ISO 9912-4:2018 PDF

Agricultural irrigation equipment — Filters for microirrigation — Part 4: Granulated media filters

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Title (English):

ISO 9912-4:2018

Agricultural irrigation equipment — Filters for microirrigation — Part 4: Granulated media filters

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 16
Publication date:: August 9, 2018
Edition:: ISO IS 9912 edition 1 version 1
ICS:: 65.060.35

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Description (English):

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 B provides information on granulated media.

Technical details

Technical committee: ISO/TC 23/SC 18 - Irrigation and drainage equipment and systems
SKU: ISO 9912-4:2018

Abstract

Overview

ISO 9912-4:2018 - Agricultural irrigation equipment - Filters for microirrigation - Part 4: Granulated media filters - specifies construction requirements and test methods for pressurized granulated media filters used in microirrigation systems. The standard applies to both manual cleaning and automatic self‑cleaning media filters, whether as a single unit or in a filter battery (two or more units in parallel). It covers the full filter assembly and related components: valves, back‑flushing mechanisms, underdrains, manifolds and accessories.

Key topics and technical requirements

Scope and configurations: applicable to (a) empty filter vessels, (b) vessels filled with media and accessories (complete single operating units when connected to a flushing control), and (c) filtration stations (filter batteries).
Design & construction: requirements for inlets, outlets, backflush outlets and command power sources; materials in contact with water must be non‑toxic, UV resistant (or opaque), and durable for intended conditions. Components of same model must be interchangeable.
Inlet and expansion chamber: must accommodate media expansion during backflushing - expansion volume ≥ one third of the media volume; covers, safety mechanisms and pressure relief provisions are required.
Media chamber & underdrain: declarations of media volume, surface area and depth; design of collection and backflush units to avoid media loss.
Backflushing control: mandatory and optional features for manual and automatic backflush systems; automatic initiation methods include pressure‑drop, operation duration, filtered volume, or other physical triggers.
Performance & test methods: static and cyclic hydrostatic pressure tests, underdrain buckling/tearing tests, clean pressure drop tests, backflushing parameter tests including media escape checks, and controller operation verification.
Manufacturer information: required data for the filter and controller to support installation, operation and maintenance.

Practical applications - who uses this standard

Filter manufacturers designing pressurized granulated media filters for microirrigation.
Irrigation system designers and OEMs specifying filtration stations and filter batteries.
Test laboratories and certification bodies conducting pressure, clean pressure drop and backflush tests.
Agricultural engineers, farm managers and contractors selecting filters to match water quality and operational needs.
Procurement and compliance teams ensuring equipment meets safety, interchangeability and performance claims.

Related standards

ISO 9912-1 - Terms, definitions and classification (microirrigation filters)
ISO 9912-2:2013 - Strainer-type filters and disc filters
ISO 9912-3 - Automatic flushing strainer-type and disc filters
ISO 9644 - Pressure losses in irrigation valves - Test method

Keywords: ISO 9912-4:2018, granulated media filters, microirrigation, pressurized media filters, backflushing, filter battery, underdrain, clean pressure drop, filter performance.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and configurations: applicable to (a) empty filter vessels, (b) vessels filled with media and accessories (complete single operating units when connected to a flushing control), and (c) filtration stations (filter batteries).
Design & construction: requirements for inlets, outlets, backflush outlets and command power sources; materials in contact with water must be non‑toxic, UV resistant (or opaque), and durable for intended conditions. Components of same model must be interchangeable.
Inlet and expansion chamber: must accommodate media expansion during backflushing - expansion volume ≥ one third of the media volume; covers, safety mechanisms and pressure relief provisions are required.
Media chamber & underdrain: declarations of media volume, surface area and depth; design of collection and backflush units to avoid media loss.
Backflushing control: mandatory and optional features for manual and automatic backflush systems; automatic initiation methods include pressure‑drop, operation duration, filtered volume, or other physical triggers.
Performance & test methods: static and cyclic hydrostatic pressure tests, underdrain buckling/tearing tests, clean pressure drop tests, backflushing parameter tests including media escape checks, and controller operation verification.
Manufacturer information: required data for the filter and controller to support installation, operation and maintenance.

Practical applications - who uses this standard

Filter manufacturers designing pressurized granulated media filters for microirrigation.
Irrigation system designers and OEMs specifying filtration stations and filter batteries.
Test laboratories and certification bodies conducting pressure, clean pressure drop and backflush tests.
Agricultural engineers, farm managers and contractors selecting filters to match water quality and operational needs.
Procurement and compliance teams ensuring equipment meets safety, interchangeability and performance claims.

Related standards

ISO 9912-1 - Terms, definitions and classification (microirrigation filters)
ISO 9912-2:2013 - Strainer-type filters and disc filters
ISO 9912-3 - Automatic flushing strainer-type and disc filters
ISO 9644 - Pressure losses in irrigation valves - Test method

Keywords: ISO 9912-4:2018, granulated media filters, microirrigation, pressurized media filters, backflushing, filter battery, underdrain, clean pressure drop, filter performance.

ISO 9912-4:2018 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

Agricultural irrigation equipment — Filters for microirrigation — Part 2: Strainer-type filters and disc filt…

Agricultural irrigation equipment. Filters for micro-irrigation - Terms, definitions and classification

Agricultural irrigation equipment — Filters — Part 3: Automatic self-cleaning strainer-type filters

Agricultural irrigation equipment — Pressure losses in irrigation valves — Test method — Amendment 1