Hose and fittings tested to destruction

Fourth Quarter 2008 Hydraulic systems & components

According to Genflex director, David Michelle, there is no standard machine available that can test the force needed to rip a hydraulic hose from its fitting, with the hose portion still being retained inside the fitting, except the one manufactured by Genflex Hydraulics in Johannesburg.

Genflex has manufactured a hydraulic hose pressure testing machine, which they have incorporated into their Pressure Testing Laboratory. The machine allows them to test the strength of attachment between the hose and fitting, and the attachment of swivel nuts on hydraulic fittings.

Michelle described the results. “On testing two-braid hose assemblies from sizes ¾” to 1¼” we found that the wire braids become detached from the fittings at between 3 and 5 tonnes force. In all of these instances no portion of the hose which was trapped inside the fittings showed any sign of tear or movement. All of the fittings and swivel nuts remained in good working order and showed no sign of stress.”

Genflex repeated the pressure test on their SP Multi Spiral hoses and the following results were recorded:

* The ¾” hose ripped at the fitting at a force of 5,25 tonnes.

* The 1” multispiral hose ripped at a force of 8,5 tonnes.

* The 1¼” multispiral swivel nut was forced from its body at a force of 10 tonnes.

* A further 1¼” wire trapped design fitting with a solid nut was placed on the machine producing the following results: the hose was ripped from the fitting at a force of 15 tonnes. The swivel nuts remained in good order and the hose portion inside the fitting was intact.

“Although these tests are not specified by any SAE or DIN specifications, they do prove the compatibility of our Genflex brand of hose and fittings which we distribute throughout Africa,” said Michelle.

Genflex staff members involved in the testing process are exposed to the more technical aspects of hydraulic hose and fittings tests, giving them more confidence and greater knowledge of the Genflex brand of hoses. This helps them to more accurately assess the correct hoses for specific applications. Genflex has invested over R¼ million in its Pressure Testing Laboratory.

It is Genflex’ policy to continue to maintain standards and invest time and money in order to enhance the training of its staff which enables the Genflex group of companies continued growth.

The Genflex group includes Singlehurst in KwaZulu-Natal, Interlok in Port Elizabeth as well as Hydraulic Hose and Equipment in Mozambique.

For more information contact David Michelle, Genflex Hydraulics, +27 (0)11 900 3235, [email protected], www.genflex.co.za

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