‘A’ Self-Closing Semi-Watertight Fire Door Sign

‘A’ Self-Closing Semi-Watertight Fire Door Sign – IMO A.654(16) Fire Control Symbol FS0230

This ‘A’ Self-Closing Semi-Watertight Fire Door sign identifies a door built to A-class fire integrity that also provides semi-watertight closure, and that self-closes automatically to keep the boundary intact without depending on crew action. The pictogram shows the “SWT” designator above the door-and-arc symbol with a self-closing arrow, matching exactly what appears on the vessel’s fire control plan for this opening. As SKU FS0230 in the Fire Fighting Signs range, it is designed for permanent fixing on or beside semi-watertight fire doors located at main vertical zone boundaries, weather-deck accesses and other structural openings that do not require full watertight integrity but must still resist fire and limit water ingress.

A semi-watertight rating sits between an ordinary weathertight door and a fully watertight door, offering resistance to spray and moderate water ingress without the full closing and dogging arrangement of a watertight door, while still carrying the same A-class fire resistance. Because this door self-closes automatically, it maintains both its fire integrity and its semi-watertight closure every time it is used, without relying on someone remembering to shut it behind them. The photoluminescent background of this sign keeps the door’s function identifiable during a blackout, when an open boundary is hardest to notice and most consequential.

Why Self-Closing Semi-Watertight Fire Door Identification Matters

Crew moving through a vessel need to understand at a glance which doors carry fire and semi-watertight function so they never prop or wedge them open, since doing so compromises the boundary they are designed to maintain. Clear signage also helps fire parties and damage control teams quickly assess which doors along an escape route or zone boundary offer this combined protection during an incident. This distinction matters particularly where semi-watertight doors are mixed with fully watertight and standard fire doors along the same alleyway, since each type has different closing arrangements and different consequences if left open.

Compliance and Certification

This sign reproduces the fire control symbol set derived from IMO Resolution A.654(16) and continued under the current ISO 17631 standard for fire control plan graphics, matching what flag-state surveyors and classification societies expect to see identifying semi-watertight fire door function. SOLAS Chapter II-2 sets the fire integrity standard this door must meet, and correctly labelled self-closing arrangements are checked during Port State Control inspections, class surveys and internal fire door testing rounds. Fitting SKU FS0230 keeps your door signage matched to the fire control plan and self-closing test records surveyors will review.

Installation Recommendations

Fix this sign directly on or beside the door frame at eye level, using the pre-drilled fixing holes for a permanent mechanical fixing on steel doors and frames, or the self-adhesive backing where a mechanical fixing is impractical. On weather decks and exposed accesses, a screw or rivet fixing will outlast adhesive in salt spray and vibration, and the sign should remain visible in the door’s normal closed position without being obscured by hinges, dogs or hardware. Check the sign periodically alongside the self-closing mechanism during routine fire door testing rounds.

• Standard IMO/ISO 17631 fire control symbol – “SWT” designator with self-closing arrow
• Photoluminescent base for visibility during blackout or power failure
• 150x150mm rigid or self-adhesive format to suit steel door and frame surfaces
• UV-stable, corrosion-resistant construction for weather-deck and alleyway use
• Matches fire control plan symbols exactly for fast, confident door function identification

Order the FS0230 ‘A’ Self-Closing Semi-Watertight Fire Door sign to keep every semi-watertight fire boundary on your vessel correctly identified before your next drill or survey. Safety Sign Hub stocks the complete IMO fire control symbol range and ships marine-grade signage across Australia and to vessels in port.

Browse the full Fire Fighting Signs range for every fire control plan symbol your vessel needs, or see our Hazard Signs for ISO 7010 warning pictograms to complete your safety signage programme.

This self-closing semi-watertight fire door sign identifies the correct door type at a glance, helping crew and class surveyors confirm the fitting matches the vessel’s fire safety plan during drills and inspections. See our full range of fire fighting signs for complete vessel fire safety marking.