1、November 2015 English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21.140; 23.080!%Gk=“2367226www.
2、din.deDIN EN 16752Centrifugal pumps Test procedure for seal packings;English version EN 16752:2015,English translation of DIN EN 16752:2015-11Kreiselpumpen Abnahmeprfung fr Packungen;Englische Fassung EN 16752:2015,Englische bersetzung von DIN EN 16752:2015-11Pompes centrifuges Procdure dessai pour
3、garnitures tresses;Version anglaise EN 16752:2015,Traduction anglaise de DIN EN 16752:2015-11www.beuth.deDocument comprises 17 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.11.15DIN EN 16752:2015-11 2 A comma is used as the d
4、ecimal marker. National foreword This document (EN 16752:2015) has been prepared by Technical Committee CEN/TC 197 “Pumps” (Secretariat: AFNOR, France). The responsible German body involved in its preparation was DIN-Normenausschuss Maschinenbau (DIN Standards Committee Mechanical Engineering), Work
5、ing Committee NA 060-11-01 AA Kreiselpumpen of Section Pumpen. Representatives of manufacturers and users of pumps, and of the employers, liability insurance associations contributed to this standard. The European Standards referred to in Clause 2 and in the Bibliography of the EN have been publishe
6、d as the corresponding DIN EN or DIN EN ISO Standards with the same number. For the International Standards referred to in this standard there are no national standards available unless they have been published as DIN ISO standards with the same number. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE N
7、ORM EN 16752 September 2015 ICS 21.140; 23.080 English Version Centrifugal pumps - Test procedure for seal packings Pompes centrifuges - Procdure dessai pour garnitures tresses Kreiselpumpen - Abnahmeprfung fr Packungen This European Standard was approved by CEN on 1 August 2015. CEN members are bou
8、nd 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 C
9、EN-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 Centre
10、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,
11、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Br
12、ussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16752:2015 EEN 16752:2015 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Test facility, testing apparatus . 4 5
13、 Pre-test procedure 7 6 Installation 7 7 Test conditions . 8 7.1 General 8 7.2 Test medium . 8 7.3 Shaft diameter 8 7.4 Packing cross section . 8 7.5 Surface speed 8 7.6 Pressure 8 7.7 Tightness-classes. 8 8 Test Procedure . 8 8.1 Break-in period 8 8.2 Test duration 9 8.3 Result recording 9 8.4 Glan
14、d adjustments 9 8.5 Number of tests 9 8.6 Test completion . 9 9 Reporting . 9 Annex A (normative) Packing test report template 11 Annex B (informative) Typical graphical representation of results . 14 Bibliography . 15 DIN EN 16752:2015-11 EN 16752:2015 (E) 3 European foreword This document (EN 1675
15、2:2015) has been prepared by Technical Committee CEN/TC 197 “Pumps”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2016, and conflicting national
16、 standards shall be withdrawn at the latest by March 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELE
17、C Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Icel
18、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 16752:2015-11 EN 16752:2015 (E) 4 1 Scope This European Standard gives details of a test procedure for pack
19、ings to be used to seal the stuffing boxes of centrifugal pumps. It gives provisions on the design of test equipment, standard test parameters and reporting criteria. It does not specify performance criteria which should be agreed between supplier and customer, but does define 3 tightness classes. W
20、hen necessary, this European Standard is also applicable to packings used on other rotary equipment such as mixers and agitators. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated refe
21、rences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 286-2, Geometrical product specifications (GPS) ISO code system for tolerances on linear sizes Part 2: Tables of standard tolerance classes and lim
22、it deviations for holes and shafts (ISO 286-2) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 stuffing box space into which compression packing is inserted Note 1 to entry: Stuffing box is also known as packing gland. 3.2 gland follower part
23、 that provides into a stuffing box to compress a packing set or a packing ring 3.3 shaft metal rod connecting the impeller of a pump to the motor 3.4 leakage flow of liquid permitted to pass the packing 3.5 housing bore dimension of the annular space that packing is inserted into 4 Test facility, te
24、sting apparatus The test facility shall be arranged as described in Figure 1. DIN EN 16752:2015-11 EN 16752:2015 (E) 5 Key 1 tank 2 valve 3 direction of flow 4 pump 5 pressure container 6 water circulation pump 7 pressure gauge 8 flow measurement 9 drain 10 inlet temperature gauge 11 outlet temperat
25、ure gauge 12 testing apparatus 13 alternate return line 14 heat exchanger Figure 1 Test arrangement The testing apparatus shall be compliant with the description given in Figure 2. In particular, it shall consist of a suitable housing for retaining the test fluid and either one or more stuffing boxe
26、s to house the test packing. Each stuffing box shall be fitted with a gland follower and suitable retaining plate capable of controlled axial adjustment. There shall be a test shaft mounted on suitable bearings and attached to a suitable drive mechanism. DIN EN 16752:2015-11 EN 16752:2015 (E) 6 Key
27、1 motor 2 test shaft 3 gland follower 4 stuffing box 5 test packing 6 torque measurement 7 gland follower temperature 8 water in 9 water out 10 shaft leakage measurement 11 gland leakage measurement Figure 2 Testing apparatus details The testing apparatus shall also conform to the following addition
28、al requirements: a) the shaft speed shall be controlled within a maximum variation of 5 %; b) the test head shall be designed and constructed so as to maintain stuffing box bore alignment relative to the shaft axis within 0,10 mm; c) the design of the test head and support shall ensure minimum vibra
29、tion; d) the surface roughness of the stuffing box bore shall be no worse than 1,6 m Ra. The surface roughness of the shaft shall be no worse than 0,4 m Ra and the shaft shall be free of helical machine marks; e) shaft and housing shall be manufactured from corrosion resistant stainless steel (e.g.
