oSIST prEN 15834:2008
(Main)Refrigerating systems and heat pumps - Qualification of tightness of components and joints
Refrigerating systems and heat pumps - Qualification of tightness of components and joints
This document is intended to describe the qualification procedure of the tightness of static components used in the refrigerating industry and fixed air conditioning. The static components concerned are, in particular, the fittings the bursting discs, the flanged or fitted assemblies. This document is intended to characterise their tightness, stresses met during their operations, following the fitting procedure specified by the manufacturer, and to specify the minimal list of operation to be provided by the supplier of a component to the person in charge of carrying out this procedure. It specifies the maximal leakage of the component. It applies to the static components used in the refrigerating installations, including those with seals, whatever their material and design are.
Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und Verbindungen
Das vorliegende Dokument soll als Beschreibung des Verfahrens zur Qualifizierung der Dichtheit von hermetisch dichten und geschlossenen Bauteilen, Verbindungen und Teilen dienen, die in der Kühlindustrie und bei fest eingebauten Klimaanlagen Anwendung finden. Bei den behandelten dichten und geschlossenen Bauteilen, Verbindungen und Teilen handelt es sich insbesondere um Fittings, Berstscheiben sowie geflanschte oder mit Verbindungsstücken hergestellte Baugruppen. Die Dichtheit von flexiblen Rohrleitungen aus nichtmetallischen Werkstoffen wird in der prEN 1736 behandelt. Flexible Rohrleitungen aus Metall werden von der vorliegenden Norm abgedeckt.
Dieses Dokument ist dafür vorgesehen, deren Dichtheit und die im Betrieb bei Befolgung des durch den Hersteller festgelegten Verfahrens des Zusammenbaus auftretenden Beanspruchungen zu charakterisieren sowie die Liste der Informationen festzulegen, die der für die Durchführung dieses Verfahrens verantwort¬lichen Person durch den Lieferanten eines Bauteils mindestens bereitzustellen sind.
Das vorliegende Dokument legt den Grad der Dichtheit des Bauteils als Ganzes sowie dessen durch den Hersteller festgelegten Zusammenbau fest.
Es ist auf die in kältetechnischen Einrichtungen angewendeten hermetisch dichten und geschlossenen Bauteile, Verbindungen und Teile anwendbar, einschließlich der mit Dichtungen versehenen, unabhängig von deren Werkstoff und Auslegung.
Das vorliegende Dokument legt zusätzliche Anforderungen an mechanische Verbindungen fest, die als hermetisch dichte Verbindungen anerkannt werden können.
Systèmes de réfrigération et pompes à chaleur - Qualification de l'étanchéité des composants et des joints
Le présent document a pour objet de décrire la procédure de qualification de l’étanchéité des composants, joints et éléments hermétiquement scellés et fermés, utilisés dans les industries du froid et de la climatisation fixe. Les composants, joints et éléments scellés et fermés concernés sont, notamment, les raccords, les disques de rupture ou d’éclatement, les assemblages à bride ou à raccord. L’étanchéité des flexibles en matériaux non métalliques est traitée dans le prEN 1736. Les flexibles métalliques sont couverts par la présente norme.
Le présent document est destiné à caractériser leur étanchéité, les contraintes rencontrées pendant leur fonctionnement, en suivant la procédure de montage spécifiée par le fabricant et à spécifier la liste minimale des informations nécessaires à donner par le fournisseur d’un composant à la personne chargée de mettre en œuvre cette procédure.
Il spécifie le niveau d’étanchéité du composant, dans son ensemble, ainsi que son assemblage spécifié par son fabricant.
Il est applicable aux composants, joints et éléments scellés et fermés utilisés dans les installations frigorifiques, y compris ceux avec joints d’étanchéité, indépendamment de leur matière et de leur conception.
Le présent document spécifie des exigences supplémentaires concernant les joints mécaniques susceptibles d’être considérés comme des joints hermétiquement scellés.
