Specification for glass fibre reinforced cisterns of one piece and sectional construction, for the storage, above ground, of cold water

This European Standard specifies the requirements for rectangular and vertical cylindrical glass reinforced plastics (GRP) one piece cisterns and rectangular sectional tanks for the storage of water above ground for both domestic and industrial use within the following capacity ranges,
a)    one piece cistern    500 l to 100 000 l.
b)    sectional tank    500 l and larger
Particular requirements for additional components for cisterns for domestic use are also included.

Spezifikation für textilglasverstärkte Einkammer- oder Mehrkammertanks für die oberirdische Lagerung von Kaltwasser

Anwendungsbereich
Diese Europäische Norm legt Anforderungen fest für einwandige rechteckige und stehende zylindrische, glasfaser-verstärkte (GFK) Tanks und rechteckige Mehrkammertanks zur oberirdischen Lagerung von Wasser sowohl für Haushalte als auch für industri-ellen Gebrauch für folgende Fassungsvermögen:
a) Einkammertank:    500 l bis 100 000 l;
b) Mehrkammertank: 500 l und mehr.
Besondere Anforderungen für zusätzliche Bauteile für Tanks für Haushalte sind ebenfalls enthalten.

Spécification pour citernes monoblocs et réservoirs compartimentés en PRV pour le stockage hors sol d'eau froide

La présente norme EN spécifie les prescriptions pour les citernes monoblocs rectangulaires et cylindriques verticales et les réservoirs compartimentés rectangulaires en PRV destinés au stockage hors sol de l'eau a usage domestique et industrielle, compris dans la gamme de contenances suivantes :
a) citerne monobloc : 500 L a 100 000 L ;
b) réservoir compartimenté : 500 L et plus.
Des prescriptions particulieres relatives aux composants supplémentaires des citernes a usage domestique sont également incluses.

Specifikacije za rezervoarje iz armiranega poliestra izvedenih iz ene ali več komor za nadzemno shranjevanje hladne vode

General Information

Status
Published
Publication Date
31-Dec-2001
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jan-2002
Due Date
01-Jan-2002
Completion Date
01-Jan-2002

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Spezifikation für textilglasverstärkte Einkammer- oder Mehrkammertanks für die oberirdische Lagerung von KaltwasserSpécification pour citernes monoblocs et réservoirs compartimentés en PRV pour le stockage hors sol d'eau froideSpecification for glass fibre reinforced cisterns of one piece and sectional construction, for the storage, above ground, of cold water23.020.10UH]HUYRDUMLStationary containers and tanksICS:Ta slovenski standard je istoveten z:EN 13280:2001SIST EN 13280:2002en01-januar-2002SIST EN 13280:2002SLOVENSKI

STANDARD
SIST EN 13280:2002

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13280August 2001ICS 23.020.10English versionSpecification for glass fibre reinforced cisterns of one piece andsectional construction, for the storage, above ground, of coldwaterSpécification pour citernes monoblocs et réservoirscompartimentés en PRV pour le stockage hors sol d'eaufroideSpezifikation für textilglasverstärkte Einkammer- oderMehrkammertanks für die oberirdische Lagerung vonKaltwasserThis European Standard was approved by CEN on 9 June 2001.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 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13280:2001 ESIST EN 13280:2002

EN 13280:2001 (E)2ContentspageForeword...................................................................................................................................31

Scope.....................................................................................................................................32

Normative references...........................................................................................................33

Terms and definitions...........................................................................................................44

Designation...........................................................................................................................65

Materials................................................................................................................................76

Appearance and configuration............................................................................................8Raised level control valve chambers shall be fitted when required by the purchaser and shall bedesigned so as to:.........................................................................................................107

Requirements for one piece cisterns and sectional tanks................................................108

Requirements for class A1 and A2 one piece cisterns and sectional tanks only...........159

Requirements for class A1 one piece cisterns and sectional tanks only........................1610

Requirements for class B one piece cisterns..................................................................1711

Marking................................................................................................................................17Annex A(normative)

Method of test for water absorption....................................................................18Annex B.....................................................................................................................................19(normative)

Method of test for deformation............................................................................19Annex C.....................................................................................................................................21(normative)

Method of test for impact resistance..................................................................21Annex D.....................................................................................................................................23(normative)

