1、PUBLISHED DOCUMENT PD CEN/TR 14920:2005 Jetting resistance of drain and sewer pipes Moving jet test method ICS 93.030 PD CEN/TR 14920:2005 This Published Document was published under the authority of the Standards Policy and Strategy Committee on 21 April 2005 BSI 21 April 2005 ISBN 0 580 45847 4 Na
2、tional foreword This Published Document is the official English language version of CEN/TR 14920:2005. The jetting resistance test method was developed in response to a request from CEN/TC 165. The proposed standard was to incorporate both stationary and moving jet tests as material and system tests
3、, based on those developed by WRc in the preparation of its sewer jetting code of practice. In order to obtain European approval for publication as a Technical Report the stationary jet test was removed. The UK participation in its preparation was entrusted to Technical Committee B/505, Waste water
4、engineering, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogu
5、e under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp
6、retation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the CEN/TR title page, pages 2 to 14, an inside back cover and
7、a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsTECHNICALREPORT RAPPORTTECHNIQUE TECHNISCHERBERICHT CEN/TR14920 March2005 ICS93.030 Englishversion Jettingresistanceofdrainandsewer
8、pipesMovingjettest method Rsistancedestubespourlesbranchementsetles collecteursdassainissementdurantleprocdde dbourbagesoushautepressionMthodedessai WiderstandsfhigkeitvonRohrleitungsteilenfr AbwasserkanleundleitungenbeimHochdrucksplen PrfungmitbeweglicherDse ThisTechnicalReportwasapprovedbyCENon23A
9、ugust2004.IthasbeendrawnupbytheTechnicalCommitteeCEN/TC165. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slove
10、nia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.CEN/TR14920:20
11、05:ECEN/TR 14920:2005 (E) 2 Contents Page Foreword3 1 Scope4 2 Definitions and Symbols.4 2.1 Definitions4 2.2 Further symbols.4 3 Test method5 3.1 Principle5 3.2 General Requirements5 3.2.1 Water source5 3.2.2 Pressure measurement.5 3.2.3 Test temperature5 3.3 Apparatus.5 3.3.1 Pump unit.5 3.3.2 Flo
12、w rate and pressure accuracy.5 3.3.3 Nozzle5 3.4 Test rig6 3.5 Test assembly7 3.6 Procedure.7 3.6.1 Pre-test procedure.7 3.6.2 Test procedure.7 3.7 Recording of test results 8 Annex A (informative) Guidance on the evaluation of surface damage 9 Annex B (normative) Determination of jet spread angle.1
13、0 Annex C (informative) Basic Principles for calculation of C d , P jand D j .11 C.1 Calculation of C d 11 C.2 Jet Power P j 12 C.3 Jet Power Density D j .13 CEN/TR 14920:2005 (E) 3 Foreword This document (CEN/TR 14920:2005) has been prepared by Technical Committee CEN/TC 165 “Waste water engineerin
14、g”, the secretariat of which is held by DIN. High pressure water jetting has become more used in cleaning practice of drains and sewers. Considering that, CEN/TC 165 decided to develop a test method for the resistance of pipe materials against high pressure water jetting. Due to a low level of exper
15、ience with the newly developed test method applied to different materials and considering some aspects of reproducibility have not been proved, a European Standard is not feasible for the time being. Therefore CEN/TC 165 decided to give initial guidance to the market by publishing a test method as a
16、 Technical Report (CEN/TR). The test method specified in this document is intended to simulate the effect of high pressure cleaning on drains and sewers. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to announce this CEN
17、Technical Report: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. CEN/TR 149
18、20:2005 (E) 4 1 Scope This document specifies a test method for the resistance to high pressure clean water jetting of pipes, fittings and joints used for drains and sewers. This test method is also applicable to components for renovation and replacement of drains and sewers. 2 Definitions and Symbo
19、ls For the purposes of this Technical Report, the following definitions and symbols apply. 2.1 Definitions 2.1.1 jet power P jenergy per time unit of the jet leaving a nozzle NOTE Jet Power is expressed in Watts. 2.1.2 jet power density D jjet power per unit of the impinged area NOTE Jet power densi
