Pump Performance - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

For commercial buildings
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Type
Circulator
Close-coupled,
end suction
Frame-mounted,
end suction
Double suction,
horizontal
split case
Horizontal split
case,
multistage
Vertical inline
Vertical
turbine
Source: ASHRAE Handbook—1996 Systems and Equipment
INBOARD
FRAME
BEARING
PUMP
SHAFT
OUTBOARD
BEARING
Fig. 52. Typical Cross-Section of an End Suction Pump.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
CHILLER, BOILER, AND DISTRIBUTION SYSTEM CONTROL APPLICATIONS
Table 2. Characteristics of Centrifugal Pump Types.
Impeller
Type
Single
suction
Single
suction
Single
suction
Double
suction
Single
suction
Single
suction
Single
suction
CASING
OUTLET
IMPELLER
IMPELLER
RING
INLET
ROTATING
ELEMENT
MECHANICAL
SEAL
M10509
No. of
Impellers
Casing
One
Volute
One or two
Volute
One or two
Volute
One
Volute
Two to five
Volute
One
Volute
One to twenty
Diffuser

PUMP PERFORMANCE

The performance of a given pump is expressed in a curve
showing pump pressure versus flow. Figure 53 shows a typical
curve. The pump pressure is expressed in kilopascals which
describes pump operation independent of water temperature or
density. Pressure losses in piping and components used in HVAC
systems are always calculated in kilopascals.
Fig. 53. Typical Pump Pressure Capacity Curve.
337
Motor
Motor
Mounting
Connection
Position
Flexible-
Horizontal
coupled
Close-
Horizontal
coupled
Flexible-
Horizontal
coupled
Flexible-
Horizontal
coupled
Flexible-
Horizontal
coupled
Flexible- or
Vertical
close-
coupled
Flexible-
Vertical
coupled
FLOW
INC
C2907

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