1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 16438:2012Agricultural irrigationequipment Thermoplasticcollapsible hoses for irrigation Specifications and testmethodsBS ISO 16438:2012 BRITISH STANDARDNational forewordT
2、his British Standard is the UK implementation of ISO 16438:2012. The UK participation in its preparation was entrusted to TechnicalCommittee AGE/30, Irrigation and drainage equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication do
3、es not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 72969 0 ICS 65.060.35 Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 16438:2012 ISO 2012Agricultural irrigation equipment Thermoplastic collapsible hoses for
5、irrigation Specifications and testmethodsMatriel agricole dirrigation Tuyaux crasables en matires thermoplastiques pour lirrigation Spcifications et mthodes dessaiINTERNATIONAL STANDARDISO 16438First edition2012-12-01Reference number ISO 16438:2012(E)BS ISO 16438:2012ISO 16438:2012(E)ii ISO 2012 All
6、 rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO a
7、t the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 16438:2012ISO 16438:2012(E) ISO 2012 All rights reserved iiiCon
8、tents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Classification 25 Material 26 Marking 27 Dimensions . 37.1 Inside diameter . 37.2 Length . 37.3 Spacing of outlet connections 38 Fittings 39 Hydrostatic and hydraulic characteristics . 39.1 Proof press
9、ure test 39.2 Deformation under pressure and after relaxation . 39.3 Warping . 49.4 Head loss 410 Physical characteristics . 410.1 Opacity . 410.2 UV resistance 4Bibliography 5BS ISO 16438:2012ISO 16438:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation
10、 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.
11、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.International Standards are drafted in accordance with
12、 the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval
13、 by at least 75 % of the member bodies casting a vote.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.ISO 16438 was prepared by Technical Committee IS
14、O/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.iv ISO 2012 All rights reservedBS ISO 16438:2012ISO 16438:2012(E)IntroductionThermoplastic collapsible hoses have been introduced to agricultural irrigation projects in rec
15、ent years, e.g. as headers supplying drip tape systems or as replacement for gated pipes.Thermoplastic collapsible hoses for irrigation are a special “breed” of hoses. They have a unique combination of attributes and requirements, that are not covered by any other existing ISO International Standard
16、, thus justifying the preparation of a separate, dedicated standard. These aspects include: equal and accurate spacing of multiple outlet connections; very low elongation and amount of twist under pressure; resistance to most fertilizers and other chemicals employed in irrigation; protection against
17、 degradation by UV radiation; impermeability to incident light; defined pressure loss data.This International Standard is intended to cover all these aspects by specifying the requirements and the applicable test methods. ISO 2012 All rights reserved vBS ISO 16438:2012BS ISO 16438:2012Agricultural i
18、rrigation equipment Thermoplastic collapsible hoses for irrigation Specifications and test methods1 ScopeThis International Standard specifies requirements and test methods for reinforced and non-reinforced thermoplastic collapsible hoses, which are intended to be used as main and sub-main supply li
19、nes for the conveyance and distribution of water for irrigation at water temperatures up to 50 C.It is applicable to irrigation hoses with nominal diameters between 40 mm and 500 mm and working pressures between 0,3 bar (0,03 MPa) and 6 bar (0,6 MPa).This International Standard is applicable to two
20、types of hose configurations: distributor hose (with outlet connections) and plain hose (without outlet connections).2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refe
21、rences, the latest edition of the referenced document (including any amendments) applies.ISO 1402:2009, Rubber and plastics hoses and hose assemblies Hydrostatic testingISO 4671:2007, Rubber and plastics hoses and hose assemblies Methods of measurement of the dimensions of hoses and the lengths of h
22、ose assembliesISO 4892-3:2006, Plastics Methods of exposure to laboratory light sources Part 3: Fluorescent UV lampsISO 7686:2005, Plastics pipes and fittings Determination of opacity3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1hoseflexible t
23、ube used for conveying water under pressure3.2collapsible hosehose which, when not under internal pressure, collapses to such an extent that the inner faces of the bore almost touch or make contact and the hose cross-section appears flatNOTE Adapted from ISO 8330:2007, definition 2.1.74.3.3reinforce
24、d hosehose which has a layer of a material or other component incorporated in its wall which serves to increase its strength3.4non-reinforced hosehose which has no reinforcing layer or component incorporatedINTERNATIONAL STANDARD ISO 16438:2012(E) ISO 2012 All rights reserved 1BS ISO 16438:2012ISO 1
25、6438:2012(E)3.5water outlet connectionsconnection points for irrigation laterals in hose wall, equally spaced along its length3.6maximum working pressuremaximum operating pressure MOPhighest water pressure in a hose recommended by the manufacturer to ensure proper operation3.7nominal diameternumeric
