Confined Space Training Certificate Risk Assessment and Safe Systems 2

Question 1

A confined space entry permit should specify a time limit because:

Accepted Answer

Conditions may change over time, PPE has limited duration, and it ensures periodic reassessment of safety

Answer

Time limits ensure that conditions are periodically reassessed, that PPE such as breathing apparatus is not used beyond its rated duration, that workers are not exposed for excessive periods, and that the permit is formally reviewed. Changed conditions may require a new permit with updated precautions.

Question 2

Isolation of services and pipework connected to a confined space is a critical part of the safe system of work. Effective isolation typically requires:

Accepted Answer

Physical disconnection, blanking, or the use of lock-out/tag-out procedures to prevent accidental introduction of substances or energy

Answer

Effective isolation must be positive and physical — relying solely on closing valves is insufficient as they can be accidentally opened or may leak. Methods include physical disconnection of pipes, insertion of blank flanges (spades), electrical lock-out/tag-out, and securing mechanical equipment. Each isolation must be verified and tested.

Question 3

A competent person for confined space work is defined by the HSE as someone who has:

Accepted Answer

Sufficient training, knowledge, experience, and skill to carry out the task safely

Answer

The HSE defines competence through a combination of training, knowledge, experience, and skill appropriate to the task. For confined space work, this includes understanding the hazards, knowing the safe system of work, being able to use equipment correctly, and recognising when conditions become unsafe.

Question 4

When reviewing a safe system of work for confined space entry, which of the following would indicate an inadequate system?

Accepted Answer

The risk assessment was last reviewed three years ago and the work process has since changed

Answer

A risk assessment that has not been reviewed despite changes in the work process is inadequate. Risk assessments must be living documents, reviewed whenever there is reason to believe they are no longer valid — such as changes in work methods, materials, equipment, or after an incident.

Question 5

Mechanical ventilation of a confined space before and during entry is used to:

Accepted Answer

Dilute and remove hazardous atmospheres and provide a supply of fresh breathable air

Answer

Mechanical ventilation serves a critical safety function: it dilutes and removes toxic or flammable gases, replenishes oxygen, and maintains a safe breathable atmosphere. The ventilation intake must draw from a clean air source, and the system must be sized appropriately for the space volume and the hazards present.

Confined Space Practice Test

Confined Space Practice Test

Confined Space Training Certificate Risk Assessment and Safe Systems 2