Hladilni sistemi in toplotne črpalke - Ocena tesnosti sestavnih delov in spojev
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 15834:2008
01-oktober-2008
+ODGLOQLVLVWHPLLQWRSORWQHþUSDONH2FHQDWHVQRVWLVHVWDYQLKGHORYLQVSRMHY
Refrigerating systems and heat pumps - Qualification of tightness of components and
joints
Kälteanlagen und Wärmepumpen - Qualifizierung der Dichtheit der Bauteile und
Verbindungen
Ta slovenski standard je istoveten z: prEN 15834
ICS:
27.080 7RSORWQHþUSDONH Heat pumps
27.200 Hladilna tehnologija Refrigerating technology
oSIST prEN 15834:2008 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 15834:2008
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oSIST prEN 15834:2008
EUROPEAN STANDARD
DRAFT
prEN 15834
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2008
ICS 27.080; 27.200
English Version
Refrigerating systems and heat pumps - Qualification of
tightness of components and joints
Kälteanlagen und Wärmepumpen - Qualifizierung der
Dichtheit der Bauteile und Verbindungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 182.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15834:2008: E
worldwide for CEN national Members.
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oSIST prEN 15834:2008
prEN 15834:2008 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Symbols .5
5 Test requirements.6
6 Requirements for hermetically sealed systems .11
7 Test procedures.11
7.1 General.11
7.2 Sampling.11
7.3 Test temperature.11
7.4 Tightness test.12
7.4.1 Tightness control level.13
7.5 Requirements for joints .15
7.5.1 General conditions .15
7.6 Pressure temperature vibration tests (PTV) .16
7.6.1 General.16
7.6.2 Samples .16
7.6.3 Test method.16
7.6.4 Method 1: combined pressure temperature cycle test with integrated vibration test.17
7.6.5 Method 2: combined pressure temperature cycle test with a separate vibration test. .19
7.7 Operation simulation.25
7.8 Freezing test.26
7.9 Additional pressure test for hermetically sealed joints.27
7.10 Vacuum Test.27
7.11 Compatibility Screening Test .27
7.11.1 General.27
7.11.2 Test fluids.28
7.11.3 Test specimens.28
7.11.4 Test setup parameters .28
7.11.5 Tests procedure.28
7.11.6 Pass/fail criteria for sealing elements .29
7.12 Fatigue test for hermetically sealed joints.31
8 Test report .31
9 Information to the user.31
Annex A (informative) Component-joint test arrangements .32
Annex B (normative) Equivalent tightness control levels.34
B.1 Calculation models.34
B.2 From volumetric flow to mass flow.35
B.3 Tightness control level stated as bubbles of air in unit time:.37
Bibliography .40
2
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oSIST prEN 15834:2008
prEN 15834:2008 (E)
Foreword
This document (prEN 15834:2008) has been prepared by Technical Committee CEN/TC 182 “Refrigerating systems,
safety and environmental requirements”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
3
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oSIST prEN 15834:2008
prEN 15834:2008 (E)
1 Scope
This document is intended to describe the qualification procedure of the tightness of hermetically sealed and closed
components, joints and parts used in the refrigerating industry and fixed air conditioning. The sealed and closed
components, joints and parts concerned are, in particular, the fittings, the bursting discs, the flanged or fitted
assemblies. The tightness of flexible piping made from non metallic materials is dealt with in prEN 1736. Metal
flexible piping are covered by this standard.
This document is intended to characterise their tightness, stresses met during their operations, following the fitting
procedure specified by the manufacturer, and to specify the minimal list of necessary information to be provided by
the supplier of a component to the person in charge of carrying out this procedure.
It specifies the level of tightness of the component, as a whole, and its assembly as specified by its manufacturer.
It applies to the hermetically sealed and closed components, joints and parts used in the refrigerating installations,
including those with seals, whatever their material and their design are.
This document specifies additional requirements for mechanical joints that can be recognised as hermetically sealed
joints.
2 Normative references
The following references 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, Refrigerating systems and heat pumps — Safety and environmental requirements — Part 1: Basic
requirements, definitions, classification and selection criteria.
EN 1330-8, Non destructive testing — Terminology — Part 8: Terms used in leak tightness testing.
prEN 1736, Refrigerating systems and heat pumps — Flexible pipe elements, vibration isolators, expansion joints
and non-metallic tubes — Requirements, design and installation.
EN 1779, Non-destructive testing — Leak testing — Criteria for method and technique selection.
EN 12263, Refrigerating systems and heat pumps — Safety switching devices for limiting the pressure —
Requirements and test.
EN 13185, Non6destrcutive testing — Leak testing — Tracer gas method.
IEC 60068-2-6, Environmental testing — Part 2: Tests — Tests Fc: Vibration (sinusoidal).
IEC 60068-2-64, Environmental testing — Part 2 Test methods — Test Fh: Vibration, broad-band random (digital
control) and guidance.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1330-8 and EN 378-1 and the following
apply.
