Physical condition (meet the following three requirements at the same time)
A) There is enough space for employees to enter and carry out the designated work;
B) Access and evacuation are restricted, and it is impossible to access freely;
C) It is not designed for employees to work in the office for a long time.
Hazard characteristics (satisfying any one or more)
A) Toxic and harmful gases exist or may be generated;
B) There are or may be materials to bury the contestants;
C) The internal structure may trap the entrant (such as the internal fixing device or the walls are inclined inward);
D) There are identified health and safety risks.
Extended data:
The terms involved in confined space operation mainly include: confined space, confined space operation, isolated gas mask, air respirator, lifeline and gas detector.
Confined space: all kinds of towers, kettles, tanks, furnaces, pipelines, containers, basements, tunnels, sewers or other closed or semi-closed places.
Confined space operation: according to the definition of the industry standard Hg 30011-2013, enter the confined space operation in the production area.
Gas mask: it is a personal personal protective equipment, and it is also a personal protective equipment. Wear it on the head to protect the respiratory organs, eyes and face, and prevent the harm of toxic substances such as toxic gas, dust, bacteria, toxic and harmful gas or steam.
When working in confined space, poisoning accidents and explosion accidents are easy to occur if proper protective measures and on-site inspections are not done, resulting in casualties.
Poisoning accidents mainly occurred in sewage wells, fermenters, pressure vessels, sewers and basements.
The unsafe behaviors of people in confined space operations mainly include: first, the workers did not detect the gas in the workplace; Not wearing a gas mask; Not wearing a respirator; Not aware of the existence of danger;
The main problems existing in confined space operation management are: unqualified personal protective equipment is not provided; Supervision and management is not in place or turn a blind eye to the hazards; Education and training (safety disclosure) is not implemented, in-depth or effective; The danger at the scene is not clear.
References:
Baidu encyclopedia-limited space operation