Independent Testing

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Above, large Stelth Pump prototype. Pressure transducers map the internal pressure zones within the pump while it is running.

The Stelth Pump has periodically been independently tested and validated.

A History.

People understandably expect testing of the Stelth Pump by independent authorities.

Preceded by many years of our own R&D and testing in our own test rigs; here’s how and when that independent testing and validation started and how it presently continues.

  • This website is specifically for the attention of pump manufacturers or otherwise pump literate or technical people.
  • You do not need to interpret the Chinese Gov, ITT (Xylem) or Koller charts! Extracts are provided for those who can or who you want to show them to and so they are immediately viewable here to support our performance claims. Also, the full reports are available; just ask.

Also this page should be read as a history and so the early Stelth Pumps, while way ahead of competitors, were not as efficient as the latest due simply to development over time.

We took prototypes of a Stelth Bilge pump, Stelth Automotive engine cooling pump and two Stelth Spa pumps, plus 3 manufactured competitor pumps to China for back to back testing.

We had them tested at Leo and Dayuan pump companies and also at the “Product Quality Supervising and Inspecting Institute of Taizhou City” a Chinese Government testing lab.

This validation step was so we could build upon credible and independent testing, justifying increasing effort.

It also made us confident that granting a manufacturing license to Koller was safe for them and us, in that we then knew they would not get a failure when they finally manufactured.

  • Now it has become the most powerful and efficient spa pump in the world and it is implicit that it will become the most powerful and efficient when applied to almost all other pumping categories.
  • Koller Whirlpool of Austria also prove the operating principal, efficiency and manufacturability, because the Stelth principle is the same for all the industries our pump will be applied to.

It also made us confident that granting a manufacturing license to Koller was safe for them and us, in that we then knew they would not get a failure when they finally manufactured.

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Fig 3, at right is an extract from the Koller report from their “Ecolution” brochure.

9 dBA less (from the Koller noise report) for the Stelth, is 8 times quieter than same size competitors. The other columns are correct. Koller noise report available. Ask us to email it to you.

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Fig, 4 at left, Koller publish that the Stelth 600-watt pump is far better than their old 800-watt pump.

Download the Koller brochure.

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We also tested at the Leo Pump Company in China. see below.

Fig 5, at right, The chart, for engineers, is for Leo’s own 800-watt spa bath pump. Efficiency % in column 13. It had a BEP of 34.91%.

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Fig 6, at left. Leo’s test of the Stelth 800-watt spa bath pump at BEP of 43.23%. It employed the Koller 800-watt motor.

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Comparing the two charts above show that the Stelth was 23.83% higher efficiency than the Leo pump.

The Gov test lab, “Product Quality Supervising and Inspecting Institute of Taizhou City” also tested the Rule 3700 bilge pump manufactured by ITT, now named Xylem, the world’s largest pump company. The “Rule” brand of bilge pumps are the world’s largest selling bilge pumps.

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Fig 7, at right. smaller Stelth and ITT’s Rule 3700 bilge pumps tested by “Product Quality Supervising and Inspecting Institute of Taizhou City”. Since that historical moment, the Stelth pumps are even smaller and even more efficient.

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Independent Testing

Fig 8, at left. results for the ITT “Rule 3700”. Efficiency % in column 6 from right.

The “RULE 3700” had a Best Efficiency Point of 30.06% @4.83 cubic metres/hour and 183.6 electrical watts. Fig 9 below, shows the Stelth bilge pump performance.

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Fig 9, at right. results for the Stelth bilge pump from same test rig. BEP was 36.98% @5.56 cubic metres/hour and 170 electrical watts. Higher flow using less electricity = lives saved at sea?

This same Stelth bilge pump interchanges as the Stelth car engine cooling pump.

The much smaller Stelth bilge pump was 20.8% higher efficiency than the Rule 3700. All Chinese Gov test reports are available. Ask us to email them.

The much smaller Stelth bilge pump was 20.8% higher efficiency than the Rule 3700. All Chinese Gov test reports are available. Ask us to email them.

Independent Testing
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We point out that this significant and disruptive technology is also going to revolutionise many other pump industries. Reason 1 is that the Stelth principle applies universally. One pump can be interchanged between many different industries. Example: the Stelth 800-watt pump (or any size), manufactured by Koller, goes, absolutely un-altered, into Aquaculture, general water circulation, water transfer, water features +. All these keep the same motor. Additionally, dozens of other industries will use alternative motors but the manufactured Stelth hydraulic wet end will not change. Reason 2 is that innovations recently applied to the Stelth pump also apply to all non-Stelth pumps. We want to drive these 2 points home because some people think pumps for many widely different industries are different types of pumps for each industry! Not so!

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A non-exhaustive list of Stelth Pump applications is:

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  • Rural/agriculture for irrigation and transfer, driven by electric motors, internal combustion engines and also solar.

  • Marine such as Bilge, showers, kitchen sinks and fuel pumps; for virtually silent running (Stelth) for submarines and other military shipping for their showers and kitchen sinks.

