SIST EN 13575:2012
(Main)Static thermoplastic tanks for the above ground storage of chemicals - Blow moulded or rotationally moulded polyethylene tanks - Requirements and test methods
Static thermoplastic tanks for the above ground storage of chemicals - Blow moulded or rotationally moulded polyethylene tanks - Requirements and test methods
The standard specifies requirements for materials, physical properties and performance for blow moulded and rotationally moulded polyethylene single tanks, with or without reinforcement, for the above ground storage of chemical liquids except water and those liquids dealt with by EN 13341.
It is only applicable to static blow moulded or rotationally moulded polyethylene tanks, which are subjected to atmospheric pressures, and having a volume of 400 l to 10 000 l. Except for periodic temperature fluctuation their normal operating temperature does not exceed 25 °C.
Ortsfeste Tanks aus Thermoplasten für die oberirdische Lagerung von Chemikalien - Tanks aus blas- oder rotationsgeformten Polyethylen - Anforderungen und Prüfverfahren
Dieses Dokument legt Anforderungen für Werkstoffe, physikalische Eigenschaften und Leistungseigen-schaften für einzelne Tanks aus blas- oder rotationsgeformtem Polyethylen mit oder ohne Verstärkung fest, die für die oberirdische Lagerung von Chemikalien außer Wasser und den Flüssigkeiten nach EN 13341 verwendet werden können. Dieses Dokument gilt nur für ortsfeste Tanks aus blas- oder rotationsgeformtem Polyethylen mit einem Volumen zwischen 400 l und 10000 l, die atmosphärischen Drücken ausgesetzt sind. Ihre normale Betriebs-temperatur übersteigt nicht 25 °C, jedoch können sie zeitweisen Temperaturschwankungen unterworfen sein. Für Tanks nach dieser Norm wird von einer beabsichtigten Lebensdauer von 10 Jahren ausgegangen. Dieses Dokument legt Prüfverfahren und Prüfungen für die werkseigene Produktionskontrolle fest. Dieses Dokument berücksichtigt keine Auswirkungen von Wind- und Schneelasten, die Gegenstand des Einbaus sind. ANMERKUNG Es ist möglich, dass über die Anforderungen dieser Norm hinausgehende nationale und/oder inter-nationale Vorschriften für die Lagerung von Flüssigkeiten in Tanks und deren Aufstellung gelten.
Réservoirs statiques thermoplastiques destinés au stockage non enterré de produits chimiques - Réservoirs en polyéthylène moulés par soufflage ou par rotation - Exigences et méthodes d'essai
Le présent document spécifie les exigences relatives aux matières, les propriétés physiques et les performances des réservoirs simples en polyéthylène moulés par soufflage ou par rotation, avec ou sans renfort, utilisés pour le stockage non enterré de liquides chimiques, à l'exception de l'eau et des liquides traités dans l'EN 13341. Il s'applique uniquement aux réservoirs statiques en polyéthylène moulés par soufflage ou par rotation qui sont soumis à la pression atmosphérique et dont le volume est compris entre 400 l et 10 000 l. A l'exception des fluctuations périodiques de température, leur température normale de service ne dépasse pas 25 °C. La durée d'utilisation prévue des réservoirs conformes à la présente norme est de 10 ans. Le présent document spécifie les méthodes d'essai ainsi que les essais de contrôle de la production en usine. Le présent document ne prend pas en compte les conséquences des charges dues au vent et à la neige qui sont considérées être une question d'installation. NOTE Des réglementations nationales et/ou internationales allant au-delà des exigences de la présente norme peuvent s'appliquer au stockage des liquides et à l'installation des réservoirs.
