EN 16084:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kälteanlangen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und VerbindungenSystèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des composants et jointsRefrigerating systems and heat pumps - Qualification of tightness of components and joints27.200Hladilna tehnologijaRefrigerating technology27.080Heat pumpsICS:Ta slovenski standard je istoveten z:EN 16084:2011SIST EN 16084:2011en,fr,de01-oktober-2011SIST EN 16084:2011SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16084
April 2011 ICS 27.080; 27.200 English Version
Refrigerating systems and heat pumps - Qualification of tightness of components and joints
Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des composants et des joints Kälteanlangen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und Verbindungen This European Standard was approved by CEN on 20 February 2011.
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 bibliographical 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 responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
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Equivalent tightness control levels . 31A.1Calculation models . 31A.2From volumetric flow to mass flow. 32A.3Tightness control level stated as bubbles of air in unit time . 34Annex B (informative)
Test arrangements . 37Bibliography . 38 SIST EN 16084:2011

This European Standard specifies additional requirements for mechanical joints that can be recognised as hermetically sealed joints. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 378-1:2008, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 1: Basic requirements, definitions, classification and selection criteria EN 1330-8:1998, Non-destructive testing — Terminology — Part 8: Terms used in leak tightness testing EN 1593, Non-destructive testing — Leak testing — Bubble emission techniques EN 1736, Refrigerating systems and heat pumps — Flexible pipe elements, vibration isolators, expansion joints and non-metallic tubes — Requirements, design and installation EN 12284, Refrigerating systems and heat pumps — Valves — Requirements, testing and marking EN 12693, Refrigerating systems and heat pumps — Safety and environmental requirements — Positive displacement refrigerant compressors EN 13134, Brazing — Procedure approval EN 13185:2001, Non-destructive testing — Leak testing — Tracer gas method EN 60068-2-6, Environmental testing — Part 2-6: Tests — Tests Fc: Vibration (sinusoidal) (IEC 60068-2-6:2007) EN 60068-2-64, Environmental testing — Part 2-64: Tests — Test Fh: Vibration, broadband random and guidance (IEC 60068-2-64:2008) EN 60335-2-34, Household and similar electrical appliances — Safety — Part 2-34: Particular requirements for motor-compressors (IEC 60335-2-34:2002) SIST EN 16084:2011

NOTE The mass flow rate is expressed in grams (g) per year. 3.2 volume flow rate
Q value of the leak volume flow rate at any point of the component
NOTE The volume flow rate is expressed in pascal cubic metres per second (Pa·m³/s). 3.3 hermetically sealed system system in which all refrigerant containing parts are made tight by welding, brazing or a similar permanent connection which may include capped valves and capped service ports that allow proper repair or disposal and which have a tested tightness control level of less than 3 g per year under a pressure of at least a quarter of the maximum allowable pressure NOTE Sealed systems as defined in EN 378-1:2008 equal hermetically sealed systems. 3.4 product family group of products that have the same function, same technology, and same material for each functional part and sealing materials 3.5 permanent joints means joints which cannot be disconnected except by destructive methods [Adapted from the Pressure Equipment Directive 97/23/EC] 3.6 reusable joint joint made without replacing the sealing material in general procedure NOTE In some cases the tube is used as sealing material (e.g. flared joint). 3.7 same base material material belonging to the same group as follows:  steel group;  aluminium and aluminium alloy group; or  copper group NOTE Subgroups of these material groups are considered to be same base materials (refer to EN 14276-2). SIST EN 16084:2011

f Frequency of vibrations Hz Kave Average torques of the respective joint standard Nm Kmax Required maximum torques of the respective joint standard, if specified. Otherwise, the maximum torque values supplied by the manufacturer. Nm Kmin Required minimum torques of the respective joint standard, if specified. Otherwise, the minimum torque values supplied by the manufacturer. Nm L Length of tube mm n Number of cycles in temperature and in pressure (method 1)
n1 Number of cycles in temperature and in pressure (method 2)
n2 Number of cycles in pressure
n3 Number of cycles in vibration
ntotal Total number of cycles in temperature and in pressure
N Number of samples
P Tightness test pressure bar Pmax Maximal pressure of cycle bar Pmin Minimal pressure of cycle bar PS Maximal allowable pressure bar Pset Nominal set pressure of the device bar Q Volume flow rate Pa·m3/s Qm Mass flow rate g/yr s Vibration displacement (peak to peak value) mm Tmax Maximal temperature of cycle °C Tmin Minimal temperature of cycle °C SIST EN 16084:2011

a) According to Table 2
b) According to Table 2
c) According to Table 3 Key 1 joint 2 component body 3 pipe 4 component body joint 5 extension pipe Figure 1 — Principle: component body-joint All component types and joints types shall be tested. When a component may be connected with different types of joints, one of these joints shall be tested with the component according to Table 2. The other possible types of joints shall be tested independently according to Table 3. SIST EN 16084:2011

