Plumbing Connection 3-2015

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PLUMBING CONNECTION SPRING 2015 67
and vibration. Then let the pump
vendor select the best pump for
the job; unrestrained by silly speed
constraints. The best speed may be
2980 or 1450, or 980rpm or even
lower. It depends on your hydraulic
conditions.
But what about multi-stage pumps
and what about the impact of running
speed on suction conditions? I will talk
about these issues next time.
Next article: Are your pumps running
too slowly? – the sequel.
BLOKES HEALTH ..................................$19.95
A DOCTOR’S GUIDE (CODE 811)
This is an absolute gem of a publication
and a valuable resource for men of all ages.
Written by ManSpace’s Doctor-in-Residence,
Dr Bernie Crimmins, Blokes Health provides
extremely useful health advice in a simple
manner. There aren’t many books you can
buy that could actually SAVE YOUR LIFE!
$19.95*
CODE 811
BLOKES’ HEALTH 2...............................$19.95
DEPRESSION, DIABETES AND DICKS!
(CODE 826)
Following in the footsteps of Dr Bernie
Crimmins original best-seller, Blokes’ Health:
comes Blokes Health 2. We all want to live
as long and as healthy as we can, with good
quality of life. In this book Dr Bernie Crimmins
outlines the main health problems that affect
males and gives some simple advice on how
to prevent, or detect early, those particular
diseases which may lead to an early demise.
$19.95*
CODE 826
Simply complete the
TRADESTUFF order form on
page or buy online at
*All prices include postage throughout Australia.
We also pay GST and employ Australians, unlike
overseas online suppliers. Go Aussie!
FIG 5: POWER COSTS
FIG 6: HEAD IN METRES V VOLUMETRIC FLOWRATE
TOTAL HEAD IN METRES (M)
VOLUMETRIC FLOW RATE IN CUBIC METRES PER HOUR (m3/h)
2980 RPM 55 L/S @ 70 M 1490 RPM
1
5
6
8
10
20
30
40
50
60
80
90 100
2 3 4 5 6 8 10 20 30 40 50 60 80 100 200 300
1000 800 600 400 300 200 150 100 75 50 40 30 20 15 10 86 4
900 700 500
125 X 100 - 250
80% EFFICIENCY AT DUTY
PEAK EFFICIENCY = 81%
DUTY POWER: 47 kW
IMPELLER dia : 230mm
125 X 125 - 500
69.5% EFFICIENCY AT DUTY
PEAK EFFICIENCY = 70%
DUTY POWER: 54 kW
IMPELLER dia : 460mm
LOWER
CAPITAL COST
POWER COST
$6,000-00 PA.
PENALTY @ 10C/kWhr
12 MONTHS
CONTINUOUS
LITRES PER SECOND (L/S)
1470 r/min
ABOUT RON
Ron Astall is a Mechanical Engineer with
extensive pump industry experience
including Engineering, Contract
Management, Applications, Sales, Marketing
and Quality Assurance; particularly in the
Process and Petrochemical Industries in his
role at United Pumps Australia.
With his consultancy, Astech Pumping
Services and through Strategic Achievement,
he has also been an active provider of
pump industry training. Ron is the current
President of Pump Industry Australia (PIA)
and Contracts Manager at United Pumps
Australia.
47% 60%
48%
80%
80%
36%
49%
60%
88% 85% 82% 71%
78%
40% 56% 66% 74% 76% 85% 84%
87%
88% 66% 73% 81%
82%
76%
52%
56%
40%
43% 57%
51% 63% 74%
78%
82% 80%
76% 68% 82%