Stacionarni plastomerni rezervoarji za nadzemno skladiščenje kemikalij - Rezervoarji iz polietilena, pihanega ali rotacijsko oblikovanega - Zahteve in preskusne metode
Ta evropski standard določa zahteve za materiale, fizikalne lastnosti in delovanje rezervoarjev iz pihanega ali rotacijsko oblikovanega polietilena, z armaturo ali brez nje, za nadzemno skladiščenje kemičnih tekočin z največjo specifično maso 1400 kg/m3, razen vode in tekočin iz standarda EN 13341. Uporablja se le za stacionarne rezervoarje iz pihanega ali rotacijsko oblikovanega polietilena, ki so izpostavljeni atmosferskemu tlaku, niso pa izpostavljeni nobeni zunanji obremenitvi in imajo prostornino od 400 do 10.000 l. Razen občasnega temperaturnega nihanja njihova običajna delovna temperatura ne presega 25 °C. Za rezervoarje v skladu s tem evropskim standardom je pričakovana doba predvidene uporabe 10 let. Ta evropski standard določa preskusne metode in kontrolne preskuse tovarniške proizvodnje.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Ortsfeste Tanks aus Thermoplasten für die oberirdische Lagerung von Chemikalien - Tanks aus blas- oder rotationsgeformten Polyethylen - Anforderungen und PrüfverfahrenRéservoirs statiques thermoplastiques destinés au stockage non enterré de produits chimiques - Réservoirs en polyéthylène moulés par soufflage ou par rotation - Exigences et méthodes d'essaiStatic thermoplastic tanks for the above ground storage of chemicals - Blow moulded or rotationally moulded polyethylene tanks - Requirements and test methods23.020.10UH]HUYRDUMLStationary containers and tanksICS:Ta slovenski standard je istoveten z:EN 13575:2012SIST EN 13575:2012en,fr,de01-julij-2012SIST EN 13575:2012SLOVENSKI
STANDARDSIST EN 13575:20051DGRPHãþD
SIST EN 13575:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13575
April 2012 ICS 23.020.10 Supersedes EN 13575:2004English Version
Static thermoplastic tanks for the above ground storage of chemicals - Blow moulded or rotationally moulded polyethylene tanks - Requirements and test methods
Réservoirs statiques thermoplastiques destinés au stockage non enterré de produits chimiques - Réservoirs en polyéthylène moulés par soufflage ou par rotation - Exigences et méthodes d'essai
Ortsfeste Tanks aus Thermoplasten für die oberirdische Lagerung von Chemikalien - Tanks aus blas- oder rotationsgeformtem Polyethylen - Anforderungen und Prüfverfahren This European Standard was approved by CEN on 25 February 2012.
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.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13575:2012: ESIST EN 13575:2012
EN 13575:2012 (E) 2 Contents
Page Foreword . 31Scope . 42Normative references . 43Terms and definitions . 54Requirements for materials . 54.1Tank . 54.2Material . 55Design requirements . 75.1General . 75.2Filling systems . 75.3Venting systems . 75.4Suction/outlet system . 75.5Overfill alarm / overfill prevention system . 75.6Contents gauge connection facility . 76Requirements for tanks . 77Marking, transport, handling and installation of tanks . 107.1Marking . 107.2Transport and handling . 107.3Installation . 10Annex A (informative)
Creep curves . 11Annex B (normative)
Test methods for determination of material characteristics . 13B.1Density . 13B.2Melt flow rate . 13B.3Tensile properties . 13B.4Chemical resistance . 14B.5Weather resistance . 16Annex C (normative)
Test methods for determination of tank characteristics . 17C.1Capacity . 17C.2Visual inspection . 17C.3Mass . 17C.4Wall thickness . 17C.5Impact . 17C.6Impact strength at low temperature . 17C.7Elongation or deformation . 18C.8Pressure resistance . 19C.9Leak tightness . 20Annex D (informative)
Evaluation of conformity . 21D.1General . 21D.2Type testing . 21D.3Factory production control . 22Annex E (informative)
A-deviations . 24Bibliography . 27 SIST EN 13575:2012
EN 13575:2012 (E) 3 Foreword This document (EN 13575:2012) has been prepared by Technical Committee CEN/TC 266 “Thermoplastic static tanks”, 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 October 2012, and conflicting national standards shall be withdrawn at the latest by October 2012. This document supersedes EN 13575:2004. The main changes compared to the previous edition are: a) Clause 1, Scope: the field of application has been extended to tanks with a volume of 400 l to 10 000 l; b) Clause 2, Normative references has been updated; c) Clause 6, Evaluation of conformity has been revised and moved to Annex D in its entirety; d) B.3. Tensile properties has been revised; e) B.4, Chemical resistance has been revised with reference to EN ISO 23667; f) C.8: For the pressure resistance test a support framework for tanks > 3 500 l is permitted; g) Annex D has been deleted; h) Annex E has been deleted; i) The new Annex D "Evaluation of conformity" has been added; j) The new Annex E "A-deviations" has been added due to the national regulations of the Netherlands. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] 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 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, Turkey and the United Kingdom.
