1、BSI Standards PublicationBS EN ISO 17778:2015Plastics piping systems Fittings, valves and ancillaries Determination of gaseous flow rate/pressure dropr e l a t i o n s h i p sBS EN ISO 17778:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 17778:2015. It
2、 supersedes BS EN 12117:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to
3、include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83475 2 ICS 23.040.20, 23.040.45, 23.060.01Compliance with a British Standard cannot confer immunity fro
4、m legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17778 March 2015 ICS 23.040.2
5、0; 23.040.45; 23.060.01 Supersedes EN 12117:1997English Version Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow rate/pressure drop relationships (ISO 17778:2015) Systmes de canalisations en plastiques - Raccords, robinets et quipements auxiliaires - Dtermin
6、ation du rapport dbit gazeux/perte de charge (ISO 17778:2015) Kunststoff-Rohrleitungssysteme - Formstcke, Armaturen und Zubehrteile - Bestimmung des Zusammenhanges zwischen Gasdurchfluss und Druckabfall (ISO 17778:2015)This European Standard was approved by CEN on 14 November 2014. CEN members are b
7、ound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the
8、 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centr
9、e has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
10、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000
11、 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17778:2015 EEN ISO 17778:2015 (E) 3 Foreword This document (EN ISO 17778:2015) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes,fittings and valv
12、es for the transport of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plasticspiping systems and ducting systems” the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsem
13、ent, at the latest by September 2015, and conflicting national standards shall bewithdrawn at the latest by September 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. CEN and/or CENELEC shall not be held responsible for identi
14、fying any or all such patent rights. This document supersedes EN 12117:1997. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, CzechRepublic, De
15、nmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement no
16、tice The text of ISO 17778:2015 has been approved by CEN as EN ISO 17778:2015 without any modification. BS EN ISO 17778:2015BS EN ISO 17778:2015ISO 17778:2015(E)Foreword iv1 Scope . 12 Normative references 13 Principle 14 Apparatus . 15 Test pieces preparation . 36 Procedure. 37 Calculation of resul
17、ts . 48 Test report . 4 ISO 2015 All rights reserved iiiContents PageBS EN ISO 17778:2015ISO 17778:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
18、ally 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 t
19、he 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
20、 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 docume
21、nt 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/
22、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 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO prin
23、ciples in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves
24、of plastics materials and their accessories Test methods and basic specifications.This is the first version of this International Standard. This edition of ISO 17778 is prepared under Vienna Agreement so that the content is aligned with the EN 12117:1997, which will be replaced.iv ISO 2015 All right
25、s reservedBS EN ISO 17778:2015Plastics piping systems Fittings, valves and ancillaries Determination of gaseous flow rate/pressure drop relationshipsWARNING Persons using this International Standard should be familiar with normal laboratory practice, if applicable. The use of this International Stan
26、dard can involve hazardous materials, operations, and equipment. This International Standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practic
27、es and determine the applicability of regulatory limitations prior to use.1 ScopeThis International Standard specifies a method for determining the flow rate/pressure drop relationship of components for plastics piping systems when tested using air at 25 mbar.NOTE 1 bar = 105N/m2.2 Normative referen
28、cesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 83
29、7-1, Pressure gauges Part 1: Bourdon tube pressure gauges Dimensions, metrology, requirements and testing3 PrincipleUtilizing a constant main pressure, the flow rate through a piping component is varied between specific limits to assess the pressure drop. The average value of the air flow rate for a
30、 pressure drop appropriate to the size of the component is then determined. The value for other gases can be calculated on the basis of density differences.NOTE It is assumed that the following test parameters are set by the standard making reference to this International Standard:a) the relevant va
31、lue(s) for pressure drop, pn(see 7.2);b) the relevant value to be used for airand the relevant temperature and pressure if not as given in 7.3;c) the relevant value to be used for gasand the relevant temperature and pressure if not as given in 7.3.4 Apparatus4.1 Schematic test arrangement for determ
32、ination of flow rate/pressure drop relationship is shown in Figure 1.4.2 A source of air.INTERNATIONAL STANDARD ISO 17778:2015(E) ISO 2015 All rights reserved 1BS EN ISO 17778:2015ISO 17778:2015(E)4.3 Pressure controller (A), capable of maintaining an output pressure of (25 0,5) mbar.4.4 Flow meter
