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SER & EGR Tube Accessories

Flanges and End Plugs are commonly used to configure Single-Ended Recuperative (SER) and Exhaust Gas Recirculation (EGR) radiant tube assemblies.


Notes on Flanges, End Plugs & Centering Locators (or Pins):

  1. SER Outer Tubes have both Flanges and End Plugs, while SER Inner Tubes have Flanges only.
  2. SER Inner Tubes installed horizontally typically have three (3) glued pins, 120° apart, located three inches (3”) from the tube end (opposite the flange). These pins insure the SER Inner Tube is centered inside the SER Outer Tube. The height of the pins depends on the ID of the Outer Tube used (must be determined before ordering). SER Pins are usually glued to the Inner Tube just before installation into the furnace (Note: Use the glue provided).
  3. Vertically-oriented SER Inner Tubes usually do NOT require pins for Centering Location.
  4. EGR Inner Tubes are not flanged and typically have six (6) Silicon-brazed pins, two sets of three (3) each, 120° apart, located three inches (3”) from each tube end. These pins insure the EGR Inner Tube is centered within the Outer Tube at both ends. The height of the pins depends on the ID of the Outer Tube used (must be determined before ordering). Both horizontally- and vertically-mounted EGR Inner Tubes require these Centering Locator pins. 
  5. EGR Inner Tubes are paired with an End Locator insuring A) proper spacing of the EGR Gap with respect to the burner nozzle, and B) sufficient length for the combustion gases to make the turn into the Outer Tube (typically 2” to 4” depending on the burner requirements).

Friday, May 10, 2013(2 items)

INEX Standard Flange Sizes

Tube Size (Nominal OD)

 U.S. (inches)

Metric (mm)

Flange O.D.  Thickness   Flange O.D Thickness 
2-3/8" (60 mm) 3-1/2 0.700  88.9 17.8
2-3/4" (70 mm) 3-3/4 0.700  95.3
3-1/4" (83 mm)  4-3/8 0.700  111.1 17.8
3-3/4" (95 mm) 4-7/8 0.700 123.8 17.8
4-1/2" (114 mm)  5-1/2 
0.700 139.7 17.8
5-1/8" (130 mm)  6-1/4 0.700  158.8 17.8
 6" (152 mm) 7- 1/4
0.800  184.2 20.3
Note: Please call to discuss dimensional
capability for critical applications