SIST EN 13575:2012
EN 13575:2012 (E) 4 1 Scope This European Standard specifies requirements for materials, physical properties and performance for blow moulded and rotationally moulded polyethylene single tanks, with or without reinforcement, for the above ground storage of chemical liquids having a maximum specific gravity of 1 400 kg/m3 except water and those liquids dealt with by EN 13341. It is only applicable to static blow moulded or rotationally moulded polyethylene tanks, which are subjected to atmospheric pressures but not subject to any external loading and having a volume of 400 l to 10 000 l. Except for periodic temperature fluctuation their normal operating temperature does not exceed 25 °C.
Tanks according to this European Standard are expected to have a period of intended use of 10 years. This European Standard specifies test methods and factory production control tests as well. NOTE National and/or international regulations above and beyond the requirements of this standard may apply to the storage of liquids and the installation of tanks. 2 Normative references The following documents, in whole or in part, 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 13616, Overfill protection devices for static tanks for liquid petroleum fuels EN ISO 179-1, Plastics Determination of Charpy impact properties Part 1: Non-instrumented impact test (ISO 179-1:2000) EN ISO 293:2005, Plastics Compression moulding of test specimens of thermoplastic materials (ISO 293:2004) EN ISO 527-2:1996, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2:1993 including Corr 1:1994) EN ISO 1133, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics (ISO 1133:2005) EN ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics Part 1: Immersion method, liquid pyknometer method and titration method (ISO 1183-1:2004) EN ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics Part 2 Density gradient column method (ISO 1183-2:2004) EN ISO 1872-2:2007, Plastics — Polyethylene (PE) moulding and extrusion materials — Part 2: Preparation of test specimens and determination of properties (ISO 1872-2:2007)
EN ISO 4892-1, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance (ISO 4892-1:1999) EN ISO 4892-2, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
(ISO 4892-2:2006) EN ISO 23667:2007, Packaging —Transport packaging for dangerous goods — Rigid plastics and plastics composite IBCs — Compatibility testing (ISO 23667:2007)
SIST EN 13575:2012
EN 13575:2012 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tank container for the storage of liquids at atmospheric pressure which retains its designed shape without any support when empty 3.2 brimful capacity (of a tank) volume of water held by the tank filled through the filling orifice to the point of overflowing 3.3 maximum filling capacity (of a tank) value of 95 % of the brimful capacity 3.4 reinforcement constitutive element of a tank, which contributes to its mechanical stability 3.5 regrind material prepared from clean, rejected, unused tanks, including trimmings from the production of tanks that will be reprocessed in a manufacturer's plant after having been previously processed by the same manufacturer in the production of tanks 4 Requirements for materials 4.1 Tank Flammable liquids with a flash point > 55 °C may be stored in these tanks without further requirements.
Flammable liquids with a flash point ≤ 55 °C may be only stored in these tanks if the requirements concerning electrostatic behaviour according to CLC/TR 50404 are considered. 4.2 Material The raw materials and samples taken from the tanks shall be tested and fulfil the requirements according to Table1.
The proportion of the regrind from the same material shall not exceed 50 % for blow-moulded tanks. Regrind shall not be used for rotationally moulded tanks.
If required by national authorities, creep curves similar to those given in Annex A shall be used to determine the long-term behaviour of the material.
