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SECTION 6: RADIANT TUBE AND TAILPIPE
17
4. Select pump model series for total system flow
units:
EP-100: up to 66 flow units
EP-200: up to 110 flow units
EP-300: up to 224 flow units
5. See Page 14, Table 2 for altitudes greater than
2000'.
6. For each branch, add the length of radiant tube
after each heater:
Repeat this calculation for each branch in the
system.
7. Divide the total radiant tube length in the branch
by the number of burners in the branch to get
the average radiant length per burner.
Repeat this calculation for each branch in the
system.
8. Using the average radiant length per burner
(Calculated in Step 7) See Page 17, Table 4 to
select the allowable tailpipe lengths per flow
unit.
Table 4: Allowable Tailpipe Lengths
*Minimum tailpipe lengths can only be used if radiant tube length is recommended or greater.
Burner
Radiant Tube Length
After Each Burner
1+
2+
3+
4+
5+
6+
Total Radiant Tube
Length in Branch =
Average Radiant
Length Per Burner =
Burner Model
B-2 B-4 B-6 B-8 B-9 B-10 B-12/B-12A
Radiant Tube Length (average distance between burners)
Minimum (ft) 10 12.5 20 20 20 30 35
Recommended (ft) 15 20 25 30 30 40 50
Maximum (ft) 20 25 35 45 50 60 70
Tailpipe length per flow unit
Minimum (ft)* 1.2 1.2 1.2 1.2 1.2 1.2 1.2
Recommended (ft) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Maximum (ft) 2.5 2.5 2.5 2.5 2.5 2.5 2.5
Maximum (ft) for EP-100 only 1.7 1.7 1.7 1.7 1.7 1.7 1.7