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over 200m up a drain, as far as some much larger tanker units.
Last, but definitely not least, is your choice of cleaning nozzle. There is little point fine tuning the jetter design and selecting the correct hose combination if the nozzle at the end is worn out or inefficient. A drilled nozzle with a low efficiency rating means that the water passing through it wastes a lot of the pump energy before it even leaves the jet insert.
Why does this happen? The holes are drilled directly into the jet body and as a result they can be quite rough and ragged and these rough surfaces slow down the water as it blasts out into the drain. If it’s slowed down even before it leaves the jet insert, it will have much less energy by the time it hits the side of the drain and much less ability to blast it clean.
High efficiency drain jets are manufactured with smooth inside surfaces and the jet holes are formed in ceramic or other similarly hard materials. These hard wearing inserts allow the water to pass through at very high speed, hitting the side of the drain with maximum impact.
Once again, if we use the 3000 psi jetter from the previous example and we fit either a drilled drain jet or a high efficiency drain jet, the effect is dramatic. The drilled drain jet is about 60% efficient, meaning the water passing through it will be travelling out of each hole at around 240 mph. Use the same jetter to power a high efficiency drain jet with ceramic inserts that are 90% efficient and the water passing through this jet will be travelling at just over 400 mph!
Thanks to the laws of physics this extra speed packs nearly 3 times more cleaning energy into the water leaving the high efficiency jet and once again that means longer drain runs can be cleaned quicker to a higher standard.
Flowplant 315 Series jetting van pack
Ditch the 3/8” bore hose in favour of ½” bore, remove the mini jet kit and the nozzle pressure will leap to over 170 bar (2450 psi). That’s nearly a 400% increase in cleaning power just by changing hoses.
You are also relying on the pressure at the nozzle to generate “thrust”, the force that pulls the hose up the drain. Back pressure can destroy thrust leaving not enough pressure at the nozzle to generate anything more than the most limited amount of pull, so the hose stays sitting in the drain going nowhere fast. In the previous example, thrust increases from a lowly 5 kgs to almost 13 kgs just by changing the hoses.
It is also worth considering upgrading from old style rubber hose to lighter, tougher versions with hard wearing outer surfaces and smoother inner bores. They may be more costly to buy but they can last longer and pull farther, making them an option worth trying out, particularly as hose re- ending has been prohibited in the latest British Standard. Lightweight hoses on a well-designed van pack with an effective Jump Jet system can travel
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You may say that drilled drain jets are good enough for your work. They do the job so why bother changing? Well, if you switch to a higher efficiency jet, you’ll be able to do the same job at a lower pressure and use less water. That means less tank fills, less fuel cost, less noise and less wear and tear on your machine. All with no reduction in productivity!
At the end of the day, there is no substitute for pump power and, if you have a tough blockage many metres from your nearest entry point, it will always be comforting to have a full sized van pack on the job. However, by carefully selecting your jetter, matching it to the best jetting hoses and using the highest efficiency drain nozzles, it is possible to maximise efficiency and maintain a good level of productivity, even with a smaller machine.
| September 2015 | drain TRADER 11
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