Flowserve ESP3 - Manual (Page 11)

ESP3 USER INSTRUCTIONS ENGLISH 26999943 08-11
Page 11 of 64
3.3 Design of major parts
3.3.1 Pump casing
As used by the Mark 3 Product Line. Depending upon
the installation, the casing feet may have been
removed. Axial bolting retains the casing to the cover
and compresses the sealing gasket.
3.3.2 Impeller
Depending on the product, the impeller is either reverse
vane or open. The impeller is threaded to the end of the
shaft
3.3.3 Shaft/sleeve
Solid and sleeved shafts are available. The shaft is
threaded on the impeller end and keyed on the drive
end.
3.3.4 Pump bearings and lubrication
The external thrust bearing is a grease-lubricated
duplex angular contact ball bearing. The radial load
line bearings are sleeve plain bearings lubricated by
product, external flush or grease.
3.3.5 Bearing housing
The external housing contains grease ports and is
sealed with lip seals.
3.3.6 Cover plate
The cover plate has a spigot (rabbet) fit between the
pump casing and adapter for optimum concentricity.
The cover plate holds the throttle bushing at the back
of the impeller.
3.3.7 Shaft seal
There is no shaft seal required near the impeller
since the pump is submerged. Only a small amount
of pressurized fluid escapes through controlled leak
paths from the backside of the impeller. Packing or a
mechanical seal can be fitted above the sump level to
provide vapor proof or pressurized options for the
application.
3.3.8 Driver
The standard driver is a NEMA C-Face vertical electric
motor. The motor must be equipped with a drip-cap
when installed outdoors.
3.3.9 Accessories
Accessories may be fitted when specified by the
customer.
3.4 Performance and operation limits
This product has been selected to meet the
specification of your purchase order. See section 1.5.
The following data is included as additional information
to help with your installation. It is typical, and factors
such as liquid being pumped, temperature, material of
construction, and seal type may influence this data. If
required, a definitive statement for your application can
be obtained from Flowserve.
3.4.1 Alloy cross reference chart
Figure 3-3 is the Alloy cross-reference chart. The
chart is used to material group number which can be
used to establish the pressure-temperature rating as
discussed below. Not all materials may be available
3.4.2 Pressure-temperature ratings
The pressure–temperature (P-T) ratings for ESP3
pumps are shown in figures 3-4 and 3-5. Determine
the appropriate casing “Material Group No.” in Figure
3-3. Interpolation may be used to find the pressure
rating for a specific temperature.
Example:
The pressure temperature rating for a standard GP2-
10” pump with Class 150 flanges and CF8M
construction at an operating temperature of 149˚C is
found as follows:
a) The correct pressure-temperature chart is Figure
3-4.
b) From Figure 3-3, the correct material group for
CF8M is 2.2
c) From Figure 3-4, the pressure-temperature rating
is 14.8 bar.
The maximum discharge pressure must be less
than or equal to the P-T rating. Discharge pressure
may be approximated by adding the suction pressure
and the differential head developed by the pump.
3.4.3 Suction pressure limits
Pump suction pressure is limited by the maximum pump
length and the maximum sump pressure of 3.45 bar (50
psi).
3.4.4 Minimum continuous flow
The minimum continuous flow (MCF) is based on a
percentage of the best efficiency point (BEP).
Figure 3-2 identifies the MCF for all ESP3 pump
models with the exception of the Lo-Flo pump line;
there is no MCF associated with this product line.