1、STD-AECMA PREN 4054-ENGL 1998 = 1022333 0035473 22Li M AECMA STANDARD NORME AECMA AECMA NORM prEN 4054 Edition P 1 December 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.080 Descri
2、ptors: ENGLISH VERSION Aerospace series Pipe couplings, loose flanges and seals Seals in fluorocarbon rubber and armature in aluminium alloy Technical specification Srie arospatiale Raccords, brides amovibles et joints Joints en lastomre fluorocarbone et armature en alliage daluminium Spcification t
3、echnique Luft- und Raumfahrt Rohrverbindungen mit losen Flanschen und Flachdichtung Dichtung aus Fluorcarbon-Elastomer mit Aluminiumarmierung Technische Lieferbedingungen This Merospace Series” Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Ind
4、ustries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an
5、 extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft Europe
6、an Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX Edition approved for publication I Comments should be sent within six months after the date
7、 of DUbliCatiOn to 1998-1 2-31 AECMA Gulledelle 94 8-1200 BRUXELLES C8 Chairman Mr Feltham aecma 1998 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-e
8、 STD-AECMA PREN iOSi-ENGL 1498 LOL23LL 0015494 Lb0 Page 2 prEN 4054: 1998 Contents list 1 Scope 2 Normative references 3 Definitions 4 Quality assurance 5 Technical requirements and inspection and test methods 6 Packaging 7 Marking 8 Storage Annex A (normative): Inspection of appearance after mouldi
9、ng the rubber part onto the metallic part Annex B (normative): Inspection after assembly Annex C (normative): Ageing and pressurizing tests Annex D (normative): Resistance to fluids Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot
10、for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 4054-ENGL 1798 H 30323IL 0035475 UT7 Page 3 prEN 4054: 1998 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for seals for flanged pipe couplings in fluorocarbo
11、n rubber with an armature in aluminium alloy. It is applicable whenever referenced. 2 Normative references IS0 1817 Rubber, vulcanized - Determination of the effect of liquids IS0 2859-1 Sampling procedures and tables for inspection by attributes - Part 1: Sampling plans indexed by acceptable qualit
12、y level (AQL) for lot-by-lot inspection EN 2751 Aerospace series - Storage conditions for rubber products - Requirements for storage, cleaning and maintenance 1) EN 2798 Aerospace series - Fluorocarbon rubber (FPM) - Low compression set - Hardness 80 IRHD 2) EN 3042 Aerospace series - Quality assura
13、nce - EN aerospace products - Qualification procedure EN 3376 Aerospace series - Limits of surface imperfections of elastomeric toroidal sealing rings (O-rings) 2) 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 Production batch Quantity of finished seals manufa
14、ctured from the same batch of compound moulded onto the armature. The product standard of the material defining the armature shall be the same for the compound batch. 3.2 Compound A homogeneous mixture of polymers or polymers with all ingredients required for the finished product 1) In preparation a
15、t the date of publication of this standard 2) Published as AECMA Prestandard at the date of publication of this standard Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without lic
16、ense from IHS-,-,-prN 4054: 1998 4 Quality assurance 4.1 Qualification EN 3042 Qualification, inspections and tests shall be carried out on five seals of each size, except for opposed indication specified in table I. The test programme may possibly be reduced. Any such decision shall be based on the
17、 results obtained on similar types of seals provided that the design and manufacturing conditions are identical. 4.2 Acceptance The purpose of acceptance tests is to check, as simply as possible, by a method representative of actual use conditions that the seals constituting the production batch sat
18、isfy the requirements of this standard. 4.2.1 Conditions Acceptance tests are specified in table 1. They shall be carried out on each production batch. Table 1 specifies the test method and the sampling plan applicable to each test. Seals from the production batch to be tested shall be selected by s
19、imple random sampling. Each seal may be submitted to several tests. The seals to be subjected to destructive tests may be those on which nondestructive tests have been carried out. 4.2.2 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibi
20、lity. 4.2.3 Inspection and test report The manufacturer must ensure conformity of products according to the results obtained in relation to the requirements and carry out an inspections and test report giving the observed values. This report shall be provided to the purchaser. 5 See table 1. Technic
21、al requirements and inspection and test methods Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Marking l Storage I See Visual examination Magnificatio
22、n at a maximum of six times Q See4.1. A 100 % Visual examination A 100 % Page 5 prEN 4054: 1998 Table 1: Technical requirements and test methods Clause Characteristic Requirement 5.1 5.2 Materials (armature and rubber parts) Dimensions and tolerances In accordance with the product standard or defini
23、tion document In accordance with the product standard or definition document As stated in the material specification Table 2 Standard gauging at a temperature of 20 “C I 5 “C 5.3 Surface condition 5.3.1 Armature The armature shall be exempt of surface defects as: burrs, deep seams, cracks or other i
24、mperfections detrimental to good functioning. Special attention shall be made (before rubber moulding) to the area in contact with the rubber to obtain perfect rubber adhesion during moulding. Rubber parts In accordance with the inspection document EN 3376 5.3.2 - 5.3.3 5.4 100 % Finished product Se
25、e annex A. I 1 sampleof each diameter Moulding of the rubber part on the metallic part without any detrimental defect to good functioning Seating strength required to achieve a metal / metal contact See annex B. 1 sample of each diameter Assembly I A 1 Table3 I 5.5 Performance Resistance to ageing a
26、nd pressurizing See annex C. 1 sample of each diameter See annex D. 1 sample of each diameter i Swelling by oil and fuel 5.6 Packaging See 6. Visual examination I A I 100% I See 7. 5.7 5.8 Il Means adapted to the I requirement 1) Q = Qualification, A = Acceptance I Copyright Association Europeene de