3.1
maximal flow rate, Q
max
value of the maximal leak flow rate at any point of the component, expressed in grams per year, at PS
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3.2
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 grams per year under a pressure of at least a quarter of the maximum
allowable pressure
NOTE Sealed systems as defined in prEN 378-1(2007) equal hermetically sealed systems.
3.3
product family
group of products that have the same function, same technology, and same material for each functional part and
sealing materials
3.4
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. flare joint).
4 Symbols
Dk percentage deviation of the minimum and maximum torque from the average of the minimum and
rel
maximum torque, (K – K )/(K + K )
o,max o,min o,min o,max
f (Hz) frequency of vibrations
K average torques of the respective joint standard
o,ave
K required maximum torques of the respective joint standard, if specified. Otherwise, the maximum
o,max
torque values supplied by the manufacturer.
K required minimum torques of the respective joint standard, if specified. Otherwise, the minimum
o,min
torque values supplied by the manufacturer.
L (mm) length of tube.
n number of cycles in temperature and in pressure
n total number of cycles in temperature and in pressure
total
N number of samples
P (bar) tightness test pressure
P (bar) maximal pressure of cycle
max
P (bar) minimal pressure of cycle
min
PS (bar) maximal working pressure
P (bar) nominal set pressure of the device
set
Q (g/yr) maximal flow rate
max
s (mm) vibration displacement (peak to peak value)
T (°C) maximal temperature of cycle
max
T (°C) minimal temperature of cycle
min
5
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oSIST prEN 15834:2008
prEN 15834:2008 (E)
5 Test requirements
The required tests to be applied to components and joints used in refrigerating systems and heat pumps are given in
Table 2 and in Table 3.
The following Figures show the principle of a component and a joint and their corresponding requirements in Table 2
or Table 3.
According to Table 2
According to Table 2
According to Table 3
Key
1 joint
2 component
3 pipe
4 component-joint
5 extension pipe
Figure 1 — Principle: component-joint
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prEN 15834:2008 (E)
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
component according to Table 2. The other possible types of joints shall be tested independently according to Table
3.
EXAMPLE A component having four types of joints shall be tested with the following sequence:
Table 1 — Test sequence for component and its different combinations of joints
Joint type Tests for Test for component type (body)
joints (if not
tested with
I II III IV
the body)
(e.g. solenoid) (e.g. (e.g. hand (……)
expansion operated
valve) valve)
A (e.g. brazing) Yes the
manufacturer
shall chose
B (e.g. flare) Yes
the the the
one type of
manufacturer manufacturer manufacturer
joint
C (e.g. screw connection Yes shall chose shall chose shall chose
one type of one type of one type of
joint joint joint
D (e.g. welding) yes
E (…….) yes
7
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Table 2 — Requirements for components
Requirements
PTV- test Additional test for
Chemical
tightness
hermetically sealed
Operation Freezing compatibility
test Vacuum test
(pressure-
cycle test with
temperature
Pressure
materials
Fatigue test
-vibration) test
Components (including valves):
Components having only
permanent body joints: brazing
and welding YES NO NO NO NO NO NO NO
Identical base materials
Components having permanent
body joints : brazing and welding
YES YES NO NO NO NO NO NO
Different base materials
Components having other YES YES
permanent body joints : e.g. glue, if operating if non
YES YES NO YES YES YES
permanent compression fittings, temperature metallic
o
expansion joints below 0 C parts
YES
if any
external
YES YES
stems, shaft
Components with non if operating if non Not Not
YES YES seals or YES
permanent body joints temperature metallic applicable applicable
removable o
below 0 C parts
or
replaceable
parts
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Table 2 (continued)
Requirements
PTV- test Additional test for
Chemical
tightness
hermetically sealed
Operation Freezing compatibility
test Vacuum test
(pressure-
cycle test with
temperature
Pressure
materials
Fatigue test
-vibration) test
YES YES
Capped valves and capped
if operating if non
service ports for hermetically YES YES YES YES YES YES
temperature metallic
sealed systems
o
below 0 C parts
YES
if non Not Not Not
Safety valves YES YES NO NO
metallic applicable applicable applicable
parts
Flexible piping Test according to EN 1736
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Table 3 — Requirements for the joining of components
Requirements
PTV- test Additional test for
Chemical
tightness
hermetically sealed
Operation Freezing compatibility
test Vacuum test
(pressure-
cycle test with
temperature
Pressure
materials
Fatigue test
-vibration) test
Joints and parts:
Permanent piping joints: brazing
and welding
YES NO NO NO NO NO NO NO
Identical base materials
Permanent piping joints: brazing
and welding
YES YES NO NO NO NO NO NO
Different base materials
Other permanent piping joints :
e.g. glue, permanent compression YES YES NO YES YES YES YES YES
fittings, expansion joints
YES, if Not Not
Non permanent piping joints YES YES YES YES sealing YES applicable applicable
material
Not Not
Gaskets and sealing NO NO NO NO YES NO applicable applicable
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oSIST prEN 15834:2008
prEN 15834:2008 (E)
6 Requirements for hermetically sealed systems
Hermetically sealed systems shall be constructed with components which have their tightness control level qualified
as A1 or A2 as per Table 4. These components and joints shall be submitted to the relevant tests as specified in
table 2 and 3.