Sectional tank panel pressure test......................................................................23Annex E......................................................................................................................................24(normative)

Method of test for leaks in a one piece cistern..................................................24Annex F......................................................................................................................................25(normative)

Method of test for impact resistance of one piece cistern covers...................25Annex G.....................................................................................................................................26(normative)

Method of test for the assessment of ingress of particles and insects...........26Annex H.....................................................................................................................................28(normative)

Method for the hot water test for one piece cisterns........................................28Annex J......................................................................................................................................31(normative)

Method of test for the assessment of rigidity of one piece cistern and sectionaltank covers..................................................................................................................31Annex K.....................................................................................................................................32(informative)

Recommendations for thermal insulation........................................................32Annex L......................................................................................................................................34(informative)

Information to be supplied by the purchaser...................................................34Annex M.....................................................................................................................................35(informative)

One piece cistern and sectional tank foundation and installation.................35Bibliography..............................................................................................................................36SIST EN 13280:2002

EN 13280:2001 (E)3ForewordThis European Standard has been prepared by Technical Committee CEN/TC 210 "GRP tanks and vessels", thesecretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by February 2002, and conflicting national standards shall be withdrawnat the latest by February 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.1

ScopeThis European Standard specifies the requirements for rectangular and vertical cylindrical glass reinforced plastics(GRP) one piece cisterns and rectangular sectional tanks for the storage of water above ground for both domestic andindustrial use within the following capacity ranges,a) one piece cistern 500 l to 100 000 l.b) sectional tank 500 l and largerParticular requirements for additional components for cisterns for domestic use are also included.2

Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. For datedreferences, subsequent amendments to or revisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references, the latest edition of the publication referredto applies (including amendments).EN 59Glass reinforced plastics - Measurement of hardness by means of a Barcol impresserEN 578 Plastics piping systems - Plastics pipes and fittings - Determination of the opacityEN 10025:1993Hot rolled products of non-alloy structural steels - Technical delivery conditionsEN 10088-3:1995Stainless steels - Part 3: Technical delivery for semi finished products, bar, rod and sectionsfor general purposesprEN 13121-1:1998GRP tanks and vessels for use above ground- Part 1: Raw materials - Acceptance

conditions and usage conditionsEN ISO 2078Textile glass - Yarns - DesignationISO 75-3 : 1993Plastics - Determination of temperature of deflection under load - Part 3: High strengththermosetting laminates and long-fibre-reinforced plasticsISO 472Polyester resin systems – DesignationISO 1461Metallic coatings - Hot dip galvanized coatings on fabricated ferrous products -RequirementsISO 4759-1Tolerances for fasteners - Part 1: Bolts, screws, studs

and nuts - Product grades A, B and CSIST EN 13280:2002

EN 13280:2001 (E)4ISO 8605Textile glass reinforced plastics; sheet moulding compound (SMC); basis for aspecification3

Terms and definitionsFor the purposes of this European Standard the following terms and definitions apply.3.1cistern3.1.1 one piece cisternrectangular or vertical cylindrical fixed container for holding water at atmospheric pressure at a maximum temperatureof 39 °C3.1.2sectional tankrectangular fixed container assembled from panels for the storage of water at atmospheric pressure at a maximumtemperature of 39 °C. This temperature is higher than is acceptable for drinking water which has a maximum upperlimit 25 °C as defined within the Drinking Water Directive, 80/778/EEC3.2

water for domestic purposeswater supplied for drinking, washing, cooking and sanitary purposes3.3

feed and expansion cisterncistern for supplying cold water to and receiving expansion water from a hot water system3.4

primary expansion cisterncistern connected to a primary circuit of space heating or hot water heating system which accommodates the increasein volume of water in that system when it is heated from cold3.5

secondary water heating systempart of the hot water system comprising the cold feed pipe, any storage cistern, the water heater and flow and returnpipework from which hot water for use is conveyed to all points of draw off3.6

nominal capacityvolume contained in the cistern, measured up to the top edge of the side walls3.7

actual capacityvolume contained in the cistern up to the maximum working level3.8

top edge of tanktop edge of the upper side panels or the lowest point of the cover, whichever is the lowerSIST EN 13280:2002

