1、 STD-AECMA PREN 3077-ENGL 1998 m 1012311 0014858 9bb m Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to C4 Chairman prEN 3077 Edition P 1 September 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE
2、 INDUSTRIES (AECMA) Guiledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: Descriptors: Srie arospatiale Colliers vis tangente Spcification technique ENGLISH VERSION Aerospace series Clamps worm drive Technical specification Luft- und Raumfahrt Schellen mit Schnecken
3、trieb Technische Lieferbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concern
4、ed Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination a
5、nd signature of the AECMA Standard Checking Centre INPSI and format agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. 1998-09-30 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Staib a
6、ecma 1998 STDOAECMA PREN 3077-ENGL 1998 LO12311 0034859 8T2 Page 3 prEN 3077 1 Scope This standard specifies the required characteristics, inspections, test methods, quality assurance, qualification, acceptance and delivery conditions of clamps worm drive designed for use with suitable rubber hoses
7、to form joints in fluid system pipelines. The clamps worm drive are intended to be used as specified in the product standards. 2 Normative references This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate
8、places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incoporated in it by amendment or revision. For undated references the latest edition of the publication referred to
9、 applies. IS0 2859-1 Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection EN 2000 Aerospace series - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers EN 3042 Aerospace
10、 series - Quality assurance - EN aerospace products - Qualification procedure EN 10204 Metallic products - Types of inspection documents Previous page is blank HZLZ (Y/G.FNPI/M/F/D) STD=AECMA PREN 3077-ENGL 1998 m 10123Ll 00148b0 514 Page 4 prEN 3077 3 Definitions 4 For the purposes of this standard
11、, the following definitions apply: Clause Characteristic 3.1 Clamp worm drive: is a band of material fitted with an adjustment device intended for use in conjunction with a suitable hose to provide a pipe-to-pipe joint. Requirement 3.2 Batch: It shall consist of clamps of a particular size and mater
12、ial produced under essentially the same manufacturing conditions and presented for inspection at the same time. Inspection and test method The acceptance test cerrifi- cate for the semi-finished product may be used. They shall be measured using suitable instruments Visual examination Visual examinat
13、ion The maximum and minimum values of the tightening range shall be checked by dimen- sional inspection. The maxi- mum value shall be checked by mounting the clamp on a mandrel and the band screw engaged while the clamp is opened and the closing pro- cess initiated. The clamps shall be mounted on a
14、mandrel of nominal dia- meter and tightened to the torque values specified. There shall be no deformation of screw threads or band slots. The test shall be re- peated on mandrels of maxi- mum and minimum diameter. The clamps may be lubricated or dry. 4 Requirements, inspection and test methods See t
15、able 1. Q A ) 1 xx x x xx xx x x x Table 1 4.1 4.2 4.3 Materials Dimensions and tolerances Marking 4.5 They shall conform with the requirements of the product standards. Tightening range They shall conform with the values quoted in the product standards. The clamps shall be marked to the requirement
16、s of the product standards. It shall be legible and shall not degrade the material or adversely affect the Dart. Te appearance The clamps shall be free from burrs, sharp edges, irregular surfaces on the clamp band and any other defect which could affect their service use. The clamps shall be designe
17、d to operate within the full tightening range specified in the product standards. When the clamp is fully opened it shall be possible to reengage the band screw easily so that it passes into the closing range without any noticeable resistance. The clamps shall be capable of being tightened to the va
18、lues specified in the pro- duct standards. They shall apply over the full tightening range. (continued) H2U (YIG.FIVNIMIFID1) Table 1 (concluded) Requirement The clamps shall be capable of withstanding a torque of 1.5 times the value specified in the product standards. Repeated assembly shall not ca
19、use any change in clamp dimensions or affect the cor- rect functioning. The clamps shall be mounted on a mandrel of nominal dia- meter. The clamps shall then be tightened until failure oc- curs. The torque recorded shall be in excess of the values sDecified. To verify repeated assembly the clamps sh
20、all be installed five times on a maximum dia- meter mandrel. The clamps shall be opened by detaching the band from the screw and passing over the mandrel. On completion of the test the dimensions of the clamps shall be checked using suit- able instruments and inspected for defects likely to affect D
21、erformance. 1 Q : Qualification A : Acceptance Inspection and test method Page 5 prEN 3077 5 Quality assurance 5.1 Approval of manufacturer See EN 2000. 5.2 Product qualification See EN 3042. To obtain qualification for clamps the manufacturer shall observe the schedule and the requirements of table
22、 2. No change in material or design is permitted without the prior approval of the qualification authorities who granted the initial approval. 6 Acceptance conditions 6.1 Manufacturers responsibii The manufacturer is responsible for the tests to be performed at product acceptance. 6.2 Inspections an
23、d tests The inspections and tests to be performed by the manufacturer for the acceptance of a batch of clamps shall be those listed in table 3. A random sample shall be selected from each batch in accordance with the procedures listed in IS0 2859-1. The inspection level and acceptance quality level
24、AQL shall be as specified in table 3. H2LZ (Yt6.FNNIMIFID) STD-AECMA PREN 3077-ENGL 1998 = 1012311 0034862 397 Inspection or test Defined in Materials 4.1 Dimensions and tolerances 4.2 Marking 4.3 Surface appearance 4.4 Tightening range 4.5 Reusability 4.8 Band width and thickness All other dimensio
25、ns Page 6 prEN 3077 IS0 2859-1 Inspection level 1 AQL At manufacturers option 1 ,O (major) 4.0 (minor) 4,O (minor) 4.0 (minor) 4,O (minor) 5 parts Table 2: Inspection and tests for qualification Table 3: Inspection and tests for acceptance 7 Packaging The clamps shall be packed so as not to be damag
26、ed during transit; individual packaging is preferred. They shall be protected against humidity, corrosion, dirt and any other harmful attacks. The packaging material in contact with the clamps shall provide this protection. The following shall appear on each individual package: - name of manufacture
27、r - quantity - identity block of the product standard - date of packaging - name of manufacturer - number of order or contract - quantity - description - identity block of the product standard - reference of manufacturer At least the following shall appear on collective packages for transport: 8 Certificate of conformity -. All deliveries of clamps referring to this standard shall be accompanied by an acceptance test certificate in accordance with EN 10204, type 2.1 . H2U (Y/G.FNNIMIF/DI)