33、(B), accurate to 2 % and of the positive displacement or turbine type.4.5 Manometer (C), for measuring the gas pressure in the main line and capable of checking conformity to 4.2, 6.4, and 6.7 (class 0,6 or better as specified in EN 837-1).4.6 Manometer (G), for measuring differential pressure p, co
34、nforming to class 0,25 of EN 837-1.4.7 Outlet valve (E).KeyA pressure controller E outlet valveB flow meter F reservoirC pressure manometer G differential pressure manometerD component under testFigure 1 Schematic test arrangement for determination of flow rate/pressure drop relationshipNOTE The dif
35、ferential pressure p is the pressure difference between that at point P1and that at point P2.2 ISO 2015 All rights reservedBS EN ISO 17778:2015ISO 17778:2015(E)5 Test pieces preparationThe test piece shall comprise the component to be tested fused or connected between two pieces of plastic pipe that
36、 fits the component and provided with connectors appropriate to the pressure drop apparatus.The free lengths of the plastic pipe and the geometry of the test arrangement shall conform to Figure 1.For tapping tees, the arrangement shall be such that the pressure drop can be measured through the outle
37、t branch.Pressure tang points upstream and downstream of the component under test shall be flush with the pipe bore and free from burrs.6 Procedure6.1 Carry out the following procedure at an ambient temperature of (23 2) C.6.2 Partially open the outlet valve (E).6.3 Open the inlet valve to the press
38、ure controller (A) so that air starts to flow and ensure that the air flows from the outlet valve only.6.4 By means of the pressure controller (A), regulate the air pressure in the main line at point P1as shown by manometer (C), to (25 0,5) mbar.6.5 Measure and record the flow rate, Q, on flow meter
39、 (B) (see 6.9) and the pressure drop, p, on manometer (G) (see Figure 1).6.6 Open the outlet valve (E) such that the air pressure at point P1in the main line is reduced at manometer (C) by approximately 5 mbar.6.7 Increase the flow rate until the air pressure in the main line at manometer (C) return
40、s to (25 0,5) mbar.6.8 Measure and record the flow rate, Q, and the pressure drop, p.6.9 Repeat operations 6.6, 6.7, and 6.8 until the outlet valve (E) is fully open. For tapping tees, the pressure drop shall be measured through the outlet branch.6.10 Consider the data acceptable if the following co
41、nditions are fulfilled:a) at least five sets of data for Q and p, and hence differing values for V (see 7.1) have been obtained;b) at least one value of V is 2,5m/s;c) at least one value of V is 7,5m/s.Otherwise, adjust the inlet valve opening and repeat 6.4 and 6.5, as necessary, to obtain the miss
42、ing value(s).If it is not possible for V to be 7,5m/s using a pressure of (25 0,5) mbar, stop the test and report this observation. ISO 2015 All rights reserved 3BS EN ISO 17778:2015ISO 17778:2015(E)7 Calculation of results7.1 Using each set of pressure drop values and the corresponding flow rates,
43、obtained in accordance with 6.5, 6.8, and 6.9, calculate the following:a) The velocity, V, of the flow, in metres per second (m/s), through the outlet pipe component of the test piece (see Clause 5) using Formula (1):VQA= (1)whereQ is the air flow rate, in cubic metres per hour (m3/h);A is the bore
44、area of the outlet pipe, in square metres (m2).b) The factor, F, for each set of readings, based on Formula (2):FpQ=2(2)wherep is the measured pressure drop, in millibars (mbar);Q is the air flow rate, in cubic metres per hour (m3/h).Calculate the average value of F.7.2 Using the average value of F
45、and the specified pressure drop, pn, calculate the average air flow rate, Qa, at that pressure drop.7.3 Calculate the equivalent flow rate(s) for any other gas Qgas(e.g. natural gas), in cubic metres per hour, using Formula (3):QQgasaairgas=(3)whereQais the average air flow rate at the relevant pres
46、sure drop(s) cubic metres per hour (m3/h);airis the density of air at 23 C and 1 bar, unless otherwise specified by the referring standard (kg/m3);gasis the density of the other gas at 23 C and 1 bar, unless otherwise specified by the referring standard (kg/m3).i.e. Qgas= (f)Q.8 Test reportThe test
47、report shall include the following information:a) a reference to this International Standard (i.e. ISO 17778) and the referring standard;b) all details necessary for identification of the test pieces, including the nominal size of the pipes and fittings used to produce the test pieces, the type of m
48、aterial, and the manufacturers code;4 ISO 2015 All rights reservedBS EN ISO 17778:2015ISO 17778:2015(E)c) the pressure drop, flow rate, and corresponding velocity for each set of data (see 7.1) measured;d) the average value of F, i.e. the relationship between pressure drop and flow rate (see 7.1);e)
49、 the calculated flow rate(s) at the specified pressure drop(s) for air (see 7.2) and for the other gas (see 7.3);f) factors that could have affected the results such as deviations from temperature limits, incidents, or operating details not specified in this International Standard;g) the date of the test. ISO 2015 All rights reserved 5BS EN ISO 17778:2015ISO 17778:2015(E) ISO 2015 All rights reservedICS 23.040.20Price based on 5 pagesThis page deliberately left blankBSI is the national body r
