HK Confined Space Competent Person Test flashcards
HK Confined Space Competent Person Test · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Confined space definition
- A place that is enclosed or partly enclosed, has limited entry or exit, and is not designed for continuous human occupancy.
- Oxygen deficiency level
- An atmosphere containing less than 19.5% oxygen by volume; normal air is about 20.9% and entry should not proceed below this level.
- Oxygen enrichment level
- An atmosphere containing more than 23.5% oxygen by volume, which increases fire risk and makes clothing and materials burn fiercely.
- Lower explosive limit (LEL)
- The minimum concentration of a flammable gas or vapour in air that will ignite; entry is normally prohibited above 10% of the LEL.
- Hydrogen sulphide hazard
- A toxic and flammable gas heavier than air that accumulates in sewers and pits; it deadens the sense of smell at higher concentrations.
- Carbon monoxide hazard
- A colourless, odourless gas produced by incomplete combustion that binds to haemoglobin and can cause unconsciousness and death.
- Bump test
- A check that a gas detector responds correctly to a known concentration of gas; it is carried out before use to confirm the instrument is working.
- Calibration of gas detector
- Adjusting an instrument's response against a known standard gas concentration so that readings are accurate; it is done at intervals specified by the manufacturer.
- Sampling strategy
- Testing at the top, middle and bottom of a space before entry and continuously during occupancy, because gases vary in density and may stratify.
- Action level for flammable gas
- A reading of 10% of the LEL at which work must stop, the space must be evacuated and the cause investigated before re-entry.
- Permit-to-work
- A formal written authorisation specifying the space, work, hazards, precautions, authorised persons, validity period and rescue arrangements for a confined space entry.
- Lockout/tagout
- A procedure in which each worker applies a personal lock and tag to an energy isolation point and retains the key to prevent unexpected energisation.
- Purging and ventilation
- Removing or diluting hazardous atmospheres by supplying clean air; ventilation must not recirculate contaminated air and does not replace atmospheric testing.
- Isolation of confined space
- Physically disconnecting and locking out all energy sources and blanking pipes or ducts that could introduce hazardous material into the space.
- Engulfment hazard
- A hazard in which a person is trapped and suffocated by free-flowing solids or liquids, such as grain, sand, cement or water in a tank.
- Fall hazard at entry
- The risk of falling at the entry point or inside a space; controlled by guardrails, covers, safe access and fall-arrest systems.
- Electrical hazard in wet spaces
- The risk of electric shock from portable tools and lighting in damp spaces; equipment should be suitably rated and protected by residual current devices.
- Heat stress in confined spaces
- A hazard from high temperature, humidity and work rate; the assessment should consider cooling, rest breaks and hydration for entrants.
- Competent person duties
- The person who carries out the risk assessment, issues and cancels the certificate, and confirms that safety precautions are in place before entry.
- Standby person duties
- A person who remains outside the space at all times, maintains communication and a log of entrants, and initiates rescue without entering the space.
- Authorised person (entrant)
- A person permitted to enter the space who must follow the permit conditions, use specified equipment and report any change in conditions.
- Entry supervisor role
- The person who coordinates the work, confirms the permit is valid, checks isolation and atmosphere, and ensures the standby person is in place.
- Contractor coordination
- The exchange of information between host and contractor on hazards, isolation, permits and emergency arrangements, with agreed responsibility for each control measure.
- Non-entry rescue
- Rescue using a tripod, winch and harness from outside the space, with the entrant attached to a retrieval line before entry so rescuers need not enter.
- Breathing apparatus for rescue
- Self-contained or supplied-air breathing apparatus used for entry where the atmosphere is or may be immediately dangerous to life or health.
- Rescue plan
- A documented plan covering self-rescue, non-entry rescue and entry rescue, communicated to all involved and reviewed after any incident or change.
- Communication during entry
- Agreed signals or radio contact between entrant, standby person and rescue team, tested before entry and maintained throughout the work.
- First aid arrangements
- Trained first aiders, a first aid kit and, where required, oxygen resuscitation equipment and an automated external defibrillator available for emergencies.
- Risk assessment for entry
- An assessment identifying all atmospheric and physical hazards, evaluating likelihood and severity, and specifying control measures, reviewed before each entry.
- No-entry space
- A confined space where the risk assessment shows entry is not necessary; work should be done from outside where practicable.
- Certificate for confined space entry
- A document issued by the competent person specifying the period of validity, safety precautions and procedures; work must cease if conditions are not met.
- Statutory duties under Cap. 59AE
- The proprietor or contractor must ensure compliance with the Confined Spaces Regulation, including assessment, certification, training, supervision and standby arrangements.