EN 12261:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Plinomeri - Turbinski plinomeriGaszähler - TurbinenradgaszählerCompteurs de gaz - Compteurs de gaz à turbineGas meters - Turbine gas meters91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12261:2018SIST EN 12261:2018en,fr,de01-maj-2018SIST EN 12261:2018SLOVENSKI
STANDARDSIST EN 12261:2004/AC:2004SIST EN 12261:2004/A1:2006SIST EN 12261:20041DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12261
March
t r s z ICS
{ sä s v rä v r Supersedes EN
s t t x sã t r r tEnglish Version
Gas meters æ Turbine gas meters Compteurs de gaz æ Compteurs de gaz à turbine
Gaszähler æ Turbinenradgaszähler This European Standard was approved by CEN on
{ November
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t t x sã t r s z ESIST EN 12261:2018

Test facility specifications . 39 A.1 Test medium . 39 A.2 Leakage . 39 A.3 Installation conditions . 39 A.4 Reference standards . 39 Annex B (normative)
Perturbation testing . 40 B.1 General . 40 B.2 Terms and definitions . 40 SIST EN 12261:2018

Recommendations for use . 46 C.1 Pressure loss . 46 C.2 Spin test . 46 C.3 Locations of temperature measuring devices . 46 Annex D (normative)
Individual factory testing . 47 D.1 General . 47 D.2 Meter report . 47 Annex E (normative)
Metrological requirements and tests for each meter prior to dispatch (Individual meter testing) . 48 E.1 Information required from the purchaser (user) . 48 E.2 Determination of number of tests . 48 E.2.1 Criteria . 48 E.3 Error of indication . 49 E.3.1 Requirements . 49 E.3.2 Test . 50 E.4 Linearity . 50 E.4.1 Requirements . 50 E.4.2 Test . 50 E.5 Weighted mean error (WME) . 50 E.5.1 Requirement . 50 E.5.2 Test . 50 E.5.3 Adjustment . 51 E.6 Data plate specification . 51 E.7 Test certificate . 51 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2014/32/EU Measuring Instruments Directive aimed to be covered . 53 Bibliography . 60
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1 turbine gas meter measuring device in which the dynamic forces of the flowing gas cause a turbine wheel to rotate with a speed as a function of the volume flow rate. The number of revolutions of the turbine wheel is the basis for the indication of the volume passed through the meter It is designed to measure, memorize and display the volume of a fuel gas that has passed through it 3.1.2 measured quantity volume in cubic metres, at metering conditions 3.1.3 volume flow rate volume at metering conditions divided by time 3.1.4 rangeability ratio between Qmin and Qmax, i.e. the minimum and maximum flow rate respectively for which the meter performs within the maximum permissible errors 3.1.5 average velocity volume flow rate divided by the cross-sectional area of the meter connections 3.1.6 casing pressure containing structure of the meter SIST EN 12261:2018

D
where the value of D is given by the internal pipe diameter. The parameters (variables) in the above equation and their units are defined in Table 1 3.1.11 error of indication indication of a turbine meter minus the reference value of the measurand Note 1 to entry: Errors (E) are expressed as relative values (as a percentage) by the ratio of the difference between the indicated volume (Vi) and a reference volume (Vc) of the gas which has passed through the gas meter to this latter value: ⋅⋅icc100[%]
VVE =
V 3.1.12 pressure loss non-recoverable pressure drop caused by the presence of the turbine meter in the conduit 3.1.13 pulse value number of pulses per cubic metre indicated 3.1.14 gas families 3.1.14.1 1st family gas having a Wobbe index between: 23,8 MJ b m-3 and
u sá v MJ b m-3 according to EN 437 related on gross calorific value 3.1.14.2 2nd family gas having a Wobbe index between:
v sá u MJ b m-3 and
w yá { MJ b m-3 according to EN 437 related on gross calorific value 3.1.15 class 1,0 meter meter which has an error of indication between –2% an + 2% for flow rates Q where Qmin < Q < Qt, -1 % and +1 % for flow rates Q where Qt < Q < Qmax and when the errors between Qt and Qmax all have the same sign, they do all not exceed 0,5 % SIST EN 12261:2018

