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1、BRITISH STANDARD AEROSPACE SERIES BS 2M 52:1989 ISO 6772:1988 (Superseding British Standard M52:1983) Method for Impulse testing of hydraulic hose, tubing and fitting assemblies for aerospace fluid systems UDC 629.7.063:621.643:620.1 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GM
2、T+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 29 September 1989 BSI 01-2000 The following BSI reference
3、s relate to the work on this standard: Committee reference ACE/-/1 Draft for comment 87/74140 DC ISBN 0 580 17447 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/-
4、/1, upon which the following bodies were represented: British Airways Civil Aviation Authority (Airworthiness Division) Ministry of Defence Society of British Aerospace Companies Limited Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue
5、 Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Requirements1 4Principle of test2 5Test method2 6Intended use3 Table 1 Peak pressure and ra
6、te of pressure rise2 Table 2 Sequence and duration of impulse testing at temperature3 Figure Impulse trace1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 ii BSI 01-2000 National forew
7、ord This British Standard has been published under the direction of the Aerospace Standards Policy Committee. It is identical with ISO 6772:1988 “Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assemblies”, published by the International Organization for Standardization
8、 (ISO). It supersedes British Standard M52:1983 which is withdrawn. ISO 6772 was produced as a result of international discussion in which the UK took an active part. The Technical Committee has reviewed the provisions of ISO 8575, to which reference is made in the text, and has decided that they ar
9、e acceptable for use in conjunction with this standard. A corresponding British Standard is expected to be published. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a
10、 British Standard does not of itself confer immunity from legal obligations. Cross-reference International StandardCorresponding British Standard ISO 6771:1988British Standard M 51:1989 Classification for pressure and temperature for fluid systems and components (Identical) Summary of pages This doc
11、ument comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed C
12、opy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 BSI 01-20001 1 Scope and field of application This International Standard specifies the requirements and the procedures for impulse testing of hose, tubing, and fitting assemblies for use i
13、n aerospace hydraulic systems. Requirements may apply, when appropriate, to components used in other aerospace fluid systems. 2 References ISO 6771, Aerospace Fluid systems and components Pressure and temperature classifications. ISO 8575, Aerospace Fluid systems Hydraulic system tubing1). 3 Require
14、ments 3.1 Shape of impulse trace When observed on an oscilloscope, the impulse traces show as approximate pressure/time cycles. It is mandatory that these pressure/time curves be confined to the shaded area indicated in the Figure, and that the dynamic impulse trace produced by the test machine shal
15、l be in conformity with the trace illustrated in the Figure. 3.2 Rate of pressure rise 3.2.1 Definitions 3.2.1.1 rate of pressure rise the slope of the pressure/time curve in the straight portion of the pressure increase portion for the purpose of definition, the rate of rise shall be determined bet
16、ween 10 % of the total rise above back-pressure and 10 % of the total rise below peak pressure 1) At present at the stage of draft. Figure Impulse trace Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 2 BSI 01-2000 3.2.1.2 peak
17、 pressure the maximum pressure reached during the test pressure surge to 125 % or 150 % of the specified nominal pressure, as appropriate 3.2.2 Calculation The rate of pressure rise shall be calculated using the following formula: where pis the peak pressure, in kilopascals; t0,9 pis the time, in se
18、conds, at 0,9 p; t0,1 pis the time, in seconds, at 0,1 p. Sweep rate on the oscilloscope or recorder shall be adjusted so that the slope of the pressure rise shall take advantage of the full size of the screen. The trace and photographs of the impulse cycle shall be an accurate record of the impulse
19、 cycle and show a grid or other means to permit accurate checking. 3.3 Preparation of specimens The preparation of test specimens shall be defined in the detail design specification of the component. Specimens shall be subjected to the relevant treatments and production test requirements of the comp
20、onent specification. 3.4 Test fluid The test fluid shall be the specified aircraft system fluid or other hydraulic fluid which is compatible with the item being tested. 4 Principle of test This method of testing is intended to determine the ability of flexible hose assemblies, tubing and fitting ass
21、emblies to with-stand hydraulic impulse for qualification testing under simulated conditions. 5 Test method For testing of hose, tubing and fitting assemblies, including boss or port fittings, the cycle rate shall be 70 5 cycles/min. Unless otherwise specified, the peak pressure and the rate of pres
22、sure rise shall be as specified in Table 1. Unless otherwise specified, the assembly shall be tested in the sequence shown in Table 2. Unless otherwise specified in the detail or procurement specification, the total number of cycles shall be 200 000. After the temperature has stabilized at the maxim
23、um or minimum, as specified in Table 2, a minimum soak time of 1 h is required before that portion of the test sequence is begun. If temperature control is required by the procurement specification, the fluid temperature shall be measured at the test manifold and the ambient temperature shall be mea
24、sured approximately 150 mm from the test specimens. The peak pressure shall be measured at the test manifold. Table 1 Peak pressure and rate of pressure rise Hoses, tubing and fitting assembliesPeak pressureMaximum rate of pressure rise Pressure classaNominal outside diameterb%kPa/s (bar/s) B 10 500
25、 kPa (105 bar) DN14 and smaller 125 700 000 (7 000) DN16 to DN25 (incl.)520 000 (5 200) DN32340 000 (3 400) DN40 and over280 000 (2 800) D 21 000 kPa (210 bar) All diameters1502 100 000 (21 000) E 28 000 kPa (280 bar) a Pressure classes in accordance with ISO 6771. b Nominal outside diameters in acc
26、ordance with ISO 8575. DN = nominal outside diameter; example: DN16 = nominal outside diameter of 16 mm Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 BSI 01-20003 Table 2 Sequence and duration of impulse testing at temperatur
27、ea 6 Intended use 6.1 Standard This test is intended to promote standardization of impulse test requirements, procedures and equipment for the standard qualification and evaluation impulse testing of hydraulic hose assemblies, tubing and fittings. 6.2 Reference If reference is made to this Internati
28、onal Standard in a specification as part of the requirements, the following additional requirements shall be specified: a) nominal pressure; b) operating temperature limits; c) design of specimens. Sequence No. Number of cycles as a percentage of the total number of cycles Temperature (ambient and f
29、luid) 150Maximum 224Room 31Minimum 45Maximum 520 To complete 200 000 cycles; these cycles may be added to any one sequence or divided among them a Unless otherwise specified in the detail or procurement specification. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Un
30、controlled Copy, (c) BSI 4 blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2M 52:1989 BSI 01-2000 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:15:19 GMT+00:00 2006, Uncont
31、rolled Copy, (c) BSI BS 2M 52:1989 ISO 6772:1988 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorpora
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