SIMOPS is the performance of potentially conflicting operations at the same time, in the same location. Both jobs may be done safely, but without coordination, one act could have a dangerous consequence to other.
Commissioning work in Construction areas
Production activities in Commissioning areas
Construction work in drilling areas
Hot work going on during break of containment in process area.
GAS FLAMMABILITY Easily ignited and capable of burning rapidly.
GAS EXPLOSIVITY Can explode easily if complying with necessary concentration conditions
15 Too Rich IMPORTANT! 100 5 0 Upper Explosive Limit (UEL) Lower Explosive Limit (LEL) Not enough gas (to create an explosion) % Methane (CH 4 ) IN Air Too much gas (not enough oxygen to support combustion) Explosive Range (for Methane)
GAS PREVENTION MESURES FOR FLAMMABILITY AND EXPLOSIVITY RISKS:
Restricted areas with specific rules such as:
Implementation of Work Permit system
Intrinsically Safe equipment…
Control of static electricity
GAS DENSITY BUOYANCY: A gas can be heavier or lighter than air Heavier than Air : accumulation of gas in low areas as trenches, tanks… Lighter than Air : accumulation of gas in top of vessels… or natural dispersion if no roof.
GAS DENSITY: A gas can be heavier or lighter than air Possible accumulation of gas then: GAS TEST before entering in confined space !
PRESSURE: High pressure can create an explosion GAS includes also effect of accumulated energy: rupture of confinement missiles, gas expansion... 10 20 30 bars 0
GAS PREVENTION: CONTROL AND MONITORING OF PRESSURE 10 20 30 bars 0
PRESSURE: Change in gas pressure = cold with danger of freezing or Liquid formation GAS
GAS TOXICITY/ASPHIXIA: A gas can affect your health from simple weakness to… death !!! According to : Nature of gas Concentration Exposure time
GAS TOXICITY: Other very toxic gases are associated to HYDROCARBON, as H 2 S H 2 S H 2 S A special course is dedicated to H2S
GASES CHEMICALS SMOKE GO ACROSS THE WIND TO ESCAPE WIND ESCAPE GAS ESCAPE WIND
SIMOPS safety systems specific tests and monitoring : A general actual test of the installation Safety systems such as Fire water system and Gas detection system has to be done prior to start of Simultaneous operations.
Isolation Systems : Isolation system such as isolation valves and shutdown system to be installed and identified to operate in case of any leakage