EN 13280:2001 (E)53.9

raised level inlet chamberenclosed chamber above the level of the cover incorporating an access lid or panel, permitting the level controlmechanism or piped inlet to be mounted at a higher level than would otherwise be possible3.10

maximum working depthdepth of water to the lower edge of the overflow pipe or warning pipe, whichever is the lower3.11

jointing sealantmaterial used to effect a watertight seal between the modular panels of a sectional tank construction3.12

vent pipepipe open to the atmosphere and used in connection with a hot water system for the escape of air and/or steam3.13

ventfitting on the cistern cover providing a protected opening to atmosphere to allow for the movement of air resulting fromchanges in the water level so that the water always remains at atmospheric pressure3.14

warning pipepipe so fixed that its outlet, whether inside or outside a building, is in a conspicuous position where the discharge ofwater can be readily seen3.15

overflow pipepipe connected to the cistern to discharge any overflow therefrom3.16

bracing systeminternal or external structure which provides support to the side walls, divisions, weirs and baffles of the cistern or tank3.17

baffleinternal wall within a cistern or tank, which partially subdivides the cistern or tank in order to increase the length of theflowpath between the inlet and the outlet of the cistern or tank3.18

weirinternal wall within a cistern or tank, which divides the cistern or tank but to less than its full depth such that thecontents can spill over from one side of the weir to the other3.19

divisioninternal wall within a cistern or tank which divides the tank into watertight compartmentsSIST EN 13280:2002

EN 13280:2001 (E)63.20 tank basepanel or panels, principally in the horizontal plane, which form the bottom of the sectional tank3.21 foundationstructure upon which the cistern or tank is constructed3.22 rupturecomplete or catastrophic structural failure3.23 coverrigid close-fitting cover secured to cistern or tank sides which excludes light and the ingress of particles and/or insectsfrom the cistern or tank3.24

test water lineline at 100 mm below the top edge of the side walls of a one piece cistern4

DesignationEach one piece cistern or sectional tank shall be designated by a code with the following components, in the orderpresented.a) The number and date of this European Standard i.e. EN 13280: 2001.b) The capital letters GRP.c) The capital letters and numbers 'A1', 'A2' or 'B' where;'A1' and 'A2' indicates class A one piece cisterns or sectional tanks, which are for use in potable water storage as oneof the following;1) a cold water storage one piece cistern or sectional tank;2) a feed one piece cistern or sectional tank or a combined feed and expansion one piece cistern or sectionaltank, supplying a secondary water heating system;3) a combination of these;'A1' indicates a class A one piece cistern or sectional tank, which is for use in potable water storage, and is suppliedfor use with the additional fittings specified in clause 9;'A2' indicates a class A one piece cistern or sectional tank, which is for use in potable water storage and is supplied foruse without the additional fittings specified in clause 9;NOTE

These fittings are required for use in potable water storage but in that case are supplied and fitted by otherparties.'B' indicates a class B one piece cistern or sectional tank which is for use in the storing of cold non-potable water asone of the following;1) a cold non-potable water one piece cistern or sectional tank;SIST EN 13280:2002

EN 13280:2001 (E)72) a combined feed and expansion one piece cistern or sectional tank to a primary circuit;3) an expansion one piece cistern or sectional tank.d) A number representing the nominal capacity in litres.For example, a sectional tank of nominal capacity 20 000 l intended for use in potable water storage and suppliedwithout the additional fittings specified in clause 9 would be designated asEN 13280 :2001/GRP/A2/200005

Materials5.1

ResinsPolyester resin systems, where used, shall conform to ISO 472 and be selected from the resin types specified in prEN 13121-1:1998.5.2

Fibrous reinforcementThe glass fibre reinforcement used shall be of type 'E' glass.A type 'E' glass, comprising either an alumino-borosilicate glass or an alumino-calco-silicate glass, with or withoutother oxides, comprising mainly aluminium trioxide for enhanced corrosion resistance.NOTE

The description for 'E' glass is consistent with, but more specific than that given in EN ISO 2078.The reinforcement shall be made from continuously drawn filaments of a glass conforming to the above description,and the filaments shall have a sizing compatible with the resin to be used. It may be used in any form free fromlongitudinal splitting, e.g. as continuous or chopped filaments, strands or rovings, mat or fabric.5.3

