HK Confined Space Competent Person Test cheat sheet

The Factories and Industrial Undertakings (Confined Spaces) Regulation (Cap. 59AE) applies to confined spaces in industrial undertakings; the proprietor or contractor must ensure compliance, and the Regulation operates alongside the general duties in the Factories and Industrial Undertakings Ordinance (Cap. 59).

Regulation 5 prohibits entry into a confined space unless a risk assessment has been made by a competent person and a certificate (permit) specifying the safety precautions is issued; entry work must follow that certificate.

A competent person is defined by the Regulation as a person who has attained the age of 18, has received adequate training, and is certified by a recognized body (e.g., a course recognized by the Labour Department) for the purposes of the relevant provision.

A certificate (permit) must specify the period of validity, the safety precautions and procedures, and be issued by the competent person; work must cease and the space be evacuated if the certificate conditions are not met.

The proprietor/contractor must ensure that a sufficient number of competent persons are employed and that a standby person (attendant) remains outside the space at all times while any person is inside.

The Regulation requires the proprietor or contractor to provide information, instruction, training and supervision to persons entering or working in confined spaces, and to keep records of assessments and certificates.

Occupiers and employers also carry duties under the Occupational Safety and Health Ordinance (Cap. 509) to provide a safe working environment and safe systems of work, which apply in parallel with the confined spaces Regulation.

Failure to comply with the Regulation is an offence; penalties include fines and imprisonment, and the Labour Department may issue improvement or suspension notices under the FIU Ordinance.

A confined space is defined as any place that is enclosed or partly enclosed, has limited means of entry or exit, and is not designed for continuous human occupancy; examples include manholes, sewers, tanks, silos, pits, tunnels under construction and ducts.

Identification must consider spaces that are not obviously enclosed: trenches, excavations, floating roofs, open-topped chambers and spaces with poor natural ventilation can meet the definition.

Classification should consider the nature of the space (enclosed, partly enclosed), the potential hazards, the access/egress arrangements and whether the space is connected to a process or drainage system.

Risk assessment must identify all hazards, evaluate the likelihood and severity of harm, and specify control measures; it must be reviewed when conditions change or before each entry.

The assessment must consider atmospheric hazards (oxygen, flammable gas/vapour, toxic gas), physical hazards (engulfment, falls, electricity, moving machinery, heat, noise, drowning) and the interaction between them.

The assessment should define the entry category: whether entry is required, whether the space can be entered without breathing apparatus, and the level of rescue provision needed.

Records of the assessment should be kept and made available to persons entering the space, the standby person and the emergency services where relevant.

Where the risk assessment identifies that entry is not necessary, the space should be treated as a no-entry space and work should be done from outside where practicable.

Oxygen deficiency is defined as an atmosphere containing less than 19.5% oxygen by volume; oxygen enrichment is above 23.5%; normal air is approximately 20.9% oxygen.

Oxygen deficiency can be caused by displacement (inert gas, nitrogen, carbon dioxide), consumption (rusting, combustion, bacterial action) or poor ventilation; it can occur without warning and is not detectable by smell.

Flammable gases and vapours are characterised by the lower explosive limit (LEL) and upper explosive limit (UEL); entry should not proceed if the reading exceeds 10% of the LEL unless the atmosphere is purged and continuously monitored.

Toxic gases of concern include hydrogen sulphide (H2S), carbon monoxide (CO), sulphur dioxide (SO2), chlorine and solvent vapours; H2S is particularly dangerous because it deadens the sense of smell at higher concentrations.

Carbon monoxide binds to haemoglobin and can cause unconsciousness and death; it is produced by incomplete combustion and by some industrial processes.

Hydrogen sulphide is heavier than air and accumulates in low-lying spaces such as sewers and pits; it is both toxic and flammable.

Atmospheric hazards must be assessed before entry and continuously monitored during occupancy; readings should be recorded and compared against action levels.

Persons should not rely on the sense of smell to detect hazardous atmospheres; some toxic gases and oxygen deficiency have no odour.

Engulfment hazards include free-flowing solids (grain, sand, cement) and liquids; a person can be trapped and suffocated within seconds, and the space should be isolated from material flow before entry.

Falls are a major hazard at entry points and inside spaces; guardrails, covers, fall-arrest systems and safe access (ladders, steps) must be provided and inspected.

Electrical hazards include portable tools, lighting and equipment used in wet or damp spaces; equipment should be of the appropriate IP rating and supplied through residual current devices (RCDs).

Moving machinery inside spaces (agitators, augers, mixers) must be isolated and locked out before entry; stored energy (hydraulic, pneumatic, gravity) must be released.