26、al designation used to refer to the size of the hose, approximately equal to the actual internal diameter of the hose3.8twistingangular deflection of a hose created when pressurized by rotation of one of its ends relative to its other end3.9warpingdeviation of a hose centreline from straight when pr
27、essurizedNOTE Adapted from ISO 8330:2007, definition 2.1.147.4 ClassificationHoses are classified as one of the following two types:a) Plain hose hose without any outlets;b) Distributor hose hose having multiple water outlet connections along its length.5 MaterialThe hoses shall be made of thermopla
28、stic materials.The hoses shall be opaque and protected against degradation by solar (UV) radiation and other environmental effects. They shall be resistant to fertilizers and other chemicals commonly employed in agricultural irrigation.6 MarkingEach hose shall bear clear and durable marking, repeate
29、d at intervals of not more than 10 m, including the following details:a) manufacturers name or trademark;b) the word IRRIGATION;c) nominal diameter;d) maximum working pressure;e) production year and month;f) the number of this International Standard: ISO 16438.2 ISO 2012 All rights reservedBS ISO 16
30、438:2012ISO 16438:2012(E)7 Dimensions7.1 Inside diameterWhen measured in accordance with ISO 4671, the inside diameter of a hose shall not deviate by more than 2 % from the inside diameter declared by the manufacturer.7.2 LengthThe total length of hose supplied, when measured at ambient temperature
31、in straight, uncoiled condition, shall not be less than the length declared by the manufacturer.7.3 Spacing of outlet connectionsMeasure the spacing (distance between centres) of five consecutive outlet connections to the nearest 1 mm.The actual spacing shall not deviate by more than 5 % from the sp
32、acing declared by the manufacturer and the absolute value of the sum of all signed (+ or ) deviations, shall not exceed 5 %.8 FittingsFor each size of hose, the manufacturer shall be able to present suitable fittings to make secure connections between hoses and between the hose and common water sour
33、ces.The fittings shall be watertight and withstand the maximum working pressure of the hoses to which they are connected.9 Hydrostatic and hydraulic characteristics9.1 Proof pressure testPerform the test in accordance with ISO 1402:2009 Subclause 8.1, for a duration of one hour and at a water temper
34、ature of 50 C. Test pressure shall be as indicated in Table 1.Table 1 Proof test pressureMaximum working pressure of the hose Test pressurePmaxbar (MPa)bar (MPa)from 0,3 bar (0,03 MPa) up to 1,5 bar (0,15 MPa) 1,5 x Pmaxabove 1,5 bar (0,15 MPa) up to 4,0 bar (0,40 MPa) 1,8 x Pmaxabove 4,0 bar (0,40
35、MPa) up to 6,0 bar (0,60 MPa) 3,0 x PmaxWhile testing distributor hose, ensure that the test piece includes at least one outlet, which is sealed according to the hose manufacturers instructions.The test piece shall not show any evidence of leakage, cracking, delamination, abrupt distortion or other
36、signs of failure at the hose wall or, for distributor type hose, at any of the outlets.9.2 Deformation under pressure and after relaxationPerform the test in accordance with ISO 1402:2009 Subclause 8.2, for a duration of one hour and at a water temperature of 50 C. Use a test pressure equal to the m
37、aximum working pressure of the hose. ISO 2012 All rights reserved 3BS ISO 16438:2012ISO 16438:2012(E)At the end of one hour, while still under pressure, the following requirements apply: the measured change in length shall not exceed +1 %; for distributor type hose, the measured amount of twisting s
38、hall not exceed 0,1 /m.One hour after the complete removal of pressure, the following requirements apply: the remaining change in length from the start of the test shall not exceed +0,8 %; the remaining change in diameter from the start of the test shall not exceed +1,6 %.9.3 WarpingPerform the test
39、 in accordance with ISO 1402:2009 Subclause 8.2.5, using water at 23C. The sample length shall be at least 100 diameters but not less than 20 m. Use a test pressure equal to the maximum working pressure of the hose.The measured amount of warping shall not exceed 5 mm per 1 m length.9.4 Head lossThe
40、head loss of the hoses shall be determined by the manufacturer, optionally using the calculation method given in ISO/TR 10501, and be reported in the manufacturers documentation.10 Physical characteristics10.1 OpacityWhen tested in accordance with ISO 7686, the percentage of incident light energy tr
41、ansmitted through the hose wall shall not exceed 0,2 %.10.2 UV resistancePerform the test in accordance with ISO 4892-3 for 1 500 h, using a cycle of 8 h UVB radiation at 60 C followed by 4 h condensation at 50 C. The hose shall not show signs of cracks or other defects rendering it unserviceable.4
42、ISO 2012 All rights reservedBS ISO 16438:2012ISO 16438:2012(E)Bibliography1 ISO 8330: 2007, Rubber and plastics hoses and hose assemblies Vocabulary2 ISO/TR 10501: 1993, Thermoplastics pipes for the transport of liquids under pressure Calculation of head losses3 ISO 16149: 2006, Agricultural irrigat
43、ion equipment PVC above-ground low-pressure pipe for surface irrigation Specifications and test methods ISO 2012 All rights reserved 5BS ISO 16438:2012ISO 16438:2012(E) ISO 2012 All rights reservedICS 65.060.35Price based on 5 pagesThis page deliberately left blankBSI is the independent national bod
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