CITB Specialists Confined Space Operations 2

Question 1

When planning a confined space rescue for specialist operations, what type of rescue method should be considered first?

Accepted Answer

Non-entry rescue using retrieval lines and mechanical devices

Answer

Non-entry rescue methods (such as retrieval lines, harnesses, and tripod/winch systems) should always be the preferred option as they do not put rescuers at risk by entering the hazardous atmosphere. Entry rescue should only be planned when non-entry methods are not feasible due to the space configuration.

Question 2

What is the purpose of 'purging' a confined space before specialist entry?

Accepted Answer

To displace hazardous atmospheres with clean air or inert gas before entry

Answer

Purging involves displacing the existing atmosphere within a confined space with clean air (for entry) or inert gas (for hot work on vessels that contained flammable materials). This reduces the concentration of toxic or flammable gases to safe levels before workers enter.

Question 3

A specialist contractor needs to carry out hot work inside a confined space that previously contained flammable liquids. What additional precaution is essential beyond standard confined space controls?

Accepted Answer

Ensuring the space has been gas-freed, certified, and continuously monitored for flammable vapours below 1% of the LEL

Answer

Before hot work in a space that contained flammable substances, the space must be thoroughly cleaned, gas-freed, and a gas-free certificate issued. Continuous monitoring must confirm flammable vapour concentrations remain well below the lower explosive limit (LEL) — typically below 1% LEL for hot work. A fire extinguisher outside alone is insufficient.

Question 4

Which type of breathing apparatus is most appropriate for specialist work in a confined space with an immediately dangerous to life or health (IDLH) atmosphere?

Accepted Answer

Self-contained breathing apparatus (SCBA)

Answer

SCBA provides an independent, clean air supply and is the only appropriate choice for IDLH atmospheres. Filtering facepieces, cartridge respirators, and PAPRs all rely on filtering the ambient air and are therefore ineffective when the atmosphere is oxygen-deficient or contains high concentrations of contaminants.

Question 5

What training requirement applies to all specialist personnel who enter confined spaces under UK regulations?

Accepted Answer

They must hold a specific confined space entry qualification and be retrained at appropriate intervals

Answer

The Confined Spaces Regulations 1997 and the associated Approved Code of Practice require that anyone entering a confined space has received adequate training specific to the hazards they may encounter. This includes practical emergency drills and must be refreshed at appropriate intervals, typically annually or when conditions change.

CITB HS&E Specialists Practice Test

CITB HS&E Specialists Practice Test

CITB Specialists Confined Space Operations 2