  • Automotive such as; electric motor driven engine cooling pumps, fuel pumps, (bowser pumps too?).
  • Aerospace for fuel pumps, sinks, toilets etc.

  • Aeronautical for fuel pumps, sinks, toilets etc.

  • Pumping of volatile liquids and fuels due to no cavitation.
  • Factories.

  • Steel mills.

  • Dam to city dam/creek to rural dwellings/buildings.
  • Power stations.

  • High rises.

  • Municipal water mains.

  • Sewerage pumps.
  • Dishwashers.

  • Washing machines.

  • Using very high RPM motors, a single stage Stelth replaces 4 or more stage conventional pumps. Conventional pumps cannot run at Stelth higher RPM’s.
  • Pools.

  • Spas.

  • Solar pumping for agriculture with and without batteries.
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Further validation by independent institutions.

We took the Stelth Bilge pump and the Stelth automotive engine cooling pump to ITT, now named Xylem, the world’s largest pump manufacturer. We also took the EWP 115 Automotive engine cooling pump made by Davies Craig so ITT could test back to back.

Fig 12, at right, is the ITT ( now Xylem) test of the Stelth and the EWP 115. EWP means Electric Water Pump.

We are almost embarrassed by the mere 21.66% efficiency increase of the Stelth over the EWP115 but back then we were still learning.

However, this was a very early Stelth without the latest novel geometric innovations  installed. Now refer to the charts of Fig 10 and Fig 11 concerning recent performance % increases incorporating those novel geometric innovations.

In 2018 we will create our new Automotive engine cooling pump incorporating recent geometric innovations into the Stelth pump as reflected in Fig 10 and Fig 11. Please enquire how we are going with this.

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Independent Testing

Fig 13 above. Back then the Stelth bilge pump was half the height. later Stelth bilge pumps are even more squat, more efficient with higher flow and pressure. They fit under boat motors even better.

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Fig 14, at left. Test chart produced by ITT in their own test rig in Gloucester Massachusetts.

A NOVEL AUSTRALIAN, HIGH EFFICIENCY, HIGH RPM ELECTRIC MOTOR HAS BEEN DEVELOPED WITH HELP OF UNIVERSITY OF ADELAIDE (UA).

The Stelth bilge pump was 40.38 % more efficient than the world’s largest selling (ITT) bilge pump. Higher efficiency  means lives saved at sea.

Since then we have even higher efficiency due to the, above mentioned innovations.

The new motor owners want to launched it powering a “product”.

THE STELTH PUMP WAS CHOSEN AS THAT POTENTIAL PRODUCT AND A PUMP TESTING RIG WAS CONSTRUCTED AT UNIVERSITY OF ADELAIDE.

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Fig 15 above. The pump test rig constructed at University of Adelaide (UA).

Below are results obtained by University of Adelaide for the Davies Craig automotive engine cooling pump and the Stelth auto pump.

Independent Testing

Fig 16 at left. 2000 RPM is a reasonable conventional speed for each pump.

The Davies Craig automotive engine cooling pump (the EWP 115) showed predictable performance up until 3000 RPM. But 3500 RPM was simply too much for it and the curves for it in the chart of Fig 17 below published by UA are a meaningless scribble.

The UA test rig has automated data collection. When a pump flow and pressure become erratic, due to incapacity to continue pumping when at too high RPM, the data collected cannot be trusted.

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Fig 17, at right, the curves, especially the efficiency curves bottom right for 3,500 RPM, demonstrate that many conventional pumps cannot run at the higher RPM that the Stelth Pump can.

So, independent University testing at high pump speeds proved the large advantages of high speed for Stelth Pumps.

Independent Testing
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The other very important step for us with the UA testing was that now we could have tested, for the first time, the true hydraulic performance of the Stelth “wet end”. Before that all tests were with induction motors that were usually the same motor we cannibalised off the pump we were testing against. That was very useful but otherwise with different, but same rating motors you could not be totally sure if it was the motor or the pump that was better.

The charts of Fig 16 and Fig 17 proved that the Stelth was capable of high efficiency over a very broad speed and load range. It also proved that the Stelth efficiency increases with increasing RPM. These advantages are not possible for conventional pumps e.g. the Davies Craig pump collapses with high RPM as do all conventional pumps.

Fig 18, below, is also from University of Adelaide tests.

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Independent Testing

Fig 19, at left. Green dots show where the BEP, pressure, flow and motor Kw of Fig 18 above, compare on the chart from the Dayuan multi-stage pump brochure.

  • Stelth pumps at University of Adelaide have run to 7000 RPM. No data was collected at 7000RPM. The pressure at 7000 RPM would have been 618.9 kPA This is from a 93mm dia impeller! It would push 200 litres a minute vertically more than 207 feet.

  • The single-stage Stelth pressure and flow are better than a 7 to 10-stage Dayuan vertical bore pump and with higher efficiency. Remember that that was the “old” Stelth technology.

  • THE UNIVERSITY TESTING IS HOW WE LEARNED WE POTENTIALLY HAD A SINGLE-STAGE REPLACEMENT FOR MANY MULTI-STAGE PUMPS!

