ERPN-M USER INSTRUCTIONS ENGLISH 02-08
Page 13 of 37
A crane must be used for all pump sets in
excess of 25kg (55lb). Fully trained personnel must
carry out lifting, in accordance with local regulations.
The driver and pump weights are recorded on their
respective nameplates.
2.4 Storage
If the unit will not be put immediately into service, it
should be stored in a dry room. To avoid any damage
during the storage period, the influence of any low or
high frequency vibration must be totally inhibited. If
the pump is delivered sealed in a plastic-wrapper, it is
of max. importance to avoid any damage of that
wrapper, because this will protect the pump against
humidity. Therefore it must be checked if this wrapper
has become cracked and if so, the wrapper must be
renewed.
2.4.1 Long period storage
If the pump is delivered in a plastic bag, the
preservations stands up for one year. If the storage
period exceeds this time, the preservation must be
checked and renewed. Also the air tight plastic bag
must be changed. Moreover we recommend to order
a Flowserve Service Engineer for checking the pump
before the first start up.
2.5 Recycling and end of product life
At the end of the service life of the product or its
parts, the relevant materials and parts should be
recycled or disposed of using an environmentally
acceptable method and local regulations. If the
product contains substances, which are harmful to
the environment, these should be removed and
disposed of in accordance with current regulations.
This also includes the liquids and or gases in the
"seal system" or other utilities.
Make sure that hazardous substances are
disposed of safety and that the correct personal
protective equipment is used. The safety
specifications must be in accordance with the current
regulations at all times.
3.0 DESCRIPTION
3.1 Configuration
The model ERPN-M belongs to Flowserves family of
API 685 magnetic driven end suction pumps.
The pump line is based on a modular system, thus
providing maximum design and operating flexibility.
The pump is available with several impeller designs.
•
closed impeller with front and back wear rings.
Above a certain size the axial thrust is balanced
by balancing holes.
•
semi open impeller with back vanes for abrasive
fluids
•
free flow (recessed) impeller for fluids containing
fibre
All three impeller versions can be combined with an
inducer for low NPSHA applications.
For high suction pressure applications the balance
holes are seized individually to ensure a trouble-free
operation.
The sense of rotation of the pump is
clockwise (CW), looking from the coupling to the shaft
end of the pump.
3.2 Nomenclature
Example:
ERPN-M 150-200 – X-Ind.
150
Discharge nozzle in mm
200
max. impeller size in mm
Ind
Inducer
X:
S
high suction pressure
O
semi open impeller
F
free flow impeller
3.3 Design of major parts
3.3.1 Bearing housing
Made of carbon steel. It is flanged to the pump casing
and provides enough space for mechanical seals
according to API 682.
3.3.2 Pump casing
The pump casing is of volute type. For larger sizes
double volute design is used to minimize radial
forces. Back pull out design for easy maintenance, so
the casing remains on its foundation in case of repair.
3.3.3 Hydraulics
3.3.3.1 Closed impeller
This is the standard version. Both, the impeller and
pump casing have renewable front and back wear
rings. Above a certain impeller size, the axial thrust is
balanced by balancing holes.
3.3.3.2 Free flow impeller
The impeller has straight radial vanes and is mounted
recessed in the pump casing. The axial thrust is
balanced by back vanes.