Heat stress can occur in confined spaces; the assessment should consider temperature, humidity, work rate, clothing and the need for cooling, rest breaks and hydration.

Noise inside confined spaces can be amplified by reflection; hearing protection and communication arrangements should be considered in the assessment.

Drowning hazards exist in tanks, sumps and flooded excavations; isolation from water inflow and rescue arrangements for water hazards must be planned.

Other hazards include slips and trips, sharp edges, poor lighting, dust and biological hazards (e.g., in sewers); all should be identified in the risk assessment.

Gas detectors must be selected for the specific gases expected: catalytic or infrared sensors for flammable gas, electrochemical sensors for toxic gases, and paramagnetic or electrochemical sensors for oxygen.

Instruments must be calibrated and bump-tested before use; a bump test confirms response to a known concentration, while calibration establishes accuracy against a standard gas.

Sampling must be carried out before entry and continuously during occupancy; readings should be taken at the top, middle and bottom of the space because gases vary in density.

The instrument should be zeroed in clean air before use and allowed to stabilise; readings should be recorded with time, location and the name of the person taking them.

Action levels commonly used: oxygen below 19.5% or above 23.5%, flammable gas at 10% LEL as an action level, and toxic gases at the relevant occupational exposure limit (e.g., H2S at 10 ppm, CO at 25 ppm as an 8-hour TWA).

If an alarm is activated, work must stop, the space must be evacuated, and the cause must be investigated before re-entry.

Detectors must be maintained, charged and stored correctly; sensors have a limited life and must be replaced according to the manufacturer's instructions.

Where possible, remote sampling should be used before entry, and the results should be recorded on the entry permit.

Isolation means physically disconnecting and locking out all energy sources (electrical, mechanical, hydraulic, pneumatic, gravity, thermal) and blanking or disconnecting pipes and ducts that could introduce hazardous material.

Lockout/tagout procedures require each worker to apply a personal lock and tag; the key should be retained by the person who applied the lock, and the system should be tested to confirm isolation.

Purging and ventilation can be used to remove or dilute hazardous atmospheres; forced ventilation should be provided, and the air supply must be from a clean source and not recirculated.

Ventilation alone is not a substitute for testing; the atmosphere must be tested after ventilation and continuously monitored during entry.

A permit-to-work system should be used for all confined space entries; the permit should specify the space, the work, the hazards, the precautions, the persons authorised, the validity period and the rescue arrangements.

The permit should be signed by the competent person and the authorised entrant, and should be cancelled and returned when the work is completed or when conditions change.

Entry procedures should include a pre-entry briefing, a check of equipment, a communication check, and a roll call of persons entering and leaving.

Access and egress should be controlled so that only authorised persons enter, and the standby person should maintain a log of entrants and the time of entry and exit.

A rescue plan must be prepared before entry and should cover self-rescue, non-entry rescue and entry rescue; it must be communicated to all persons involved and practised where practicable.

Non-entry rescue using a tripod, winch and full-body harness is the preferred method; the entrant should be attached to the retrieval line before entry so that rescue can be carried out without entering the space.

Breathing apparatus (self-contained or supplied-air) must be available for rescue and for entry where the atmosphere is or may be immediately dangerous to life or health (IDLH).

Rescuers must be trained and equipped; untrained persons must not attempt entry rescue, as this is a common cause of multiple fatalities.

Communication between the entrant, the standby person and the rescue team must be maintained; agreed signals or radio communication should be tested before entry.

First aid arrangements should include trained first aiders, a first aid kit and, where required, oxygen resuscitation equipment and an automated external defibrillator (AED).

The emergency services should be contacted without delay in an emergency; the rescue plan should include the route and access arrangements for emergency vehicles.

Rescue equipment must be inspected and maintained, and the rescue plan should be reviewed after any incident or change in conditions.

The competent person is responsible for the risk assessment, the issue and cancellation of the certificate (permit), and for confirming that the safety precautions are in place before entry.

The authorised person (entrant) must follow the permit conditions, use the specified equipment, and report any change in conditions or any concern to the standby person.

The standby person (attendant) remains outside the space at all times, maintains communication and a log of entrants, and initiates rescue without entering the space.

The entry supervisor coordinates the work, confirms that the permit is valid, checks the isolation and atmosphere, and ensures that the standby person is in place before entry.

Contractor coordination requires the host and contractor to exchange information on hazards, isolation, permits and emergency arrangements, and to agree who is responsible for each control measure.

The competent person must be independent of the work where possible, and must have the authority to stop work if conditions are unsafe.

All persons involved should receive training and instruction appropriate to their role, and records of training should be kept.

Roles should be clearly defined in writing and communicated at the pre-entry briefing; confusion over roles is a common cause of incidents.