PERFORMANCE CURVES
Water CirculationPumps & Circulators
Do it once.Do it right.
Taco Curve Book 300-2.5B Effective Date: January 31, 2004 (Supersedes: March 31, 2002)
HYDRONIC COMPONENTS & SYSTEMS
CI Pumps
FI Pumps
3FLO
W IN
GA
LLO
NS
PE
R M
INU
TE
CA
PAC
ITY
IN L
ITE
RS
/SE
CHEAD IN FEET
HEAD IN METERS
HEAD IN KILOPASCALS (KPa)
PC
-212
5 R
ev B
* P
ump
Mod
els
5013
, 601
3, a
nd 8
013
are
ava
ilabl
e in
116
0 rp
m a
s F
I onl
y.
*
*
*
FI/C
I Pum
p Qu
ick
Sele
ctio
n Cu
rve
1160
RPM
4PC
-212
4 R
ev D
FLO
W IN
GA
LLO
NS
PE
R M
INU
TE
CA
PAC
ITY
IN L
ITE
RS
/SE
C
HEAD IN FEET
HEAD IN METERS
HEAD IN KILOPASCALS (KPa)
*
* P
ump
Mod
els
5013
, 601
3, a
nd 8
013
are
ava
ilabl
e in
176
0 rp
m a
s F
I onl
y.
**
FI/C
I Pum
p Qu
ick
Sele
ctio
n Cu
rve
1760
RPM
5PC
-212
3 R
ev B
FLO
W IN
GA
LLO
NS
PE
R M
INU
TE
CA
PAC
ITY
IN L
ITE
RS
/SE
C
HEAD IN FEET
HEAD IN METERS
HEAD IN KILOPASCALS (KPa)
*
* P
ump
Mod
el 5
007
is a
vaila
ble
in
350
0 rp
m a
s F
I onl
y.
FI/C
I Pum
p Qu
ick
Sele
ctio
n Cu
rve
3500
RPM
6CORRECTION FACTORS FOR OTHER SPEEDS
For speeds other than 1750, hydraulic performance and B.H.P.requirements must be corrected before a selection can be made.
The following multipliers are used to correct performance and B.H.P.
G.P.M. Head B.H.P.
1150 to 1750 1.52 2.31
1750 to 1150 .28
1450 to 1750 1.21 1.46
1750 to 1450 .58
2900 to 3450 1.19 1.42
3450 to 2900 .58
Sizing Procedure
1. Using the proper multipliers correct G.P.M. and head.2. Make pump selection as usual using corrected performance.3. Determine max. B.H.P. requirement for pump selected.4. Correct B.H.P. using multiplier, to lower speed.5. Select motor based on Step 4. Use service factor if applicable.
7PUMP FORMULAS
Pressure = Head (Feet) x Specific Gravity(PSI) 2.31
Head = Pressure (PSI) x 2.31(Feet) Specific Gravity
Vacuum = Dynamic Suction Lift (Feet) x .883 x Specific Gravity(Inches of Mercury)
Horsepower = GPM x Head (Feet) x Specific Gravity(Brake) 3960 x Pump Efficiency
Horsepower = GPM x Head (Feet) x Specific Gravity(Water) 3960
Efficiency = Horsepower (Water) x 100 Per Cent(Pump) Horsepower (Brake)
NPSH = Positive Factors Negative Factors(Available)
Affinity Laws: Effect of change of speed orimpeller diameter on centrifugal pumps.GPM Capacity Ft. Head BHP
ImpellerDiameter Q2 = D2 Q1 H2 = (D2) 2 H1 P2 = (D2) 2 P1Change
SpeedChange
Q2 = RPM2 Q1 H2 = (RPM2)2 H1 P2 = (RPM2)2 P1
Where Q = GPM, H = Head, P = BHP, D = Impeller Dia., RPM = Pump Speed
D22D1
D22D11
2 DD22DD11
3
RPM2RPM1
RPM2RPM1
2 RPM2RPM1
3
8
9
10
11
12
13
14
FEB
RU
AR
Y 1
5, 2
002
15
16
FEB
RU
AR
Y 1
4, 2
002
17
18
FEB
RU
AR
Y 2
0, 2
002
19
FEB
RU
AR
Y 1
2, 2
002
20
FEB
RU
AR
Y 1
8, 2
002
21
FEB
RU
AR
Y 1
2, 2
002
22
FEB
RU
AR
Y 2
0, 2
002
23
FEB
RU
AR
Y 2
0, 2
002
24
FEB
RU
AR
Y 1
2, 2
002
25
26
27
28
Aug
ust 3
1, 2
002
29
30
FEB
RU
AR
Y 1
9. 2
002
31
FEB
RU
AR
Y 2
0, 2
002
32
FEB
RU
AR
Y 2
1, 2
002
33
Aug
ust 3
1, 2
002
34
35
FEB
RU
AR
Y 2
0, 2
002
36
37
38
39
40
41
42
43
44
45
46
FEB
RU
AR
Y 2
, 200
2
47
FEB
RU
AR
Y 1
5, 2
002
48
49
FEB
RU
AR
Y 1
4, 2
002
50
51
FEB
RU
AR
Y 2
0, 2
002
52
FEB
RU
AR
Y 1
2, 2
002
53
FEB
RU
AR
Y 1
8, 2
002
54
FEB
RU
AR
Y 1
2, 2
002
55
FEB
RU
AR
Y 2
0, 2
002
56
FEB
RU
AR
Y 2
0, 2
002
57
FEB
RU
AR
Y 1
2, 2
002
58
59
60
61
Aug
ust 3
1, 2
002
62
63
FEB
RU
AR
Y 1
9, 2
002
64
FEB
RU
AR
Y 2
0, 2
002
65
FEB
RU
AR
Y 2
1, 2
002
66
Aug
ust 3
1, 2
002
67
68
FEB
RU
AR
Y 2
0, 2
002
69
70
71
72
73
74
75
76
77
78
FEB
RU
AR
Y 1
3, 2
002
79
FEB
RU
AR
Y 1
5, 2
002
80
81
FEB
RU
AR
Y 1
4, 2
002
82
FEB
RU
AR
Y 1
8, 2
002
83
FEB
RU
AR
Y 1
2, 2
002
84
FEB
RU
AR
Y 1
2, 2
002
85
86
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2004
TACO, Inc.