SIST EN 13555:2005
(Main)Flanges and their joints - Gasket parameters and test procedures relevant to the design rules for gasketed circular flange connections
Flanges and their joints - Gasket parameters and test procedures relevant to the design rules for gasketed circular flange connections
This document specifies the design parameters of gaskets and gasket materials required by EN 1591 1 and pro-vides the test procedures for establishing the values of these parameters for inclusion in ENV 1591 2.
The testing procedures given might be applicable to gaskets of other shapes and dimensions but this shall be indi-cated in the report.
Gaskets which are wholly based upon elastomers, or based upon elastomer with the inclusion of particulate fillers or particulate reinforcement, are beyond the scope of this document.
Flansche und ihre Verbindungen - Dichtungskennwerte und Prüfverfahren für die Anwendung der Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und Dichtungen
Dieses Dokument legt die Kennwerte für die Auslegung von Dichtungen und Dichtungswerkstoffen nach den Anforde-
rungen in EN 1591-1 fest und enthält Prüfverfahren zur Festlegung der entsprechenden Zahlenwerte für die Aufnah-
me in ENV 1591-2.
Diese Prüfverfahren können auch für andere Dichtungsformen und Maße angewendet werden, jedoch muss dies im
Prüfbericht angegeben werden.
Dichtungen auf Elastomer-Basis ohne oder auch mit speziellen Füllstoffen oder Verstärkungen liegen nicht im An-
wendungsbereich dieser Norm.
Brides et leurs assemblages - Parametres de joints et modes opératoires d'essai relatifs aux regles de calcul des assemblages a brides circulaires avec joint
Le présent document définit les parametres de conception des joints et des matériaux d'étanchéité requis par
l?EN 1591-1 et décrit les modes opératoires d?essai permettant de déterminer les valeurs de ces parametres
en vue de les inclure dans l?ENV 1591-2.
Ces modes opératoires d?essai peuvent etre appliqués a des joints de formes et de dimensions différentes
mais cela doit etre indiqué dans le compte rendu.
Les joints entierement fabriqués en matériaux élastomeres ou fabriqués a partir de matériaux élastomeres
additionnés de charges particulaires ou de renforts sous forme de particules, ne relevent pas du domaine
d?application du présent document.
Prirobnice in prirobnični spoji - Parametri tesnil in preskusni postopki, potrebni za načrtovanje okroglih prirobičnih spojev s tesnili
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flansche und ihre Verbindungen - Dichtungskennwerte und Prüfverfahren für die Anwendung der Regeln für die Auslegung von Flanschverbindungen mit runden Flanschen und DichtungenBrides et leurs assemblages - Parametres de joints et modes opératoires d'essai relatifs aux regles de calcul des assemblages a brides circulaires avec jointFlanges and their joints - Gasket parameters and test procedures relevant to the design rules for gasketed circular flange connections23.040.60Prirobnice, oglavki in spojni elementiFlanges, couplings and jointsICS:Ta slovenski standard je istoveten z:EN 13555:2004SIST EN 13555:2005en01-marec-2005SIST EN 13555:2005SLOVENSKI
STANDARD
SIST EN 13555:2005
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13555December 2004ICS 23.040.60; 23.040.80English versionFlanges and their joints - Gasket parameters and testprocedures relevant to the design rules for gasketed circularflange connectionsBrides et leurs assemblages - Paramètres de joints etmodes opératoires d'essai relatifs aux règles de calcul desassemblages à brides circulaires avec jointFlansche und ihre Verbindungen - Dichtungskennwerte undPrüfverfahren für die Anwendung der Regeln für dieAuslegung von Flanschverbindungen mit runden Flanschenund DichtungenThis European Standard was approved by CEN on 27 October 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13555:2004: ESIST EN 13555:2005
EN 13555:2004 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Notations.6 4 List of gasket parameters.7 5 Definitions.7 6 Test equipment.8 7 Test specimens.10 8 Test procedures.11 9 Report details.19 Annex A (informative)
Generalised test rig schematic.20 Annex B (informative)
Test rig schematic for compression and compression creep tests.21 Annex C (informative)
Test rig schematic for ambient temperature leakage measurement.22 Annex D (informative)
Schematic of leakage rig allowing use of interchangeable face plate.23 Annex E (informative)
Transferability of measured leakage rates to service conditions.24 Annex F (informative)
Relationship of gasket parameters of this standard with those from PVRC method.25 Annex G (informative)
The measurement of the sealing parameter Qsmin (L) after long term service simulating exposure to elevated temperature.26 Bibliography.28
SIST EN 13555:2005
EN 13555:2004 (E) 3 Foreword This document (EN 13555:2004) has been prepared by Technical Committee CEN/TC 74 "Flanges and their joints", the secretariat of which is held by DIN. 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 June 2005, and conflicting national standards shall be withdrawn at the latest by June 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Esto-nia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 13555:2005
