Weil-McLain SlimFit Manual page 15

SlimFit
™
commercial condensing gas
Install water piping
Recommended pipe sizing
Size the piping and the pumps to provide the required temperature rise.
See Figure 11 for boiler head loss curves. See Figure 13 for maximum and
minimum flow rate through the boiler as well as head loss vs flow rate.
Size system piping following Figure 12 or apply recognized engineering
practices to size the piping.
DO NOT design the piping and components for
a boiler flow rate above or below the range given in
Figure 13. Insufficient flow will cause nuisance outages due
to limit operation. Excessive flow can damage the boiler heat
exchanger from erosion.
For applications requiring system flow rates higher or lower
than those allowed in Figure 13, use ONLY primary/second-
ary piping. Size the boiler pump for the proper flow rate.
Figure 11
Boiler head loss vs flow rate for SlimFit boilers
Figure 12 Recommended pipe sizing vs flow rate
Sch 40 Maximum
Pipe Flow rate
Diameter GPM
2 45
3 140
4 290
5 500
For pipe sizes other than 3 inch, provide reducers to adapt
from external piping to the boiler 3-inch supply and return
flanged connections.
Part number 550-100-116/0713
-
fired water boiler
(continued)
Sch 40 Maximum
Pipe Flow rate
Diameter GPM
6 800
8 1650
10 3000
12 4750
— Boiler Manual
DO NOT design for flow rates above or be-
low the range listed in Figure 13. The boiler
and system components can be damaged by
excessive or insufficient flow. Temperature
rises shown below apply to water only. For
glycol/water applications, the temperature
rise will be different, but the flow rate must
be maintained within the range listed below.
Figure 13 Flow rate and pressure drop data for
Slim-Fit boilers
SF1000
Temperature Rise (°F)
GPM
43 44.5
50 38.3
** 63 30.4
70 27.4
80 24.0
90 21.3
96 20.0
** Suggested design flow rate (30°F temp. rise, water only)
SF1500
Temp.
GPM
Rise °F
64 44.9
75 38.3
** 96 29.9
105 27.4
120 24.0
135 21.3
144 20.0
** Suggested design flow rate (30°F temp. rise, water only)
SF2000
Temp.
GPM
Rise °F
85 44.8
100 38.1
** 127 30.0
140 27.2
160 23.8
180 21.2
191 20.0
** Suggested design flow rate (30°F temp. rise, water only)
AT FULL INPUT
Boiler head loss (Feet w.c.)
4.1
5.1
7.4
8.7
10.9
13.3
14.8
Boiler head loss
Feet w.c.
4.8
6.3
9.7
11.3
14.3
17.7
19.9
Boiler head loss
Feet w.c.
6.6
7.8
11.5
13.5
16.9
20.6
22.8
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