5 types of shut downs

ESD emergency shut down staged start up/shutdown unplanned shutdown planned startup/shutdown delayed shutdown

purpose and design of effective alarms

Alert- to attract operator attention Inform- to tell operator what problem is Guide- direct operator the initial corrective actions.

Emergency, high, low. operators know which to address as priority

HASAWA 1974 states what about alarms

That there is a general duty to ensure safety

COMAH regulations 2015 state

specific duties for sites with major accident hazards

industry best practice: EEMUA 191

provide detailed, practical guidance needed to meet legal obligations and achieve effective alarm management.

occy health and safety- health, safety and welfare of all employees, includes providing and maintaining safe plant and systems of work

sites with large quantities of dangerous substances, COMAH mandates rigorous and demonstrable checks of safety critical systems like control and emergency shutdowns

standard for design and management of safety instrumented systems SIS. provides rigorous lifecycle framework for ensuring critical last line of defence systems work

what is a SCE Safety Critical Element

any component, system or procedure whose failure could directly lead to major accident-i.e emergency shutdown systems, pressure valves, fire and gas detection, control room alarms

what is a PS Performance standard

a PS is a formal document that defines measurable criteria for a SCE. standard specify precise function, availability, reliability, survivability and inspection.

Process Hazard Analysis PHA

PHA is a systematic, rigorous method for ID and evaluating potential hazards associated with industry process- HAZOPS used to ensure SCE in place. COMAH requirement.

FARSI- frequency, availability, reliability, survivability, inspection

a comprehensive framework used to define and assess performance standards for SCE

how often the SCE mist be tested or inspected.

the probability that the SCE is operational when demanded e.g 99.9% uptime

the ability of the SCE to perform correctly without failure e.g minimal rate of false alarms

the ability of the SCE to function during and after emergency conditions e.g fire resistant cabling or components

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safe start upshutdow

Question	Answer
5 types of shut downs	ESD emergency shut down staged start up/shutdown unplanned shutdown planned startup/shutdown delayed shutdown
purpose and design of effective alarms	Alert- to attract operator attention Inform- to tell operator what problem is Guide- direct operator the initial corrective actions.
alarms are ranked by	Emergency, high, low. operators know which to address as priority
HASAWA 1974 states what about alarms	That there is a general duty to ensure safety
COMAH regulations 2015 state	specific duties for sites with major accident hazards
industry best practice: EEMUA 191	provide detailed, practical guidance needed to meet legal obligations and achieve effective alarm management.
HASAW 1974	occy health and safety- health, safety and welfare of all employees, includes providing and maintaining safe plant and systems of work
COMAH 2015	sites with large quantities of dangerous substances, COMAH mandates rigorous and demonstrable checks of safety critical systems like control and emergency shutdowns
IEC 61511	standard for design and management of safety instrumented systems SIS. provides rigorous lifecycle framework for ensuring critical last line of defence systems work
what is a SCE Safety Critical Element	any component, system or procedure whose failure could directly lead to major accident-i.e emergency shutdown systems, pressure valves, fire and gas detection, control room alarms
what is a PS Performance standard	a PS is a formal document that defines measurable criteria for a SCE. standard specify precise function, availability, reliability, survivability and inspection.
Process Hazard Analysis PHA	PHA is a systematic, rigorous method for ID and evaluating potential hazards associated with industry process- HAZOPS used to ensure SCE in place. COMAH requirement.
FARSI- frequency, availability, reliability, survivability, inspection	a comprehensive framework used to define and assess performance standards for SCE
FARSI- Frequency	how often the SCE mist be tested or inspected.
FARSI -Availability	the probability that the SCE is operational when demanded e.g 99.9% uptime
FARSI reliability	the ability of the SCE to perform correctly without failure e.g minimal rate of false alarms
FARSI survivability	the ability of the SCE to function during and after emergency conditions e.g fire resistant cabling or components
FARSI inspectability

Created by: krav

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