09.D Temporary Heating Devices.
09.D.01 Only temporary heating devices approved by the GDA can be used. Each heater should have a safety data plate permanently affixed by the manufacturer.
The plate must provide requirements or recommendations for:
- Clearances from combustible materials;
- Ventilation (minimum air requirements for fuel combustion);
- Fuel type and input pressure;
- Lighting, extinguishing, and relighting;
- Electrical power supply characteristics;
- Location, moving, and handling; and
- Name and address of the manufacturer.
- Note: If this information is not available on a data plate, it must be in writing at the job site.
09.D.02 A positive operating procedure must be established to assure the following:
- Proper placement and servicing;
- Safe clearance from combustible material;
- Close surveillance;
- Safe fuel storage and refueling;
- Proper maintenance; and
- Ventilation and determination of gaseous contamination or oxygen deficiency.
09.D.03 Heater installation and maintenance must be in accordance with the manufacturer's instructions.
09.D.04 Open-flame heating devices having exposed fuel below the flame are prohibited.
09.D.05 Heaters, when in use, must be set horizontally level, unless otherwise permitted by the manufacturer's specifications.
09.D.06 Heaters unsuitable for use on wood floors must be so marked. When such heaters are used, they must rest on suitable heat insulating material, such as concrete of at least 1 in (2.5 cm) thickness or equivalent; the insulating material must extend 2 ft (0.6 m) or more in all directions from the edges of the heater.
09.D.07 Heaters used near combustible tarpaulins, canvas, or similar coverings must be located at least 10 ft (3 m) from such coverings; coverings must be securely fastened to prevent them from igniting or upsetting the heater due to wind action.
09.D.08 Heaters must be protected against damage.
09.D.09 Installation of temporary heating devices must provide minimum clearances to combustible materials as specified in Table 9-3.
| Heater type | Sides | Rear | Chimney Connector |
|---|---|---|---|
| Room heater – circulating | 12 in (30.5 cm) | 12 in (30.5 cm) | 18 in (45.8 cm) |
| Room heater – radiant | 36 in (91.5 cm) 3 | 36 in (91.5 cm) | 18 in (45.8 cm) |
09.D.10 Fuel combustion space heating devices used in any enclosed building, room, or structure must be vented by a flue pipe to the exterior of the structure.
- Fresh air must be supplied, by natural or mechanical means, in sufficient quantities to ensure the health and safety of workers. Particular attention must be given to areas where heat and fumes may accumulate.
- When heaters are used in confined spaces, precautions must be taken to ensure proper combustion, maintenance of a safe and healthful atmosphere for workers, and limitation of temperature rise in the area. These precautions must be addressed in the confined space entry permit. > See Section 34.
- Vent pipes must be located at least 18 in (0.5 m) from flammables and combustibles. Where vent pipes pass through combustible walls or roofs, they must be properly insulated and securely fastened and supported to prevent accidental displacement or separation.
09.D.11 When a heater is placed in operation, initial and periodic checks must be made to ensure it is functioning properly.
09.D.12 Fuel combustion heater CO hazards.
- When heaters are used in enclosed or partially enclosed structures, CO must be continuously monitored. If not feasible, this must be so stated in the AHA and tests for the presence of CO must be made within 1 hour of the start of each shift and at least every 4 hours thereafter.
- CO concentrations greater than 25 ppm (TLV) of air volume at worker breathing levels must require extinguishing of the heater unless additional ventilation is provided to reduce the CO content to acceptable limits.
09.D.13 Personnel involved in fueling heaters must be trained in, and thoroughly familiar with, the manufacturer's recommended safe fueling procedures.
09.D.14 Heaters must be equipped with an approved automatic device to shut off the flow of fuel if the flame is extinguished (on liquid fuel heaters, barometric or gravity oil feed must not be considered a primary safety control).
09.D.15 Spark arresters must be provided on all smoke stacks or burning devices having forced drafts or short stacks permitting live sparks or hot materials to escape.
09.D.16 Solid fuel heaters are prohibited in buildings and on scaffolds.
Knowledge Check Choose the best answer for the question.
9-6. What is the minimum distance an actively used heater must be from combustible tarpaulins, canvas, or similar coverings?
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