BS ISO 9912-4:2018

1   Scope 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.

a) An empty filter vessel (tank) housing.

b) 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.

c) A filtration station, called “filter battery”.

Annex A provides information on types of irrigation media filters . Annex ...