SIST EN 13160-7:2003
(Main)Leak detection systems - Part 7: General requirements and test methods for interstitial spaces, leak protecting linings and leak protecting jackets
Leak detection systems - Part 7: General requirements and test methods for interstitial spaces, leak protecting linings and leak protecting jackets
This standard specifies the type test of the interstitial space and the general requirements and test methods for leak protecting linings and leak protecting jackets which are parts of leak detection systems.
Leckanzeigesysteme - Teil 7: Allgemeine Anforderungen und Prüfverfahren für Überwachungsräume, Leckschutzauskleidung und Leckschutzummantelungen
Diese Europäische Norm legt die Typprüfung des Überwachungsraums und die allgemeinen Anforderungen und Prüfverfahren für Leckschutzauskleidungen und Leckschutzummantelungen, die Teile von Leckanzeigesystemen sind, fest.
Systemes de détection de fuites - Partie 7: Exigences générales et méthodes d'essais pour les espaces interstitiels, pour reveements intérieurs et revetements extérieurs protecteurs de fuites
La présente norme spécifie l'essai de type de l'espace interstitiel ainsi que les prescriptions générales et les méthodes d'essai relatives aux inhibiteurs de propulseurs et aux revetements protecteurs de fuites qui font partie intégrante des systemes de détection de fuites.
Sistemi za kontrolo tesnosti - 7. del: Splošne zahteve in metode za kontrolo vmesnih prostorov, notranjih in zunanjih tesnih oblog
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sistemi za kontrolo tesnosti - 7. del: Splošne zahteve in metode za kontrolo vmesnih prostorov, notranjih in zunanjih tesnih oblogLeckanzeigesysteme - Teil 7: Allgemeine Anforderungen und Prüfverfahren für Überwachungsräume, Leckschutzauskleidung und LeckschutzummantelungenSystemes de détection de fuites - Partie 7: Exigences générales et méthodes d'essais pour les espaces interstitiels, pour reveements intérieurs et revetements extérieurs protecteurs de fuitesLeak detection systems - Part 7: General requirements and test methods for interstitial spaces, leak protecting linings and leak protecting jackets23.020.01Fluid storage devices in generalICS:Ta slovenski standard je istoveten z:EN 13160-7:2003SIST EN 13160-7:2003en01-december-2003SIST EN 13160-7:2003SLOVENSKI
STANDARD
SIST EN 13160-7:2003
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13160-7May 2003ICS 23.020.01; 23.040.99; 29.260.20English versionLeak detection systems - Part 7: General requirements and testmethods for interstitial spaces, leak protecting linings and leakprotecting jacketsSystèmes de détection de fuites - Partie 7: Exigencesgénérales et méthodes d'essais pour les espacesinterstitiels, pour revêements intérieurs et revêtementsextérieurs protecteurs de fuitesLeckanzeigesysteme - Teil 7: Allgemeine Anforderungenund Prüfverfahren für Überwachungsräume,Leckschutzauskleidung und LeckschutzummantelungenThis European Standard was approved by CEN on 11 March 2003.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,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13160-7:2003 ESIST EN 13160-7:2003
EN 13160-7:2003 (E)2ContentspageForeword.31Scope.32Normative references.33Terms and definitions.44Material.45Type test of the interstitial space.55.1General.55.2Abbreviations and symbols.55.3Test equipment.55.4Proof of the tightness and the strength of the interstitial space.65.5Test of the free passage of liquid (only for vacuum systems).65.6Test of the free passage of air.75.7Flow rate test of the intermediate layer.75.8Determination of the flow resistance.95.9Determination of the interstitial space volume for class I-systems.126Leak protecting lining.146.1General.146.2Abbreviations and symbols.146.3Flexible leak protecting linings.146.4GRP-rigid leak protecting linings.207Leak protecting jacket.227.1General.227.2Materials.227.3Performance requirements.237.4Test.24SIST EN 13160-7:2003
