Enclosed Space Entry - Shipowners

It is advisable for personnel entering the enclosed space to be provided with a portable
oxygen analyser such as the ones manufactured by BW Technologies
(www.gasmonitors.com).
These instruments are designed to be used during an enclosed space entry to continuously
monitor the oxygen content of the atmosphere. If the oxygen level falls below a preset value,
normally 19.5%, a distinct audible, visual and vibration alarm is activated indicating that the
space should be evacuated immediately.
The monitor can be clipped onto the user’s overalls and because it operates passively no
further action is required from the user. If available, this equipment should be utilised
throughout the enclosed space entry.
The instruments should be tested and calibrated on a regular basis in accordance with
manufacturer’s instructions.
Figure 10: Two examples of oxygen / H2S meters
Enclosed space entry procedures
If the person entering the tank is using a personal monitoring device it is important that this is
not used to ascertain if the level of oxygen in the space is safe to enter. A separate
independent instrument should be used prior to entry for this purpose.
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