HPXM USER INSTRUCTIONS ENGLISH 14983571 - 03/11
Page 13 of 48
and then through the volute to the discharge nozzle.
The casing has mounting feet integrally cast on the
centerline of the pump thus giving a rigid construction
and preventing distortion in high temperature
applications.
3.3.2 Inner casing cover
The inner casing cover is bolted onto the casing
cover. The volute design is of the constant-velocity
type which provides a continuous rise to shutoff while
minimizing radial thrust loads. The result is a pump
with low flow stability.
The volute insert is custom machined for each
application; this results in the best efficiency point for
any given set of hydraulics.
3.3.3 Impeller
The impeller has a full-back-shrouded radial-vane
design with a unique balancing configuration. The
impeller is dynamically balanced, keyed to the shaft
and secured by locknut and lockscrew.
3.3.4 Inducer
Inducers are available on most pump models for low
NPSH conditions. The inducer replaces the standard
impeller locknut and lockscrew. It is secured by
proper cap nut and security washer.
3.3.5 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 'Table 1', the seal chamber can
accommodate a wide variety of single or dual seal
arrangements as standard.
3.3.6 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 8th Edition.
An optional extra heavy duty shaft design, with very
low l3/d4 values, is available on most centerline
discharge pump sizes.
3.3.7 Bearing housing
The bearing housing is fitted with an end cover on the
outboard end for ease of inspection and
maintenance. Each end of the housing is fitted with a
standard labyrinth type shaft seal (made from non-
sparking materials) to effectively retain the oil and
prevent entry of any foreign matter. Special
outsourced baring isolators are available as an
option. The standard bearing lubrication is provided
by a shaft mounted metal slinger that transfers oil to
bearing feed galleries within the housing wall.
Ring oil lubrication is optional. Two metal slingers are
positively locked on the shaft with set screws and
bearing lubrication is provided by a heavy duty oil
ring. A plugged port on the top of the bearing housing
is positioned to allow visual inspection of the oil ring.
Oil mist lubrication is optional; “Purge” oil mist
provisions are available on either slinger or ring oil
designs. “Pure” oil mist (no slinger, no oil ring) is also
available. TRICO constant level oiler is supplied as
standard. For purge oil mist, a balanced type oiler is
used. No oiler is supplied for pure oil mist. When
application requires, the standard cooling system is a
fan, either with slinger or oil ring lubrication. Optional
water cooling is available, should this be a customer
preference.
3.3.8 Pump bearings and lubrication
Heavy duty, single row deep groove radial bearing
and duplex angular contact thrust bearings arranged
back to back ensure long life under the most severe
operating conditions. The bearings have a sliding fit
in the bearing housing and a light interference fit on
the shaft in accordance with AFBMA
recommendations. Lubrication of the bearings is
provided by oil rings, thrower, purge mist or pure mist
as a customer option.
3.3.9 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.
3.3.10 Driver
The driver is normally an electric motor. Different
drive configurations may be fitted such as internal
combustion engines, turbines, hydraulic motors etc
driving via couplings, belts, gearboxes etc.
3.3.11 Coupling/Coupling guards
Flexible spacer couplings are provided in various
makes and models to suit customer preference.
(Aluminium non- hinged guards are provided)
3.3.12 Baseplate
Standard baseplates are welded steel, drain pan type
in conformance with API 610 standardised
dimensions. Horizontal driver alignment screws and
vertical baseplate levelling screws are provided when
required by API.
Special baseplates can be supplied to suit individual
installation circumstances
.
