1、DEUTSCHE NORM SeDtember 1997 Underground tanks of glass-reinforced plastics (GRP) English version of DIN EN 977 Method for one side exposure to fluids DIN EN 977 ICs 23.020.10 Descriptors: Tanks, fuel storage, testing. Unterirdische Tanks aus textilglasverstrkten Kunststoffen (GFK) - Prfanordnung zu
2、r einseitigen Belastung mit Fluiden European Standard EN 977 : 1997 has the status of a DIN Standard. National foreword This standard has been prepared by CEN/TC 21 O. The responsible German body involved in its preparation was the Normenausschu Chemischer Apparate- bau (Process Engineering Standard
3、s Committee). EN comprises 5 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN 977 : 1997-0 V Deutsches Institut fr Nonung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). . English pri
4、ce group O7 Sales No. 1107 02.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 977 July 1997 ICs 23.020.1 O Descriptors: Tanks, fuel storage, testing. English version Underground tanks of glass-reinforced plastics (GRP) Method for one side exposure to fluids Rservoirs enterrs en plastiques re
5、nforcs de verre (PRV) - Mthode dexposition unilatrale dune plaque aux fluides Beaufschlagung mit Fluiden Unterirdische Tanks aus textilglas- verstrkten Kunststoffen (GFK) - Prfanordnung zur einseitigen This European Standard was approved by CEN on 1997-06-21. CEN members are bound to comply with the
6、 CENKENELEC 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 Central Secretariat or
7、to any CEN member. The European Standards exist 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 Central Secretariat has the same status as the official version
8、s. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization
9、Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1997. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 977 : 1997 E Page 2 EN 977 : 1997 Contents Foreword 1
10、Scope 2 Principle 3 Apparatus 4 Test parameters 5 Test specimens 6 Procedure 7 Test report Page 2 3 3 3 3 3 5 5 Foreword This European Standard has been prepared by Technical Committee CEN/TC 21 O “GRP tanks and vessels“, the secretariat of which is held by DIN. This European Standard shall be given
11、 the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1998, and conflicting national standards shall be withdrawn at the latest by January 1998. This standard is drafted in support of EN 976-1 and EN 976-3. Horizontal cylindrical t
12、anks for the non- pressure storage of liquid petroleum based fuels - Part 1 : Requirements and test methods for single wall tanks - and Part 3 : Requirements and test methods for double wall tanks, in order to assess the chemical resistance of the GRP tank laminate. According to the CENKENELEC Inter
13、nal Regulations, the national standards organizations of the following countries 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
14、and the United Kingdom. Page 3 EN977 :1997 1 Scope This European Standard specifies a method for the one side exposure to fluids of samples of tanks of glass reinforced thermosetting resins for the underground storage of liquids. 2 Principle The inner surface of test specimens taken from the tank wa
15、ll are exposed at a specified temperature for a given period of time to the liquid and vapour phase of a test liquid. 3 Apparatus Modifications in the construction of the apparatus as given hereafter are allowed, provided that the essence of the test is not affected. The apparatus (see figure 1) con
16、sists of a glass cylinder with a diameter of 140 to 150 mm and a height of 150 mrn The cylinder contains two connections at an angle of 45“, one for a backflowcooler (1) and one for the adjustment of a thermometer (2). Further parts are the joint for the backflowcooler and the backflowcooler itself.
17、 These parts are not given in figure 1 since they are readily available items. The glass parts of the apparatus shall be made of glass resistant to temperature changes. Two test specimens serve as top and bottom of the glass cylinder. They are sealed against the polished rims of the cylinder with ri
18、ngs, e.g. PTFE. The sealing is adapted to the shape of the samples. The test specimens are clamped to the glass cylinder between two flanges by means of six threaded rods with butterfly nuts. It is recommended to apply a spacer ring between each pressure flange and the test specimen. (These spacer r
19、ings are not detailed in figure 1). The glass cylinder is heated from the outside with an automatic controlled heating system. The temperature is measured in the test liquid. The heating system shall be capable of keeping the temperature of the test liquid to within 1 K of the specified temperature.
20、 4 Test parameters The test parameters (temperature, exposure time and test liquid composition) are given by the relevant product standard. 5 Test specimens Take three representative hexagonal test specimens from the tank wall. Reserve one of the test specimens for the determination of the initial v
21、alue(s) of the characteristic(s) defined by the relevant product standard, the other two for exposure to the liquid and vapour phase of the test liquid. Mark the longitudinal and circumferential direction of the cylindrical part on the outside of the test specimen. Page 4 EN 977 : 1997 Dimensions in
22、 mm 1 Flange 7 Liquid level 2 Test specimen (gas phase) 3 Gasket (e.9. PTFE) 4 Six threaded studs M6 x 200 with butterfly nuts 5 Connection tube 11 Flange 6 Glass cylinder 8 Heathing element 9 Gasket (e.g. PTFE) 10 Test specimen (liquid phase) Figure 1 : Apparatus for exposure to liquids Page 5 EN 9
23、77 : 1997 In case of a sandwich construction the test specimens are taken from the inner GRP laminate. NOTE : If a different exposure apparatus is used, different form and dimensions of test specimens may be necessary. 6 Procedure 6.1 Clamp two test specimens in the apparatus with the inner layer to
24、 the inside. When necessary, adapt the rings to the shape of the test specimens. 6.2 Fill half of the glass cylinder with the test liquid (approximately 1200 ml in case of the figure 1 cylinder). 6.3 Increase gradually the temperature of the liquid to the specified temperature. Maintain that tempera
25、ture to within 1 K over the complete exposure period. 6.4 During the test, replace the test liquid as required by the relevant product standard. 6.5 At the end of the exposure time cool the test liquid down to (23 t 5) “C and remove the liquid from the cylinder. 6.6 Take the two test specimens out o
26、f the apparatus and rinse them with distilled water. Remove non water soluble liquids with a solvent that does not affect the test specimen (e.g. white spirit). NOTE : Mechanical cleaning of the test specimens is not allowed, given the risk of damaging the surface 6.7 Dry the test specimens in air a
27、t a temperature of (23 f 5) OC. 6.8 Determine on the exposed test specimens the characteristic(s) as required by the relevant product standard within 24 h of removal of the test specimens from the test apparatus. 7 Test report The test report shall at least indicate a) a reference to this European S
28、tandard; b) the full identification of the tank from which the test specimens are taken - name of producer and production place; - build up of the material, name and type of the material; - tank marking, including production code; - dimensions of the test sample; c) any deviation from the exposure a
29、pparatus as specified in this European Standard; d) the test parameters (test temperature, exposure time, drying time and test liquid composition); e) individual values and mean values of the characteristic(s) determined on exposed and unexposed test specimens, as well as the change of the mean value in percentage; f) any deviation from the test procedure specified in this Standard; g) any details, which have not been provided for by this test procedure, and any accidental circumstances which might have affected the results; h) the date(s) of testing
