high-density pumps are extremely rugged and reliable, and
are designed to develop high pressure with little or no
engineering in critical areas assures long-term reliability
even in the demanding operation of pumping high consistency
very successful concept of twin-intermeshing pump screws is
continued in the new 2601 series.
The design changes that have been incorporated are
directed specifically at making on-site repairs by mill
personnel easier, faster, and more economical.
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lower operating costs
achieves consistencies of 14-16 percent
output through the bleach plant by as much as one-third
or more, without increasing baseline production costs
meet environmental regulations by dramatically reducing
the usage of both water and bleaching chemicals
usage reduced by at least one-third, saving
approximately 300 million gallons per year
chemical consumption efficiency in the bleaching tower,
reducing chemical costs by as much as $1 million per
the horsepower required to pump thick stock by as much
as 50 percent
of steam required to heat the stock in the bleaching
process is reduced , saving as much as $1.3 million per
year per stage in energy costs
high-density pumps handle all kinds of pulps:
casing (body, front and rear brackets) is stainless steel.
The front and rear heads are cast iron.
All metal thickness are adequate for maximum Stress
conditions with an additional 3/8 corrosion
bores are hard surfaced to offset the erosive effect of the
stock and to prevent the characteristic galling of
austenitic stainless steels.
pump body is composed of three separable parts: front casing
(discharge section), rear casing (suction section) and the
main body (pressure generation section).
Thus, the pressure generation section, containing the
body bores, can be replaced independently of the front and
rear casings, resulting in substantial savings.
pump bore wear often is concentrated at the top or bottom;
the new three-piece body is designed to be rotated 180
degrees to compensate.
Air bleed ports are conveniently located at both top
added advantage of the three-piece body is that the
discharge nozzle can be positioned on either the right or
left side of the discharge section.
Mounting feet are cast on both sides of the body.
The suction section has two large clean-out holes.
This is a screw type pump using two pumping screws and two
auxiliary feeders mounted on the same shafts as the screws.
A discharge feeder is used on one shaft to achieve
uniform, steady discharge of stock.
The shafts are protected from packing wear by
hardened, tube-type sleeves that keyed and extended under
the oil seals. Stainless
steel is used throughout.
gears are precision cut, spur gears which are timed at the
factory to maintain proper clearance between pumping screws.
They are SAE 8620 steel, carburized, hardened and
four radial bearings are heavy-duty roller type, sized to
handle any anticipated maximum load.
Both the bearings and the timing gears are lubricated
by the splashing of the gears in a large oil reservoir.
The thrust bearings are a steep-angle, tapered roller
type in a double roller design capable of carrying both the
axial thrust and the radial loads.
To prevent excessive pre-loading of the thrust
bearings, the separable cones are positioned with a
The bearings are lubricated from an oil reservoir in
the rear head.
Bearing brackets are fabricated from heavy steel rather than
machined from castings.
This design allows the use of stainless steel in the
area of the bracket in contact with the stock, while the
rest of the bracket is standard steel.
The fabricated brackets have greatly enlarged areas
for access to the glands and stuffing boxes for easy
lip seals with opposed lips are used. The cavity between lips is grease filled to provide
added insurance against water entering the seal areas.
stuffing boxes are extra deep and are designed to minimize
shaft sleeve and packing wear.
They are equipped with lantern rings.
Special porting permits water or other liquids to be
introduced into the lantern ring to keep stock out of the
packing area. Each
stuffing box has a replaceable throat bushing.
Glands are split for easy removal and better access
to the packing. Only
two stuffing boxes are under discharge pressure.
The 2601 series
high-density stock pumps and their rotating elements are
dimensionally interchangeable with the original Warren