Kinematic viscosity m2 b s -1
Density of the gas kg b m –3 Subscripts:
i Summation index
m Metering conditions of the gas
max Maximum value
min Minimum value
s Specified conditions
t Transitional
4 Meter classification 4.1 Flange pressure ratings Flanges shall be designed according to PN Designation or ANSI class rating (see Table 2). Table 2 — Flange pressure ratings PN Designation ANSI class rating 10 125 16 - 20 150 25 - 40 - 50 300 64 - 100 - 110 600 150 900 250 - 260 1 500 420 2 500 NOTE This table is based on EN 1333 resp. ISO 7005-1. SIST EN 12261:2018

The use of the following pressure ratings is recommended: 10 - 16 - 20 - 25 - 40 - 50 - 100 - 150 - 250 - 420. 4.2 Gas meter sizes, rangeability and connection diameter sizes Gas meters shall be classified as class 1,0 with the maximum and minimum flow rates and nominal diameters as shown in Table 3. The maximum and minimum flow rates shall be specified for the gas density for which the meter will operate within the specifications of meter performance defined in Clause 5. NOTE The maximum flow rate in cubic meters per hour (m3/h) is a number in R 5 of the sets of preferred numbers listed in ISO 3 (the value of 63 has been rounded to 65). Table 3 — Authorized values of maximum flow rates, corresponding minimum flow rates and nominal diameters
Rangeability Nominal diameters DN
1:20 1:30 1:50
Qmin (m3/h)
Qmax
A B C (m3/h)
2 1,3 0,8 25
50 65
3 2 1,3
5 3 2
50 80 160
8 5 3 50 80 100 250
13 8 5
80 100 400
20 13 8 80 100 150 650
32 20 13 100 150
1 000
50 32 20
150 200 1 600
80 50 32 150 200 250 2 500
130 80 50 200 250 300 4 000
200 130 80 250 300 400 6 500
320 200 130 300 400
10 000
500 320 200 400 500
16 000
800 500 320 500 600
25 000
1 300 800 500 600 750
Rangeability Nominal diameters DN
1:20 1:30 1:50
Qmin (m3/h)
Qmax
A B C (m3/h)
A
high speed version B
normal speed version (preferred) C
low speed version 4.3 Connections and dimensions The inlet and outlet of the meter shall have the same nominal diameter and connection type. The preferred overall length in millimetres of the meter between inlet and outlet connections is 3 DN. Tolerances are given in EN 22768-1:1993, “Designation c“. The preferred length in millimetres of 3 DN for the meter shall not be exceeded. For shorter meters the manufacturer shall be able to provide a “make up spool piece“ to bring their body lengths up to the preferred length, where requested. The maximum overall distance in millimetres measured from the extremity of the protruding parts to the meter axis should not exceed 150 plus 1,5 DN. For flange connections refer to Table 2. 4.4 Temperature ranges The gas and the ambient temperature ranges for which the meter is designed to perform within the standard performance specification shall be stated. 4.5 Climatic environment The climatic environment ranges for which the meter is designed to perform within the standard performance specification shall be stated. 5 Metrological performance requirements 5.1 General Each type of meter shall be subjected to the series of tests specified in 5.2 to establish the metrological performance of the type of meter. If one type of meter comprises a range of sizes of the same basic design and a range of metering conditions, the type test may be performed on a limited number of sample meters (1 to 6 samples irrespective of size) being representative for that range of meter sizes and metering conditions. Each meter conforming to an approved type shall be tested individually according to Annex E. The results of the tests obtained in 5.2 and Annex E shall be available on request together with a statement of the conditions under which the test took place. The meter shall be fitted with all components which may affect the metrological performance. General requirements for the test facility to be used for the type test are given in Annex A. SIST EN 12261:2018