If required by national authorities, the impact strength at low temperature shall be determined. When tested in accordance with C.6, the impact strength of a sample, cut from the tank, measured at - 18 °C shall be at least 75 % of the impact strength measured at (23 ± 2) °C. SIST EN 13575:2012
EN 13575:2012 (E) 6 Table 1 — Material requirements Material type Property Requirement Test method Blow-moulded polyethylene Densitya
shall not be less than 938 kg/m3 B.1 Melt flow rateb shall be less than 12 g/10 min at 190 ºC, 21,6 kg maximum increase of the melt flow rate of the moulded tank shall not be greater than 15 % of the value determined on the raw material B.2
Tensile strength c tensile strength at yield shall not be less than 21 MPa elongation at yield shall not be more than 15 % elongation at break shall not be less than 200 % B.3 Rotationally moulded polyethylene Densitya shall not be less than 930 kg/m3 B.1 Melt flow rateb shall be 4,0 g/10 min ± 3,0 g/10 min at 190 ºC, 2,16 kg maximum variation of the melt flow rate of the moulded tank shall not be greater than 20 % of the value determined on the raw material B.2 Tensile strength c tensile strength at yield shall not be less than 15 MPa elongation at yield shall not be more than 25 % elongation at break shall not be less than 200 % B.3 Blow-moulded polyethylene and rotationally moulded polyethylene Resistance against chemical liquidsc Absorption behaviour mass alteration shall be less than 10 %. B.4.3 Stress cracking resistance either: After 28 days immersion the tensile strength shall not be less than 85 % of the reference sample without pin impression or:
-------------------------------------------- the time to 50 % failure shall not be less than 500 h or:
-------------------------------------------- the time to failure at reference stress 9 MPa shall not be less than 20 h
B.4.4.2
B.4.4.3
B.4.4.4 Degradation test the increase in melt flow rate shall not be more than 30 % reduction in elongation at break shall not exceed 50 % of that measured in B.3. B.4.5 Weather resistancec
For external
installations after exposure to global irradiance of 34 GJ/m2
(corresponding to an irradiance of 2,3 GJ/m² for the band from 300 nm to 400 nm ) the elongation at break shall be greater than 50 % of the initial value. For internal installations the elongation at break after exposure to global irradiance of 3,4 GJ/m2 (corresponding to an irradiance of 0,23 GJ/m² for the band from 300 nm to 400 nm) shall be greater than 50 % of the initial elongation at break. NOTE The manufacturer should ensure that changing the additive package does not decrease weather resistance. B.5 a Test to be carried out on raw material. b Test to be carried out on raw material and on tank. c Test to be carried out on tank.
SIST EN 13575:2012
EN 13575:2012 (E) 7 5 Design requirements 5.1 General The requirements according to 5.2 to 5.6 are minimum requirements. Additionally openings, e.g. manholes or inspection hatches, are recommended. 5.2 Filling systems In the case of direct fill, the opening for filling shall be a minimum of 38 mm in diameter and shall be covered with a cap or lid. 5.3 Venting systems All tanks shall be equipped with venting facilities. The cross sectional area of the venting shall not be less than the cross sectional area of the filling system. The cross sectional area shall be sufficient to avoid either over- or under-pressure. 5.4 Suction/outlet system Tanks shall be equipped with an opening permitting the safe and reliable connection of withdrawal systems. All fittings shall be corrosion resistant. The tank outlet may be installed above or below the liquid level. 5.5 Overfill alarm / overfill prevention system All tanks, which are filled by fixed pipework, shall have on the top of the tank a provision to fit an appropriate overfill alarm/overfill prevention system, which in the case of liquid petroleum fuels shall be in accordance with the requirements of EN 13616. 5.6 Contents gauge connection facility If the level of liquid can be seen through the walls of the tank a contents gauge is not required. In all other cases provision shall be made for a contents gauge to be fitted. 6 Requirements for tanks Blow-moulded and rotationally-moulded tanks shall be tested according to Table 2 and Table 3. SIST EN 13575:2012
