Asphyxiation in farm tank (28 May 2020)

A worker suffered fatal injuries and a second worker attempting a rescue was rendered unconscious as a result of lack of oxygen, when conducting cleaning operations inside the confined space of a molasses tank at a rural property.

Molasses tank and access hole site of incident

Site of incident incident molasses tank with (390mm) access hole

Safety information

Farm work may involve accessing confined spaces including various types of tanks, silos, and pits. Common hazards associated with working in tanks are:

organic materials that ferment and result in oxygen depletion such as molasses
using petrol or diesel motors inside tanks that generate toxic carbon monoxide

Warning! If someone collapses when working inside a tank, it is important to assess the risks before attempting to rescue them. A high number of people who die in confined spaces are the rescuers. If an incident occurs get help. Do not attempt a rescue without knowing the hazards, understanding the required response and using the proper safety equipment.

When working in or around a confined space such as a molasses tank always:

consider if the work can be done another way without entering the confined space. For example, use external tank connections for cleaning or emptying the tank
have a competent person conduct and document a risk assessment that considers the hazards, how the work can be done safely and the emergency response procedure
test the atmosphere to identify if there is an oxygen deficient atmosphere or atmospheric contaminants and any flammable gas or vapour present in the space
make sure only workers with a permit enter the space and a stand-by worker is supervising the work from outside the space
put signs on or near any confined space and at each entry point to warn that only people who have been properly trained and have an entry permit can enter
make sure there is a safe means of entry and exit
establish emergency procedures and run regular practice drills with workers
provide workers and supervisors with suitable and adequate information, training and instruction to do their work safely and without risks to health. This may include training in hazard identification and risk control methods, entry permit procedures, emergency procedures and how to use respiratory protective equipment
keep records of training, risk assessments and confined space entry permits

More information

View the latest incident information releases at safework.nsw.gov.au