EN 13160-7:2003 (E)3ForewordThis document (EN 13160-7:2003) has been prepared by Technical Committee CEN /TC 221, "Shop fabricatedtanks and equipment for storage tanks and for service stations", 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 orby endorsement, at the latest by November 2003, and conflicting national standards shall be withdrawn at the latestby November 2003.This European Standard consists of 7 parts:Leak detection systems;Part 1:General principlesPart 2:Pressure and vacuum systemsPart 3:Liquid systems for tanksPart 4:Liquid and/or vapour sensor systems for use in leakage containments or interstitial spacesPart 5:Tank gauge leak detection systemsPart 6:Sensors in monitoring wellsPart 7:General requirements and test methods for interstitial spaces, leak protecting linings and leak protectingjacketsAccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countriesare bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia,Spain, Sweden, Switzerland and the United Kingdom.1 ScopeThis European Standard specifies the type test of the interstitial space and the general requirements and testmethods for leak protecting linings and leak protecting jackets which are parts of leak detection systems.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. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 431, Resilient floor coverings — Determination of peel resistance.EN 495–5, Flexible sheets for waterproofing - Determination of foldability at low temperature - Part 5: Plastic andrubber sheets for roof waterproofing.EN 976–2, Underground tanks of glass-reinforced plastics (GRP) —Horizontal cylindrical tanks for non-pressurestorage of liquid petroleum based fuels — Part 2: Transport, handling, storage and installation of single wall tanks.SIST EN 13160-7:2003
EN 13160-7:2003 (E)4EN 1107-2:2001, Flexible sheets for waterproofing - Determination of dimensional stability - Part 2: Plastic andrubber sheets for roof waterproofing.EN 13160–1:2003, Leak detection systems — Part 1: General principles.EN 13160–2:2003, Leak detection systems — Part 2: Pressure and vacuum systems.EN ISO 62, Plastics - Determination of water absorption (ISO 62:1999).EN ISO 75–1, Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO75-1:1993).EN ISO 75–2, Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite (ISO75-2:1993).EN ISO 75–3, Plastics - Determination of temperature of deflection under load - Part 3: High-strength thermosettinglaminates and long-fibre-reinforced plastics (ISO 75-3:1993).EN ISO 175, Plastics - Methods of test for the determination of the effects of immersion in liquid chemicals (ISO175:1999).EN ISO 178, Plastics - Determination of flexural properties (ISO 178:2001).EN ISO 179-1, Plastics - Determination of Charpy impact properties - Part 1: Non-instrumented impact test (ISO179-1:2000).EN ISO 179-2, Plastics - Determination of Charpy impact properties - Part 2: Instrumented impact test (ISO 179-2:1997).EN ISO 527–1, Plastics - Determination of tensile properties - Part 1: General principles (ISO 527-1:1993 includingCorr 1:1994).EN ISO 527–3, Plastics - Determination of tensile properties - Part 3: Test conditions for films and sheets (ISO 527-3:1995).EN ISO 604, Plastics - Determination of compressive properties (ISO 604:1993).EN ISO 8501–1, Preparation of steel substrates before application of paints and related products - Visualassessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates andof steel substrates after overall removal of previous coatings (ISO 8501-1:1988).ISO 554, Standard atmospheres for conditioning and/or testing — Specifications.ISO 2528, Sheet materials - Determination of water vapour transmission rate - Gravimetric (dish) method.ISO 4593, Plastics; film and sheeting; determination of thickness by mechanical scanning.ISO 6133, Rubber and plastics - Analysis of multi-peak traces obtained in determinations of tear strength andadhesion strength.3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in EN 13160-1:2003 apply.4 MaterialFor leak protecting linings: polyvinyl chloride (PVC) and polyurethane (PUR) according to 6.3;SIST EN 13160-7:2003
EN 13160-7:2003 (E)5 glass reinforced plastics (GRP) according to 6.4.For leak protecting jackets according to 7.2.5 Type test of the interstitial space5.1 GeneralThe construction of the interstitial space and the free passage of liquid shall be tested with the aid of a constructiondrawing and a sample of a tank or pipe.5.2 Abbreviations and symbolsgis the force of gravity, in metres per second squaredhis the maximum filling height of the tank, in metrespMSis the maximum possible surface pressure, in Pascalp0is the ambient pressure, in PascalpPAis relative pressure at control point "pump off", in Pascalp1is the relative vacuum pressure, in Pascalp2is the relative pressure in the