7 Test procedures
7.1 General
The test characteristics to be applied to the components, joints and parts shall pass the qualification test. The test
procedures are shown in Figure 2.
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 test7.6) and for operation
simulation (7.7) shall be the same. For each of the other tests (7.8, 7.9, 7.10, 7.11, 712), 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.
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7.4 Tightness test
The components shall be tightness tested.
For pressure relief devices, P ≥ 0,9 × P
tightness set
For all other components and P ≥ 1,0 × PS (PS = Rated Max. working pressure of the
tightness
joints component)
Q ≤ requirements for actual tightness control level A1 – A2
tightness(I)
(hermetically sealed components) or B1– B3 for all other
components
o
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 B)
The maximum tightness control depends of the size of the tested component. In Table 4, the components are divided
into tightness control levels.
Table 4 — Tightness control level according to component volume
Joints Component
Tightness
[DN]
Components control
Volume
levels
[litre]
≤ 50 0 up to 1,0 A1
Hermetically sealed components
> 50 > 1,0 A2
Closed components ≤ 50 0 up to 2,0 B1
Closed components > 50 > 2,0 up to 5,0 B2
Closed components - > 5,0 up to 20,0 B3
Closed components - > 20,0 B4
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The required tightness control level is stated in Table 5. The manufacturer can choose more stringent tightness
control level if adequate.
Table 5 — Equivalence of test gas flow according to tightness control levels
Q
he-ref
Equivalent Equivalent
helium
air leak (Q iso-butane
air-
Component Tightness reference
o
o ) +20 C, leak (m )
ref R600a
type control level leak +20 C,
o
10 bar +20 C, 10
10 bar
[mbar × l /s] bar [g/yr]
[mbar × l /s]
-6 -6
A1 ≤ 7,5 × 10 ≤ 8 × 10 ≤ 1,5
Hermetically
-5 -6
sealed
A2 ≤ 1 × 10 ≤ 11 × 10 ≤ 2,0
-5 -6
B1 ≤ 1 × 10 ≤ 11 × 10 ≤ 2,0
-5 -5
B2 ≤ 2 × 10 ≤ 2,1 × 10 ≤ 4,0
Closed
-5 -5
a
≤ 5,4 × 10 ≤ 10
B3 ≤ 5 × 10
-4 -5
a
B4 ≤ 1 × 10 ≤ 11 *×10 ≤ 20
a
Components specified for HFC’s individual leak shall not exceed 5 g/yr of HFC’s.
o
NOTE The equivalent iso-butane leak is calculated as gas. At +20 C and 10 bar iso-butane
is in the liquid phase.
7.4.1 Tightness control level
7.4.1.1 Test method
The tightness control level of joints and components shown in Figure 3 shall be measured by an integration
measured method (the sum of all leaks).
It is preferable to use tracer gas technique as defined in EN 13185 Group B, (tracer gas flowing out of object).
Tracer gas is admitted to the internal volume oh the object and it is collected and detected a vacuum chamber.
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 trace gas pressure generator (in the vacuum chamber) see draw below;
close the vacuum box and start the leak detector (and if it is need add a vacuum pump);
adjust and calibrate the leak detector according to EN 13185, 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 (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, 9.2.6.
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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
7.4.1.2 Alternative test methods
Two alternative methods may be applied.
Alternative method 1:
The control by pressure technique by accumulation (B3) could be a method to measure the leak rate of the
component (see 10.4.1 Pressure technique by accumulation B3 in EN 13185).
