The
AVONPUMP range of open impeller centrifugal
pumps has specific applications in handling corrosive, erosive and difficult
liquids which are not easily dealt with by the more conventional pumps
available.
Pumps are available in various configurations. In the horizontal format
we provide both close coupled and long coupled, either of simple construction
or with back pull out facility. In addition a self priming version can
be supplied, our self priming system utilises the twin tank system. Vertical
pumps with shaft lengths (below the support plate) up to five metres can
be supplied. Pontoon mounted pumps can also be supplied.
AVONPUMPS
are available in most metals and engineering plastics, plastic bodied
pumps are encased in a robust steel housing. For stability in the shaft
seal area we prefer to provide plastic bodied pumps with metallic shafts
and impellers, although if metal contact surfaces are mandatory we can
produce plastic covered impellers and shaft ends.
Pump end materials are chosen for the particular duty, and may be made
from , or a combination of, Stainless steels (316 and 304), Titanium,
Hastelloy's, Monel's, Nickel alloys, bronzes and aluminium, with non-metallic
builds in polypropylene, PVDF and PTFE.
Normally we fit mechanical shaft seals, these can be from any major seal
producer. (Some Clients specify a particular make to give uniformity at
site) Choice and arrangement of seals, single, double or tandem is based
on our, and the seal manufacturers, experience for the particular application.
Packed glands can also be provided if specified by the client.
On the long coupled pumps up to 120 deg Centigrade the bearing bracket
is cast iron with ball and roller bearings, oil lubricated and provided
with a constant level oiler with oil retention by lip seals. Over 125
deg we offer cooled bearing brackets fabricated from stainless steel,
cooling is by a coolantjacket with the possible addition of a cooling
fan mounted on the coupling.
Motors and couplings are any Major manufacturer, normally we fit Brook
Hansen motors and Metastream or Neupex couplings. A steel guard is normally
fitted sparkresistant guards are available at extra cost.
Baseplates are robust steel fabrications and include an integral drippan.
Depending on size lifting points are fitted. API bases are available at
extra cost.
All pump and base steel/iron work is finished in AVONPUMP
standard offshore epoxy, 75 microns DFT. Other paint systems can be provided
at extra cost. Motors are in their makers standard finish.
Bolting is stainless steel. Housing gaskets are either PTFE or spiral
wound metal/ptfe depending on the application.
All
AVONPUMPS are subjected to works tests
comprising an unwitnessed hydrotest and an unwitnessed performance test
at 50 hz speed. If the pumps are being supplied as `bare shaft units'
or if client is to supply and fit the motor at site, we will test with
a slave motor. All performance test results are converted to motor nameplate
speed from the test speeds.
Other tests such as NPSH, Vibration and Noise are available at extra cost,
as are tests witnessed by the client or his representatives.
Because of our open impeller design, rotating in a concentric housing,
with generous clearances AVONPUMP
efficiencies are somewhat lower than those of conventional pumps with
shrouded impellers and volute housings. Thus for routine duties where
corrosion or erosion is not a problem we would not be competitive on price
or power with mass produced pumps. AVONPUMPS
fill the gaps where corrosion, erosion, low npsha and non standard applications
arise. |