Sheet moulding compound5.3.1

GeneralSheet moulding compound (SMC) shall conform to the requirements of ISO 8605.SIST EN 13280:2002

EN 13280:2001 (E)85.3.2

ReinforcementThe glass fibre reinforcement in the SMC shall contain 25 mm and/or 50 mm long 'E' glass strands, cut from glassfibre rovings conforming to the requirements given in EN ISO 2078.Where required, additional glass reinforcement shall be used in the moulded part consisting of glass fibre wovenfabrics or continuous filament mat conforming to EN ISO 2078.5.4

Other materials5.4.1

AggregatesWhere required, inert granular materials of particle size between 5 mm and 0,05 mm shall be used as a design part ofthe structure, e.g. graded silica sands.5.4.2

Inert fillersWhere required, an inert filler shall be used with a maximum partical size of 60 m.5.4.3

AdditivesWhere required, release agents, shrinkage control agents, pigment, curing agents, wetting agents, etc. shall be usedas necessary to control those characteristics of the sheet-moulding compound necessary to achieve the requirementsof the moulded panels.5.5

Metal bracingWhere a metal brace is supplied with the cistern or tank, it shall be corrosion resistant and free from sharp edges,sharp corners and surface projections.6

Appearance and configuration6.1

Appearance and quality of finish of cisternsThe internal surfaces of one piece cisterns and sectional tanks and their covers shall be free from such imperfectionswhich may inhibit the cleaning of these internal surfaces.6.2

Configuration of one piece cisterns and sectional tanks6.2.1

One piece cisternsWhen a change in the direction of the cistern wall is necessary this shall be accomplished by the use of a radius of notless than 10 mm. Where the walls of the cistern are tapered, this taper shall not exceed 7 degrees from the vertical.6.2.2

Sectional tanksThe tank shall consist of base and side plates, all constructed from flanged GRP panels with a jointing sealantbetween. The flanges of all panels may be internal or external as required.SIST EN 13280:2002

EN 13280:2001 (E)96.2.2.1

CornersThe corners of a tank shall be formed by either:a) bolting side panels to each other; orb) bolting each side panel to a corner angle member.In each case a jointing sealant shall be used.6.3

Division platesWhere required, one piece cisterns and sectional tanks shall be subdivided into two or more compartments by theinclusion of a division plate constructed from GRP sheet or panels. Division plates shall be sealed leak tight and becapable of supporting water on either side to the maximum working depth.6.4

Baffle and weir platesOne piece cisterns and sectional tanks shall be fitted with baffle plates and/or weir plates if required. They shall beconstructed to withstand only the additional forces created by the water movement they are designed to induce, and inthe case of weir plates, to withstand any additional force due to any imbalance in water pressure created by their use.6.5

Access laddersWhere requested by the purchaser (see annex L), one piece cistern and sectional tanks of depths 1,5 m or more shallbe provided with internal and external access ladders. Consideration for the requirements of external ladders shalltake into account the height of the tank above floor level. All internal ladders shall be protected against corrosion.NOTE There may be difficulties with the provision of safety hoops, should they be considered necessary, because ofspace limitations.6.6

Manholes or access hatchesA manhole or access hatch of at least 600 mm diameter or side dimension shall be provided in one piece cisterns andsectional tanks of capacities greater than 1 000 l and so designed to prevent the ingress of rain water, dust andvermin.6.7

One piece cistern and sectional tank coversCovers shall be fitted on all class 'A1' and 'A2' one piece cisterns and sectional tanks. Class 'B' one piece cisterns andsectional tanks shall be fitted with a cover when required by the purchaser (see 8.2).In any event covers for class 'A1' and class 'A2' cisterns and tanks covers shall be rigid and close fitting, having a gapof less than 0,65 mm and be secured or mechanically fixed with an effective seal to ensure the exclusion of light andthe ingress of particles and/or insects and where connections pass through the cover they shall be sealed.All covers of greater plan area than 2 m2 shall be capable of sustaining an imposed load of 0,6 kN/m2 or 0,9 kNconcentrated load, whichever produces the maximum deflection.SIST EN 13280:2002

