BS ISO 12809:2011 pdf download
BS ISO 12809:2011 pdf download.Crop protection equipment—Reciprocating positive displacement pumps and centrifugal pumps -Test methods.
Use the test liquid specified in Clause 5.
7.2 Flow rate at the reference suction pressure
7.2.1 T.st conditions
Ensure that valves 11, 12 and 13, as indicated in Figure 1. are closed.
Set the reference suction pressure as defined in 6,4.2 by means of vaNe 4. as mdicated in Figure 1.
Use valve B. as Indicated In Figure 1. for the adjustment of the delivery pressure.
Before each setting, ensure that the pump is correctly primed.
The tests shall be performed setting the delivery pressure so as to have the maximum and minimum pressures indicated by the 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 manufacturer. and at least at two other values equally spaced in the range.
If the pump has variable volume, perform the test at the maximum and minimum volumes, as indicated by the manufacturer, and at least at two other values equally spaced in the range.
For each combination of the above parameters, measure the flow rate.
72.2 Results
Report the results of these tests In a chart or graph (for an example, see Al).
7.3 Flow rate at variable suction pressure
7.3.1 Test conditions
Ensure that valves 11, 12 and 13, as indicated in Figure 1, are closed.
The tests shall be performed with the delivery pressure set to (10 ‘ 1) % of the rated pressure, wnlch snaii De at least (100 ± 10) kPa. and at the maximum rotating speed, as indicated by the manufacturer.
Start with the suction pressure set to (-60 ±2) kPa and repeat the test at Increasing suction pressures ii steps ot(10 ± 2) kPa up to (—10±2) kPa.
Measure the flow rate for each suction pressure.
7.3.2 Results
Report the results of these tests in a chart or graph (for an example, see A.2).
7.4 Power consumption
7.4.1 Test conditions
The test conditions shall be as specified in 7.2.1.
7.4.2 Results
Report the results of these tests in a chart or graph (for an example, see A.3).
7.5 Priming capacIty — Normal flow
7.5.1 Test condItions
The test shall be performed under the following conditions:
— at the maximum rotating speed, as indicated by the manufacturer;
— with the delivery pressure set to (5 ± 1) % of the rated pressure and to at least (100 10) kPa:
— with the suction pressure set to the reference suction pressure defined in 64,2;
— with lengths of suction line equal to (3 ±0.1) m. (5 ± 0.1) m and (7 ± 0.1) m. and with the suction line in the horizontal position.
During the test, record the value of the delivery pressure at intervals not greater than 0,5 s.
7.5.2 Test procedure
Ensure that valves 11, 12 and 13. and air inlet valve 3, as indicated in Figure 1, are closed.
Start the pump, wait until it is correctly primed and adjust to reach the specified conditions (suction pressure, delivery pressure, rotation speed). Open the air inlet valve for (30 ± 1) s. Shut off the air inlet valve and simultaneously start the pressure recording. Stop the test wiien the delivery pressure reaches the set value (± 5 %) and remains at that level for at least 5 s.
Determine the time passed between the closure of the air inlet valve and the achievement of the set pressure. For each length of suction line, repeat the test three times.
7.5.3 Results
Report the three values of time measured and their mean value for each test, in seconds (s).
7.6 Priming capacity — Re-circulation circuit
7.6.1 Test conditions
The test shall be performed under the following conditions:
— at the maximum rotating speed, as indicated by the manufacturer:
— with the delivery pressure set to (10± 1) % of rated pressure and to at least (100 + 10 kPa);
— with the suction pressure set to the reference suction pressure defined in 6.4,2;
— with lengths of suction line equal to (3 ± 0,1) m, (5±0,1) m and (7 ± 0,1) m. and with the suction line in the horizontal position;
— with the length of the by-pass line set to (1 ± 0.1) m, with the same diameter as the suction line and with me length of the by-pass line measured from the centre of valves 12 anil 13. as Indicated In Figure 1:
— with the output flow rate set to 10%, 15 % and 20% (t 1 dm3’min 1) of the maximum volume delivered per minute declared by the manufacturer.
During the test, record the value of the delivery pressure at intervals not greater than 0.5 a.
7.62 Test procedure
Ensure that air inlet valve 3. as Indicated in Figure 1, is closed.