interstitial space after the admission test, in Pascalp2absis the pressure in the interstitial space after the admission test (p0 + p2), in Pascalpis the differential pressure between the pressure before and after the admission of the air, in Pascals1is the initial thickness of the intermediate layer, in millimetress2is the residual thickness of the intermediate layer after loading with 50 kPa, in millimetress3is the half of the residual thickness s2, in millimetresVGis the volume of the water filled vessel and the volume of the connection hose, in litresVwis the volume of the flowed in water, in litresVzis the volume of the receiver tank, in litresV1 is the volume of the interstitial space, in litres is the density of the stored material in the tank, in kilograms per cubic metre.5.3 Test equipmentreceiver tank, volume 50 l to 80 l. The receiver tank shall have two ball valves in the top surface for connection withthe interstitial space and the vacuum pump and a drain cock with a connected hose assembly at the lowest point;vessel with a graduation, volume at least 10 l;measuring device for pressure (eg manometer), accuracy 0,6 % of the maximum graduated value;measuring device for the volume flow, accuracy 2 % of the measured value;pressure pump;SIST EN 13160-7:2003
EN 13160-7:2003 (E)6vacuum pump.5.4 Proof of the tightness and the strength of the interstitial space5.4.1Test objectiveThe test objective is to ensure that the integrity of the interstitial space is maintained under all operating pressures.5.4.2EvaluationThe test shall be deemed to have been passed if the following condition is fulfilled:tVppEB1)(10in Pa l s-1wherepB is the pressure at the beginning of the test, in Pascalpis the pressure at the end of the test, in Pascalt is the test time, in secondsV1 is the volume of the interstitial space, in litres5.4.3Test methodThe test shall be carried out at a temperature above the freezing point of water but not exceeding + 40 °C.The tightness and the strength of the interstitial space shall be proved by a pressure test on a sample of a tank orpipework at ambient pressure in the tank or pipework.The difference of the ambient temperature shall be within a range of 1 K at the beginning and at the end of the test.The following minimum test pressures shall be used: for interstitial spaces, which are part of a leak detection system working on the basis of liquid or pressure at 1,1times of the set pressure of the pressure relief valve, but at least at 60 kPa (0,6 bar) pressure; for the interstitial spaces, which are part of a leak detection system working on the basis of vacuum at1,1 times of the negative operating pressure of the leak detector and at 1,1 times of the internal operatingpressure of the pipework or the tank at pressurisation of the pipework or tank at the same time.5.5 Test of the free passage of liquid (only for vacuum systems)5.5.1PreparationFor the test the vacuum leak detector shall be connected to either the actual interstitial space for the tank or pipe or a representative sample of the interstitial space of at least 1600 mm
900 mm.The test sample shall include any seams/welds and intermediate layer and shall have at least two test nozzles at adistance of 1500 mm apart.5.5.2EvaluationThe test is deemed to have been passed if the leak detector triggers an alarm, after the quantity of liquid, calculatedaccording to EN 13160–2:2003, Equation (3), has entered the interstitial space.SIST EN 13160-7:2003
EN 13160-7:2003 (E)75.5.3Test methodThe test shall be carried out at a temperature above the freezing point of water.The admission of the test medium shall be made through that test nozzle, where the distance to the connection pieceof the leak detector is the greatest, until the alarm at the leak detector is released. The passage for the stored productshall be checked by direct admission of water. If the viscosity of the stored product exceeds the viscosity of water, thetest shall be carried out directly with the stored product or with a comparable liquid. The pressure in the interstitialspace shall be recorded by a manometer fitted at a test nozzle of the interstitial space and the switching points of theconnected leak detector have to be controlled.5.6 Test of the free passage of air5.6.1EvaluationThe test shall be deemed to have been passed, if after opening of the interstitial space due to drilling a 2 mm