Process SAFETY training 2 Flashcards
Hoe lyk die generiese hazard event?
Initiating cause
Hazardous event
Consequences
Waarvoor staan ERPG?
In terme van die toxic dose, enigiets bo watter waarde is n probleem?
Emergency response planning guidelines
3
Types of fires
Pool
Jet
Flash
Fireball
Dust
Pyrophoric
BLEVE
Boiling liquid expanding vapour explosion
VCE
Vapour cloud explosion
Behalwe phosphor, wat brand ook in lug?
FeS2
As hulle modelling doen vir thermal radiation, wat is die threshold
9.5kW/m2
Twee tipes explosions?
Deflagration - stadiger as die spoed van klank - black powder
Detonation - vinniger - nitroglycerine
Dust explosion se twee addisionele vereistes
Dispersion en confinement
Tanks moet altyd volgenaak word?
Van onder af. Risiko is static
Dangerous level of over pressure for humans
140mbar
Die twee grense waarbinne iets sal begin brand, of ontplof
LEL (lower explosion limit)
UEL (upper explosion limit)
Flashpoint
Basies maar waar n liquid begin dampe vorm, en waar daar dan n situasie ontstaan waar dit kan ontplof
AIT
Auto ignition temperature
MIE
Minimum ignition energy
Stoichiometries, lokale minimum vir spark energie, soos jy na die limits beweeg het jy meer energie nodig
Hazardous zoning
0 - gevaarlikste, heeltyd n kans vir ontploffing
1 - explosive atmosphere likely to occur
2 - unlikely, maar kan gebeur
Posisionering van kompressors
So ver as moontlik weg van n atmosfeer waar ons n explosive limit mag betree. Kompressor suig die lug in…
Wanneer raak iets n static accumulator?
Co ductivity less than 50pS/m
Hoe werk die equipment grading vir die verskillende zoning
Zone +1
Dws vir n zoning van 0, het jy toerusting nodig van kategorie 1. Vir dust, sit ons net n 2 by So n zone 1, is n dust zone 21
Mense kan nie n suurstof persentasie hanteer laer as?
10%
Hoe lyk die stappe om te commission van concept af en wanneer kan ons die grootste impak he op safety?
Process definition
Peocess design
Detailed design
Fabrication and construction
Commission
GROOTSTE impak aan die begin
ESSA
Emergency systems survivability assessment
Belangrik- 4 beginsels van inherent safety
Minimise
Substitute
Moderate
Simplify
SIS
Safety instrumented systems
Basies maar jou trip systems
Die standaard vir SIS
IEC 61511
SIL
Safety integrity level
Relative level of risk reduction provided by a SIS
SIL se basiese insette
Fd - frequency of initaiting event
Independent protective systems with their probability of failure
Criteria - wat die tolerable frequency is
Voordele van LOPA analysis
Highlights the required system integrity at an early stage of the project
Provides a clearly structured justification for the chose integrity level
LOPA disadvantages
Subjective
Does not consider common cause failures
SIL2, wat beteken dit?
Range is 10^(-2) tot -3 - probability of failure
Wat is n ander belangrike aspek van SIL
Die proof test interval. Sisteme moet getoets word, daar word n bepaling gedoen van hoe gereeld
Met SIL , wat is die verskil tussen redundancy en diversity
Redundancy - twee inafhanklike vloei netwr as n voorbeeld
Diversity - probeer dieselfde meet, op n heeltemal ander manier
QRA
Quantified risk assessment
Akroniem vir die levels van risk reduction
ERICPD
Eliminate, reduce, isolate, control, protect, discipline
ALARP
As low as reasonably practicable
Baie belangrik, rate of incidents (ALARP)
1E-3/jaar = intolerable (bo dit)
1E-4/jaar = tolerable if alarp (publiek)
1E-6/jaar = broadly acceptable vir almal
In terme van die ALARP ranges waar sal jy watter RA gebruik
Qualitative laagste risiko
ALARP - semi quantitative
Intolerable - quantitative
RAM
Risk assessment matrix
IR and AR
Individual risk and Aggregate risk
Environmental accident pathway
Source - pathway - receptors
Operating envelopes
Opearting - alarm - trip - limit of mechanical integrity
PSSR
Pre start safety review
3 important things for barrier health
Asset integrity:
Design integrity
Operations integrity
Technical integrity
SECE
Safety and Environmental critical element
What do you eed for each SECE
IMT programme
Inspection Maintenance and Testing programme
ORA
Operarional risk assessment
3 tipes maintenance
Predictive
Preventative
Breakdown
RBI
Risk based inspection
RBI methods
Qualitative
Semi quantitative
Quantitative