ELSA Escape Sets: 10 vs 15 Minutes
An ELSA (Emergency Life Support Apparatus) is a compact escape breathing set that gives a worker a fixed supply of clean air to get out of a space if the atmosphere fails. The 10-minute and 15-minute versions differ only in how long that supply lasts. Choose the duration from your escape time: the longer the route out, the longer the set you need, with a safety margin built in.
An escape set is the difference between walking out and being a casualty. Choosing 10 versus 15 minutes is a straightforward risk-assessment decision. Here is how to make it.
What is an ELSA and what is it for?
An ELSA is escape-only apparatus: a small cylinder and hood or mask giving a defined period of breathable air so the wearer can self-rescue from a dangerous atmosphere. It is not working apparatus; you do not do a task on it. Its single purpose is to get you out alive when monitoring or conditions tell you to leave now.
10 minutes or 15: how do you choose?
The figure is escape duration, so base it on how long it realistically takes to get out, then add margin for stress, restricted movement and the unexpected:
| Escape situation | Typical choice |
|---|---|
| Short, simple route to fresh air | 10-minute set |
| Longer route, ladders, bends, deeper chamber | 15-minute set |
| Any doubt about escape time | Step up to the longer set |
People move slower under stress and in breathing apparatus than they expect. If your assessed escape time is anywhere near the limit of a 10-minute set, choose 15. Air is not the place to economise.
Constant flow versus demand
Many escape sets use a constant-flow hood: pull the toggle and air flows steadily, with no mask seal or technique to get right, which suits panic conditions and untrained-in-the-moment escape. The hood design also accommodates beards and glasses, unlike a tight mask seal. Simplicity matters when seconds count.
Looking after escape sets
- Check the cylinder pressure gauge is in the green before every shift.
- Inspect the hood, seals and harness for damage.
- Keep sets within their service and test schedule.
- Make sure every entrant is trained to don and use the set quickly.
The takeaway
Pick the duration from your assessed escape time and round up when in doubt. An ELSA only works if it is in date, checked and the wearer knows how to use it. See how escape fits the full system in the confined space entry guide, pair it with monitoring from the 4-gas monitor guide, and browse confined space safety equipment.