Combustion Catalog | Fives North American

Sheet 4200-1 page 2


Pre-fired dryout is the process by which all mechanical and chemical water is removed from the refractory, allowing the material to reach its maximum strength. Burners and reaction chambers which have been pre-fired may be stored in areas where temperatures are below freezing. It is safe to store equipment in this condition for several years. The Initial Firing Schedule on pages 3 and 4 describes the Pre-fire dryout process. If a pre-fired chamber is accidently exposed to rain, snow or other significant amounts of moisture, the chamber must undergo the ramps and holds at 300°F and 500°F as described in the Initial Firing process.



Reaction chambers can be supplied either as one piece or as two piece assemblies including forward and rear sections. For installation of one piece reaction chambers, proceed to step 8 after unpacking. 1. Remove debris and any packing material that is not required for storage. Air and gas inlets should remain covered until interconnect piping is installed to prevent foreign material from entering the burner. Hardware and gasket materials may be found inside the burner combustion air inlet for assemblies that were not assembled prior to shipment. Compare materi- als found to parts identified on the assembly drawings to ensure you have all required parts.

2. Inspect mating flanges and other mounting areas on burner and reaction chamber interface sections.

3. If your assembly includes a two piece reaction chamber, move the Forward Reaction Chamber (outlet) section to a cradle or other suitable assembly fixture using appropriate lifting methods. For vertical assembly, the section can be positioned outlet down on a smooth, dry and level surface. The outlet should be protected from dirt and moisture. Often a yellow “x” is painted at what will be the 12:00 location (as installed) on both chamber sections and the burner body to indicate the designed alignment. 4. Install seal ring, rope gasket, drop warp or bolt hole tape at locations specified on the reaction chamber assembly drawing. Be sure the sealing or insulating material is installed in such a manner as to prevent a leak path for hot gases. If sealing ring (fiber) gaskets are supplied in sections, pre-fit the sections by laying pieces end to end prior to adhering to the refractory. The sections should be the same width and form a complete circle. Refer to the assembly drawing sec- tion view to determine the correct surface for the gasket. Measure the outside and inside diameters and compare to what is listed on the assembly drawing. Trimming of the fiber will not be not be required. Tape may be used to hold pieces together while locating the ring concentrically to refractory diameter. Spray adhesive or a small bead of high temperature RTV should be used to adhere the fiber to the refractory or flange face. If Gortex tape is supplied, tape should be applied to a clean flange surface at a smaller diameter than the bolts in an area which will be in contact with the mating flange. Overlap the ends to prevent leakage. If bolt hole tape or similar material is supplied, use adhesive to hold material such that it covers the bolt holes. Use an awl or ball-peen hammer to make openings in the material.

5. Consult appropriate assembly drawing to determine proper alignment of saddle pads, locator pins or any other attachment and support mechanisms. Look for a yellow “x” to ensure proper alignment of the sections.

6. Using appropriate lifting methods, place the rear section reaction chamber in the proper location as illustrated on the assembly drawing.

7. Apply thread lubricant to bolt or stud threads. Use washers and nuts as specified on the reaction chamber assembly drawing. Be sure the entire reaction chamber assembly is adequately supported prior to removing lifting mechanism.

8. Sealing material such as bolt hole tape, Gortex or high temperature silicone (RTV) is required between the reaction cham- ber mounting plate and customer equipment. This material as well as fasteners may not be included with the equipment. Prepare customer equipment or reaction chamber mounting flange with proper sealing material prior to lifting the reaction chamber.

9. If desired, the burner may be assembled to the reaction chamber prior to mounting the reaction chamber to customer’s equipment. This is not recommended for larger or two-piece reaction chambers.

10. Using appropriate lifting methods move and install the reaction chamber assembly in its permanent mounting location. Use thread lubricant, nuts and appropriate methodology to secure the reaction chamber.

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