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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
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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.
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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
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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.
