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environment, these should be removed and disposed
of in accordance with current regulations. This also
includes the liquids and or gases that may be used in
the "seal system" or other utilities.
Make sure that hazardous substances are
disposed of safely and that the correct personal
protective equipment is used. The safety
specifications must be in accordance with the current
regulations at all times.
3 PUMP DESCRIPTION
3.1 Configuration
The PVML type pump is a heavy duty, single stage,
vertical closed coupled type centrifugal pump,
designed for petrochemical complexes, chemical
plants, general service and circulating applications. It
can only be used with an electric motor.
3.2 Name nomenclature
The pump size will be engraved on the nameplate
typically as below:
Configuration – see 3.1 above.
Nominal impeller size (cm)
Nominal suction branch size (cm)
Nominal discharge branch size (cm)
Nominal max. impeller diameter & type.
The typical nomenclature above is the general guide
to the PVML configuration description. Identify the
actual pump size and serial number from the pump
nameplate. Check that this agrees with the applicable
certification provided.
3.3 Design of major parts
3.3.1 Pump casing
The pump has its main casing gasket axial to the shaft
allowing maintenance to the rotating element by
removing the back pull out unit. Suction and
discharge branches are at the casing and therefore its
piping remain undisturbed at maintenance.
3.3.2 Impeller
The impeller is fully shrouded and is fitted with
impeller wear rings.
3.3.3 Diffuser
The diffuser is tuned to the impeller and the multi
channel diffuser is concentric aligned around the
impeller
PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05
PVML 30-20-20-30F
Page 10 of 29
3.3.4 Extended Motor Shaft
The extended motor shaft, mounted on the motor
bearings is of the dry shaft design and has a keyed
drive end.
3.3.6 Stuffing box
The stuffing box has a spigot (rabbet) fit between
the pump casing and seal plate for optimum
concentricity. The design enables a number of
sealing options to be fitted.
3.3.7 Shaft seal
The mechanical seal(s) attached to the pump shaft
seals the pumped liquid from the environment.
Gland packing may be fitted as an option, for non-
hazardous service only.
3.3.8 Driver
The driver is an electric motor.
3.3.9 Accessories
Accessories may be fitted when specified by the
customer.
3.4 Performance and operating limits
This product has been selected to meet the
specifications 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 temperature, materials, and seal type may
influence this data. If required, a definitive statement
for your particular application can be obtained from
Flowserve.
3.4.1 Operating limits
Pumped liquid temperature limits*
Maximum ambient temperature*
Maximum soft solids in
suspension*
Maximum pump speed
3.4.2 Pump and impeller data
Impeller
Nominal wear
maximum
ring diameter
Pump size
size
Small / large
mm (in.)
PVML 25.04.04 220 (8.66)
PVML 25.08.08 240 (9.45)
90/130 (3.54/5.12)
PVML 25.10.10 235 (9.25)
130/-- (5.12/--)
PVML 25.15.15 242 (9.53)
165/200 (6.50/7.87) 0.45/0.50 (0.018/0.020)
PVML 30.20.20 290 (11.42) 220/265 (8.66/10.43) 0.50/0.55 (0.020/0.022)
PVML 35.08.08 370 (14.57)
110/130 (4.33/5.12) 0.38/0.43 (0.015/0.017)
PVML 35.10.10 370 (14.57)
130/140 (5.12/5.51) 0.43/0.43 (0.017/0.017)
PVML 35.15.15 354 (13.93) 180/220 (7.09/10.43) 0.48/0.50 (0.019/0.020)
PVML 35.20.20 350 (13.78)
220/275(7.09/10.83) 0.50/0.58 (0.020/0.023)
PVML 40.10.10 420 (16.54)
130/140 (5.12/5.51) 0.43/0.43 (0.017/0.017)
PVML 40.15.15 420 (16.54)
220/275(7.09/10.83) 0.50/0.58 (0.020/0.023)
up to +260 ºC (500 ºF)
up to +40 ºC (104 ºF)
up to 1 % by volume
(refer for size limits)
refer to the nameplate
Min.
diametral
wear ring
clearance
mm (in.)
mm (in.)
90/-- (3.54/--)
0.35/-- (0.014/--)
0.35/0.43 (0.014/0.017)
0.43/-- (0.017/--)
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