ISO 4409:2019 pdf free.Hydraulic fluid power – Positive-displacement pumps, motors and
integral transmissions – Methods of testing and presenting basic steady state performance.
5 Tests
5.1 Requirements
5.1.1 General
Installations shall be designed to prevent air entrainment during operation and measures shall be taken to remove all free air from the system before testing.
The unit under test shall be installed and operated in the test circuit in accordance with the manufacturer’s instructions; see also Annex B.
The ambient temperature of the test area shall be recorded.
A filter shall be installed in the test circuit to provide the fluid-cleanliness level specified by the manufacturer of the unit under test. The position, number and specific description of each filter used in the test circuit shall be recorded.
Where pressure measurements are made within the piping, the requirements of ISO 9110-1 and ISO 9110-2 shall be met.
Where flow measurements are made, the requirements of ISO 11631 shall be met.
Where temperature measurements are made within the piping, the temperature tapping point shall be positioned between two and four times the internal diameter of the piping from the pressure-tapping point furthest away from the component.
Figures 1. 2. 3 and 4 illustrate basic circuits that do not incorporate all the safety devices necessary to protect against damage in the event of any component fracture or fragmentation. It is important that those responsible for carrying out the test give due consideration to safeguarding both personnel and equipment. NOTE A ‘run inH procedure before testing can have a positive effect on the test results.
5.1.2 Installation of the unit under test
The unit to be tested in the circuit shall be in accordance with the applicable Figure 1, 2., 3 or 4.
5.1.3 Test fluids
The properties of hydraulic fluids affect pump and motor performance. Any fluid can be used for the test, if agreed between the parties concerned, but its characteristics shall be clearly defined, according to the properties listed in Table 2. In order to compare two components, the same fluid shall be used.
5.1.4 Temperatures
5.1.4.1 Controlled temperature
Tests shall be carried out at a stated test fluid temperature. The test-fluid temperature shall be measured at the inlet port of the unit under test and be within the range recommended by the manufacturer. It is recommended that measurements are made at two temperature levels, 50 °C and 80 °C. The test fluid temperature shall be maintained within the limits stated in Table 3.
5.1.4.2
Other temperatures The fluid temperature may be measured at the following locations:
a) at the outlet port of the unit under test; b) at the flow measurement point in the test circuit;
c] in the drainage fluid line (if applicable). For an integral transmission, it might not be possible to measure all the temperatures required. Temperatures not recorded shall be noted in the test report.
5.1.5 Casing pressure If the fluid pressure within the casing of the component under test can affect its performance, the fluid-pressure value in the case shall be maintained and shall be recorded.
5.1.6 Steady-state conditions Each set of readings taken for a controlled value of a selected parameter shall be recorded only where the indicated value of the controlled parameter is within the limits shown in Table 4. If multiple readings of a variable are recorded the mean values shall be documented while the controlled parameter is within the operating limits. The maximum suggested time period to acquire each reading is 10 S at a minimum data acquisition rate of 1 000 Hz. Such readings should include zero displacement and idle operating conditions. Test parameters are considered stabilized when they are within Table 4 limits. ISO 4409 pdf download.