1、BSI Standards PublicationBS EN 16752:2015Centrifugal pumps Testprocedure for seal packingsBS EN 16752:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16752:2015.The UK participation in its preparation was entrusted to Technical Committee MCE/6, Pumps and pu
2、mp testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by
3、 BSI Standards Limited 2015ISBN 978 0 580 86424 7 ICS 21.140; 23.080 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2015.Amendments/corrigenda issu
4、ed since publicationDate Text affectedBS EN 16752:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN 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 - Abnahmep
5、rfung fr Packungen This European Standard was approved by CEN on 1 August 2015. CEN members are bound 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 bi
6、bliographical references concerning such national standards may be obtained on application to the 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 resp
7、onsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre 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 Re
8、public of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORM
9、ALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16752:2015 EBS EN 16752:2015EN 16752:2015 (E) 2 Contents Page European f
10、oreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Test facility, testing apparatus . 4 5 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
11、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 Gland 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
12、of results . 14 Bibliography . 15 BS EN 16752:2015EN 16752:2015 (E) 3 European foreword This document (EN 16752:2015) 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, eithe
13、r by publication of an identical text or by endorsement, at the latest by March 2016, and conflicting national 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 CE
14、NELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Repu
15、blic, Denmark, 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. BS E
16、N 16752:2015EN 16752:2015 (E) 4 1 Scope This European Standard gives details of a test procedure for packings 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 performa
17、nce criteria which should be agreed between supplier and customer, but does define 3 tightness classes. When 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 pa
18、rt, 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 ISO 286-2, Geometrical product specifications
19、(GPS) ISO code system for tolerances on linear sizes Part 2: Tables of standard tolerance classes and limit 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
20、packing is inserted Note 1 to entry: Stuffing box is also known as packing gland. 3.2 gland follower part 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
21、packing 3.5 housing bore dimension of the annular space that packing is inserted into 4 Test facility, testing apparatus The test facility shall be arranged as described in Figure 1. BS EN 16752:2015EN 16752:2015 (E) 5 Key 1 tank 2 valve3 direction of flow 4 pump 5 pressure container 6 water circula
22、tion pump 7 pressure gauge 8 flow measurement 9 drain 10 inlet temperature gauge 11 outlet temperature gauge 12 testing apparatus 13 alternate return line 14 heat exchanger Figure 1 Test arrangementThe testing apparatus shall be compliant with the description given in Figure 2. In particular, it sha
23、ll consist of a suitable housing for retaining the test fluid and either one or more stuffing boxes 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
24、bearings and attached to a suitable drive mechanism. BS EN 16752:2015EN 16752:2015 (E) 6 Key 1 motor 2 test shaft 3 gland follower 4 stuffing box5 test packing 6 torque measurement 7 gland follower temperature 8 water in 9 water out 10 shaft leakage measurement11 gland leakage measurement Figure 2 T
25、esting apparatus details The testing apparatus shall also conform to the following additional 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
26、 axis within 0,10 mm; c) the design of the test head and support shall ensure minimum vibration; 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;
27、 e) shaft and housing shall be manufactured from corrosion resistant stainless steel (e.g. 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 accorda
28、nce with EN ISO 286-2; BS EN 16752:2015EN 16752:2015 (E) 7 g) the test fluid shall be 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 temp
29、erature; h) means shall be provided for collecting and measuring the volume of fluid leakage 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 housi
30、ng and the temperature of the gland follower within (3 0,5) mm of the outer packing ring (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.
31、This shall be achieved by continuous torque measurement. The following value, called hereafter 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. Nor
32、malized Power Consumption (W.s/m3) = ( )( )( )2/PWSc m linear rotation speed m sWith dissipated 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 hei
33、ght With linear rotation speed (m:s) = ( ) ( )60rotation speed rpm D mwhere D is shaft 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/ES
34、A gives guidelines for good practice in the document Compression Packing Technical Manual (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 re
35、cord its cross-section dimensions: measure the radial cross-section of each ring at two 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 ri
36、ng and record the weight of the set. 6 Installation The 4 rings of packing in each stuffing 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 onl
37、y sufficient pre-load should be applied to ensure full axial contact and then tightened gradually after start up). BS EN 16752:2015EN 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 betwee
38、n the rings) with a tamping tool, or suitable split bushing fitted to the stuffing 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
39、not jam the packing into place by excessive gland loading. Lantern or spacer rings 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 tes
40、ts shall be carried out at ambient temperature, i.e. the fluid shall enter the test 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
41、 The nominal packing cross-section shall be between 9,5 mm and 12,7 mm inclusive. 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
42、of 0,1 MPa, and the pressure shall be monitored within the test housing. 7.7 Tightness-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 t
43、otal leakage levels: T1 = less than or equal to 5 ml/min T2 = less than or equal to 15 ml/min T3 = less than or equal to 30 ml/min 8 Test Procedure 8.1 Break-in periodThe following steps critical to get optimum packing performance during test shall be undertaken: BS EN 16752:2015EN 16752:2015 (E) 9
44、Pressurize the test housing and rotate the shaft at the selected test speed. 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 te
45、mperature. Record the total number of any adjustments to compression and the 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 sh
46、all be recorded. NOTE Typically the total break-in period will be of less than 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 t
47、emperature) 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 consumption a
48、nd gland temperature at least four times per 24 h period and at the end of the test period (plus, prior to, and after, gland adjustments, see 8.4 below). 8.4 Gland adjustments Excluding the break-in period, a maximum of 3 gland adjustments may be made during the test period itself and the accumulati
49、ve leakage, power consumption and gland temperature shall be recorded immediately prior to each adjustment and 30 min thereafter. No gland adjustment shall be made less than one hour before completion of the total test period. 8.5 Number of tests A minimum of 2 complete tests shall be carried out for each packing type. 8.6 Test completionAt the end of the test period the packing, including any packing residue adhering to the shaft or housing shall be removed. The packing and residue shall be dried for a minimum of 4 h at
