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…