Table 4: Allowable Tailpipe Lengths - Roberts Gorden CoRayVac CRV-B-2 Design Manual

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:
Radiant Tube Length
Burner
After Each Burner
1
2
3
4
5
6
Total Radiant Tube
Length in Branch =
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.
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

Radiant Tube Length (average distance between burners)
Minimum (ft)
Recommended (ft)
Maximum (ft)
Tailpipe length per flow unit
Minimum (ft)*
Recommended (ft)
Maximum (ft)
Maximum (ft) for EP-100 only
*Minimum tailpipe lengths can only be used if radiant tube length is recommended or greater.
+
+
+
+
+
+
B-2 B-4
10 12.5
15 20
20 25
1.2 1.2
1.5 1.5
2.5 2.5
1.7 1.7
SECTION 6: R
Burner Model
B-6 B-8 B-9 B-10
20 20 20
25 30 30
35 45 50
1.2 1.2 1.2
1.5 1.5 1.5
2.5 2.5 2.5
1.7 1.7 1.7
T T
ADIANT UBE AND AILPIPE
B-12/B-12A
30 35
40 50
60 70
1.2 1.2
1.5 1.5
2.5 2.5
1.7 1.7
17