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 e 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
8、test methods 6 Packaging 7 Marking 8 Storage Annex A (normative): Inspection of appearance after moulding 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 STD-AECMA PREN
9、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 fluorocarbon rubber with an armature in aluminium alloy. It is applicable whenever referenced. 2 Normativ
10、e 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 quality level (AQL) for lot-by-lot inspection EN 2751 Aerospace series - Storage conditions for rubb
11、er 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 assurance - EN aerospace products - Qualification procedure EN 3376 Aerospace series - Limits of sur
12、face 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 manufactured from the same batch of compound moulded onto the armature. The product standard of the
13、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 at the date of publication of this standard 2) Published as AECMA Prestandard at the date of pu
14、blication of this standard 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 bas
15、ed on the 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
16、batch satisfy 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 sele
17、cted by simple 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 r
18、esponsibility. 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
19、. Technical requirements and inspection and test methods Marking l Storage I See Visual examination Magnification 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 M
20、aterials (armature and rubber parts) Dimensions and tolerances In accordance with the product standard or definition 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 c
21、ondition 5.3.1 Armature The armature shall be exempt of surface defects as: burrs, deep seams, cracks or other imperfections 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 mould
22、ing. Rubber parts In accordance with the inspection document EN 3376 5.3.2 - 5.3.3 5.4 100 % Finished product See 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 / met
23、al contact See annex B. 1 sample of each diameter Assembly I A 1 Table3 I 5.5 Performance Resistance to ageing and 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
24、 Il Means adapted to the I requirement 1) Q = Qualification, A = Acceptance I 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 O01 Table 2: Sampling plans for visual inspections and dimensional characteristics Samp
25、le 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 3201 to 10000 10001 to 35000 35001 to 150000 2 150 O01 Sample size 3 5 8 13 20 32 50 80
26、 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 below. NOTE: The data given in this table are based on single sampling plans for a no
27、rmal 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 2859-1 may be used (double or multiple sampling), but these shall be chosen in such a wa
28、y as to ensure an equivalent quality level. Table 3: Sampling plans for the inspection of physical characteristics 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 indiv
29、idually in watertight, 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 b
30、e used: - opaque polyethylene 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 o
31、f the seals, use a 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 o
32、f handling or transportation, - 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. Page 8 prEN 4054: 1998 7 Marking 7.1 Individual package Each individual packet shall be
33、legibly marked with not less than the following information: - manufacturers identification; - identity according to the 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 (
34、manufacturers monogram) or inspection stamp guaranteeing the products quality (packaging included); 7.2 Collective packaging The following information shall be marked on the collective packaging: - manufacturers identification; - identity according to the product standard; - order number; - quantity
35、. 8 Storage See EN 2751. The duration of storage is unlimited for these items. 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 rubber part onto the metallic part Cut out the item along a diametral plan and v
36、erify 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 be applied to achieve a metal / metal contact shall be compatible with a bolt
37、and a standard seating torque for the seal assembly in the use condition. 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 T
38、he tested seals shall be put 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 asse
39、mblies (not dismantled) shall 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 und
40、er pressure; bleed the system; 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
41、stage of five minutes per 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 previous
42、ly described. After tests 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
43、report. 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 flanged condition. Carry out the test as defined in IS0 1817 or EN 2798 for the oil (liquid 101) and fuel (liquid B) exposure co
44、nditions. To ensure the seal is not bent: - remove the seal; - leave the rubber parts to rest from 1 h to 1 h 15 min; - record distortion values. These values are to be analysed to: - compare with the volume variation values authorized by EN 2798; - determine the creep values when creep is observed. Carry out a visual examination on the armature in contact with the rubber parts to look for any possible looseness.