EN 13280:2001 (E)106.8

Raised level control valve chambersRaised level control valve chambers shall be fitted when required by the purchaser and shall be designed so as to:a)withstand the forces imposed by the weight and operation of the valve;b)permit free and unrestrained movement of the float and arm where the valve is of this type;c)provide a seal at the junction of the cover to chamber.NOTE

It is recommended that an adequate means of access for control valve maintenance is provided (see 6.6) butof a size compatible with the raised level control valve chamber selected.6.9

VentingOne piece cisterns and sectional tanks shall be fitted with either an air inlet or a breather (see 9.1).NOTE

The size of the vent is determined from the information provided by the purchaser (see annex L).6.10

FastenersFasteners used inside a cistern or tank shall be made from stainless steel in accordance with grade

1.4401 in EN10088-3:1995.The fasteners shall have dimensions in accordance with ISO 4759-1.Fasteners used outside a tank shall be made from grade A, B and C bolts and nuts in accordance with ISO 4759-1and protected from corrosion by galvanising in accordance with ISO 1461 or from stainless steel. Where the tank issituated within a building, external fasteners may be zinc plated.6.11

Bracing systemInternal metallic bracing system members shall be manufactured from stainless steel in accordance with grade 1.4401or other appropriate steel selected from Table 3 of EN 10088-3:1995. External structural supports shall bemanufactured either from mild steel in accordance with S275JO of EN 10025:1993 encapsulated in GRP laminate orsuitably protected from corrosion or galvanized in accordance with ISO 1461 or from stainless steel.NOTE

The design of bracing systems should minimise the possibility of bimetallic corrosion, e.g. where internal andexternal fittings are connected.7

Requirements for one piece cisterns and sectional tanks7.1
General performance requirements7.1.1

OpacityThe one piece cistern or sectional tank structure shall not transmit more than 0,2 % of the visible light incident on it,when tested by the method given in EN 578.SIST EN 13280:2002

EN 13280:2001 (E)117.1.2
Water absorptionThe water absorption shall not exceed 0,5 %
by mass

when the GRP material of construction of the one piece cisternor sectional tank is tested in accordance with annex A.7.1.3

Heat distortion temperatureThe temperature of deflection of the GRP material of construction under a bending stress shall be not less than 70 °Cwhen tested in accordance with ISO 75-3:1993.7.1.4

Barcol hardnessThe Barcol hardness of the GRP material of construction shall be determined in accordance with EN 59 and the resultshall be declared to the purchaser on request.7.2

One piece cisterns7.2.1
Resistance to deformation7.2.1.1

Cylindrical cisternsThe maximum percentage deformation shall not be greater than 0,2 %, when measured in accordance with B.1.7.2.1.2

Rectangular cisternsThe maximum deformation of any strengthening rib or flange shall not exceed the lesser of 10 mm or 1 % of thelength, when measured in accordance with B.2.The maximum deformation of the cistern wall between any strengthening ribs, shall not exceed 1,5 % when measuredin accordance with B.2.NOTE

Care should be taken that the positioning and fixing of strengthening ribs does not create unacceptable strainson the cistern laminate.7.2.2

Resistance to impactThere shall be no visible leaks resulting from any impact damage, when the cistern is tested in accordance withannex C.7.2.3

Leakage testThere shall be no visible leaks, when the cistern is tested in accordance with annex E.7.2.4

Type testingAt least one sample of cistern shall be subjected to the type tests listed in Table 1 to ensure satisfactory typeperformance of cisterns. Samples shall be retested in the following circumstances:SIST EN 13280:2002

EN 13280:2001 (E)12a)

when the method of production is altered or when the manufacturer changes the formulation of the raw materialused. b)

when a change in wall thickness exceeds
10 %. c)
when a change in length, width or diameter exceeds
10 %. d)

when a change in height exceeds 300 mm.Table 1 - Type tests; one piece cisternsType testRequirement in subclauseTest method Deformation7.2.1Annex B Opacity7.1.1EN 578 Impact resistance7.2.2Annex C Leakage7.2.3Annex E Water absorption7.1.2Annex A Heat distortion7.1.3ISO 75-3 : 1993 Barcol hardness7.1.4EN 597.3

