BACKGROUND
The application requirement was a 2” Stainless Steel heater capable of 120 CFM with a 250⁰C outlet temperature. The inlet temperature was ambient air. The heater required two Conflat Flanges (CF2.75), which could be used in a parallel flow configuration at the customer site. The heater needed to be air tight.
SCOPE
MCF – Three Phase:
- 250⁰C @ 120CFM using (2) units in a parallel flow pattern
- Stainless steel 304, all wetted parts
- Pressure tested to 90 PSI (or equivalent 5 x 10 ¯⁴ ATM, cc/sec or better)
- 3-phase with three heated zones
- (3) independent internal type “K” thermocouples for each zone
- 11KW (± 10%) , 240 Volt, 3-phase (or 1-phase optional)
- 36” Lead wires for each zone with 12” wire braid for strain relief
- 304SS CF 2.75 inlet and outlet flange
- Medium being heated: Air, ambient
- He Leak Tested = 5 x 10¯⁴ ATM, CC/sec or better
OUTCOME
The heater was laser welded on the flanges and brazed on the heater zones. The heater helium leak test passed up to 1 x 10 ¯⁸ cc/sec in during the testing phase. There were no problems heating ambient air at 2.5CFM to 200°C during the live power test at BCE. The part was cleaned and passed the required 700 Volt DC Hi-pot test for 5 seconds @ 0.5mA.