WATSON MARLOW
NOW SELECT
YOUR DRIVE
PAGES 14-15
Construction materials:
All 520 pumpheads are constructed of high performance engineering plastics and stainless steel to defeat chemical
attack from process fluids and cleaning agents. The pumps are tough enough for the most arduous environments. Pumphead track: PPS;
guard, inner/outer: polycarbonate; guard seal: Neoprene; rotor hub: 316 stainless steel; roller arms, rotor cover: PPS; rollers, main/guide: 316
stainless steel; main roller bearings: stainless steel with PTFE seals; drain port and nut: polypropylene; drain plug: Hytrel
Water treatment
A water company in Washington State has replaced diaphragm pumps with
Watson-Marlow Bredel 520 series pumps to inject sodium hypochlorite into a
mains supply at 70 psi. The diaphragm pumps would periodically vapor lock on the
gaseous hypo and with flow rate variations between 0.291 GPH and 2.01 GPH,
accuracy and turndown were a problem.
With the new 520 high pressure pumps installed, vapor locking is no longer an
issue, and the huge million:1 flow range capability easily handles their seasonal
hypo needs…now and for years to come.
Initial set up couldn’t be easier. The pump integrates effortlessly into existing
SCADA control systems and on the wet end, the quick-connect pipe fittings make
setup and maintenance a snap.
Performance was
achieved using
30 psi peak
pressure
520REL 0-30 psi element performance
Performance was
achieved using
60 psi peak
pressure
520REM 30-60 psi element performance
Performance was
achieved using
100 psi constant
pressure
520REH 60-100 psi element performance
520R & 520R2 pumpheads: flow ranges, 0.1-220 rpm, GPH*
Tube bore, mm
Tube bore, inch
Tube number
0.5
1
/
50
112
0.8
1
/
32
13
1.6
1
/
16
14
3.2
1
/
8
16
4.8
3
/
16
25
6.4
1
/
4
17
8.0
5
/
16
18
9.6
3
/
8
193
520R &
520R2
(continuous
tubing)
Neoprene
®
Sta-Pure
®
Chem-Sure
®
PVC, Pumpsil
®
0.00006
-0.151
0.00002
-0.380
0.0006
-1.538
0.0029
-6.182
0.0063
-13.791
0.0111
-23.778
0.0174
-38.045
0.0254
-55.482
Marprene
®
64 shore tubing
0.00006
-0143
0.00002
-0.365
0.0006
-1.458
0.0027
-5.865
0.006
-13.157
0.0106
-23.778
0.0174
-36.46
0.0238
-52.312
Flourel
®
0.0005
-1.11
0.0021
-4.439
0.0046
-9.987
0.0081
-17.437
0-0127
-28.534
520 LoadSure
®
element pumpheads: flow ranges, 0.1-220 rpm, GPH*
Tube bore, mm
Tube bore, inch
Quick release connectors
3.2
1
/
8
1
/
2
”
6.4
1
/
4
1
/
2
”
9.6
3
/
8
1
/
2
”
520REL
(elements to 30 psi)
Neoprene
®
, Chem-Sure
®
, Pumpsil
®
0.0029-6.182
0.0111-23.778
0.0254-55.482
Marpene
®
TL
0.0027-5.865
0.0106-23.778
0.0238-52.312
520REM
(elements to 60 psi)
Chem-Sure
®
0.0029-6.182
0.0111-23.778
Marprene
®
TM
0.0027-5.865
0.0106-23.778
520REH
(elements to 100 psi)
Marprene
®
TH, Sta-Pure
®
0.0032-7.133
520R and 520R2 continuous tube performance
Flow rate (ml/min)
Flow rate (GPH)
Drive Speed (rpm)
Flow rate (ml/min)
Flow rate (GPH)
Drive Speed (rpm)
Flow rate (ml/min)
Flow rate (GPH)
Drive Speed (rpm)
55 GPH, with pressures to 100 psi
9
*1gal/hr = 63.1ml/min
*1gal/hr = 63.1ml/min