Flow Rate - Raypak 266A Installation And Operation Manual

Pipe Sizing for Gas Connection
These capacities shown below based on using SCH
40 black iron pipe. For capacities using other materials,
consult local code.
Maximum Equivalent Pipe Length (ft) (m)
Natural Gas 1000 BTU/FT
Specific Gravity @ 0.5 in WC Pressure Drop
Propane Gas 2500 BTU/FT
Specific Gravity @ 0.5 in WC Pressure Drop
3/4"
Model
NAT PRO NAT PRO NAT
25 60 90
206A
(7.6) (18.3) (27.4)
15 35 50
266/266A
(4.6) (10.7) (15.2)
10 20 30
336A
(3.0) (6.1) (9.1)
15 20
*
399/406A
(4.6) (6.1)
* A 3/4" gas line can be used for up to 5' (1.5 m) maximum length from the gas valve
in addition to the sediment trap.
Table K. Gas Pipe Sizing

Flow Rate

Model Pipe Size
1-1/4"–1-1/2"–2"
206A
266/266A 1-1/4"–1-1/2"–2"
1-1/4"–1-1/2"–2"
336A
399/406A 1-1/4"–1-1/2"–2"
* When flow rates exceed maximum GPM an external auxiliary bypass valve is
required. See external bypass valve section for details.
Table L. Min/Max Flow Rates
Figure 19. Polymer Header Water Flow
3
0.60
3
1.53
1" 1-1/4" 1-1/2"
PRO NAT
215 360
(65.5) (109.7)
125 210 480 445
(38.1) (64.0) (146.3) (135.6)
80 140 320 290
(24.4) (42.7) (97.5) (88.4)
55 95 225 215
(16.8) (29.0) (68.6) (65.5)
Max. GPM
Min. GPM (lpm)
(lpm)
20 (75) 100 (378)
25 (95) 100 (378)
35 (132) 100 (378)
40 (151) 100 (378)
PRO
Figure 20. Bronze Header (ASME) Water Flow
Flow GPM
(lpm)
480
20 (75)
(146.3)
25 (95)
30 (113)
35(132)
40 (151)
50 (189)
60 (227)
70 (265)
80 (303)
90 (340)
100 (378)
Table M. Polymer Heat Exchanger Pressure Drop -
Residential Models - (UG Fully Open)
F10638-1
Pressure Drop (Ft. of Head) (m of Head)
206A 266/266A 336A
4.0 (1.2)
4.0 (1.2) 4.6 (1.4)
4.0 (1.2) 5.2 (1.6)
4.0 (1.2) 5.8 (1.8) 5.2 (1.6)
4.6 (1.4) 5.8 (1.8) 5.2 (1.6)
4.6 (1.4) 6.3 (1.9) 6.9 (2.1)
4.6 (1.4) 6.9 (2.1) 6.9 (2.1)
4.6 (1.4) 8.1 (2.5) 9.2 (2.8)
4.6 (1.4) 9.2 (2.8) 9.8 (3.0)
6.9 (2.1) 10.4 (3.2) 10.4 (3.2)
8.1 (2.5) 11.0 (3.4) 12.1 (3.7)
F10637-1
399/406A
5.2 (1.6)
6.9 (2.1)
6.9 (2.1)
9.2 (2.8)
9.8 (3.0)
10.4 (3.2)
12.1 (3.7)
17