20、ty is expressed in Watts per square millimetres. 2.1.3 jet spread angle spread of the jet related to its axis NOTE Jet spread angle is expressed in degrees. 2.1.4 Nozzle assembly of components which convert high pressure water flow into a jet (see Figure 1a) 2.1.5 Nozzle insert special ceramic compo
21、nent to form a specified jet (see Figure 1c) 2.2 Further symbols Table 1 Symbol Symbol Term Unit angle of the jet axis to the test surface (see Figure B.1) C dcoefficient of discharge of a nozzle d orifice diameter of the nozzle insert mm h vertical distance between the test surface and the centre o
22、f the nozzle orifice mm p pressure measured not more than one metre upstream of the nozzle MPa Q flow rate l/min CEN/TR 14920:2005 (E) 5 3 Test method 3.1 Principle A high pressure water jet is directed at a specified angle to and distance from the test surface. It is moved relative and parallel to
23、the test surface. The resulting mechanical load (expressed as jet power density) is kept within specified limits for the duration of the test by controlling the parameters of water pressure, flow rate, distance and jet spread angle. The nozzle and the insert to be used are specified in this document
24、. After the test the surface of the test piece is inspected. 3.2 General Requirements 3.2.1 Water source The water is in accordance with drinking water quality standards in respect of chemicals and particulates. 3.2.2 Pressure measurement A pressure measurement device with an accuracy of 0,1 % is co
25、nnected to the water supply no more than 1 m from the nozzle. The pipe between the position where the pressure is measured and the nozzle shall have an unrestricted bore not less than 15 mm. 3.2.3 Test temperature The test is carried out at an ambient air temperature of (15 10) C with water at a tem
26、perature of (15 10) C near the pump inlet. 3.3 Apparatus 3.3.1 Pump unit The pump unit is capable of delivering water at a pressure of at least 15 MPa and a flow rate of at least 60 l/min. A pressure equaliser is incorporated, if necessary, to limit the pressure variations due to pump action to 1 %
27、of the mean value. 3.3.2 Flow rate and pressure accuracy A means of measuring flow rate to an accuracy of 0,1 l/min at a flow rate of (46 0,5) l/min and a means of measuring the pressure no more than 1 m from the nozzle to an accuracy of 0,1 % at a pressure of (12 0,2) MPa is used 3.3.3 Nozzle All d
28、imensions of the nozzle shall conform to Figure 1. The nozzle shall have a ceramic insert with an orifice diameter of (2,80 0,02) mm. The diameter is measured to an accuracy of 0,002 mm. The ceramic insert shall produce a jet spread angle of 3,3 and is checked according to Annex B. When using this n
29、ozzle together with the specified nominal test parameters, the jet power density D jis 480 W/mm 2when calculated according to Annex C. Nominal test parameters are in accordance with Table 2: CEN/TR 14920:2005 (E) 6 Table 2 Nominal test parameters Test parameter Value Note Q 46 l/min (see 3.6.1) p 12
30、 MPa (see 3.6.1) h 10 mm (see 3.4) 30 (see 3.4) d 2,8 mm (see 3.3.3) Measurements in mm Figure 1a Nozzle Figure 1 b Nozzle details Figure 1c Nozzle insert Figure 1 Nozzle geometry 3.4 Test rig The test rig is capable of supporting the test section and holding the nozzle at an angle of (30 1) to the
31、test surface, at a vertical distance h of ( 0 2 10 ) mm measured to the centre of the orifice, from the internal test section CEN/TR 14920:2005 (E) 7 surface. There is a means of moving the jet relative to the test section or vice versa. Ensure that this longitudinal traverse is parallel to the test
32、 section axis and the path of the jet is along the invert of the test section. The velocity of travel is (1 0,1) metres per minute. 3.5 Test assembly The test assembly shall consist of a half section pipe and a half section of a junction joined together, including the sealing element. A typical test
33、 assembly is shown in Figure 2. The overall length of the test assembly is at least 1,8 m to allow at least 150 mm beyond either end of the 1,5 m test length for change of direction of travel and acceleration to the test velocity. In cases when it is impractical to include the sealing element into t
34、he test assembly, a separate test is carried out on a small test assembly comprising two short lengths of full section jointed pipes. In cases were it is possible to do the tests on full sections, this is permitted if full evaluation can be guaranteed. 3.6 Procedure 3.6.1 Pre-test procedure Start th
