Hydraulic systems & components


Bladder accumulator recertification by HFT

Second Quarter 2020 Hydraulic systems & components

As part of its accumulator service package, Hytec Fluid Technology (HFT) conducts legal parameter conformance testing on bladder accumulators. The offering proves accumulator conformance to PER and SANS 347 standards. HFT tests and recertifies 1 – 50 litre-capacity Bosch Rexroth, Olaer and Hydac bladder accumulators. Other bladder accumulator brands, if accompanied by design drawings and parameter specifications, are also tested at the company’s accumulation certification centre in Spartan, Johannesburg.

To test accumulator vessel expansion, vessels are subjected to a hydrostatic pressure test to 1,25 times the vessel’s working pressure – overseen by the Authorised Inspection Authority. Certified accumulators conform to the OHS Act (PER and SANS 347) with accumulators classified ‘Industrial & Factory’ certified for 36 months and those classified ‘Mine Health & Safety’ certified for 24 months.

“Testing accuracy on all parameters of reference is done to six decimal points,” says HFT workshop foreman, Tony Greef. “This allows for extremely accurate parameters to reflect, and the most on-point certificate to be issued.” Vessel wall thickness is verified using a five-point ultrasonic thickness test. In addition to recertification, the accumulator service includes accumulator stripping; double cleaning; and reassembly with a new bladder, seal kit and anti-extrusion ring. Protective paint forms part of vessel refurbishment and recertification.

Three accumulator units can be bench-mounted, harnessed and tested simultaneously, facilitating an approximately 60 minute testing turnaround per vessel. All test work is carried out on the HFT on-site accumulator test bench, an R800 000 investment developed by Tectra Automation.


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