¶ Q < Qt ± 2 % Qt
¶ Q
¶ Qmax ± 1 % Table 5 — Transitional flow rate Qt Rangeability Qt 1 : 20
rá t r b Qmax 1 : 30
rá s w b Qmax
·
s ã
w r
rá s r b Qmax
In order to ensure that the gas meter does not exploit the MPEs or systematically favour any party, each meter shall be adjusted so that the weighted mean error (WME) is as close to zero as the adjustment and the maximum permissible errors will allow. The WME shall have a value between -0,4 % and +0,4 %. The WME is calculated as follows: ∑⋅∑iiiWME=maxmax//QQEQQ where Qi / Qmax
is a weighting factor; Ei
is the error of indication at the flow rate Qi given as a percentage. When Qi = Qmax a weighting factor of 0,4 instead of 1 shall be used. SIST EN 12261:2018

rá t w b Qmax and Qmax shall not exceed 0,5 % for meters with DN > 100 or 1,0 % for meters with DN
¶
s r rä If a meter has been certified for one working pressure range it is deemed to be certified for any smaller working pressure range. If a meter is certified for one rangeability it is deemed to be certified for any lower rangeability. 5.2.1.2 Test Before type testing, a meter shall undergo a run-in-period of 50 hours at a flow rate of at least
rá w b Qmax. The test consists of determining the error of indication of the complete meter at the flow rates given in Table 6. For a meter type specified for measurement in a pressure range below or equal to 4 bar the error of indication test shall be carried out with a gas at atmospheric conditions (± 100 mbar). For a meter type specified for measurement in a pressure range extended above 4 bar the error of indication test shall be carried out with a gas in the range of the specified metering conditions. The tests shall be carried out at least at the lowest and the highest working pressure specified by the manufacturer. However, for specified maximum pressures above 50 bar a test at 50 bar is deemed acceptable. Table 6 — Test flow rates in % of Qmax Rangeability 1 : 10 1 : 20 1 : 30 1 : 50
5 5 5
10 10
25 25 25
40 40 40
70 70 70
100 100 100
5.2.2 Metrological stability 5.2.2.1 Requirements In the flow rate range from 0,25 b Qmax to Qmax the variation of the error of indication of the meter at each flow rate shall stay within a span of 0,2 %. SIST EN 12261:2018

rá t w b Qmaxá
rá y r b Qmax,
rá v r b Qmax, Qmaxá where the change from
rá v b Qmax to Qmax is done via
sá s r b Qmax, in order to approach Qmax from a higher flow rate. At each flow rate the error shall be determined three times without changing the flow rate. The cycle shall be repeated three times. The test shall be carried out with a gas at atmospheric conditions (± 100 mbar) or at the lowest pressure designated on the meter. The nine resulting errors of indication at each flow rate shall be within a span of 0,2 %. 5.2.3 Linearity 5.2.3.1 Requirements For the test flow rates from 0,25 b Qmax to Qmax at each test pressure the differences between the highest and the lowest error of indication shall not exceed the values specified in Table 7. Table 7 — Allowable differences between the highest and lowest error of indication at each test pressure Size Pressure < 4 bar > 4 bar < DN 100 1,0 % 0,5 % > DN 100 1,0 % 0,3 %
5.2.3.2 Test In order to determine if the linearity requirement is fulfilled the value of the errors found at each flow rate according to 5.2.1.2 shall be taken. 5.2.4 Endurance 5.2.4.1 Requirements Meters shall retain the accuracy of their metrological characteristics, within defined limits, over their expected life. To prove this the meters shall undergo an endurance test. The difference in error of indication between the start and end of the test shall be less than one third of the maximum permissible error given in Table 4. After the test, the error of indication shall not exceed the maximum permissible error given in Table 4. 5.2.4.2 Test One to six sample meters of each type irrespective of size shall be used for the endurance test. Meters shall be tested with their indicating devices fitted. The duration of the test shall be such that each meter measures a volume corresponding to 1 000 h of operation of the meter at the maximum flow rate; the test shall be completed within 2 months. SIST EN 12261:2018

s hour testá the error of indication
...