EN 13575:2012 (E) 8 Table 2 — Requirements for blow-moulded polyethylene thermoplastic tanks Property Requirement Test method Capacity The brimful capacity shall be measured The maximum filling capacity, declared by the manufacturer, shall be checked. C.1 Visual inspection There shall be no bubbles, blisters or other defects in the tank wall which could cause a hole or fracture. C.2 Mass Minimum mass shall be the mass of the lightest tank. C.3 Wall thickness For tanks tested in accordance with C.7.1 the minimum wall thickness shall not be less than 2,5 mm. C.4 For tanks tested in accordance with C.7.2, the minimum wall thickness shall be as follows, except for each area in which the surface does not exceed 300 mm2, where a margin of 10 % shall be allowed regarding the minimum wall thickness. These areas shall be located a minimum of 50 mm from the bottom of the tank. The manufacturer shall declare in a document that the margin has no effects on the physical properties of the tank. For maximum filling capacity Minimum wall thickness ≥ 400 l, < 1 000 l 3,0 mm ≥ 1 000 l, < 1 500 l 3,2 mm ≥ 1 500 l, < 2 000 l 3,5 mm ≥ 2 000 l, < 2 500 l 3,7 mm ≥ 2 500 l, < 3 000 l 3,9 mm ≥ 3 000 l, < 3 500 l 4,0 mm The minimum wall thickness of tanks with a maximum filling capacity ≥ 3 500 l shall be determined according to C.7.1. Impact resistance The tank shall remain leak tight. C.5 Elongation Elongation at the surface shall not exceed 1,5 % after 1 000 h. C.7.1 Deformation After refilling, the deformation shall conform to the following formulae: mm100id+≤ww mm200id+≤ll where dlis the length of the tank after deformation in mm, il is the initial length of the tank in mm, dw is the width of the tank after deformation in mm , iw is the initial width of the tank in mm. C.7.2 Pressure resistance The tank shall be pressure resistant. In the case of reinforced tanks, the reinforcement shall retain its reinforcing function up to a hydrostatic pressure corresponding to twice the tank height. C.8 Leak tightness The tank shall be leak tight. C.9 SIST EN 13575:2012
EN 13575:2012 (E) 9 Table 3 — Requirements for rotationally moulded polyethylene thermoplastic tanks Property Requirement Test method Capacity The brimful capacity shall be measured. The maximum filling capacity, declared by the manufacturer, shall be checked. C.1 Visual inspection There shall be no bubbles, blisters or other defects in the tank wall which could cause a hole or fracture. C.2 Mass Minimum mass shall be the mass of the lightest tank. C.3 Wall thickness For tanks tested in accordance with C.7.1 the minimum wall thickness shall not be less than 2,5 mm.
C.4 For tanks tested in accordance with C.7.2, the minimum wall thickness shall be as follows, except for each area in which the surface does not exceed 300 mm2, where a margin of 10 % shall be allowed regarding the minimum wall thickness. These areas shall be located a minimum of 50 mm from the bottom of the tank. The manufacturer shall declare in a document that the margin has no effects on the physical properties of the tank. For maximum filling capacity Minimum wall thickness ≥ 400 l, < 1 000 l 3,3 mm ≥ 1 000 l, < 1 500 l 3,5 mm ≥ 1 500 l, < 2 000 l 3,9 mm ≥ 2 000 l, < 2 500 l 4,1 mm ≥ 2 500 l, < 3 000 l 4,3 mm ≥ 3 000 l, < 3 500 l 4,4 mm ≥ 3 500 l, < 5 000 l 4,8 mm ≥ 5 000 l, < 7 500 l 5,1 mm ≥ 7 500 l, < 10 000 l 5,4 mm Impact resistance The tank shall remain leak tight. C.5 Elongation Elongation at the surface shall not exceed 1,5 % after 1 000 h. C.7.1 Deformation After refilling the deformation shall conform to the following inequalities: mm100id+≤ww mm200id+≤ll where dlis the length of the tank after deformation in mm, il is the initial length of the tank in mm, dw is the
width of the tank after deformation in mm, iw is the initial width of the tank in mm. C.7.2 Pressure resistance The tank shall be pressure resistant. In the case of reinforced tanks, the reinforcement shall retain its reinforcing function up to a hydrostatic pressure corresponding to twice the tank height. C.8 Leak tightness The tank shall be leak tight. C.9
SIST EN 13575:2012
EN 13575:2012 (E) 10 7 Marking, transport, handling and installation of tanks 7.1 Marking The following information shall be marked legibly, visibly and durably on the tank: a) permitted location (internal and/or external); b) month and year of manufacture; c) brimful capacity; d) maximum filling level for translucent tanks; e) EN 13575; f) statement "For storage of chemicals as certified by the manufacturer"; g) serial number; h) identification of manufacturer; i) material type. 7.2 Transport and handling The manufacturer’s instructions and national requirements regarding transportation, storage, installation and maintenance shall be complied with. NOTE Special properties of the stored product should be taken into account. 7.3 Installation The manufacturer shall provide installation instructions which, where relevant, shall also take into account wind and snow loading and ambient temperature. SIST EN 13575:2012
