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1、INTERNATIONAL STANDARD IS0 789-8 First edition 1991-I l-01 Agricultural tractors - Test procedures - Part a: Engine air cleaner Tracteurs agricoles - MCthodes d essai - Partie 8: Filtre ZJ air du moteur Reference number IS0 789-8 1991(E) Copyright International Organization for Standardization Provi
2、ded by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789-8:1991 (E) Foreword IS0 (the International Organization for Standardization) is a worldwide federatio
3、n of national standards bodies (IS0 member bodies) The work of preparing International Standards is normally carried out through IS0 technical committees Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. I
4、nternational organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technic
5、al committees are circulated to the member bodies for voting Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 789-8 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and f
6、orestry, Sub- Committee SC 2, Common tests IS0 789 consists of the following parts, under the general title Agricul- fural tractors - Test procedures: - Part I: Power tests for power take-off - Part 2: Rear fhree-point linkage lifting capacity - Part 3: Turning and clearance diameters - Part 4: Meas
7、urement of exhaust smoke - Pat-f 5: Partial power PTO - Non-mechanically transmitted power - Part 6: Centre of gravity - Part 7: Ax/e power determination - Part 8: Engine air cleaner - Part 9: Power tests for drawbar - Part IO: Measuremenf of hydraulic power - Tractor/implement interface 0 IS0 1991
8、All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, Including photocopying and microfilm, without permission In writing from the publisher. International Organization for Standardization Case Postale 56 * CH-1211 Gen b
9、) the mode of failure and its location (if any); c) torques applied to fixing initially and at the end of the test: d) the number of cycles to failure or the number of cycles completed; e) the result of the full life efficiency and capacity test 3 Copyright International Organization for Standardiza
10、tion Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789- dry cotton lint, ranging in fibre length from 3 mm to 30 mm, dried to less than 10 % moist
11、ure. The cotton lint collected from the inlet of the engine radiator of a cotton picker or cotton stripper will be suitable Other materials such as leaf par- ticles and dust will be included in cotton lint col- lected in this manner, but such inclusion is not objectionable in this test material. 8.3
12、 Fibrous material preparation Before using the fibrous material, a quantity suffi- cient to cover the test requirements shall be teased out and allowed to stabilize at a temperature of (23 then gently shake to remove any loose droplets of water and reweigh it 9.2.1.5 Re-assemble the filter unit/test
13、 rig. Increase the air flow through the element until the pressure drop/restriction reaches 100 mbar or the rated flow is achieved Remove and inspect the element Re- 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/
14、9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789-8:1991 (E) cord any damage which has occurred to any of the component parts of the element or to its integrity 9.2.1.6 Re-assemble the filter unit/test rig and run air thr
15、ough the filter at the rated flow until either the pressure drop or its mass return to those deter- mined in 9.2.1.1 or 9.2.1 2 If this does not occur then run the system until the mass of the element has stabilized 9.2.1.7 Weigh the element. 9.2.1.8 Perform a dust holding capacity and overall effic
16、iency test as specified in IS0 5011 1988, clause 7 5. 9.2.2 Results to be recorded The test report shall indicate the following a) the initial mass: b) the wet mass, c) the mass of retained moisture; d) the mass after drying. 10 Safety element 10.1 Introduction The requirement of a safety element is
17、 that it should block rapidly in the event of a leak occurring in the primary element, passing a minimum of dust in the process To evaluate this, a specific penetration test shall be performed During normal and correct op- eration of the air cleaning system, it is desirable that the safety element s
18、hould not block during the lives of one or more primary elements To evaluate this, a safety element blocking test shall be performed This may be carried out as part of the full life effi- ciency and capacity test as specified in IS0 5011 1988, clause 7 5. 10.2 Specific penetration test 10.2.2 Test p
19、rocedure The test shall be conducted in accordance with IS0 5011.1988, clause 7 5, full life efficiency and ca- pacity test, but with the following specifications. 10.2.2.1 The terminating condition for dust feeding shall be a pressure drop across the housing of 100 mbar. 10.2.2.2 The dust used shal
