Enclosed Space Entry

Question 1

How does COSWP define an enclosed space?

Answer 1

A space not designed for continuous worker occupancy

and has either or both of the following characteristics

• Limited openings for entry and exit
• Inadequate ventilation

Question 2

Does an enclosed space need to be enclosed on all sides?

Answer 2

No, a ships hold may have open tops but due to the nature of the cargo at atmosphere inside the hold is hazardous

Question 3

After an enclosed space is opened could the adjacent spaces be considered an enclosed space?

Answer 3

• Yes, the adjacent space could become unsafe. Especially if a crew member has collapsed inside the enclosed space. The adjacent space should be evacuated and tested.

Question 4

How would you prepare for an enclosed space entry?

Answer 4

Plan
- Discuss in weekly management meeting.
- Outline work required.
- Resources required from each department.

Carry out RA
- By competent officer
- Use job specific RA in SMS and identify the risks.
- Consideration should be given to the work involved and how this could affect the atmosphere.

Permit to Work
- Created to mitigate the risks from the RA. - A copy kept at the tank entry point and on the Bridge, included is;

• Location
• Purpose of entry
• Time of entry and exit
• Enclosed Space has been properly ventilated we validate this by testing the atmospheric conditions
• Atmospheric conditions (taken at regular intervals)
• Safety equipment at entry; rescue tripod, BA cylinders with umbilical cords, BA board, EEBD’s
• Tank sentry in comms with Bridge (should inform of entry and exit times) and entry team
• PPE worn
• Isolations in place
• PTW briefed to all entrants and signed by all entrants, responsible officer and the authorising officer
• Emergency procedures in place
• Adequate lighting

PTW should not be closed until the tank lid has been confirmed secured

Question 5

What gases are you testing for on the gas meter?

Answer 5

• Oxygen level
• Flammable gases / vapours
• Hydrogen Sulphide
• Carbon Monoxide

Question 6

What are the required gas readings for enclosed space entry?

Answer 6

• Oxygen must be at least 20.8%
• Flammable gases/vapours must be NIL
• Toxic gases must be <50% of the Workspace Exposure Limit (WEL)

Question 7

What are LEL and LFL? How are they managed for enclosed space entry?

Answer 7

• LEL = Lower Explosion Limit
• LFL = Lower Flammable Limit
• Limits will be defined by authorising officer which will be in line with the SMS