35、e pump unit with the flow running to dump, then divert to the nozzle, adjust the pressure p at (12 0,2) MPa and measure the flow rate. Confirm that at this pressure the flow rate Q is (46 1) l/min. If the flow is not in this range, then check the nozzle orifice diameter/conditions and all connection
36、s or replace the nozzle insert. Repeat the pre-test procedure until the unit is running at a steady rate at the specified conditions. Take a photograph and determine in accordance with Annex B. The interior surface of the test length is inspected prior to testing and any imperfection is recorded. Pl
37、ace the test assembly into the rig and adjust to level. The nozzle is fixed at of (30 1) to the surface of the test assembly prior to the start of the test length, as given in Figure 2. Adjust the centre of the nozzle orifice to (10 +0/-1) mm vertically above the lowest point of the pipe invert alon
38、g the test length. 3.6.2 Test procedure Start the pump and ensure that the settings according to 3.6.1 are maintained. Move the test assembly relative to the jet or vice versa so that the jet travels along the line of the invert over the test length until it reaches at least 50 mm beyond the end of
39、the test length. Reverse the direction of travel and repeat the process. The rate of travel is 1 m/min with the tolerance according to 3.4. Repeat this cycle 50 times. The interior surface of the test length is inspected after testing. CEN/TR 14920:2005 (E) 8 Key 1 Nozzle l test length 2 Pipe surfac
40、e a side view h vertical distance between the test surface and the centre of the nozzle orifice (see 2.2) b plan view angle of the jet axis to the test surface (see 2.2) Figure 2 Typical test assembly 3.7 Recording of test results The following parameters are recorded a) Any imperfection noticed bef
41、ore testing b) clear identification of test pipes; c) ambient temperature and water inlet temperature in C; d) test pressure p in MPa; e) nozzle orifice diameter d in mm; f) flow rate Q in l/min; g) jet spread angle h) a description of the appearance of the test surface after completion of 50 cycles
42、 NOTE Guidance concerning the evaluation of surface damage is given in informative Annex A. CEN/TR 14920:2005 (E) 9 Annex A (informative) Guidance on the evaluation of surface damage For the evaluation of surface damage reference should be made to the appropriate clauses specifying acceptable surfac
43、e appearance in the relevant product standards. EN 295-1:1991, Vitrified clay pipes and fittings and pipe joints for drains and sewers Part 1: Requirements. EN 588-1:1996, Fibre-cement pipes for sewers and drains art 1: Pipes, joints and fittings for gravity systems. EN 598:1994, Ductile iron pipes,
44、 fittings, accessories and their joints for sewerage application Requirements and test methods. EN 877:1999, Cast iron pipes and fittings, their joints and accessories for the evacuation of water from buildings Requirements, test methods and quality assurance. EN 1916:2002, Concrete pipes and fittin
45、gs, unreinforced, steel fibre and reinforced. EN 1401-1:1998, Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride) (PVC-U) - Part 1: Specifications for pipes, fittings and the system. EN 1852-1:1998, Plastics piping systems for non-pressure
46、underground drainage and sewerage - Polypropylene (PP) - Part 1: Specifications for pipes, fittings and the system. prEN 12666-1, Plastics piping systems for non-pressure underground drainage and sewerage - Polyethylene (PE) - Part 1: Specifications for pipes, fittings and the system. prEN 13476-1,
47、Plastics piping systems for non-pressure underground drainage and sewerage - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 1: Specifications for pipes, fittings and the system. EN 13566-1, Plastics piping systems for ren
48、ovation of underground non-pressure drainage and sewerage networks - Part 1: General. EN 13566-2, Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 2: Lining with continuous pipes. EN 13566-3, Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 3: Lining with close-fit pipes. EN 13566-4, Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 4: Lining with cured-in-place pipe