Components (including valves): Requirements Tightness test 7.4 PTV- test (pressure-temperature-vibration) 7.6 Operation simulation 7.7 Freezing test 7.8 Chemical compatibility with materials 7.11 Vacuum test7.10 Additional test for hermetically sealed Pressure test 7.9 Fatigue test 7.12 Component bodies having only permanent body joints: brazing and welding Identical base materials YES NO NO
NO NO NO NO NO Components having permanent body joints: brazing and welding Different base materials YES YES a
NO NO NO NO NO NO Component bodies having other permanent body joints: e.g. glue, permanent compression fittings, expansion joints YES YES NO YES if operating temperature below 0 °C YES if non metallic parts YES YES YES Component bodies with non permanent body joints
YES YES YES if any external stems, shaft seals or removable or replaceable parts YES if operating temperature below 0 °C YES if non metallic parts YES Not applicable Not applicable a PTV tests are not required if destructive and non destructive tests of EN 13134 are carried out. SIST EN 16084:2011

Joints and parts Requirements Tightness test 7.4 PTV- test
(pressure-temperature-vibration) 7.6 Operation simulation 7.7 Freezing test 7.8 Chemical compatibility with materials 7.11 Vacuum test7.10 Additional test for hermetically sealed Pressure test 7.9 Fatigue test 7.12 Permanent piping joints: brazing and welding Identical base materials YES NO NO NO NO NO NO NO Permanent piping joints: brazing and welding Different base materials YES YES NO NO NO NO NO NO Other permanent piping joints: e.g. glue, permanent compression fittings, expansion joints YES YES NO YES YES YES YES YES Non permanent piping joints YES YES YES YES YES, if sealing material YES Not applicable Not applicable Gaskets and sealing NO NO NO NO YES NO Not applicable Not applicable
Figure 2 — Test procedure 7.2 Sampling The largest, the smallest and any random samples in between of the product family shall be submitted to the test as required in Table 2 or Table 3. The samples used for pressure-temperature vibration test (7.6) and for operation simulation (7.7) shall be the same. For each of the other tests (7.8, 7.9, 7.10, 7.11, 7.12), different samples may be used. 7.3 Test temperature Test temperature (ambient and gas) shall be 15 °C to 35 °C, unless otherwise specified as the test conditions. SIST EN 16084:2011

Q
≤ requirements for actual tightness control level A1 – A2 (hermetically sealed components) or B1 – B2 for all other components. The maximum required tightness control level are specified for Helium at 10 bar and + 20 °C as a reference. The actual tightness control levels can be calculated (e.g. other test fluids or pressures) by using the stated calculation formulas (Annex A). The maximum tightness control level depends on the size of the tested component or joint. Tightness control levels are specified in accordance with the joints used in Table 4. These are levels for each individual joint. Table 4 — Tightness control level according to joints nominal diameter
Joints
DN Tightness control levels Hermetically sealed joints≤ 50 A1 Closed joints ≤ 50 B1
For components, the tightness control level depends on the component internal volume and the type of component as specified in Table 5. These are levels for each individual component. Table 5 — Tightness control level according to components volume
Components Component Volume l Tightness control levels Hermetically sealed components0 up to 1,0 A1 > 1,0 A2 Closed components 0 up to 2,0 B1 Closed components > 2,0 up to 5,0 B2
The required tightness control level is stated in Table 5. The manufacturer can choose more stringent tightness control level if adequate. SIST EN 16084:2011

