Assess the complete robot-and-furnace application, not just the robot arm. Document the tasks and operating states, identify where people may be exposed to heat or unexpected motion, evaluate ignition and explosion conditions, then implement and verify controls for production, faults, setup, and maintenance. There is no universal safe placement distance or temperature threshold established for every furnace-robot application.
What the assessment needs to cover
A furnace-side robot application can combine hazards from the robot, its end-effector and payload, the furnace and fuel system, and the surrounding work area. A robot carrying a hot or molten load may create a different exposure from one handling cooler material; furnace startup, shutdown, and abnormal process conditions may also change the hazard picture.
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OSHA’s robot technical manual identifies environmental heat, hot surfaces, dust, and sparks among hazards to consider. It recommends a documented risk assessment before commissioning, with affected workers involved. Its guidance is general: it does not set a safe robot-to-furnace distance, certify equipment for a particular thermal environment, or replace an application-specific assessment.
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Build a task- and lifecycle-based assessment
Start with the actual application and people who interact with it. Include normal production and foreseeable non-routine work; a safeguard that works during an automatic cycle may not adequately protect someone recovering a fault or maintaining equipment.
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- Describe the application. Record the furnace type and operating states, robot and end-effector, payload (including hot or molten material), work envelope, cycle, and relevant process materials.
- List tasks and lifecycle stages. Include installation, commissioning, production, setup, fault recovery, cleaning, and maintenance. Consider foreseeable abnormal events as well as normal operation.
- Map who can be exposed and where. Include operators, maintenance staff, contractors, visitors, and emergency responders. Mark the robot envelope and furnace hazard areas, entry points, and paths to the work location.
- Describe each exposure and its circumstances. Consider radiant heat, hot air, contact with hot surfaces, splashes or spills, sparks, robot motion, unexpected restart, and access while controls are being adjusted.
- Record hazards, exposures, likelihood, and risk-reduction measures. Involve workers who know the tasks, including setup and recovery work, and document how selected safeguards address the identified hazards.
A documented assessment should account for the relationship between the robot and the furnace-side process. A robot stop or access event, for example, may coincide with a hot load or an operating furnace; assess the combined situation rather than treating each item as an isolated hazard.
Assess heat exposure to people separately from equipment limits
Worker heat exposure depends on more than the air temperature. OSHA advises considering temperature, humidity, air movement, radiant heat, clothing, and workload. Assess conditions at the actual work location and account for differences between locations and operating states.
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OSHA’s Technical Manual, Section III, Chapter 4, states: “A WBGT meter is the most accurate tool for adjusting the temperature for heat stress factors including humidity, air movement (i.e., wind), radiant heat, and temperature.” A WBGT heat-stress meter can help assess conditions for workers; verify that any instrument is suitable for its operating environment. WBGT measurement does not establish a robot’s thermal rating, component protection, or fire resistance. Those equipment questions require application-specific confirmation.
Check ignition, fire, and explosion scenarios
Identify materials and conditions that could support a fire or explosion, including combustible dust, flammable gases or liquids, fuel-train conditions, furnace startup and shutdown, hot work, sparks, and combustible deposits. Consider whether robot electrical, hydraulic, or pneumatic equipment is appropriate for the actual environment, and what could happen if process controls fail.
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OSHA’s combustible-dust program addresses deflagration, other fire, and explosion hazards at facilities that handle combustible dust. The scale of the broader industrial hazard is context, not a site-specific probability: OSHA reported in 2007, citing a CSB combustible-dust hazard study, nearly 280 industrial dust fires and explosions in the United States over the preceding 25 years, resulting in 119 fatalities and more than 700 injuries. Those figures are not a furnace-robot incident rate.
A separate example shows why access and restart deserve explicit attention. OSHA’s record of the 1996 Willard Foundry incident describes a worker killed after a robotic hot-metal pourer restarted while the worker was within the machine envelope; the ladle contained molten aluminum. This single incident illustrates a severe scenario, not how frequently it occurs.
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Select safeguards for normal operation and foreseeable interventions
Choose a combination of safeguards based on the assessed hazards. OSHA identifies radiant-heat shields and hot-surface insulation as heat controls. Robot safeguarding should address access and unexpected motion or restart, while furnace and process protections should be reviewed by competent personnel familiar with the application. Administrative measures and personal protective equipment may supplement engineering safeguards where appropriate; they should not be treated as a substitute for evaluating feasible safeguards.
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|---|---|---|
| Robot access and motion safeguards | Entry into the robot envelope, robot motion, and unexpected restart | Protection during production, access, setup, recovery, and maintenance, including behavior after a fault or stop |
| Radiant-heat shielding or hot-surface insulation | Radiant heat exposure or contact with hot surfaces | Whether the control addresses the exposure at relevant work locations and operating states without compromising the application |
| Furnace-side process protections | Process-specific furnace and hot-material hazards | Suitability for the furnace and task, including foreseeable abnormal conditions; review by competent personnel |
| Administrative measures and PPE | Residual exposure where suitable | Whether measures are workable for the task and complement—not replace—effective engineering safeguards |
Validate each control in the states in which people might encounter the hazard: automatic operation, fault conditions, setup, recovery, and maintenance. Check that safeguards remain effective when the robot carries its actual payload and when furnace or process conditions vary. Reassess after changes to the process, layout, software, payload, or equipment.
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Check standards and legal requirements for the application
OSHA’s robot guidance discusses ANSI/RIA R15.06 and ISO 10218 as consensus safety guidance; OSHA states that consensus standards are not themselves OSHA regulations. Verify which legal requirements and standard editions apply in the facility’s jurisdiction.
ISO lists ISO 10218-1:2025, published in February 2025, for safety requirements of industrial robots as machines, and says system integration and robot application requirements are in ISO 10218-2:2025. Part 1 excludes some conditions, including handling loads whose nature can lead to dangerous situations; molten metals are given as an example. A molten-metal application therefore needs careful review of the relevant integration standard, other process standards, and applicable regulations. Part 1 alone should not be assumed to resolve the application’s requirements.
Neither general OSHA robot guidance nor worker heat-stress guidance establishes a universal furnace clearance, robot thermal limit, or protective-device performance for a particular site. Those decisions depend on the specific task, equipment, process, and jurisdiction.
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