20、l be fine grade. Where a precleaner is provided, an additional test shall be carried out using coarse dust 10.2.2.3 The air flow shall be the full rated air flow as agreed between the customer and supplier 10.2.2.4 The dust concentration used shall be 1 g/ms, unless this results in the test duration
21、 being less than 0,5 h, in which case the test shall be car- ried out with a dust concentration of 0,l g/m3 10.2.2.5 Where applicable, the requirements of IS0 5011 1988, clauses 7 8 1 and 7 8 1 1 (precieaner dust removal) shall be met The precleaning efficiency will be slightly below normal during t
22、his test However, should a large re- duction be noted, the reasons for this should be checked and any observations recorded 10.2.2.6 At the end of the test, prior to measuring efficiency, the flow rate shall be increased to pro- duce a pressure drop across the housing of 125 mbar The safety element
23、shall not rupture un- der these conditions. 10.2.3 Calculation and requirement To evaluate the results, the specific dust penetration SDP, in grams per cubic metre per minute, shall be calculated as follows m SDP=q, where m is the mass of dust passing the system, in grams: 4v is the air flow, in cub
24、ic metres per min- ute. This value shall not exceed 0,7 g/(ms/min) 10.2.1 Preparation Using the housing normally employed to retain the safety elements, prepare a “ dummy” primary ele- ment, i.e. a complete element skeleton lacking only the media, but including any swirl vane present Fit the safety
25、element and the dummy primary element into the housing. 10.3 Safety element blocking test 10.3.1 Preparation Use a clean primary element and safety element in the housing normally employed The mass of the 5 Copyright International Organization for Standardization Provided by IHS under license with I
26、SO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789-8:1991 (E) safety element after conditioning for 24 h in the test environment shall be determined 10.3.2 Test procedure 10.3.2.1 Set
27、 up the air cleaner as in IS0 5011 1988, clause 6.3 Measure and record the restriction/ pressure drop of the unit at the rated flow only. Re- place the primary element and retain the original for later reference. 10.3.2.2 Conduct a full life efficiency and capacity test as specified in IS0 5011:1988
28、, clause 7 5 10.3.2.3 Replace the primary element with the ref- erence one used at the start of the test. Repeat the restriction and pressure drop test in 10 3 2 1 Note the result 10.3.2.4 Remove the safety element and reweigh as in 10.3.1 gether with the increase in mass of the safety ele- ment 11
29、Angle of operation of oil-bath air cleaners Carry out the appropriate tests as specified in IS0 5011 1988, clause 8.4 7 with the air cleaner pos- itioned at the attitude which it would adopt if the vehicle to which it is fitted were at an angle of pitch of + 25” and an angle of roll of &- 17” 12 Aut
30、omatic dust unloading valves The satisfactory operation of automatic dust un- loading valves cannot be assessed other then on the engine to which the air cleaner is to be fitted, in- cluding additional precleaners or rain caps in a re- alistic dust environment. 13 Reports 10.3.3 Presentation of resu
31、lts The increase in restriction/pressure drop of the unit shall be calculated from 10 3 2.1 and 10 3 2.3, to- Present the results of the tests in the form of the specimen test report shown in annex A of this part of IS0 789 and in IS0 5011.1988, annexes E, F and G, stating clearly the conditions und
32、er which the tests were carried out Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789-8:1
33、991(E) Annex A (normative) Test report Location of failure. . . . . . . . . . . . . 1 . Mode of failure (if any). . . . . . . Torques applied to fixing - initially: . . . . . . . . . . . . . . . . . . at end of test . . . Number of cycles to failure/completed . . . . Resistance to moisture of dry ai
34、r cleaner element Initial mass. . . . . . . . . . . . . . . . . . . Wet mass . . . . . . . . . . . . . . . . . . Mass of retained moisture ._ .: . ._ Mass after drying. . . . . . . . . . . . . . ,. . The specimen test report shown in IS0 5011.1988, annex E shall be used with the following additions,
35、 as ap- propriate. Resistance to vibration Amplitude of vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mm Freauencv of vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nm . . . . . . . . . . . . . . . . . . . . . . . Nm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . . . . 9 . . . . . . . . cl . . . . . . . . . . . . 9 7 Copyright
37、International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 789-8:1991(E) UDC 631.372-73:620.1 Descrtptors: agric
38、ultural machinery, tractors, agricultural tractors, air cleaners, alr filters, tests, performance tests. Price based on 7 oases Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,-