Requirements of flame retardant clothing for welding operation in steel plant
In the scenarios of steel mill and welding operation, flame retardant clothing (fr work clothes) is a compulsory protective equipment related to life safety. The following is the analysis of professional needs in these two fields:
Foreman: splash of molten steel (above 1600 ℃), heat radiation at furnace mouth (>1000 ℃), prevention of molten metal penetration (EN ISO 11611 standard)
Caster: molten steel splashing and mold overflow during ladle tipping pouring, anti molten metal penetration (EN ISO 11611 standard)
Continuous casting operator: high temperature billet cutting spark, equipment breakout, anti spark ignition+high temperature steam resistance
Crane operator: accidental splashing when lifting the ladle (high risk of splashing in the air!), full body covering sealing design (one-piece suit+head cover)
Key performance of flame retardant clothing
Material: Nomex must be used ® IIIA aramid blend or flame retardant cotton+anti metal splash coating (e.g. proban ® Processing)
Certification: comply with the double standards of EN ISO 11612 (high temperature protection) and EN ISO 11611 (welding protection)
Design: with reflective strip (low visibility environment), stand collar+double-layer placket (to prevent the inflow of molten metal), no exposed pocket (to avoid slag accumulation)
⚠️ Fatal lesson: ordinary cotton clothes will instantly burn and adhere to the skin when encountering molten metal, resulting in deep burns! Flame retardant clothing is carbonized to form a thermal insulation layer for escape time.
2, Welding operation: double threat of spark and arc
Welding type and risk level
Electric arc welding: the spatter spark temperature reaches 2800 ℃, and the probability of igniting clothes is very high, EN ISO 11611 class 1;
Gas welding/cutting: open flame+molten metal dripping (such as oxyacetylene cutting), EN ISO 11611 class 2 (higher protection);
Plasma cutting: ultra high temperature plasma flame (16000 ℃) sputtering range is wide, class 2+fire apron;
Protection enhancement points
Anti sparking design: the fabric needs to pass the ISO 9150 anti molten metal dripping test (dripping aluminum/molten steel does not penetrate)
Anti static function: avoid welding sparks detonating dust environment (such as steel plant maintenance area), which shall comply with en 1149 standard
Key accessories:
Leather jacket: covering shoulder/forearm (resistance to direct spark impact)
Balaclava: protect the neck and ears (welding sparks are easy to splash into the collar)
Contraindications for use
It is strictly prohibited to wear ordinary clothes outside fr clothes (nylon jacket will melt in case of sparks)
Do not repair by yourself: the damaged part should be handled by a professional flame retardant clothing manufacturer, otherwise the protection will be lost
Periodic inspection: thermal protection performance test (TPP ≥ 15 cal/cm ²) and arc protection value (ATPV ≥ 8 cal/cm ²) shall be conducted every 6 months
��️ Ultimate protection scheme (steel making+welding cross scene)
For positions exposed to molten steel splash+welding sparks at the same time (such as steel plant equipment maintenance welder), the "sandwich protection method" shall be adopted:
Bottom layer: flame retardant sweat absorbing underwear (Nomex ® Fiber)
Middle layer: fireproof and thermal insulation clothing (aluminum foil coating reflects radiant heat)
Outer layer: Class 2 welding flame retardant clothing (anti spark+molten metal)
�� Data warning: according to the statistics of the U.S. Bureau of Labor Statistics (BLS), the burn mortality of welders who did not wear qualified fr clothing increased by 3.8 times. In steel plants, flame retardant clothing can reduce the burn area by 50% (confirmed by NFPA Research).