EN 27841:1991
(Main)Automatic steam traps - Determination of steam loss - Test methods (ISO 7841:1988)
Automatic steam traps - Determination of steam loss - Test methods (ISO 7841:1988)
Specifies two test methods for steam traps. The object of these tests is to determine the amount of live steam, if any, that is lost through the steam trap. There is no measurement of the total heat energy lost by the trap. Such total heat loss would include radiation and convection components which can be established separately. Figure 1 shows the test arrangement for test method A, and figure 2 shows the test arrangement for test method B.
Kondensatableiter - Bestimmung des Dampfverlustes - Prüfverfahren (ISO 7841:1988)
Purgeurs automatiques de vapeur d'eau - Détermination de la perte de vapeur - Méthodes d'essai (ISO 7841:1988)
La présente Norme internationale spécifie deux méthodes d'essai permettant de déterminer la perte de vapeur des purgeurs automatiques de vapeur d'eau conformes à l'ISO 6552. Le but de ces essais est de définir la quantité de vapeur vive éventuellement perdue par le purgeur. Il s'agit donc d'essais relatifs à la capacité de refermeture des purgeurs après fonctionnement. Il ne s'agit pas d'une mesure de la perte totale d'énergie thermique par le purgeur. Cette perte totale inclurait des phénomènes de rayonnement et de convection qu'on pourrait déterminer séparément.
Avtomatični izločevalniki kondenzata - Ugotavljanje izgube pare - Preskusne metode (ISO 7841:1988)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kondensatableiter - Bestimmung des Dampfverlustes - Prüfverfahren (ISO 7841:1988)Purgeurs automatiques de vapeur d'eau - Détermination de la perte de vapeur - Méthodes d'essai (ISO 7841:1988)Automatic steam traps - Determination of steam loss - Test methods (ISO 7841:1988)23.060.01Ventili na splošnoValves in generalICS:Ta slovenski standard je istoveten z:EN 27841:1991SIST EN 27841:2000en01-september-2000SIST EN 27841:2000SLOVENSKI
STANDARD
SIST EN 27841:2000
SIST EN 27841:2000
SIST EN 27841:2000
INTERNATIONAL STANDARD 7841 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOJJHAR OPTAHM3A~Mfl fl0 CTAH~APTM3A~MM Automatic steam traps - Determination of steam loss - Test methods Purgeurs automatigues de vapeur d’eau - Dbermina tion de Ia perte de vapeur - M&hodes d’essai ISO First edition 1988-12-01 Reference number ISO 7841: 1988 (E) SIST EN 27841:2000
ISO7841 :1988 (EI Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7841 was prepared by Technical Committee ISO/TC 153, Valves. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its Jatest edition, unless otherwise stated. l 0 International Organkation for Standardkation, 1988 Printed in Switzerland SIST EN 27841:2000
INTERNATIONAL STANDARD ISO 7841 : 1988 (EI Automatic steam traps - Determination of steam loss - Test methods 1 Scope and field of application This International Standard specifies two test methods to determine the steam loss of automatic steam traps to ISO 6552. The Object of these tests is to determine the amount of live steam, if any, that is lost through the steam trap. They are, therefore, tests to evaluate the ability of the traps to shut against steam during successive operations. There is no measurement of the total heat energy lost by the trap. Such total heat loss would include radiation and convec- tion components which tan be established separately. 3 Test arrangements The Pest arrangements for steam loss determination are shown in figures 1 and 2. The minimum water capacity of the calorimeter tank (sec figure 1) shall be 0,02 m3. lt is most im- portant that the condensate drainage device be fully capable of maintaining a dry line to the heat exchanger. The test device shall be located sufficiently below the heat exchanger to pre- vent condensate backing up into the heat exchanger, should the test device only operate infrequently. All piping and equipment (including the heat exchanger) shall be insulated to a value of R > 0,75 x 10-3 rn2. OC 9 h J 2 References ISO 651, Solid-stem calorimeter thermometers. ISO 652, Enclosed-scale calorimeter thermometers. ISO 653, Long solid-stem thermometers for precision use. ISO 4185, Measurement of liquid flow in closed conduits - Weighing me thod. ISO 6552, Automatic steam traps - Definition of technical terms. to reduce thermal losses to a minimum. The instruments used for the measurements shall comply with International Standards, if such Standards exist, e.g. - ISO 651, ISO 652, ISO 653 for temperature measurements; - ISO 4185 for flow measurements. The condensate removal device shall not be modified in any way from its commercial form. 1 SIST EN 27841:2000
Valve 5 Cooling watet- in Valve 1 Steam in D 8 S . . . I u l ap n . . Valve 2 T Condensate drain device Heat exchanger Valve 4 1 Vacuum breaker 1) Cooling water out To drain Valve 6 Vented cover or plastic ball: L To drain Valve 7 To drain i e 1 ---rn- I e 2- mf Calorimeter tank *$z!d-J Exchanger water tank m 3 m4 Figure 1 - Test arrangement for steam. loss tests with test method A 1) Operating at steam temperature. SIST EN 27841:2000
The test may be carried out at a pressure corresponding to the maximum working pressure of the trap, the test pressure not exceeding 32 bar’) with saturated steam (238 OC). Load testing shall be carried out at 1 % of the
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