WATSON MARLOW
Abrasive slurry
With 50% solids, the oxide-water mix that a major roof tile manufacturer uses
to color his products is highly abrasive.
The plant engineer tried piston pumps, but abandoned them when the slurry
was effectively being de-watered: the pumps pumped the water, but left the
solids to clog the cylinders. He tried centrifugal pumps, but poor flow control
led to inconsistent coloring.
The plant was then converted over to Watson-Marlow Bredel 720 pumps. The
slurry remained uniform and could be applied in precise quantities. Since the
fluid is contained within the tube, the pump cannot clog. In addition, the pump
is small enough to be conveniently set up in various parts of the factory, and its
impervious casing protects the pump in a washdown environment.
Construction materials:
All 720 pumpheads are designed for strength and durability. Pumphead track: epoxy coated aluminum; drive
shaft: stainless steel 440C; rotor end plates: aluminum; cradle assembly, track: aluminum epoxy finished; central shaft: EN24 steel; rollers:
MOS2 filled Nylon 6 (Nylatron); springs, spindles: stainless steel
NOW SELECT
YOUR DRIVE
PAGES 14-15
720 pumpheads: flow ranges, 360rpm
720R continuous tubing
720RE elements
Tube or element bore, mm
Tube or element bore, inch
Tube number
Can and groove connector size, inch
9.6
3
/
8
193
-
12.7
1
/
2
88
-
15.9
5
/
8
189
-
19
3
/
4
191
-
25.4
1
92
-
12.7
1
/
2
-
1
15.9
5
/
8
-
1
19
3
/
4
-
1
25.4
1
-
1
GPM
0.0005-1.8
0.001-3.5
0.001-4.8
0.002-6.6
0.003-8.8
0.001-3.5
0.001-4.8
0.002-6.6
0.003-8.8
liters/min
0.002-6.9
0.004-13.2
0.005-18.3
0.007-25.2
0.009-33.3
0.004-13.2
0.005-18.3
0.007-25.2
0.009-33.3
GPM with pressures to 30 psi
13
Flow listed is per channel. Double your flow by adding a 720RX or 720REX extension pumphead as shown below.