ISO 12809 pdf free download

ISO 12809-2020 pdf free download.Crop protection equipment – Reciprocating positive displacement pumps and centrifugal pumps一Test method.
7.2.2 Installation of pump
The pump shall be fixed on the test bench as indicated by the pump manufacturer, especially those concerning the positioning of the pump and the dimension of the fixing device.
The pump shall be connected to the test bench by non-collapsible pipelines, both at the suction and delivery side.
The internal diameter of the suction line shall be as follows:
— for hoses, equal to or greater than (max. +5 %) the internal diameter indicated by the pump manufacturer;
— for fittings, equal to or greater than (max. +5 %) the internal diameter indicated by the pump manufacturer.
The internal diameter of the delivery line shall be equal to or greater than (max. +50 %) that indicated by the pump manufacturer.
7.2.3 Reference suction pressure
The reference suction pressure value shall be (—25 ± 2) kPa.
The suction pressure valve setting shall be set once at the beginning of the test by means of suction pressure adjustment valve (key 6 in Figure 1 or key S in Figure 2) at the maximum rotating speed indicated by the pump manufacturer and with the delivery pressure set to (5 ± 1) % of the rated pressure.
7.2.4 Flow-rate at the reference suction pressure
7.2.4.1 Test conditions
For self-priming pump, ensure that extra circuit valves (key 14 and 15 in Figure 1) are closed.
Set the reference suction pressure as defined in 22.3.
For the adjustment of the delivery pressure, use a valve indicated as key 12 in Figure 1 or key 10 in
Figure 2.
Before each setting, ensure that the pump is correctly primed.
The tests shall be performed setting the delivery pressure to have the maximum and minimum pressures indicated by the pump manufacturer and at least two other values equally spaced in the range. In every case, the test shall be performed at the maximum and minimum rotating speeds of the pump, as indicated by the pump manufacturer, and at least at two other values equally spaced in the range.
lithe pump has variable volume, perform the test at the maximum and minimum volumes, as indicated by the pump manufacturer, and at least at two other values equally spaced in the range.
For each combination of the above parameters, measure the flow-rate.
7.2.4.2 Results
Report the results of the tests in a chart or graph (for examples, see A1J. or Aid).
7.2.5 Flow-rate at variable suction pressure
7.2.5.1 Test conditions
For self-priming pump, ensure that extra circuit valves (key 14 and 15 in Figure 1) are closed.
The tests shall be performed with the delivery pressure set to (10 ± 1) % of the rated pressure, or at least (100 ± 10) kPa, and at the maximum rotating speed, as indicated by the pump manufacturer. Start with the suction pressure set to the minimum of:
— the minimum negative value indicated by the pump manufacturer;
— (—60±2)kPa.
Repeat the test at increasing suction pressures in steps of (10 ± 2) kPa up to (—10 ± 2) kPa.
Measure the flow-rate for each suction pressure.
7.2.5.2 Results
Report the results of the tests in a chart or graph (for an example, see A.1.2).
7.2.6 Power consumption
7.2.6.1 Test conditions
The test conditions shall be as specified in 7.2.5.1 and the power consumption is calculated as indicated in 6.6.
7.2.6.2 Results
Report the results of the tests in a chart or graph (for examples, see ALL.3 or Ai2).ISO 12809 pdf download.