Sectional tanks7.3.1

PanelsSectional tank panels can be made of any size. Preferred panel sizes are based either on a 1 000 mm or 1 220 mmsquare modules. Derivatives of these panel sizes shall be based on the basic panel size, e.g. a quarter, a half, one,one and a half, and double panels. Moulded panels may be pre-insulated. Any insulation should be applied to theouter surface of the panel, not to a surface in contact with the tank contents.7.3.2

TolerancesPanels shall have nominal dimensions declared by the manufacturer, subject to the tolerances given in Tables 2 and3.SIST EN 13280:2002

EN 13280:2001 (E)13Table 2 - Tolerances of panel dimensionsMeasurementTolerancePanel size:Overall lengthOverall breadth 1,0 mm 1,0 mmFlange thickness:As Table 3Flange height: 1,0 mmDiaphragm thickness:As Table 3Squareness of panel:(measured as difference of overall lengths across the two diagonals of the panel)1,5 mmFlange angle:(measured as angle of flange relative to the plane of the panel) 1°Flange bolt-holes:DiameterPitch (centre-to-centre)Line of bolt-hole centres(measured as from the flat face of the flange at the two corners of the panel) 0,5 mm 0,5 mm 0,5 mmTable 3 - Tolerances for flange and diaphragm thicknessNominal thicknessMouldingfrom open mouldMouldingfrom closed mouldMatchedmetal mouldsmmmmmmmmup to but notincluding 1,5+ 0,50- 0,25 0,20 0,181,5 up to but notincluding 3 0,75 0,30 0,203 up to but notincluding 6 1,1

0,50 0,306 up to but notincluding 12 1,5
0,75 0,4012 up to but notincluding 25
2,0
1,40 0,5025 and over 3,0
1,90 0,657.3.3

Appearance and quality of finishThe internal surfaces of panels shall be smooth, of even texture, and free from imperfections which may detract fromthe performance of the tank in use. All cut edges of panels in contact with the water in the tank shall be sealed bycoating with resin of a similar composition to that used on the inside surface of the tank panels.7.3.4

Panel drillingPanel assembly bolt holes shall be drilled at the manufacturer's premises.SIST EN 13280:2002

EN 13280:2001 (E)147.4
Requirements for all sectional tanks7.4.1
Performance of panels7.4.1.1

Impact resistanceAn uninsulated panel (see 7.3.1) shall not show any cracking when tested in accordance with C.2.7.4.1.2

Pressure testA panel shall not rupture when tested in accordance with annex D.7.4.1.3

Testing of panelsAt least one panel shall be subjected to the type tests listed in Table 4 to ensure satisfactory type performance ofpanels. Samples shall be retested in the following circumstances:a)

when the method of production is altered or the manufacturer changes the formulation of raw material used; b)

when a change in diaphragm thickness exceeds
10 %; c)
when a change in length or width exceeds
20 %; d)

when there is a change in the depth of use for which the panel is designed.Table 4 - Type tests for sectional tank panelsPropertyRequirement in subclauseTest method Opacity7.1.1EN 578 Impact resistance7.4.1.1C.2 Water absorption7.1.2Annex A Pressure test7.4.1.2Annex D Heat distortion temperature7.1.3ISO 75 Barcol hardness7.1.4EN 597.5

Performance of sectional tanks7.5.1

Leakage testWhen erected, a tank shall not show any visible leakage after filling in accordance with the manufacturer's instructions.The duration of the test shall be for a minimum of 24 h, commencing at least 2 h after the tank has been filled. The testshall be carried out within 10 days of erection unless the manufacturer agrees to a longer period after erection.7.5.2

Resistance to deformationThe maximum deformation for the tank panel flanges between support points shall not exceed the lesser of 10 mm or1 %, when measured in accordance with B.3.SIST EN 13280:2002

EN 13280:2001 (E)158
Requirements for class A1 and A2 one piece cisterns and sectional tanks only8.1

Effect on water qualityWhen used under the conditions for which they are designed, products in contact with or likely to come into contactwith potable water shall not so affect the potable water that it ceases to comply with the relevant EU Directives orRegulations or national legislation in the country of use from time to time in force, it having first been certified that thepotable water supplied did so comply.8.2

CoversClass A1 and A2 one piece cisterns and sectional tanks shall be fitted with covers (see 6.7). These covers shall berigid, close fitting or sealed with a resilient elastomeric sealing compound or

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