Flowserve Worthington WXB - Manual (Page 13)

WXB USER INSTRUCTIONS ENGLISH - 07/14
Page 13 of 51
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 WXB belongs to Flowserves family of
barrel pumps.
The pump line is based on a modular system, thus
providing maximum design and operating flexibility.
The maximum allowable working pressure range is
from 100 bar for the smaller sizes up to 150 bar for
the larger sizes. The pump is equipped with a
balancing device for axial thrust compensation,
usually used for heavy boiler feed service and
hydrocarbon service.
It can be combined with an inducer for low NPSHA
applications.
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:
3 WXB-10A8 – Ind.
3
Discharge nozzle in inch.
B
Barrel
10
max. impeller size in inch
A
type of hydraulics
8
no. of stages
Ind
Inducer
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 Discharge and Suction head
Both heads are designed for the maximum allowable
working pressure. To avoid any distorsion due to
thermal expansion, centerline mounting is obligatory.
3.3.3 Balance device
To compensate the axial thrust a balancing device,
consisting of a straight drum and a steped drum head
is used. The step in the drum head separates the flow
at the drum from the influence of the last stage
impeller. This results in a smooth pressure
distribution across the drum surface, which increases
the rotordynamic stability and axial thrust
compensation.
3.3.4 Hydraulics
The hydraulics consists of three parts:
•
Impeller with wear rings
•
Multivaned diffuser with return vanes, for radial
load compensation
•
Channel ring, as internal pressure boundary and
cross over to next stage