1. Safety Risk
Chemical Hazard (CH)
Assess the chemical hazard (CH). Select the highest values of NFPA lire health and
reactivity ratings for chemicals handled by equipment.
Capital Risk
Mean Time Between Failure
Process and Production Demand Risk
Assess the process criticality PC:
PC = 4: Equipment critical for process capability. Failure of equipment will cause
complete loss of production.
PC = 3; Failure of equipment will result in loss of one stream or require product.
PC = 2: Loss of equipment forces recirculation or immediate storage, or causes long
term loss of efficiency or reliability.
PC = 1: Loss of product optimization or advanced control
PC = 0: Equipment does not affect process capability.
Process spare equipment factor (PSE):
PSE = 1: If an in-line spare Of process option exists that mitigates the process
consequence, otherwise PSE = 0.
Production demand
PDR = 4, Demand requires process unit to operate from 91-100% of full capacity.
PDR = 3, Demand requires process unit to operate from 70-90% of full capacity.
PDR = 2, Demand requires process unit to operate from 40-69% of full capacity.
PDR = 1, Demand requires process unit to operate from <40% of full capacity.
PDR = 0, Unit is not in operation.
Environmental Risk
Assess other hazards(OH):
Highly hazardous= 4:
Pollution-control Systems where failure would result in environmental damage.
Hazardous = 3:
pollution control systems where failure might result in environmental damage.
Moderately hazardous= 2:
Chemicals released with potential for long term health or environmental impacts
Slightly hazardous = 1. Not hazardous = 0
Hazard risk reduction factor HRR.
HRR = 0: Potential for an incident is high or serious health safety or environmental
consequences.
HRR = 1: Potential for an incident is low.
HRR = 4: Potential exists for an incident, nor for health, safety, or environmental.
Hazard spare equipment factor HSE
HSE = 1: if an in-tine spare or process option exists that mitigates the hazard,
otherwise,
HSE= 0.

2. HCR
Hazard criticality rating.
PCR
Net process criticality rating.
(PC)
Assess the process
criticality
(PSE)
Process spare
equipment factor
(CH) Chemical Hazard
(HRR )
Hazard risk
reduction factor
(HSE)
Hazard spare
equipment factor
PHCR
Process and hazard
criticality ranking
PDR
Product demand
PCR’
Modified Net process criticality rating.
MTBF
Mean time between
failure.
CRI
Rotating Equipment Criticality Index.
Vibration Inspection Interval (Below 7 days OR Monthly, Quarterly, Yearly).
(OH) Environmental Hazard