30、1.4016 or 1.4404 in accordance with EN 10088-1) without surface coating and shaft hardness shall be 40 HRC minimum; f) the tolerances on shaft and stuffing box bore shall be h10 and H10 respectively in accordance with EN ISO 286-2; DIN EN 16752:2015-11 EN 16752:2015 (E) 7 g) the test fluid shall be
31、circulated through the test housing at a rate such that the temperature of the test medium entering the housing remains constant within 5 C and the outlet temperature is no more than 10 C higher than the inlet temperature; h) means shall be provided for collecting and measuring the volume of fluid l
32、eakage during the test, the leakage from the shaft and stuffing box bore sides shall be measured separately; i) means shall be provided to measure the temperature of the fluid as it enters and leaves the test housing and the temperature of the gland follower within (3 0,5) mm of the outer packing ri
33、ng (i.e. packing temperature). In particular, a probe shall be positioned in a blind hole drilled axially into the gland follower; j) means shall be provided to measure frictional power consumption of the packing. This shall be achieved by continuous torque measurement. The following value, called h
34、ereafter Normalized Power Consumption, shall be then calculated by taking the power in Watts divided by the packing contact area in square metres divided by the speed in metres per second rationalised to Ws/m3. Normalized Power Consumption (W.s/m3) = ( )( )( )2/PWSc m linear rotation speed m sWith d
35、issipated power ( ) ( ) ( )= /P W T N m rad s where T is the measured torque With ( ) ( ) = 2/60rad s rotation speed rpm With Surface contact Sc (m2) = x D (m) x L (m) where D is shaft diameter and L is packing height With linear rotation speed (m:s) = ( ) ( )60rotation speed rpm D mwhere D is shaft
36、 diameter The test packing shall be made of 4 pre-formed rings or 4 rings of packing cut from length form material to size, cut with a skive (diagonal) cut in accordance with installation good practice. NOTE FSA/ESA gives guidelines for good practice in the document Compression Packing Technical Man
37、ual (3rd Edition). 5 Pre-test procedure Prior to the installation of rings in the stuffing box, the following steps shall be undertaken: 1) Inspect the packing for conformity to its specification and measure and record its cross-section dimensions: measure the radial cross-section of each ring at tw
38、o diametrically opposite positions and record the average section of the whole set and the overall set depth. 2) Measure and record the shaft and housing bore diameters and their surface roughness. 3) Weigh each ring and record the weight of the set. 6 Installation The 4 rings of packing in each stu
39、ffing box shall be installed as follows: Install one ring at a time. Make sure it is clean and has not picked up any dirt in handling. Seat rings firmly (except PTFE filament and graphite yarn packings to which only sufficient pre-load should be applied to ensure full axial contact and then tightene
40、d gradually after start up). DIN EN 16752:2015-11 EN 16752:2015 (E) 8 Joints of successive rings should be staggered and kept at least 90 degrees apart. Each individual ring should be firmly seated (no axial gaps between the rings) with a tamping tool, or suitable split bushing fitted to the stuffin
41、g box bore. When enough rings have been fitted so that the nose of the gland will reach them, individual tamping should be supplemented by the gland. After the 4thring is installed, take up gland bolts finger tight. Do not jam the packing into place by excessive gland loading. Lantern or spacer ring
42、s shall not be fitted between packing rings. 7 Test conditions 7.1 General Any additional tests carried out under different conditions than specified (e.g. other media, pressure, speed, etc.) should be reported. All tests shall be carried out at ambient temperature, i.e. the fluid shall enter the te
43、st housing at 20 C with a possible deviation of +10/-5 C. 7.2 Test medium The test medium shall be clean water. 7.3 Shaft diameter The shaft diameter shall be between 40 mm and 65 mm inclusive. 7.4 Packing cross section The nominal packing cross-section shall be between 9,5 mm and 12,7 mm inclusive.
44、 7.5 Surface speed Packings shall be tested at one steady speed rating, chosen between 8 m/s and 9 m/s inclusive. 7.6 Pressure Packings shall be tested at the steady pressure rating of 0,6 MPa with a possible deviation of 0,1 MPa, and the pressure shall be monitored within the test housing. 7.7 Tigh
45、tness-classes Test shall be performed in order to achieve one of the three following Tightness classes T1, T2 or T3 during the 100 h test period (that is, excluding the break-in period), corresponding to the following total leakage levels: T1 = less than or equal to 5 ml/min T2 = less than or equal
46、to 15 ml/min T3 = less than or equal to 30 ml/min 8 Test Procedure 8.1 Break-in period The following steps critical to get optimum packing performance during test shall be undertaken: DIN EN 16752:2015-11 EN 16752:2015 (E) 9 Pressurize the test housing and rotate the shaft at the selected test speed
47、. Adjust the compression on the packing to allow liberal leakage (around 15 ml/min to 30 ml/min) as it beds in and then adjust compression to give the desired leakage class, without causing excessive or fluctuating packing temperature. Record the total number of any adjustments to compression and th
48、e total compression applied during the break-in period. Record the leakage rate at the end of the break-in period (measure the leakage over a 5 min period and record the average). The actual duration of the breaking period shall be recorded. NOTE Typically the total break-in period will be of less t
49、han 1 h duration but this is sometimes extended in order to achieve stable performance. 8.2 Test duration At time zero, that is, after the end of the break-in period (i.e. once the packing is exhibiting stable leak rate and temperature) the power consumption and temperatures shall be recorded (see Clause 4 for details on provisions). The packing shall then be tested continuously for a minimum duration period of 100 h 8.3 Result recording The following data shall be recorded: the accumulative leakage, power consum
