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Table : Fitting and Valve Equivalent Length
Copper Fitting and Sweat Valve
Equivalent Length (Ft)
Fitting or Valve
Description
90° Elbow
45° Elbow
Tee (thru flow)
Tee (Branch flow)
Diverter Tee (typical)
Gate Valve
Globe Valve
Angle Valve
Ball Valve
(standard port)
Ball Valve (Full Port)
Swing Check Valve
Flow-Check Valve
(typical)
Butterfly Valve
Example:
Assume that ALP105 will be installed in a heating
system along with the Alliance AL27SL indirect
water heater. A total of 15 ft of straight pipe will be
needed between the boiler and the heating system.
A total of 20 ft of straight pipe will be installed
between the boiler and the indirect water heater.
Copper ball valves, black threaded fittings and black
pipe are specified. Fittings are arranged as shown in
Figure 22A (Shaded Portion). The heating system
piping and indirect water heater piping are sized
based on 25° F temperature drop.
Fittings used in the Boiler Loop and equivalent
length of each fitting are shown in Table below:
Fitting
Qty.
Description
Used
90° Elbow
5
Swing Check
1
Valve
Ball Valve
4
(Standard Port)
Tee (Thru Flow)
1
Total Equivalent Length of All Fittings,
Ft of Straight Pipe
Note: Unions, System Connection, Connection Tees
and factory- supplied fittings are ignored for above
calculations.
Copper Pipe or Valve Size
1
1¼
1½
2.5
3.0
4.0
1.0
1.2
1.5
0.5
0.6
0.8
4.5
5.5
7.0
23.5
25.0
23.0
0.3
0.4
0.5
25.0
36.0
46.0
5.3
7.8
9.4
4.3
7.0
6.6
1.9
1.4
2.2
4.5
5.5
6.5
54.0
74.0
57.0
2.7
2.0
2.7
Total
Fitting
Equivalent
Equivalent
Length
Length, Ft
of Fittings, Ft
2.6
13.0
8.7
8.7
4.3
17.2
1.8
1.8
40.7
Table : Fitting and Valve Equivalent Length
Threaded Fitting and Valve Equivalent Length (Ft)
Fitting or Valve
2
Description
5.5
90° Elbow
2.0
Long Radius
1.0
Elbow (45° or 90°)
9.0
Tee (thru flow)
23.0
Tee (Branch flow)
0.7
Close Return Bend
56.0
Gate Valve (full open)
12.5
Globe Valve (full open)
Angle Valve (full open)
14.0
Swing Check Valve
1.3
(full open)
9.0
Flow-Check Valve (typical)
177.0
Total Boiler Loop Piping equivalent length is: 15 ft
(straight pipe) + 40.7 ft (straight pipe) = 55.7 ft of
4.5
straight pipe.
Reading Table 10 " Recommended Circulator
Selection", model ALP105, Taco 0014 model may be
selected as Boiler Loop circulator and will provide the
flow within range specified in Table 9 "Flow Range
Requirement Through Boiler".
Fittings specified for the Indirect Water Heater Loop
Piping are arranged as shown in Figure 23A (Shaded
Portion).
All Indirect Water Heater Loop fittings and each fitting
equivalent length are shown in Table below:
Fitting
Description
90° Elbow
Tee (Branch Flow)
Swing Check Valve
Ball Valve
(Standard Port)
Total Equivalent Length of All Fittings,
Ft of Straight Pipe
Total Indirect Water Heater Piping equivalent length is:
20 ft (straight pipe) + 48.7 ft (straight pipe) = 68.7 ft of
straight pipe.
Reading Table 10 " Recommended Circulator
Selection", for model ALP105 with Temperature Drop
of 25°F, Taco 0014 model may be selected as Indirect
Water Heater Loop circulator.
(cont'd)
Black Threaded Pipe or
1
2.6
1.4
1.8
5.3
4.4
0.7
30.0
39.0
13.0
17.0
8.7
12.0
42.0
60.0
Fitting
Qty.
Equivalent
Used
Length, Ft
8
2.6
2
5.3
1
8.7
2
4.3
Valve Size
1¼
1½
2
3.5
4.0
5.2
1.8
2.2
2.8
2.3
2.7
3.5
6.9
8.1
10.0
5.8
6.7
8.6
0.9
1.1
1.4
46.0
59.0
20.0
26.0
13.0
17.0
63.0
83.0
Total
Equivalent
Length
of Fittings, Ft
20.8
10.6
8.7
8.6
48.7
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