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Contents
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Outline of
ADCO procedures and minimum requirements. Details of all systems and types of
equipment that may require to be isolated.
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Machinery
power supplies, electric, pneumatic, hydraulic, engine systems, prevention from
moving by gravity, release of pressure.
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Pressurised
systems, storage, process, pipe work, vessels.
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Chemical
systems, vessels, pipe works or tanks holding fluids, materials that r hot cold
flammable, toxic, corrosive. Necessity for isolation, draining purging and
decontamination
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Stored
energy systems, systems capable of containing and releasing toxic fluids, gases
or substances.
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Electrical
systems those capable of shock arcing and igniting a flammable atmosphere. HV
requirements with references to the HV certification course
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Safety and
emergency systems, Isolation, inhibition, overrides, manual control
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Physical
disconnection and blinds, removal of pipe sections and spools and blinding of
open ends.
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Spades and
blind. Pressure rated metal barriers, designs, installations.
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Vapour
barriers, non pressure rated systems, use for prevention of gravity loss of
liquids or vapours or crud barriers.
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Valve
isolations, different types of valves types of seals and degrees of positive
isolation, integrity proving, those for fluid service and maintenance. Types of
valves not considered suitable for isolations.
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Double
block and bleed Applicability, means of testing drains vents monitoring
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Double
wedge gate and parallel expanding gate valves, sales, securing proving
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Self
seating orifice plate carriers, applicability for single isolations.
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Pipe
freezing, use, agree procedures, thawing and re-instatement, hazards of liquid
nitrogen
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Stopple
bags use as non primary barriers
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Lock out /
tag out key and primary barrier systems for electrical energy and systems which
may cause a release f stored energy.
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Reduction
of risks. Risks assessment applicable to isolations, includes such criteria as
reduction of pressures access and operation of nearby plant and equipment,
controls and limits of other work, gas and fire detection systems, reduction in
vessel operating levels and through puts, back up isolation points
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Recording
of assessments, close out of recommendations, incorporation in procedures
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ADCO
procedures and standards
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Responsibilities for isolations, permits, isolation certificate, monitoring and
de-isolation and commissioning. Reference to permit-to-work courses.
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Identification of requirements, evaluation of type and level of isolations
required identification of isolation standard, i.e. vessel entry, process lines,
valve isolations
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Emergencies, loss of isolation or containment
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Tests,
monitoring, security
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Records,
certification, permits
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Overrides
and inhibits. Assessment of requirements, registration and authorisation
validation, audits
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Reinstatement, close out of documentation, engineering changes
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