What is an entry permit?
An entry permit is a document used to verify and authorize a specific intervention in a confined space. It identifies the enclosure, the task, the people involved, and the conditions under which the intervention can be carried out. Its purpose is to ensure that the necessary measures have been prepared and verified before exposing anyone to the space.
It is a specific application of the work permit. It does not replace the assessment nor does it make a place safe simply because a signature exists. It must be based on the defined procedure for that space, its risks, and the planned activity, including hazards introduced by tools, products, or simultaneous work.
Scope and risks to consider
Preparation must identify the space and its connections, access points, equipment, and substances. In addition to atmospheric hazards, there may be risks of entrapment, flooding, falls, burial, electrical hazards, or movement of objects. The confined space analysis must consider all of these factors, even if a detector indicates acceptable values.
It’s essential to define precisely what work is being authorized. A visual inspection and cleaning with products can create very different conditions. If the task changes, maintaining the initial permit is insufficient; the preventive measures and authorization must be reviewed. The same applies if another operation modifies the isolation, ventilation, or connections of the enclosure.
Pre-authorization checks
The procedure must specify energy isolation and material entry, cleaning or conditioning where appropriate, ventilation, and atmospheric testing. Necessary equipment and communication systems must be verified. Atmospheric measurement requires appropriate instruments and competent personnel, with defined acceptance criteria for the hazards present.
The permit must include useful evidence of these checks, not boxes checked out of habit. If a measure cannot be applied or a condition is unknown, the work must be reviewed and the uncertainty resolved before authorization. The pressure to complete a shutdown does not allow for transforming an outstanding condition into a fictitious confirmation.
Responsibilities and standby monitoring
It must be clear who authorizes access, who enters, who monitors from outside, and how any changes are communicated. These roles require competence and genuine availability. Standby monitoring must be maintained according to procedure, with the capacity to raise the alarm and activate the response without abandoning its assigned duties to perform incompatible tasks.
When several companies are involved, coordination must ensure that everyone is aware of the scope of the permit and any potential interference. The presence of preventive resources will be determined according to the applicable framework; in Spain, work in confined spaces is covered under the Regulation of Prevention Services.
Validity, suspension and changes
The authorization must be limited to the authorized work and period, and should not automatically extend to new tasks or shifts. The procedure must specify what changes require suspension, evacuation, or the issuance of a new authorization. These may include alarms, loss of ventilation, disruption of isolation, or interruption of communications.
After a suspension, it is not appropriate to resume operations simply because the problem appears to have disappeared. The conditions must be rechecked and the corresponding authorization process followed. The absence of odor or a single favorable reading does not prove that the premises maintain all the necessary conditions for re-entry.
Practical example
A company authorizes an inspection of the interior of a tank after isolating it and checking its atmosphere. During the inspection, they propose using a cleaning product that was not part of the initial work. This change could introduce fumes, incompatibilities, and additional protective measures.
The correct course of action is to suspend the expansion and review the risks, procedures, and conditions before authorizing it. The original permit does not cover all activities within the depot. The example illustrates why tasks and changes must be recorded, along with the time and signature upon entry.
Emergency and permit closure
Before entering, a viable emergency response must be in place, with resources and personnel prepared for the anticipated scenarios. The emergency plan must prevent an outsider from impulsively entering to rescue without protection or authorization, thereby creating a second victim. Communication with external assistance must be prepared.
Upon closing, it is confirmed that all personnel have left, and the removal of equipment and the return of the facility are verified. The restoration of power and connections must follow a safe and authorized sequence. Any incidents observed must be documented to review the procedure before future entries. Clear identification of the facility must prevent confusion with similar storage areas or access points. The permit, isolation and lockout arrangements, and actual work must refer to the same equipment, with an on-site verification before entry begins.
Common mistakes
Common mistakes include reusing a previous permit, taking measurements only once without assessing changes, overlooking non-atmospheric risks, or allowing the confined-space attendant to be absent. Another mistake is confusing an administrative signature with the actual verification of each condition.
The preventive approach is that the authorization should reflect the actual situation and remain linked to it. Foreign models can provide technical structure, but their legal requirements and deadlines are not automatically transferable. Each organization must implement a competent procedure, tailored to its specific context, activities, and regulations.
