Flowserve HWX Worthington - Manual (Page 13)

HWX USER INSTRUCTIONS ENGLISH - 07/14
Page 13 of 40
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 HWX pump is a vertical, single-stage, single
suction, radially split centrifugal process pump. The
pump conforms to the specifications outlined in API
610/682 and is intended for continuous duty service
in all process and industrial applications within
specified pressure and temperature limitations.
Maintenance of the pump is facilitated by the in-line
configuration, use of cartridge mechanical seals, and
a spacer coupling designed to allow a back pull-out
disassembly of the internal pump parts.
The sense of rotation of the pump is counter
clockwise (CCW), looking from the coupling to the
shaft end of the pump.
3.2 Nomenclature
The pump size will be engraved on the nameplate
typically as below:
3x4x7 A-HWX
Nominal discharge branch size
Nominal suction branch size
Nominal full size impeller diameter
Casing pattern type
Pump type
The typical nomenclature above is the general guide
to the HWX 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 casing is of single or dual volute design that
reduces forces on the rotating element thereby
minimizing vibration and shaft deflection.
Dual volute is standard on many 3 inch discharge
pumps and on all pumps above 3 inch discharge.
Single volute is standard on some 3 inch discharge
pumps and on all smaller sizes.
The fluid passages are designed to prevent
turbulence and emphasize streamline flow.
Motor support heads are mounted directly on the
casing for a true back-pull-out of the pump rotor
without disturbing the driver electrical connections,
nor casing.
3.3.2 Impeller
The HWX impeller is a fully shrouded, radial flow,
single suction design. All sizes are precision cast to
assure the highest attainable efficiency. All impellers
are dynamically balanced keyed to the shaft and
secured by locknut and lockscrew. Renewable wear
rings are press fit onto the impeller hubs (front and
back) and positively secured with axial screws or tack
welding.
3.3.3 Casing cover
The casing cover is either fabricated from plate or
cast, depending on the material of construction.
Designed to the dimensional standards within the API
682 specification, the seal chamber can
accommodate a wide variety of single or dual seal
arrangements as standard.
3.3.4 Shaft
The shaft is of ample strength and rigidity. It is
precision machined over its entire length and has
generous fillet radii at each change of section to
reduce stress concentrations. Shaft deflections at the
seal chamber are minimal and fall within the
guidelines stated in API 610.
3.3.5 Bearing housing
There are two types of bearing housing, depending
on the desired lubrication: pure oil mist, and Oil
Cascade sump. To maximise parts interchangeability,
there are only two sizes of bearing housings and
bearings used for all pump sizes. Operating speeds
are from 900 to 3600 r.p.m. TRICO constant level
oiler is supplied as standard for Oil Cascade sump
and no constant level oiler is supplied for pure oil
mist.