No Hot Work Sign

No Hot Work Sign

A no hot work sign is the ISO 7010 prohibition pictogram that forbids welding, cutting, grinding and any other spark-producing activity in the marked area, typically because a flammable atmosphere, fuel storage or recently gas-freed compartment nearby has not been cleared for such work. On board a vessel, hot work carried out without proper gas testing and a valid permit is one of the leading causes of catastrophic shipboard fires, so a clearly displayed no hot work sign gives contractors, crew and visiting surveyors an immediate visual instruction that overrides any assumption the area might otherwise be considered safe to work in that day.

The pictogram shows a stylised welding torch and flame symbol struck through with a diagonal red bar on a white circular background, following the same internationally recognised ISO 7010 graphical convention used throughout the shipping industry and Australian workplaces. Because a no hot work sign relies on imagery rather than language, multinational crews and shore-based contractors recognise the restriction instantly, without depending on a text notice that some readers on board may not always fully understand or notice in time.

Where a no hot work sign is required

Common locations include the boundaries of fuel tanks, pump rooms, paint stores, cargo holds carrying flammable goods and any space undergoing gas-freeing or tank cleaning. A no hot work sign should remain in place until a competent person has tested the atmosphere and a formal hot-work permit has been issued, at which point it may be temporarily removed or covered for the duration of authorised work. Reinstating the no hot work sign as soon as the permit expires closes the loop and prevents unauthorised welding or cutting from resuming once supervision has ended.

Durable construction for shipboard reliability

Australian workplaces and vessels operating under AS 1319, the Australian Standard for safety signs, expect this same red-circle prohibition pictogram wherever hot-work activity needs to be controlled, so ships and shore repair facilities calling at Australian ports benefit from signage already familiar to port state control officers, terminal safety staff and permit-to-work supervisors. Safety Sign Hub supplies this pictogram in a range of standard sizes to suit a tank hatch, a pump room bulkhead or a wide cargo hold entrance, produced in either self-adhesive vinyl for smooth interior surfaces or rigid, weather-resistant polypropylene for exposed decks and tank tops. Vessel safety officers restocking permit-to-work signage ahead of a survey, or commissioning a newly delivered ship, can specify quantities and sizes at the time of ordering, and Safety Sign Hub’s Australian-based team will confirm lead times against the vessel’s dry dock schedule. Consistent signage across sister vessels in a fleet also simplifies crew and contractor familiarisation, since anyone transferring between ships operated by the same company encounters identical pictograms, materials and mounting heights at every hot-work boundary, shortening the briefing needed before a job can safely begin.

Safety Sign Hub produces every no hot work sign in rigid, fire-retardant photoluminescent material that continues to glow if lighting fails during a blackout or fire, keeping the prohibition visible when visibility is otherwise poor. The panel resists saltwater corrosion, UV exposure on open decks and the heat generated near engine spaces, so the sign stays legible for years without fading or cracking. Ship chandlers and vessel procurement teams can order confidently using IMPA code 33.8539 or ISSA code 47.585.39, and Safety Sign Hub despatches the correctly sized no hot work sign from Australian stock, ready for fitting ahead of the next scheduled maintenance period or dry dock. For further guidance on managing hot-work risk, see Safe Work Australia’s hot work resources.