1、CEN PREN*3788 94 3404589 0064485 b05 Edition approved for publication 1994-06-30 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE C4 Chairman M
2、r. Staib prEN 3788 Edition P 1 June 1994 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : Descriptors : Srie arospatiale Raccordement 8O30 Capuchons de protection ENGLIS
3、H VERSION Aerospace series Pipe coupling 8O30 Protective caps Luft- und Raumfahrt Rohrverschraubung 8O30 Schutzkappen This “Aerospace Series Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper
4、 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 extent that interchangeability is affec
5、ted, 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 European Standard to CEN (European Committee f
6、or Standardization) for formal vote. Nota Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Page 2 prEN 3188 CEN PREN+3788 94 3404589 0064486 541 (B/HZLL/5.F/D/F/A/A) Contents list 1 Scope 2 Normative references 3 Required c
7、haracteristics 4 Designation 5 Marking CEN PRENx3788 94 3404589 0064487 488 W (B/HZLL/5.F/D/F/A/A) Page 3 prEN 3788 1 Scope This standard specifies the characteristics of protective caps used to protect metric tube ends during transportation and storage. The caps shall be pushed on/off the tube ends
8、. 2 Normative references IS0 2768-1 General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications EN 2424 Aerospace series - Marking of aerospace products l) EN 3275 Aerospace series - Pipe coupling 830 - Dynamic beam seal up to 28 000 kPa - Metri
9、c series - Technical specification 2) 1) Published as AECMA Standard at the date of publication of this standard 2) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 3788 CEN PREN*3 94 3404589 O064488 314 M (S/H2LL/5.F/D/F/A/A) 3 Required characteristics 3.1 The
10、configuration shall be in accordance with figure 1; the dimensions and tolerances shall conform to the vaiues shown in figure 1 and table 1. Dimensions and tolerances not quoted are at the manufacturers option, subject to meeting the qualification and acceptance values of EN 3275. Configuration - Di
11、mensions - Tolerances 3.2 Characteristics The plastic material and tolerances used shall prevent any material shearing off when the cap is pushed on/of f. The caps are a throw-away item after any use. Each cap shall be stored in a clear plastic bag prior to use and be without any visible contaminati
12、on. Internal surfaces and end surface shall be free from burrs. The caps shall be firmly attached to the tube, but be able to be removed by finger force. CEN PREN*3788 94 = 3404589 0064489 250 W DN ) 05 06 08 10 12 14 3.3 Material Polyethylene, grade I, virgin (LDPE) Colour: white A B C 5 22 0,8 6 2
13、2 Oe8 8 22 0,8 10 22 0.8 12 22 1 ,o 14 22 1 .o “i Page 5 prEN 3788 Figure 1: Configuration Table 1 : Dimensions, tolerances Dimensions in millimetres r I I 1 1 16 16 22 1 #O 18 18 22 1 ,o 20 20 22 1 #O 22 22 22 1 .o 25 25 22 1 ,o 28 28 22 1 ,o 32 32 22 1 ,o I I I I 1,o I 1) DN Diameter Nominal (outs
14、ide diameter of the corresponding pipe) 2) Parts are supplied with a molding ring for extra gripping power. Page 6 prEN 3188 Description block PROTECTIVE CAP CEN PREN*3788 94 3404589 00b4490 T72 (B/H2LL/5.F/D/F/A/A) Identity block EN3788-08 prEN 3788 5 Marking Each part shall be marked in the position shown in figure 1 in accordance with EN 2424, style A.
