Hydraulic Testing

Fluid power systems play a critical role in many industries, and are one of the three major forms of power transmission along with electrical and mechanical power systems. In many cases, however, mechanical and electrical methods cannot provide a practical power transmission solution. In these cases, fluid power (whether hydraulic or pneumatic) is often used because it can deliver linear and rotary motion with high force and torque within a smaller, lighter package than is possible with other forms of power transmission. Some of the most common applications of hydraulic systems are in heavy construction and off-highway equipment. Other applications can be seen in aircraft, mass transportation systems (such as trains), construction, mining, agriculture, waste reduction, and utility equipment. The various components (such as valves, actuators, cylinders, accumulators, etc.) that make up these systems must perform reliably and have a reasonable life span. Only a thorough test program carried out under simulated field use conditions can insure that any component part or assembly will meet its original design goals for performance, reliability and longevity. Many internationally recognized organizations have published test standards that apply to hydraulic/pneumatic and fluid power systems and components. Some of these organizations are:

  • American National Standards Institute (ANSI)
  • International Organization for Standardization (ISO)
  • Radio Technical Commision for Aeronautics (RTCA)
  • Society of Automotive Engineers (SAE)

Testing for hydraulic equipment is usually performed with the help of complex test systems or Test Stands. The test stand acts as a fluid supply source and can be adjusted to supply the required fluid at the flows, pressures, and temperatures necessary for the test. Testing may also be accomplished inside a temperature test chamber in order to control the ambient temperature surrounding the test article. In some cases, multiple environments can be combined such as temperature, humidity, pressure (altitude), and icing. Test durations may run into hundreds or even thousands of hours depending on the requirements for the unit under test (UUT). During the entire test period, test system integrity and safety must be maintained while collecting all of the necessary data necessary to validate the test results.

Test Cabapilities / Types

Capabilities listed are for reference, there are many variables to consider. Please send a request for quotation with details about your equipment and test requirement specifics for a detailed evaluation.

  • Burst and Proof Pressure Testing to 60,000 psi
  • Continuous Flow
  • Cracking and Reseat Pressure Testing to 8,000 psi
  • Endurance Testing to 6,000 psi Hydrocarbon (red oil) and 7,500 psi Phosphate Ester (Skydrol)
  • Flow/Pressure Drop Testing
  • Functional Testing
  • Hydrostatic Pressure - Capability - Hydrocarbon (red oil)/water to 60,000 psig or Phosphate Ester (Skydrol)/water to 75,000 psig
  • Impulse Testing to 9,500 psi Hydrocarbon (red oil) and 7,500 psi Phosphate Ester (Skydrol)
  • Cold Start to 3,000 psi at 5 gpm
  • Leakage Testing
  • Pressure Cycling
  • Performance Verification
  • Fluid Immersion and Susceptibility
  • High and Low Temperature Testing, fluid and/or environment
  • Combined environments, i.e. Hydraulic and temperature, Humidity, and vibration
    • Vibration - pressures to 4,000 psi at 8 gpm Hydrocarbon (red oil), or 3,000 at 12 gpm Phosphate Ester (Skydrol)
    • Temperature - 4,000 psi at 8 gpm Hydrocarbon (red oil), or 5,500 psi at 20 gmp Phosphate Ester (Skydrol)
  • High Speed Data Acquisition and Control using LabView Software and National Instruments Hardware
  • Custom Engineered Testing

Reference Standards Tested To:

  • ANSI T3.21.3
  • ANSI T3.5.28
  • ISO 10770
  • ISO 6404
  • ISO 6605
  • MIL-F-8815
  • RTCA DO160
  • SAE ARP-490
  • SAE ARP 4387
  • SAE ARP 4946
  • SAE ARP 1383
  • SAE ARP-24
  • SAE ARP-1383
  • NFTA T2.12.11
  • USCAR 24

Phosphate Ester (Skydrol) Capability:

  • 200 HP test stand capable of 8,500 psig and 40 GPM and 300°F
  • 125 HP test stand capable of 6,000 psig and 125 GPM
  • Low flow mobile test stand for combined environments
  • 75,000 psig Hydrostatic Capability

Products tested include valves, actuators, accumulators, pumps and motors, heat exchangers, hoses, filters, tubing and fittings. NTS performs hydraulic testing at a number of facilities including Fullerton, CA; Boxborough, MA and Orlando, FL.