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The portable power unit can be used as a pressure testing machine suitable for testing hydraulic hoses, in general, as well as hydraulic cylinders, and can be used as a source of portable power in the event of hydraulic machinery breakdowns.

The unit has a tank capa- city of 150 ℓ, a 7,5-kW motor, as well as a hydraulic pump giving a pressure of 250 bar. It has a built-in double-acting hand-operated value, two hydraulic gauges and a pressure relief valve, and weighs 165 kg inclusive of oil.

The unit has four wheels and two half-inch hydraulic hoses of 2 m in length, which will connect to any hydraulic hose that needs to be tested.

The portable power unit has no electronic or electric devices that could cause a breakdown if used by unskilled labour, and is suitable for use in any hydraulics- related industry, including mining operations.

Further, Genflex has confirmed its support of the stand- ard of hydraulic hose and fitt- ing assemblies, known as NCB 157.

 “During the 1960s, the British National Coal Board introduced a standard for hydraulic hose and fitting assemblies, known as NCB 157. “Genflex believes that this standard has stood the test of time, and with over 50 years of experience behind this system, we have not found any improvement to this standard of assembly,” says Genflex director David Michelle.

NCB 157 states that the hydraulic hose has to be cut squarely, while the outer cover where the fitting is to sit on the hydraulic hose must be removed.

The insert of the fitting must be assembled to the hose by using soapy water, and not grease or oil, since grease or oil would not only shorten the lifespan of the hose, but would also cause damage to the compounds of the hose assemblies, owing to the hydraulic hose having oils in its own rubber compound.

Each fitting would then be inserted into the swage machine and crushed or swaged onto the hose.

 “It is crucial that the inner portion of the fitting must collapse by between 5% to 10% to be satisfactorily and safely attached to the hose. “Go-No-Go gauges are then inserted into the fitting, and the gauge is turned around and inserted into the fitting again. “These Go-No-Go gauges are the only way of guaranteeing that the fitting was safely attached to the hydraulic hose,” he says.

He adds that the basic principle in the manufacture of hydraulic hose assemblies is that when the fitting has been attached to the hose, the larger size of the Go-No-Go gauge should not be able to pass through the fitting, yet the smaller side, which is less than 10%, should easily pass through the fitting.

 “Only at that point are the fitting and hose unified, and the end fittings will not move or separate from the hose,” Michelle says.The news come from http://www.bossgoo.com/