Alternative method 2:
Bubble test methods shown in Figure 4 can be acceptable for tightness control B, provided that the actual
method is capable to measure the actual leakage rate. 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:
the test object shall be subjected to an inside air pressure ≥ PS (maximum working pressure). Reduced
pressure is not acceptable,
the test object shall be immersed in water,
the test object shall be subjected to normal atmospheric pressure on the outside,
the test shall be performed at normal ambient temperature,
the period of time between bubbles leaving the test object shall be more than 60 sec.
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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 General conditions
7.5.1.1 Test samples
All joints tested shall be tested in the final form (as the customer receives the part).
All joints shall to be submitted to the tests as indicated in Table 3.
7.5.1.2 Torque
Tube joints shall be tested both at the minimum torque K and the maximum torque K defined in Table 6.
min max
Table 6 — Torque for the test, K and K
min max
K K
min max
IF DK > or = 20% K K
rel o,min o,max
IF 20% > DK 0,8 × K 1,2 × K
rel o,ave o,ave
7.5.1.3 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 K specified in Table 6,
max
b) Loosen the joints and take the tubes completely apart,
c) Repeat a) and b) four more times.
7.5.1.4 Requirements for hermetically sealed joints
The joint cannot be opened without the use of special tools.
NOTE Special tools are other than screw-drivers, parallel wrenches, simple gripping tool, etc.
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prEN 15834:2008 (E)
The joint shall not be reusable without replacing the sealing material in general procedure. 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.
7.6 Pressure temperature vibration tests (PTV)
7.6.1 General
For pressure temperature vibration tests, method 1 or method 2 as described as follows shall be applied.
The components or joints shall comply with one of the two methods described in 7.6.4 and 7.6.5 for combined cycle
testing in order to qualify the tightness control level.
The maximum size of component to be tested to Method 1, see 7.6.4, shall not exceed DN 100.
7.6.2 Samples
For the combined cycle test, the number of samples is determined based on tightness control level according to
Table 7.
Table 7 — Test parameters
Number of
tightness control level
samples
A1, B1 3
A2, B2 2
Other levels 1
7.6.3 Test method
7.6.3.1 Equipment
Test equipment shall be composed of:
a) A regulated enclosure for environment tests, able to maintain temperatures varying regularly between T
min
and T ;
max
b) A pressure device, connected to the five joints, capable of producing a pressures that vary between P and
min
P ;
max
c) A vibration generator, to make the specified frequency and amplitude;
d) A pressure control system capable to control the pressure with an accuracy of ± 5%;
e) A temperature control system capable of controlling the temperature inside of the test enclosure with an
accuracy of ± 5 °C;
f) A Thermocouple capable to monitor the temperature (T , T ) of the component or joint submitted to the
max min
test.
The temperature sensor shall be adhered to the surface of the sample on the item with the biggest weight
concentration of the pressure bearing part in order to assure that the sample has reached the defined
temperature values. Where the pressure bearing part is made from metallic and non metallic materials, the
sensor shall be fixed on the non metallic material.
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The sensor can be fixed to the sample by soldering or with adhesives, whichever is more appropriate,
depending on the material of the sample.
Another method, proven to have the same performance as the thermocouple can be applied.
g) A cycle counter of temperature and pressure;
h) Test equipment to perform tightness test according to 7.4.
7.6.3.2 Test arrangements
The test items (components and/or joints) shall be mounted as shown in Figure Y, in accordance with the number of
joints to be tested and with the dimension of the climatic enclosure in which the tests are carried out.
The tube section shall have a diameter and dimensional tolerances such as specified by the manufacturer of the
joint, see Annex A.
The assembly of the joints on the tube shall be carried out following the fitting instructions of the manufacturer.
For pressure test, one end of a tube shall be connected to the pressure generator; the other end shall be tightly
closed.
7.6.4 Method 1: combined pressure temperature cycle test with integrated vibration test.
The samples, (joints fitted on a tube) shall be submitted to a defined number n of cycles of temperature and
pressure, between maximal values (T , P ) and minimal values (T , P ).
max max min min
The test characteristics to be applied to the components according to the Table 8 are given in the Figure 4.
A typical temperature-pressure cycle is given in Figure 5.
Principle PTV-test method 1
Key
1 temperature
2 pressure
3 vibration
Principle: PTV-test method 2
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Key
1 temperature
2 pressure
3 vibration
4 frequency displacement
Figure 5 — Temperature-pressure cycle
Table 8 — Test parameters
Parameters Value
n 160
n 5 × n
total
Minimum temperature as specified by the
T
min
manufacturer or -40 °C if this is not specified
Maximu
...
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