less than 10% of the time.
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Preventative Maintenance
Maintenance or Management programs in place to prevent against unwanted scenarios or maintain equipment integrity.
For example: Mechanical integrity program inspections and/or tests during turnaround
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Anything that doesn’t fit the above categories (e.g. Inherent design, PPE, EHT, other modifiers)
For example: Coil designs conform with industry design standards, including applicable codes
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A recommendation that is generic in nature or mentions more than one possible option which must be determined upon the implementation of the recommendation.
For example: Review scenario for over-pressure of vessel and implement additional safeguards.
For example: Configure a BPCS trip using LAHH-456, ensure PSV-445 is sized appropriately (not credited previously), and develop an operating procedure for filling crude tanks.
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A recommendation which can eliminate the scenario or reduce the severity of the consequence by changing the process design.
For example: Remove screen on Y-strainer upstream of P-125A/B Coolant Pump, to eliminate potential of Y-strainer plugging leading to pump seal damage.