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

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.

Matériel agricole d'irrigation — Filtres pour micro-irrigation — Partie 4: Titre manque

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Publication Date
08-Aug-2018
Current Stage
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ISO 9912-4:2018 - Agricultural irrigation equipment -- Filters for microirrigation
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INTERNATIONAL ISO
STANDARD 9912-4
First edition
2018-08
Agricultural irrigation equipment —
Filters for microirrigation —
Part 4:
Granulated media filters
Matériel agricole d'irrigation — Filtres pour micro-irrigation —
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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Phone: +41 22 749 01 11
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Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design and construction requirements . 2
4.1 General . 2
4.2 Inlet and expansion space chamber . 5
4.3 Media chamber . 5
4.4 Collection (underdrain) and back flushing unit . 5
4.5 Prefiltration element. 5
4.6 Back flushing control . 6
4.6.1 Mandatory requirements . 6
4.6.2 Optional features . 6
5 Resistance of the filter to internal hydrostatic pressure . 6
5.1 General . 6
5.2 Preparation . 7
5.3 Static pressure test . 7
5.4 Cyclic pressure test . 7
5.5 Collection (underdrain) and back flushing unit resistance to buckling or tearing . 8
6 Clean pressure drop test . 9
6.1 General . 9
6.2 Flow rates and test sequence . 9
6.3 Filter media . 9
6.4 Prescreening . 9
6.5 Inlet and outlet pressures. 9
6.6 Test duration . 9
6.7 Report .10
7 Back flushing tests .10
7.1 Back flushing parameters .10
7.2 Media escape test .10
8 Automatic back flushing and controller .11
8.1 Back flushing initiation .11
8.2 Flushing control mechanism test .11
8.2.1 Mechanism activated by pressure drop .11
8.2.2 Mechanism activated by duration of operation .11
8.2.3 Mechanism activated by volume of filtered water .11
8.2.4 Mechanism activated by another physical quantity .12
8.3 Operation of the protective device .12
9 Information to be supplied by the manufacturer .12
9.1 General .12
9.2 Filter data .13
9.3 Back flushing controller .13
Annex A (informative) Types of irrigation media filters .14
Annex B (informative) Granulated media .15
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
A list of all parts in the ISO 9912 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 9912-4:2018(E)
Agricultural irrigation equipment — Filters for
microirrigation —
Part 4:
Granulated media filters
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 B provides information on granulated media.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. 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
ISO 9912-1, Agricultural irrigation equipment — Filters for micro-irrigation — Part 1: Terms, definitions
and classification
ISO 9912-2:2013, Agricultural irrigation equipment — Filters for microirrigation — Part 2: Strainer-type
filters and disc filters
ISO 9912-3, Agricultural irrigation equipment — Filters for microirrigation — Part 3: Automatic flushing
strainer-type filters and disc filters
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9912-1, ISO 9912-3 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
granulated media filter
media filter
permeable granulated media, such as sand, gravel, crushed granite or synthetic material, with a specific
gravity higher than water and used for filtration, provided the granules can be fluidized during back
flushing
3.2
clogged filter element
filter element that
...

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