EN 13555:2004 (E) 4 Introduction This document provides the test procedures to allow the generation of the gasket parameters to enable the design equations established in EN 1591-1 to be employed. The same test procedures may be used for "Type Testing" of gaskets and gasket materials. These procedures are not for routine quality control purposes. SIST EN 13555:2005
EN 13555:2004 (E) 5 1 Scope This document specifies the design parameters of gaskets and gasket materials required by EN 1591-1 and pro-vides the test procedures for establishing the values of these parameters for inclusion in ENV 1591-2. The testing procedures given might be applicable to gaskets of other shapes and dimensions but this shall be indi-cated in the report. Gaskets which are wholly based upon elastomers, or based upon elastomer with the inclusion of particulate fillers or particulate reinforcement, are beyond the scope of this document. 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 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN desig-nated — Part 1: Steel flanges EN 1514-1, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 1: Non-metallic flat gaskets with or without inserts EN 1514-2, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 2: Spiral wound gaskets for use with steel flanges EN 1514-3, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 3: Non-metallic PTFE envelope gaskets EN 1514-4, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 4: Corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flanges EN 1514-6, Flanges and their joints — Dimensions of gaskets for PN-designated flanges — Part 6: Covered ser-rated metal gaskets for use with steel flanges EN 1514-7, Flanges and their joints — Gaskets for PN-designated flanges — Part 7: Covered metal jacketed gas-kets for use with steel flanges EN 1591-1, Flanges and their joints — Design rules for gasketed circular flange connections — Part 1: Calculation method ENV 1591-2, Flanges and their joints — Design rules for gasketed circular flange connections — Part 2: Gasket parameters EN 1759-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class designated — Part 1: Steel flanges, NPS ½ to 24 EN 1779, Non-destructive testing — Leak testing — Criteria for method and technique selection EN 12560-1, Flanges and their joints — Gaskets for Class-designated flanges — Part 1: Non-metallic flat gaskets with or without inserts EN 12560-2, Flanges and their joints — Gaskets for Class-designated flanges — Part 2: Spiral wound gaskets for use with steel flanges EN 12560-3, Flanges and their joints — Gaskets for Class-designated flanges — Part 3: Non-metallic PTFE enve-lope gaskets SIST EN 13555:2005
EN 13555:2004 (E) 6 EN 12560-4, Flanges and their joints — Gaskets for Class-designated flanges — Part 4: Corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flanges EN 12560-5, Flanges and their joints — Gaskets for Class-designated flanges — Part 5: Metallic ring joint gaskets for use with steel flanges EN 12560-6, Flanges and their joints — Gaskets for Class-designated flanges — Part 6: Covered serrated metal gaskets for use with steel flanges EN 12560-7, Flanges and their joints — Gaskets for Class designated flanges - Part 7: Covered metal jacketed gaskets for use with steel flanges EN ISO 4287, Geometrical products specification (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters (ISO 4287:1997) ISO 554, Standard atmospheres for conditioning and/or testing — Specifications 3 Notations For the purposes of this document, the following notations apply. Where units are applicable, they are shown in brackets. Where units are not applicable, no indication is given. αG the axial coefficient of thermal expansion of gasket [K- 1] eG gasket or sealing element thickness [mm] ∆eG change in gasket or sealing element thickness [mm] AG area of gasket subjected to surface pressure [mm2] d internal diameter of gasket [mm] ds internal diameter of
area of gasket subjected to surface pressure [mm] D external diameter of gasket [mm] Ds external diameter of area of gasket subjected to surface pressure [mm] EG the secant unloading modulus of the gasket [MPa] LN leakage rate class — subscript N indicates the maximum specific leakage rate for that [mg s- 1 m- 1]
leakage rate class
PQR ratio of gasket surface pressures after & before relaxation — Q surface pressure [MPa] QA gasket surface pressure at assembly [MPa] Qmin (L) the minimum level of surface pressure required for leakage rate class L on assembly [MPa] Qsmin (L) the minimum level of surface pressure required for leakage rate class L after off-loading [MPa] Qsmax the maximum surface pressure than can be safely imposed upon the gasket at the service [MPa]
temperature without damage SIST EN 13555:2005