hole airis deflated in the interstitial space at the pressure system and the pressure in the interstitial space falls or at thevacuum system air is sucked into the interstitial space due to drilling a 2 mm hole, so that the pressure in theinterstitial space increases immediately.5.6.2PreparationA manometer shall be connected to a nozzle for the leak detector at the interstitial space. Further nozzles shall betightly shut by a stop valve. The interstitial space shall be evacuated by an externally connected vacuum pump to avacuum of -60 kPa for vacuum systems. For pressure systems the interstitial space shall be pressurized by anexternally pressure pump to a pressure of + 60 kPa.5.6.3Test methodThe test shall be carried out at a temperature above the freezing point of water.The free passage of the interstitial space of the sample of the tank or pipework shall be tested by sampling by meansof borings with a drill (2 mm) at positions determined by the person during the test. The pressure or vacuum reachedbefore the test is carried out shall be reduced within a short time according to the capacity of the interstitial space bycharging and discharging and shall be visible at the manometer.5.7 Flow rate test of the intermediate layer5.7.1Test objectiveThe test objective is to ensure a suitable passage for air, stored product and/or water.5.7.2Test equipmentThickness tester, with an accuracy of 0,01 mm;two quadratic steel retaining plates 100 mm
100 mm, thickness 10 mm;two quadratic steel pressure plates 150 mm
150 mm, thickness 10 mm, with a hole of 10 mm each in the cornersphere. One steel plate has a hole in the middle of the plate with a diameter of 6 mm and a fitting with a diameter of6 mm is also welded on in the middle of the plate;four locking screws, 8 mm;compression device, with an accuracy of 1 %;air impermeable foil, e. g. PE 0,75 mm thickness;environmental chamber;vacuum pump;SIST EN 13160-7:2003
EN 13160-7:2003 (E)8measuring device for the volume flow.5.7.3PreparationThe tests shall be carried out at least at three quadratic test samples with the dimensions of 100 mm
100 mm.5.7.4EvaluationThe test shall be deemed to have been passed, if the air current back pressure emanating from the intermediate layeris not less than - 1 kPa (10 mbar) at a volume flow of (85 ± 15) l/h of air.For protecting the lining the intermediate layer shall be tested at 1,3 times the maximum possible surface pressure(pMS) – but a minimum of 50 kPa (0,5 bar).For protecting the jacket the intermediate layer shall be tested at 1,3 times the maximum possible surface pressure(pMS) – but a minimum of 100 MPa (1000 bar).Maximum possible surface pressure according to Equation (1):pMS =
g
h + pPA(1)5.7.5Test methodThe test shall be carried out at a temperature of (20 ± 5) C. First the initial thickness of the intermediate layers (s1)shall be measured with the thickness tester. After the measurement the intermediate layers shall be laid between thetwo test plates. Through the upper test plate the test samples shall be charged with the help of the compressiondevice: for linings with the calculated maximum possible surface pressure (pMS), but a minimum of 50 kPa; for jackets with 1,3 times the maximum possible surface pressure (pMS), but a minimum of 100 MPa.After reaching the steady state condition but not before a minimum period of 14 days has elapsed the residualthickness (s2) shall be measured and the test equipment shall be installed in the environmental chamber. The testsamples shall be charged further with the maximum possible surface pressure (pMS) and the measurement of thethickness shall be repeated at the limiting temperatures of the given operating conditions as mentioned in 5.1 ofEN 13160-1:2003. The steady state condition has been reached, if two measurements of the residual thickness (s2)made at intervals of 24 h do not differ by more than 1 % from the thickness (s1). If after 90 days the steady statecondition has not been achieved the test has failed. Following this test the intermediate layers shall be pressed withthe help of the pressure plates and the locking screws until half of the residual thickness of the intermediate layers (s3)has been achieved or the pressure exceeds 2
