Permit-Required Confined Spaces

Understanding This Standard

OSHA standard 1910.146, Permit-Required Confined Spaces, is one of the most frequently cited and critical safety standards, designed to protect employees from serious hazards associated with entering confined spaces. A confined space is defined as an area that is large enough and configured so an employee can bodily enter and perform assigned work, has limited or restricted means for entry or exit, and is not designed for continuous employee occupancy. A *permit-required* confined space (PRCS) further includes one or more of the following characteristics: contains or has a potential to contain a hazardous atmosphere; contains a material that has the potential for engulfing an entrant; has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor which slopes downward and tapers to a smaller cross-section; or contains any other recognized serious safety or health hazard.

Employers are required to identify and evaluate all confined spaces in their workplaces. If a space is a PRCS, employers must implement a comprehensive confined space program, including procedures for identifying and evaluating hazards, issuing permits, training employees, and providing necessary equipment such as ventilation, testing and monitoring instruments, retrieval systems, and personal protective equipment. Specific duties are outlined for authorized entrants, attendants, and entry supervisors. Common violations include failing to identify permit spaces, not developing or implementing a written permit space program, inadequate training, failing to test the atmosphere before entry, and not providing appropriate rescue equipment or procedures. Penalties for violations can range from the average of $962 to severe fines reaching $190,000 for egregious or willful violations, underscoring the serious nature of non-compliance and the potential for severe worker injuries or fatalities.

Frequently Asked Questions

What is the primary difference between a confined space and a permit-required confined space?

A confined space has limited entry/exit, is large enough for a worker, and isn't for continuous occupancy. A *permit-required* confined space (PRCS) has these characteristics plus one or more additional hazards, such as a hazardous atmosphere, engulfment potential, entrapment configuration, or other serious safety/health hazards.

What are the key responsibilities of an employer regarding permit-required confined spaces?

Employers must identify all PRCS, develop and implement a written PRCS program, provide training to all affected employees (entrants, attendants, supervisors), ensure appropriate atmospheric testing and monitoring, provide necessary safety equipment (e.g., ventilation, retrieval systems, PPE), and establish emergency rescue procedures.

What are the most common violations cited under OSHA 1910.146?

Frequent violations include failure to develop and implement a PRCS program, inadequate or no atmospheric testing before entry, insufficient training for employees, lack of appropriate rescue equipment, and not having an attendant present during entry operations.