EN 13575:2012 (E) 11 Annex A (informative)
Creep curves
Key X Hoop stress in MPa Y Rupture time in hours Figure A.1 — Creep rupture time of PE-HD-pipes (rotational moulding grades) SIST EN 13575:2012
EN 13575:2012 (E) 12
Key X Hoop stress in MPa Y Rupture time in hours Figure A.2 — Creep rupture time of PE-HD-pipes (blow moulding resin) SIST EN 13575:2012
EN 13575:2012 (E) 13 Annex B (normative)
Test methods for determination of material characteristics B.1 Density The density of the raw material shall be measured in accordance with EN ISO 1183-1 or EN ISO 1183-2. The method in accordance with EN ISO 1872-2 shall be used to anneal the specimen. B.2 Melt flow rate The melt flow rate of the raw material and of a section taken from any location on the moulded tank shall be measured in accordance with EN ISO 1133, using condition G for blow-moulded polyethylene and condition D for rotationally moulded polyethylene. B.3 Tensile properties B.3.1 Blow moulded polyethylene
The test shall be carried out in accordance with EN ISO 527-2:1996 at a testing speed of 100 mm/min, using Type 1B test pieces from plates cut out of the original wall of the blow-moulded tank in the direction of extrusion. For the determination of elongation at break after artificial weathering (see B.4), the type 1BA test pieces shall be prepared by machining weathered plates cut out of the original wall after the exposure of the plates to artificial weathering. NOTE The thickness of the test piece can vary from the requirements of EN ISO 527-2:1996 since it is obtained from the original wall of the tank. B.3.2 Rotationally moulded polyethylene B.3.2.1 Preparation of compression moulded specimen Use a moulding press and mould in accordance with 4.1 and 4.2 of EN ISO 293:2005 respectively. The mould thickness shall be appropriate to obtain a final thickness of the compression-moulded specimen of (3±0,2) mm. Cut a square specimen in the wall thickness of the moulded tank of a mass calculated to fill 105 % of the volume of the cavity of the mould The compression-moulded specimen shall be prepared using the conditions specified in Table 2 of
EN ISO 1872-2:2007, except for the moulded temperature to be applied which shall be 200°C, to obtain the final thickness of (3 ± 0,2) mm. B.3.2.2 Tensile testing The test shall be carried out in accordance with EN ISO 527-2:1996 at a testing speed of 100 mm/min, using type 1BA test pieces cut in a specimen prepared according to B.3.2.1. For the determination of elongation at break after artificial weathering (see B.4), the type 1BA test pieces shall be prepared by machining the weathered specimens. SIST EN 13575:2012
EN 13575:2012 (E) 14 B.4 Chemical resistance B.4.1 Introduction Three types of degradation mechanisms might be observed on polyethylene in contact with chemicals: Softening through swelling (refer to absorption behaviour according to B.4.3); Cracking under stress (refer to stress cracking resistance according to B.4.4); Molecular degradation (refer to degradation test according to B.4.5). B.4.2 General For chemicals assimilated to (a) standard liquid(s) according to the procedure given in Annex C of EN ISO 23667:2007, the chemical resistance shall be proven with the appropriate standard liquid(s) defined in Annex A of EN ISO 23667:2007 (see Table B.1). Table B.1 — Test to do for chemicals assimilated according to Annex C of EN ISO 23667:2007 Standard liquids No test needed Absorption behaviour (B.4.3) Stress cracking resistance (B.4.4) Degradation test (B.4.5) Water X
Wetting solution
X
Acetic acid
X
Normal butyl acetate
X X
Mixture of hydrocarbons (white spirit)
X
Nitric acid
X
For all other chemicals not assimilated in accordance with Annex C of EN ISO 23667:2007 or not listed in Table C.1 of EN ISO 23667:2007, the chemical resistance shall be tested by the chemical itself, taking into account the relevant type(s) of degradation mechanism(s) as defined in B.4.
B.4.3 Absorption behaviour The test shall be carried out using the Method A test procedure described in B.4.1.2 to B.4.1.8 of EN ISO 23667:2007. The test liquid shall be the appropriate standard liquid in accordance with Table B.1 or the chemical intended to be stored. B.4.4
Stress cracking resistance B.4.4.1 General The stress crack resistance shall be measured using either the pin impression test according to B.4.4.2 or the bent strip test according to B.4.4.3 or the full-notch creep test (FNCT) according to B.4.4.4. SIST EN 13575:2012
EN 13575:2012 (E) 15 B.4.4.2 Pin impression test
The t
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