ISO 12809-2020 pdf free

04-19-2021 comment

ISO 12809-2020 pdf free.Crop protection equipment — Reciprocating positive displacementpumps and centrifugal pumps —Testmethod.
This document specifies test methods and the environmental conditions for evaluating the performanceof reciprocating positive displacement pumps and centrifugal pumps designed for crop protectionequipment.
This document is applicable when defining the performance of stand-alone pumps or pumps that areinstalled on a sprayer.
Some of the tests indicated in this document are suited only for specific pump types.It is not applicable to pesticide metering pumps for injection systems.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments] applies.ISO 5681, Equipment for crop protection —Vocabulary
For the purposes of this document, the terms and definitions given in IS0 5681 and the following apply.The test bench shall have a main circuit containing the devices for flow control and pressureadjustment; see Figure 1 with the scheme of hydraulic circuit for self-priming pump or Figure 2 with thescheme of hydraulic circuit for non-self-priming centrifugal pump.To simulate the installation of positivedisplacement pump on the sprayer, the test bench shall have an extra circuit (key A in Figure 1) with partof the flow coming back directly to the suction line of the pump.The suction line connects the pump with the tank. It shall be fitted with an air inlet valve (key4 in Figure 1 or Figure 2), a suction pressure adjustment valve (key 6 in Figure 1 or key 5 in Figure 2)and a suction pressure gauge (key 7 in Figure 1 or key 6 in Figure 2).For self-priming pumps, the h valueshall be (400 100) mm(Figure 1). For non-self-priming pumps, the h value shall be (-400  100) mm(Figure 2). The inlet of the suction line shall be free, without non-return valves.The delivery line shall be fitted with a safety valve (key 9 in Figure 1) with appropriate rangeable to protect the test bench, a pressure gauge (key 10 in Figure 1 or key 8 in Figure 2), a device for flow-rate measurement (key 11 in Figure 1 or key 9 in Figure 2) and a pressure adjustment valve (key 12 inFigure 1 or key 10 in Figure 2). The output of the delivery line shall be connected to the tank in order toguarantee the re-circulation of the test liquid (key 13 in Figure 1 or key 11 in Figure 2).Ensure that theback flow does not create turbulence in the suction line.The extra circuit (key A in Figure 1) shall be fitted with a re-circulation adjustment valve (key14 in Figure 1) and a shut-off valve (key 15 in Figure 1) able to isolate this part of the circuit.The level of the liquid in the tank (key 2 in Figure 1 or Figure 2) shall be equal (±10 mm) to thetop of the pump housing at the beginning of the test. Set the level when all the lines are filled with thetest liquid.During the measurement, the level of the liquid in the suction tank shall not change by morethan 50 mm.ISO 12809 pdf download.

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