  • These results at left are what the Stelth pump has already achieved. They are not projections!

BELOW ARE CHARTS FROM UNIVERSITY OF ADELAIDE TESTS PERFORMED WITH THE STELTH WITH A 77MM (3 INCH) DIAMETER IMPELLER. IT COULD LIFT WATER VERTICALLY OVER 30 METRES (OVER 107 FEET).

Fig 20 at right, charts generated by the University of Adelaide. This Stelth prototype also had a too small inlet and outlet.

Fig 18 and Fig 20 charts are for the old Stelth. Now efficiencies are higher and the RPM can be increased. Look at Fig 10 and Fig 11 again to see the possible percentage increases in performance that might be available now if incorporating the novel additions. It could, way back then, push water vertically more than 107 feet.

These initial University tests showed us that in the Stelth pump we had a single-stage replacement for many multi-stage pumps. Note;  the Stelthneeds a high RPM motor to be able to replace many stages with one stage. All other centrifugal pumps cannot do this!

Independent Testing
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The Stelth as a pool filtration pump

The Stelth pool pump, with leaf bowl, has achieved above 67 “litres per watt hour”, being the nomenclature for “energy efficiency”, tested in the NFT test rig, QUALIFYING IT FOR 10-STARS, according the Australian standard AS5102 if it becomes a manufactured pump.

This was a prototype using a new Australian developed amorphous motor. In fact, the achievement preceded any of the pool pump manufacturers.

Recently, we had tested at CalTest in South Australia, the same Stelth 400-watt pump as is shown in the chart of Fig 11, above and an 1850 watt Stelth pump. The latter is not a pool pump.

Work will continue into 2018 to forge this into a manufacturable pool pump and motor combination with highest “energy efficiency”.

This was for our further learning.

The CalTest test rig is constructed according to the example in Australian Standard AS502 for pool pump testing. After adjusting for some differences between test rigs we can confirm that the results we obtain in the NFT test rig are accurate. For example, the results in Fig 10 and Fig 11 above, are correct.

Independent Testing

Fig 21, at left. the NFT test rig. This allows for testing of NPSH*, or for simulation of lift capability, therefore reality.

  • NFT test rig can have the suction side valve partially closed, imposing a negative pressure at the pump inlet, simulating reality conditions where a pool pump has to lift water.

  • Pool pumps, due to height above water, bends and long pipes, generate a suction side negative pressure of – 8 kPA to – 10 kPA with any pump!…Important!

  • Net Positive Suction Head (NPSH) indicates a pumps resistance to cavitation due to poor vertical lifting. The NFT test rig can test a pump’s ability to vertically lift water. The AS5102 test rig cannot.

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Fig 22, at left. the AS5102 test rig in which the pump is always below water.

NPSH cannot be tested; meaning the pump’s vertical lifting ability is never challenged.

The latest performance, due to introduction of the novel additional features demonstrated in the charts of Fig 10 and Fig 11, has been shown to be correct by adjustment of the different layout of the ASS5102 test rig and the NFT test rig.

Pump literate engineers know the way to do the adjustment. Most people cannot, so we plan to take the latest pumps to a reputable testing lab, maybe CSIRO, in early 2018 so the pumps can be tested in a test rig that conforms to International testing standards.

WE ARE MAKING BOLD AND CHALLENGING ASSERTIONS ON THIS WEBSITE AND SO WE WANT EVERYONE TO KNOW WE ARE DOING OUR HOMEWORK AND NOT GUESSING OR USING FAULTY TESTING TECHNIQUES.

Following is a test report from University of Adelaide.

In the following report, the term “AMM based motor” refers to the high RPM novel amorphous iron motor, the world’s highest efficiency electric motor.

However, the whole report is about the Stelth pump “wet end” results from the University of Adelaide test rig which was purposely built to test the Stelth Pump to be able to match it to the new AMM motor. The conventional motors were removed from the Stelth pump and a high speed, University lab motor and Torque transducer were used to find the characteristics, including the efficiency, of the Stelth “wet end” alone, apart from any motor. The AMM motor was not used for this testing.

Note the reference to “net positive suction head” (NPSH) in the below UA report.  Pumps 2 and 3 are obviously the 2 Stelth pumps. Pump 1 was the Davies Craig EWP 115 automotive engine cooling pump wet end without its motor.

Independent Testing
Independent Testing

Recent tests on a later, improved Stelth Pump with a 77mm (3 inch) diameter impeller are at least 12% higher efficiency than those in the University report at left.

AS SHOWN;  NFT HAS PERIODICALLY HAD STELTH PUMPS TESTED INDEPENDENTLY FOR OUR LEARNING AND ALSO FOR OUR JUSTIFICATION AND INSPIRATION TO CONTINUE OUR CHALLENGING AND EXCITING DEVELOPMENT WORK, HELPING US TO FOCUS AND RE-FOCUS ON THE BEST ENVIRONMENTAL AND INDUSTRY TARGETS.

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