BS ISO 9912-4:2018
$142.49
Agricultural irrigation equipment. Filters for microirrigation – Granulated media filters
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 24 |
This document specifies construction requirements and test methods for pressurized granulated media filters, hereinafter referred to as media filters, intended for operation in agricultural irrigation systems.
It is applicable to both manual cleaning media filters and automatic self-cleaning media filters, used as single unit or in batteries (two or more units working in parallel).
This document covers the operation and performance of a media filter, together with all related valves, back flushing mechanism, underdrains, manifolds and other related accessories necessary for the operation of the filter.
This document is applicable to three configurations of a filter.
-
An empty filter vessel (tank) housing.
-
A filter vessel filled with media filter material(s), complete with valves, connections, air release and/or other accessories. This configuration, when connected to and controlled by a flushing control device, is a complete operating single filter unit, usually positioned as a part of a filtration station.
-
A filtration station, called “filter battery”.
Annex A provides information on types of irrigation media filters.
Annex B provides information on granulated media.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Design and construction requirements 4.1 General |
| 11 | 4.2 Inlet and expansion space chamber 4.3 Media chamber 4.4 Collection (underdrain) and back flushing unit 4.5 Prefiltration element |
| 12 | 4.6 Back flushing control 4.6.1 Mandatory requirements 4.6.2 Optional features 5 Resistance of the filter to internal hydrostatic pressure 5.1 General |
| 13 | 5.2 Preparation 5.3 Static pressure test 5.4 Cyclic pressure test |
| 14 | 5.5 Collection (underdrain) and back flushing unit resistance to buckling or tearing |
| 15 | 6 Clean pressure drop test 6.1 General 6.2 Flow rates and test sequence 6.3 Filter media 6.4 Prescreening 6.5 Inlet and outlet pressures 6.6 Test duration |
| 16 | 6.7 Report 7 Back flushing tests 7.1 Back flushing parameters 7.2 Media escape test |
| 17 | 8 Automatic back flushing and controller 8.1 Back flushing initiation 8.2 Flushing control mechanism test 8.2.1 Mechanism activated by pressure drop 8.2.2 Mechanism activated by duration of operation 8.2.3 Mechanism activated by volume of filtered water |
| 18 | 8.2.4 Mechanism activated by another physical quantity 8.3 Operation of the protective device 9 Information to be supplied by the manufacturer 9.1 General 9.2 Filter data |
| 19 | 9.3 Back flushing controller |
| 20 | Annex A (informative) Types of irrigation media filters |
| 21 | Annex B (informative) Granulated media |