EN 13555:2004 (E) 7 Concordance with EN 1591-1 and ENV 1591-2: QA, the gasket surface pressure at assembly is the gasket stress at the load situation 0 and is defined by Q0 in EN 1591-1 and ENV 1591-2. Qsmax, the maximum surface pressure that can be safely imposed upon the gasket at the indicated temperature without damage is the Qmax,ref defined in ENV 1591-2. Qsmin (L) corresponds the QI defined in EN 1591-1 and in ENV 1591-2. 4 List of gasket parameters The gasket parameters relevant to the calculation procedures for the design of bolted flange connections as given in ENV 1591-2 are shown in Table 1 together with the test procedures applicable for determining the value of the parameter in each case. Table 1 — Gasket parameters and test procedures Gasket parameter Definition Clause Test procedure(s) Clause
Qsmax 5.1
8.4
Qmin (L) 5.2
8.7
Qsmin (L) 5.4
8.7 and 8.8
PQR 5.5
8.6
EG 5.6
8.5
αG 5.7
8.9
5 Definitions 5.1 Gasket parameter Qsmax maximum gasket surface pressure that may be imposed on the gasket at the indicated temperatures without col-lapse or compressive failure of the gasket 5.2 Gasket parameter Qmin (L) minimum gasket surface pressure on assembly required at ambient temperature in order to seat the gasket into the flange facing roughness and close the internal leakage channels so that the tightness class is to the required level L for the internal test pressure 5.3 Tightness class LN tightness classes are defined in Table 2 in terms of specific leak rates. Additional, better tightness classes can be introduced as required by continuing the series Table 2 — Tightness classes Tightness classes L1,0 L0,1 L0,01 Specific leak rates [mg s- 1 m- 1] ≤ 1,0 ≤ 0,1 ≤ 0,01
The specific leak rate shall be obtained by dividing the measured leak rate by the arithmetic mean of the inner and outer gasket peripheries subjected to surface pressure from the flange facings, π/2 (DS + dS). SIST EN 13555:2005
EN 13555:2004 (E) 8 5.4 Gasket parameter Qsmin (L) minimum gasket surface pressure required under the service pressure conditions, (i.e.) after off loading and at the service temperature, so that the required tightness class L is maintained for the internal test pressure 5.5 Gasket parameter PQR a factor to allow for the effect on the imposed load of the relaxation of the gasket between the completion of bolt up and after long term experience of the service temperature 5.6 Gasket parameters EG the unloading moduli determined from the thickness recovery of the gasket between the initial compression surface pressure and unloading to a third of this initial surface pressure 5.7 Gasket parameter axial coefficient of thermal expansion αG the coefficient of thermal expansion of the gasket under the service conditions of temperature and gasket surface pressure in the axial direction 5.8 Area of the gasket subjected to surface pressure, AG the area subjected to surface pressure by the flange facings is calculated from: ()224ssGdDA−=π (2) Where the contact area between the test platen and the gasket is fixed by raised faces as part of the design of the test platens, or the gasket overlaps the contact area of the test platens, then the stressed area is calculated from the above with Ds being whichever is the smaller of the outside diameter of the gasket, D, the outside diameter of the platen contact region, or, where used, the outside diameter of the raised face and with ds replaced by whichever is the greater of the inside diameter of the gasket, d, the inside diameter of the platen contact area or, where used, the inside diameter of the raised face 5.9 Ambient Temperature the ambient laboratory temperature during the testing detailed in this document shall be (23 ± 5) °C as recom-mended in ISO 554 but the temperature of the test platens at the start of all tests shall be (23 ± 2) °C 5.10 Test Temperatures when testing is carried out at elevated temperature it is recommended, for reasons of uniformity, that the test tem-perature be selected from those shown below Recommended Elevated Temperature T [°C]
50 100 125 150 175 200225250 275300350400 450 500 550600 T [K] 323 373 398 423 448 473498523 548573623673 723 773 823873
In all cases the rate of increase of temperature shall be 2 °C per minute. 6 Test equipment 6.1 Design Schematics of test rigs for compression, compression creep, and leakage measurement are shown in informative Annexes A to D. Annex A is a generalised schematic with the other figures providing further detail for specific
aspects of the tests. SIST EN 13555:2005
EN 13555:2004 (E) 9 6.2 Test platens The test platens, and heater assembly where appropriate, shall be sufficiently rigid so that any load imposed on the gasket can be withstood and so that there is no platen deformation which results in gasket surface pressure varia-tion. This rigidity aspect can also be important when gasket elastic recovery is being investigated. The dimensions of the test platen raised faces shall be as given in EN 1092-1 for a DN 40 / PN 40 gasket and
EN 1759-1 for an NPS 4 CLASS 300 gasket. Figures B.1 and C.1 show the dimensions in the former case. 6.3 Surface finish of test platens The surface finish of the test platens shall conform to the following:
3,2 µm < Ra < 6,3 µm Exceptions to this range are acceptable where the gasket is intended for use with a surface finish outside of this range. In this case the surface finish used must be recorded. This surface finish can be achieved by lathe turning with the following parameters: Helical pitch: 0,3 mm; Tool radius: 0,8 mm; Depth: 0,015 mm. The recommended Ra values shall be checked before each test. Local errors shall not exceed twice the value of Ra (see EN ISO 4287). Before each test, the freedom from debris from the previous test and from scratch and impact damage to the sur-face finish of the platens shall be checked visually. Experience has indicated that during hot compression tests, such as the Qsmax test, the use of stainless steel foils or shims of thickness of 0,05 mm thickness between the test gasket and the platens protects the flange surface finish because platen cleaning, with the inherent probability of damaging the platen surface finish, is eliminated. If there is any effect from the use of such foils it will be conservative. Where foils are used the fact of their use shall be included in the test report issued. Foils shall not be re-used and shall not be used in sealing tests 6.4 Measurement of gasket thickness For those procedures where the gasket thickness has to be monitored during the test there shall be either three displacement transducers at 120° spacing around the circumference of the platens or one displacement transducer placed on the central line. However, for a leak test, the use of an axial transducer is not recommended as it introduces a sealing complication to the rig design. 6.5 Loading Any loading means may be used that allows the gasket to be loaded and unloaded at a required and consistent rate. The rate of loading and unloading to be used is fixed as: 0,5 MPa/s for all types of gasket except for PTFE based gaskets when 0,1 MPa/s shall be used. The loading shall be recorded as a function of time. SIST EN 13555:2005
EN 13555:2004 (E) 10 6.6 Temperature The rate of increase of temperature in all elevated temperature tests shall be 2 °C per minute 6.7 Leakage Measurement EN 1779 gives the limits that can be achieved by various method of leakage measurement. The information given in that document shall be taken into account when selecting a measurement system. For modern, high performance, sealing materials and gasket styles, the most appropriate method of measurement is very likely to be mass spectrometery. 7 Test specimens 7.1 Number of specimens At least two specimens for each type of test shall be tested, in order to check the repeatability of the results. 7.2 Procurement and identification of specimens The gaskets to be tested shall be selected at random from production gaskets or shall be cut from sheet represen-tative of normal production. In both cases some basic checks shall be made in order to ensure that the gaskets or sheet are acceptable by the normal quality assurance criteria before the tests to this document are carried out. The results of these checks shall be recorded. In all cases, full traceability to production shall be maintained. 7.3 Pre-conditioning of the specimen gaskets For every gasket type where the sealing element is not solid metal the gasket shall be conditioned as indicated be-low before any of the tests of this document are carried out. The test gasket shall be held for at least 48 hours in air with a relative humidity of (50 ± 6) % at ambient tempera-ture. 7.4 Dimensions of test gaskets The test gasket dimensions shall be either of those specified in Table 3: Table 3 — Test gasket dimensions Flange description Raised face dimensions according to Gasket dimensions according to DN 40/PN 40 EN 1092-1 EN 1514-1 to 7 (according to the type of gasket) NPS 4 CLASS 300 EN 1759-1 EN 12560-1 to 7 (according to the type of gasket)
Where the intended service is in tongue and groove flanges, the test gasket size is specified in EN 1092-1 or in EN 1759-1, and the test shall be carried out with test platens which have a tongue and groove configuration. Tolerance of the platens for tongue and groove configurations shall be as given below: Negative tolerance for tongue width, Positive tolerance for groove width. If this mode of testing is used it shall be clearly stated in the report. SIST EN 13555:2005
EN 13555:2004 (E) 11 7.5 Measurement of test gaskets as received The internal and external diameter of the gasket or sealing face shall be measured with an appropriate device such as micrometer, caliper or circometer (π tape) at ambient temperature. Except where a circometer is used, the measurement shall be taken at not less than four positions around the gas-ket and the mean diameter shall be reported. The mean values shall conform to the theoretical values within the tolerances given in the appropriate document or the supplier's information. The as received thickness of the gasket or sealing element shall be measured by a micrometer or other suitable device with contact faces wide enough to provide a measurement without penetration. The value of the reference gasket thickness is obtained by measuring the gasket thickness under a 1 MPa surface pressure at ambient tem-pe
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.