Component type Tightness control level Qhe-ref helium reference leak +20 °C, 10 bar Pa·m3/s Equivalent air leak (Qair-ref)
+20 °C, 10 bar Pa·m3/s Equivalent
iso-butane leak (mR600a) +20 °C,
10 bar
g/yr Hermetically sealed A1 ≤ 7,5 × 10-7 ≤ 8 × 10-7 ≤ 1,5 A2 ≤ 1 × 10-6 ≤ 11 × 10-7 ≤ 2,0 Closed B1 ≤ 1 × 10-6 ≤ 11 × 10-7 ≤ 2,0 B2 ≤ 2 × 10-6 ≤ 2,1 × 10-6 ≤ 4,0 NOTE The equivalent iso-butane leak is calculated as gas. At +20 °C and 10 bar iso-butane is in the liquid phase. See R600a in Table A.1.
7.4.2 Tightness control level NOTE EN 1779 gives guidance on the criteria for method and technique selection. 7.4.2.1 Test method The tightness control level of joints and components shown in Table 4 and Table 5 shall be measured by the vacuum chamber technique which sum all leak. It is preferable to use tracer gas technique as defined in EN 13185:2001, Clause 10. The component to be tested is pressurised with the tracer gas and placed in the vacuum chamber which measure the sum of all the component’s leak. The following procedure shall be carried out to measure the tightness control level:  connect the vacuum chamber to the detector;  connect the component to the tracer gas pressure generator (in the vacuum chamber) see drawing below;  close the vacuum box and start the leak detector (and if it is needed add a vacuum pump);  adjust and calibrate the leak detector according to EN 13185:2001, 9.1.1;  measure the residual signal in the vacuum box and the component without helium pressure;  adjust the test pressure in the component;  measure the leak signal of the component; NOTE This signal is the total flow of the tracer gas from the component measured by the leak detector.  calculate the leak level according to the formula given in EN 13185:2001, 9.2.6. If joints and/or components are tested together, the total level shall fulfil the most stringent tightness control level of the individual joint or component. SIST EN 16084:2011

Key 1 tracer gas (PS) 2 vacuum 3 vacuum 4 mass spectrometric leak detector 5 test object 6 calibrated leak Figure 3 — Principle of tightness control - tracer gas
7.4.2.2 Alternative test methods Two alternative methods may be applied. a) Alternative method 1: The control by pressure technique by accumulation, in accordance with 10.4.1 of EN 13185:2001, could be a method to measure the leak rate of the component. b) Alternative method 2: Bubble test methods shown in Figure 4 can be acceptable for tightness control level B, provided that the method is capable to measure the actual leakage rate. The bubble test methods shall be carried out in accordance with EN 1593. The accuracy of the selected method shall be verified and be in compliance with the requirements for actual tightness control level. If this method is used, the following requirements shall be applied: 1) the test object shall be subjected to an internal air pressure = PS (maximum allowable pressure). Reduced pressure is not acceptable; 2) the test object shall be immersed in water; 3) the test object shall be exposed to atmospheric pressure; 4) the test shall be performed at normal ambient temperature; 5) the period of time between bubbles leaving the test object shall be more than 60 s. SIST EN 16084:2011

Key 1 water 2 test object 3 air pressure (PS) Figure 4 — Principle of tightness control - Bubble method
7.5 Requirements for joints 7.5.1 Test samples All joints tested shall be tested in the final form as the customer receives the part. All joints shall be submitted to the tests as indicated in Table 3. 7.5.2 Torque Tube joints shall be tested both at the minimum torque Kmin and the maximum torque Kmax defined in Table 7. Table 7— Torque for the test, Kmin and Kmax
Kmin Kmax IF DKrel > or = 20 % Kmin Kmax IF 20 % > DKrel 0,8 × K,ave 1,2 × Kave
7.5.3 Reusable joint If the joints to be tested are reusable, the following steps shall be taken before the test: a) fit the joints to tubes to be connected and tighten the joints to the maximum torque Kmax specified in Table 7; b) loosen the joints and take the tubes completely apart; c) repeat a) and b) four more times. 7.5.4 Requirements for hermetically sealed joints The joint shall not be opened without the use of special tools. NOTE Special tools are other than screw-drivers, parallel wrenches, simple gripping tool, etc. The joint shall not be reusable without replacing the sealing material in normal use. In case the sealing material is the tube, including that the tube is deformed during the sealing process, the deformed part of the tube shall not be reusable for sealing purpose. SIST EN 16084:2011

7.6.3 Test method 7.6.3.1 Equipment
Test equipment shall be composed of: a) regulated enclosure for environment tests, able to maintain temperatures varying regularly between Tmin and Tmax;
b) pressure device, connected to the joints, capable of producing a pressure that varies between Pmin and Pmax;
c) vibration generator, to make the specified frequency and amplitud
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