pMS.At the fittings, located in the middle of the plate, a vacuum pump with an inserted measuring device for pressure, egu-tube, shall be connected. At the exit of the vacuum pump a valve for throttling the volume flow shall be installed, sothat the volume flow can be adjusted to the given value of 85 l/h through the secondary measuring device for thevolume flow. The length of the connecting line of the manometer to the fittings of the interstitial space shall be250 mm. The flexible connecting lines at the connection of the vacuum pump and the measuring device for thevolume flow shall be realized with an internal diameter of 6 mm.The total length of the connecting line from the fittings to the vacuum pump shall be max. 1 m for the measurements.After installation of the test equipment as mentioned above and in Figure 1 the flow resistance shall be taken from themeasuring device for pressure after turning-on the vacuum pump and adjusting the volume flow to 85 l/h. Themeasurement shall be repeated at each test sample. The mean of the measured values shall be compared with thelimiting value of -1 kPa.SIST EN 13160-7:2003
EN 13160-7:2003 (E)9Dimensions in millimetresKey1 Connection for vacuum pump with 85 l/h air2 Measuring device for pressure3 Test plate4 Intermediate layer5 Air impermeable foilTest sampleInitial thicknesss1MmRes. thickness at pMSafter loading s2mm1/2 residualthickness s2s3mmflow back pressure at a flow of85 l/h air(set-up as shown)kPaFigure 1 — Flow rate test set-up5.8 Determination of the flow resistance5.8.1GeneralThe flow resistance for the interstitial space shall be determined by means of the test arrangement in Figure 4 to 6.5.8.2EvaluationThe test shall be deemed to have been passed, if the flow resistance shown at the u-tube does not exceed thevalue of - 1 kPa when sucked with an air volume flow of 85 l/h is applied through a vacuum pump fitted at theinterstitial space.Before the test is carried out according to 5.1 to 5.7 the suitability of the type of the interstitial space shall be provedas described below.SIST EN 13160-7:2003
EN 13160-7:2003 (E)10In case of materials of the interstitial space where the resistance with respect to the stored product is not proved,the test specimen shall be stored for at least two months in the respective stored product or in a comparable testingliquid. Through the test nozzles of the test specimen the liquid shall be passed into the interstitial space until it isfull. After the storage time has expired the interstitial space shall be evacuated and dried so that the measurementfor determination of the flow resistance can be made, whilst the above mentioned limiting values shall bemaintained. After conclusion of the measurement the test specimen shall be opened and the condition of theinterstitial space shall be checked visually with respect to free passage.5.8.3PreparationFor the test at the test specimen a test piece according to the type of the interstitial space in dimensions of500 mm
500 mm with four test nozzles installed at a distance of 400 mm has to be put at disposal. One testnozzle serves as the opening of ventilation. At a second test nozzle a vacuum pump shall be installed with amanometer inserted, e. g. a u-tube. The length of the connecting line of the manometer up to the connecting nozzleshall be 250 mm.The sides of the test specimen shall be closed gas tight. At the exit of the vacuum pump a flow control valve shallbe installed, so that the volume flow can be adjusted by the downstream volume indicator to the given value of85 l/h (Figure 2). The flexible interconnection lines for the connection of the leak detector and the volume indicatorshall be designed with an inside diameter of 6 mm. The entire length of the interconnection line of the connectingnozzle up to the u-tube shall be 1 m for the measurement.Dimensions in millimetresKey1 Test nozzle
4 mm2 Measuring device for pressure3 Vacuum pump with constant volume flow of 85 l/h4 Measuring instrument for volume flow5 Interstitial space of the test sampleFigure 2 — Suitability test of the construction of the interstitial spaceWith tanks, the tests for determination of the flow resistance shall be carried out at three further test nozzles, whichshall be distributed over the tank circumference. With pipeworks, additionally to the connecting nozzles for the leakdetector and to the test nozzles, two further test nozzles shall be installed at a distance of 2,5 m apart to thenozzles already available. The testing apparatus shall be installed according to Figure 3 and Figure 4.SIST EN 13160-7:2003