27、s Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN LiOSq-ENGL 1798 D 1OL2333 0035498 Bob Page 6 prEN 4054: 1998 Production batch size 2 500 501 to 3200 3201 to 35000 2 35 O0
28、1 Table 2: Sampling plans for visual inspections and dimensional characteristics Sample sue Acceptance number Non-destructive tests Destructive tests (Ac) A B 8 3 O 13 5 O 20 5 O 32 8 O Production batch size I 15 16 to 25 26 to 50 51 to 90 91 to 150 151 to 280 281 to 500 501 to 1 200 1201 to 3200 32
29、01 to 10000 10001 to 35000 35001 to 150000 2 150 O01 Sample size 3 5 8 13 20 32 50 80 125 200 315 500 800 Acceptance number (Ac) and limiting quality (LQ) in accordance with the acceptable quality level (AQL) AQL 0,065 % Ac J- .1 J- J- J J J- .1 J J- t 1 ? Use sampling plan above. Use sampling plan
30、below. NOTE: The data given in this table are based on single sampling plans for a normal inspection, as specified in IS0 2859-1 (tables Il-A and VI-A). A 100 % inspection should be performed when the sample size is as large as or larger than the batch size. Other sampling plans specified in IS0 285
31、9-1 may be used (double or multiple sampling), but these shall be chosen in such a way as to ensure an equivalent quality level. Table 3: Sampling plans for the inspection of physical characteristics Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under lice
32、nse with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN VOSLI-ENGL 1998 W LO12311 0015Li 742 W Page 7 prEN 4054: 1998 6 Packaging 6.1 Ge ne ral Packaging is intended to protect seals during storage. Seals shall be packed individually in waterti
33、ght, opaque cases and shall be water vapour-, ozone-, oil- and greaseproof. This packaging shall be resistant enough to prevent the seals against any damage occurring in the course of handling and transportation. 6.2 Individual package 6.2.1 Material The following materials shall be used: - opaque p
34、olyethylene coated kraft paper; - laminate consisting of aluminium, paper and polyethylene; - opaque polyethylene film. The use of polyvinyl chloride film (PVC film) is not permissible. Transparent or translucent materials shall not be used. 6.2.2 Dimensions Depending on the size of the seals, use a
35、 large enough individual package without this, however, being larger than necessary. 6.3 Collective packaging Items, in their individual package, may be combined in collective packages. This package shall: - be resistant enough so that the items: - cannot be damaged in the course of handling or tran
36、sportation, - be protected against any damage due to exposure to environmental effects or any other normal hazard; - bear a label legible from outside; - contain seals with the same definition. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license wi
37、th AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 8 prEN 4054: 1998 7 Marking 7.1 Individual package Each individual packet shall be legibly marked with not less than the following information: - manufacturers identification; - identity according to the
38、product standard; - batch number; - quarter and year of vulcanization of the rubber part in bilingual (e.g. 3Q93 / 3T93); - UNLIMITED SHELF LIFE / SANS LIMITATION DE VIE; - mark (manufacturers monogram) or inspection stamp guaranteeing the products quality (packaging included); 7.2 Collective packag
39、ing The following information shall be marked on the collective packaging: - manufacturers identification; - identity according to the product standard; - order number; - quantity. 8 Storage See EN 2751. The duration of storage is unlimited for these items. Copyright Association Europeene des Constr
40、ucteurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- STD-AECMA PREN 4054-ENGL 1998 0 LOL23Ll 0015501 120 I Page 9 prEN 4054: 1998 Annex A (normative) Inspection of appearance after moulding the rub
41、ber part onto the metallic part Cut out the item along a diametral plan and verify that the fastening of the rubber pari on the metallic part is satisfactory. Annex B ( n o r m a t ive) Inspection after assembly Record the seating strength required to achieve a metal / metal contact. The torque to b
42、e applied to achieve a metal / metal contact shall be compatible with a bolt and a standard seating torque for the seal assembly in the use condition. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or ne
43、tworking permitted without license from IHS-,-,-Page 10 prEN 4054: 1998 Annex C (normative) Ageing and pressurizing tests The ageing tests shall be carried out at 150 OC at atmospheric pressure and coupled with pressurizing at ambient temperature (e 20 OC). C.l Conditions The tested seals shall be p
44、ut in assemblies representative of the flanged condition. The assemblies shall be put in a heated air oven at 150 OC, then removed from the oven after ageing for one day, two days, four days, eight days then every eight days until they leak or until pressure falls. The assemblies (not dismantled) sh
45、all be submitted to a pressurizing test with air at ambient temperature between each time. The pressurizing test shall follow the procedure hereafter: 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 o. assemble the bleed coupling; screw on the pipe for the hydraulic system; put the system under pressure; bleed the sys
46、tem; repeat operations 3 and 4; connect the system to the pressure measurer; calibrate the measurer; connect the measurer to the recorder; program the recorder; test the assembly under pressures of 1 MPa, 2 MPa, 4 MPa, 6 MPa, 8 MPa, 10 MPa, 12 MPa, 14 MPa and 15 MPa with a stage of five minutes per
47、pressure level. The ageing and pressurizing tests are considered finished if a leak or a fall in pressure is observed. The requirement is holding a minimum pressure of 10 MPa after 48 days of ageing, these 48 days of ageing being an accumulation of heating times as previously described. After tests
48、and removal of the seal, carry out a visual examination of the assembly. Use a lotimes magnification for the rubber part. The possible damage observed shall be such that the functioning of the seal shall be guaranteed. Specify the values obtained in the inspection and test report. Copyright Associat
49、ion Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- STD-AECMA PREN 4054-ENGL 1978 W 1012311 0035503 TT3 Page 11 prEN 4054: 1998 Annex D (normative) Resistance to fluids Put the seal in a Set-up representative to the
