FLOW RATES
MODEL
PIPE SIZE
206/207
1-1/4"–1-1/2" - 2"
266/267
1-1/4"–1-1/2" - 2"
336/337
1-1/4"–1-1/2" - 2"
406/407
1-1/4"–1-1/2" - 2"
POLYMER HEADERS
HEAT EXCHANGER PRESSURE DROP TABLES
POLYMER HEADER (STANDARD MODELS)
PLASTIC INTERNAL BAFFLE
(Manufactured after 11/08)
PRESSURE DROP (FT OF HEAD)
FLOW
GPM
206/207
266/267
20
4.0
25
4.0
30
4.0
35
4.0
40
4.6
50
4.6
60
4.6
70
4.6
80
4.6
90
6.9
100
8.1
110
10.4
120
11.0
125
11.5
MIN. GPM MAX. GPM*
20
125
25
125
35
125
40
125
336/337
406/407
4.6
5.2
5.8
5.2
5.8
5.2
5.2
6.3
6.9
6.9
6.9
6.9
6.9
8.1
9.2
9.2
9.2
9.8
9.8
10.4
10.4
10.4
11.0
12.1
12.1
11.5
13.3
13.3
12.7
17.9
17.9
13.8
20.2
20.2
*When flow rates exceed maximum GPM an external auxil-
iary bypass valve is required. See external bypass valve
section for details.
CAST IRON HEADERS (ASME)
CAST IRON HEADER (ASME MODELS)
PRESSURE DROP (FT OF HEAD)
FLOW
GPM
206/207
20
1.8
30
2.2
40
2.5
50
2.7
60
3.3
70
4.3
80
5.5
90
6.8
100
8.2
21
266/267
336/337
406/407
8.0
9.0
9.0
9.8
9.8
10.5
10.5
11.0
11.0
11.5
11.5
14.0
14.0
17.0
17.0
9.0
9.8
10.5
11.0
11.5
14.0
17.0