EEBD

What sets an EEBD apart

An emergency escape breathing device exists for one purpose only: getting a person out of a smoke-logged or contaminated space to a place of safety. It is not rated, and must never be used, for firefighting or for entering a space to work or rescue someone, which is the job of self-contained breathing apparatus with its full facepiece, demand valve and much larger cylinder. An EEBD instead uses a loose-fitting hood or a lightweight mask fed by a small cylinder, sized to give a defined minimum duration, usually stated as at least ten minutes, and it needs no fit test or trained donning drill because it has to be usable by any crew member in seconds, under smoke, without prior instruction.

Main components

Hood or mask

Most EEBDs use a clear plastic hood that seals around the neck with an elastic band, covering the whole head so the wearer keeps eye protection along with breathing air. Mask-type units cover only nose and mouth and rely on the wearer's own eye protection.

Cylinder and regulator

A small compressed air cylinder, commonly rated for around ten to fifteen minutes of use, supplies air through either a constant-flow regulator, which feeds a steady stream into the hood regardless of breathing rate, or a demand valve similar to a scaled-down SCBA system.

Harness and storage bracket

A simple shoulder or waist harness lets the wearer carry the device while moving, and each unit is stowed in a quick-release wall bracket at a fixed, marked location so it can be found in darkness or smoke.

Selection and sizing

The number and location of EEBDs on board is fixed by SOLAS, not chosen freely, but the duration rating and don time of the specific model still matter operationally:

• Rated duration, since a device good for exactly the regulatory minimum leaves no margin if the escape route is blocked
• Don time, EEBDs are expected to be put on and working within roughly one minute without assistance
• Hood versus mask type, hoods suit crew who wear glasses or have facial hair that would break a mask seal

Regulations and class

SOLAS Chapter II-2 requires EEBDs in the machinery spaces of most cargo ships, positioned so at least one is usable from a normally manned control position, plus additional units in accommodation spaces on ships carrying more than a stated number of persons. Devices must carry Marine Equipment Directive wheelmark or equivalent flag-state type approval, and cylinders are subject to periodic hydrostatic testing under the same pressure-vessel rules as other compressed gas cylinders on board.

Typical faults

• Slow cylinder pressure loss from a worn valve seat, only caught if gauges are checked on schedule rather than assumed full
• Hood elastic perishing with age or heat exposure, breaking the seal exactly when smoke is present
• Cylinder past its hydrostatic test date, taken out of service or condemned without a spare on hand
• Units stowed behind other equipment or relocated informally, so crew cannot find them under time pressure

What to look for in a supplier

• Wheelmark or flag-approved type certificate matching the exact model on order, not a family approval
• Confirmed rated duration under the applicable standard, tested at a stated breathing rate rather than a best-case figure
• Cylinder refill or exchange service compatible with the ship's trading pattern, since EEBDs are one-time-use per activation
• Spares support for hood elastics and harness webbing, the parts that actually degrade in service

An EEBD is an escape device, not a work device; the moment someone treats it as a licence to go further into a compartment to search or fight a fire, it has run out before they are back out.