BS ISO 18471:2015 pdf free.Agricultural irrigation equipment 一 Filters 一 Verification of filtration grade.
BS ISO 18471 specifies a test method for the verification of filtration grade of filters intended for operation in agricultural irrigation systems. It is intended to be used for verifying the filter manufacturer’s declaration about the filtration grade of a specific filter.
This test method uses a Clogging Capacity Meter (CCM) device to compare the filtration grade of the filter under test against the filtration grade of a test filtration screen.
NOTE This test method may also be used by a filter manufacturer to determine the filtration grade.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 9644, Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1 filtration grade number, declared by the manufacturer, that represents the size of water passages in a filter and is related to its ability to stop particles
Note 1 to entry: The filtration grade is expressed in micrometres (pm, microns).
3.2 clogging capacity meter CCM device used for measuring the time to reach a specified pressure loss across a standard filter screen, at
a constant flow rate
3.3 aperture width distance between two adjacent parallel wires in a square-mesh wire cloth screen plain-weave
3.4 mesh count number of apertures per unit of linear measure in a woven wire cloth or wire screen
ISOURCE: ISO 9045:1990, 3.2.81
4 Summary of the test method
Two CCM units, using identical test screens, are connected to the water mains, one upstream and one downstream of the filter under test.
Water at a flow rate of 10 1/mm is passed through each CCM screen and the time required for each CCM to reach a predetermined pressure loss (0,5 bar) across its own screen is recorded.
The ratio between the two time periods, measured at the downstream and the upstream CCM units, is calculated. A ratio equal to or greater than five indicates that the filtration grade declared by the manufacturer is correct.
5 CCM structure and operation
5.1 Construction
The CCM device consists of two main parts (see Figure 1).
5.1.1 Sampler (1)
The sampler is the part of the CCM through which water used for testing flows. It includes the following:
— screen housing (3), capable of being opened and closed for cleaning and for easy replacement of the filtering screen (4);
— flow rate regulator (5), accurate to ±2 %, limiting the flow rate to 10 1/mm.
5.1.2 Control unIt (2)
The control unit includes the following measuring instruments:
— pressure gauge (9) accurate to ±1 %, measuring up to 10 bar;
— differential pressure gauge, digital or analog (10) accurate to ±1 %;
— count up digital timer (6) with a resolution of 0,01 mm, preferably starting automatically when the pressure reaches a predetermined level;
— timer start switch (12);
— timer reset button (11), setting the timer back to zero;
— tubes (7 and 8) connecting the control unit to the sampler. Pressure tap construction shall be in accordance with ISO 9644.BS ISO 18471 pdf free download.
Tags: Agricultural irrigation
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