EN 13160-7:2003 (E)11Key1 Valve2 Interstitial space3 Measuring device for pressure4 Vacuum pump with constant volume flow of 85 l/h5 Measuring instrument for volume flowFigure 3 — Test set-up for the determination of the flow resistance of the interstitial space of tanksKey1 Valve2 Measuring device for pressure3 Vacuum pump with constant volume flow of 85 l/h4 Measuring instrument for volume flow5 Double skin pipework if needed with formed pieces and fittingsFigure 4 — Test set-up for the determination of the flow resistance of the interstitial space of pipeworkSIST EN 13160-7:2003
EN 13160-7:2003 (E)125.8.4Test methodThe test shall be carried out at a temperature above the freezing point of water.After installation of the test apparatus as shown above, the flow resistance shall be taken from the manometer afterstarting the vacuum pump and adjusting the volume flow to 85 l/h. The measurement shall be repeated at each testnozzle, whilst the test nozzle with the greatest distance from the measuring nozzle shall be opened. The measuredvalues shall be recorded and compared with the limiting value of -1 kPa.5.9 Determination of the interstitial space volume for class I-systems5.9.1Test objectiveThe test objective is to ensure that the interstitial space volume for class I systems does not exceed 8 m3 for a tankand 10 m3 for a pipe such that the class I type test procedure can be carried out.5.9.2EvaluationThe volume of the interstitial space shall be determined by calculation and by admission tests. The test shall bedeemed to have been passed if the measured volume of the interstitial space is within 20 % of the calculated valueand if it does not exceed 8 m3 for tanks and 10 m3 for pipes.5.9.3Admission testsAir or water of a defined volume shall be entered to determine the volume of the interstitial space. A receiver tankwith a volume of 50 l to 80 l shall be arranged in line for that admission test.5.9.4PreparationThe test shall be carried out at a temperature above the freezing point of water.For tanks and pipes one sample shall be chosen which is representative for the used construction method. Thelength of the sample of the pipework shall be at least 10 m. All fittings shall be included in the sample of thepipework.The interstitial space shall be evacuated by a vacuum pump connected to the suction or pressure nozzle until avacuum of at least 60 kPa has been reached. The manometer shall be connected with one of these nozzles. Thevacuum p1 shall be documented before the admission test start. The receiver tank shall be connected with a furtherfitting of the interstitial space. The receiver tank shall have the ambient pressure during the admission test with air,see Figure 5. The receiver tank shall have vacuum together with the interstitial space during the admission test withwater, see Figure 6.Key1 Valve2 Measuring device for pressure3 Interstitial space4 Three way valve with a connection for a vacuum pump5 Receiver tankFigure 5 — Test set-up for the admission test on fieldSIST EN 13160-7:2003
EN 13160-7:2003 (E)13 Admission test with airAn opening of the interconnection line between the interstitial space and the receiver tank leads to a pressurecompensation between the receiver tank and the interstitial space (in the receiver tank is the ambient pressure p0).All other openings of the receiver tank shall remain closed. The changed pressure p2 shall be measured after thepressure compensation and shall be used for the calculation of the volume of the interstitial space. The volume ofthe interstitial space shall be calculated according to Equation (2)p
= 2z1pVV (2) Admission test with waterWater shall be available in a vessel with a graduation, volume at least 10 l. A connection hose from the receivertank shall be immersed into the water filled vessel, see Figure 6.Key1 Valve2 Measuring device for pressure3 Interstitial space4 Three way valve with a connection for a vacuum pump5 Receiver tank6 Vessel for waterFigure 6 — Test set-up for the admission test with water in laboratoryBy opening the connection hose between the water filled vessel and the receiver tank a given volume of water isflowed into the receiver tank by the there prevailing vacuum. The entered volume shall be measured. Theadmission test shall be repeated 10
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