Genesis Rescue Systems has introduced a new “Single Line Coaxial” hydraulic hose. As with the other “Single Line” rescue tool hose on the market, it is a hose within a hose; it hides the pressure line inside the return line, and gets high marks for being “cool”.
The flow diagram below shows how the hydraulic fluid from the pressure line travels down the inside hose (in red) toward the tool. The return line hydraulic fluid (in yellow) travels back to the pump through the outer chamber of the hose.
The below picture shows the seamless installation of a Genesis OSC (One Step Coaxial) male coupler on the Genesis “Single Line Coaxial” hydraulic hose, along with the new style OSC dust cap.
Inside diameter of the pressure line in the Genesis “Single Line Coaxial” hose is 5mm (compared to 4mm on the competing product), which will help the Genesis pump flow more hydraulic fluid. It is the same principal as 1 3/4″ attack line fire hose flowing significantly more water than 1 1/2″. For reference, Genesis’ regular “twin line” hydraulic hose has a diameter of approximately 6 1/2 mm, so is even better…
Maximum operating pressure of Genesis’ outer / return line hose is 510 psi (compared to 363 psi on the competing product), with a 4:1 safety factor. Based upon this data, the Genesis “Single Line Coaxial” hydraulic hose product “should” be a noticeable improvement over the competing product…especially since Genesis’ hose comes with the more durable and non-proprietary OSC coupler.
Rescue personnel willing to overlook the service issues on “Single Line” hoses and wanting the “coolest” hydraulic rescue tool hose available will love the new Genesis “Single Line” hose!
Does the new Genesis Single Line hose extend out the same as the Core? I would assume it’s probably slightly stiffer? yes or no?
Genesis Single Line Coaxial hose plays out very similar to Holmatro Core hose. Genesis Single Line Coaxial hose is a little stiffer, but the slight amount of additional stiffness in the Genesis product helps it kink less than Holmatro’s Core product. Both are light weight, due to the synthetic and Kevlar materials used in their production, and lack of heavy-duty steel braiding.
Remember that with both Core and Single Line Coaxial hose, when the outer hose kinks – even if the outer hose does not show damage – the inner Kevlar hose does kink and will show damage…except that you cannot see the kink damage. Reason? The high pressure inner hose is concealed from view by the low pressure outer hose. This is the same on any coaxial hose – both Holmatro Core and Genesis Single Line Coaxial Hose.
There is a service issue on both Holmatro Core & Genesis Single Line Coaxial hoses. There is no way to simultaneously pressure test these hoses while inspecting the pressure line for “tell tale” of impending failure…so it is almost impossilble to get a warning that the hose is getting close to failure, until it actually fails. With regular twin-line hose, an observant service tech gets a warning of impending failure (“seepage” around crimp fittings, swelling of crimp fittings, or badly kinked hose). You do not get this warning with either Core or Single Line hose.
Holmatro likes to say in their advertisements that Core hose is safer than twin-line hose. But if pressure line damage cannot be inspected by a service technician because it is hidden from view, how does that make it safer? Not being able to see a potential problem because it is covered just hides the problem – it does not make it go away.
Users of coaxial hoses (Genesis Single Line Coaxial and Holmatro Core) would be wise to set an arbitrary date…maybe 10 Years, and replace their rescue tool hydraulic hose automatically at that point, whether the hose is still passing pressure test or not.