1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 4816 Edition P 1 December 2015 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.org ICS: Descriptors: ENGLISH VERSION
2、Aerospace series Flange couplings Gasket seal with nickel alloy C seal Technical specification Inch series Luft- und Raumfahrt Rohrverschraubung mit Flanschen Flachdichtung aus Nickellegierung mit Armierung Technische Lieferbedingung Inch-Reihe Srie arospatiale Raccordement bride Joint plaque avec j
3、oint C en alliage de nickel Spcification technique Srie en inches This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industr
4、y. It has been technically approved by the experts of the concerned Domain following member comments. 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
5、of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to i
6、mplement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 1st December 2015 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Do
7、main Copyright 2015 by ASD-STAN prEN 4816:2015 (E) 2 Contents Page Foreword .2 1 Scope .3 2 Normative references .3 3 Terms and definitions 4 4 Requirements, inspection and test methods .6 5 Quality assurance .9 6 Preparation for delivery 10 7 Storage 11 Annex A (normative) Test assembly for ageing
8、and pressure testing . 12 Annex B (normative) Inspection during assembly . 13 Annex C (normative) Ageing and pressurizing tests . 14 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the ru
9、les of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 4816:2015 (E) 3 1 Scope This standard specifies the required characteristics, inspection and test methods, quality assurance and procurement requirements for inch series, gasket sea
10、l with C seal in nickel alloy, for temperature ranges from type II to type V according to ISO 6771 and nominal pressure up to 10 500 kPa (class B according to ISO 6771). In addition to the requirements of this technical specification, the coupling assemblies shall be qualified in accordance with equ
11、ipment or component specification requirements. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition
12、 of the referenced document (including any amendments) applies. EN 2951, Aerospace series Metallic materials Test method Micrographic determination of content of non-metallic inclusions 1) EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts EN 10
13、204, Metallic products Types of inspection documents ISO 468:1982, Surface roughness Parameters, their values and general rules for specifying requirements ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot i
14、nspection ISO 6771, Aerospace Fluid systems and components Pressure and temperature classifications ISO 8625-1, Aerospace Fluid systems Vocabulary Part 1: General terms and definitions related to pressure TR 2674, Aerospace series Design and construction of pipeline for fluids in liquid or gaseous c
15、ondition Rigid lines, installation 2) TR 4815, Aerospace series Flange couplings, up to 21 000 kPa Design standard Inch series 2) MIL-PRF-23699, Lubricating oil, aircraft turbine engine, synthetic base, NATO code number O-156 3) 1) Published as ASD-STAN Prestandard at the date of publication of this
16、 standard. (http:/www.asd-stan.org/) 2) Published as ASD-STAN Technical Report at the date of publication of this standard. (http:/www.asd-stan.org/) 3) Published by: DoD National (US) Mil. Department of Defense. (http:/www.defenselink.mil/) prEN 4816:2015 (E) 4 3 Terms and definitions For the purpo
17、ses of this document, the following terms and definitions apply. 3.1 Pressure Nominal pressure, proof pressure, impulse pressure, burst pressure according to ISO 8625-1. Maximum operating pressure depends on the seal use in the assembly. 3.2 Coupling and assembling 3.2.1 coupling assembly assembled
18、ferrule, loose flange, bolts and pipe mating with e.g. equipment (see Figure 1) Key 1 Bolts 2 Swivel flange 3 Tube 4 Coupling 5 Seal 6 Port connection on case or equipment Figure 1 Example of coupling assembly prEN 4816:2015 (E) 5 3.2.2 dimensional code is composed with the nominal diameter given in
19、 16th of inches within 2 digit and additional digit when necessary to describe the size of a fluid system component and other configuration options 3.3 Surface defects 3.3.1 surface irregularity nonconformity with general surface appearance, possible defect 3.3.2 crack clean (crystalline) fracture p
20、assing through or across the grain boundaries that possibly follows inclusions of foreign elements Note 1 to entry: Cracks are normally caused by overstressing the metal during forging or other forming operations, or during heat treatment. Note 2 to entry: Where parts are subject to significant rehe
21、ating, cracks are usually discoloured by scale. 3.3.3 fold doubling over of metal, which can occur during the forging operation. Folds can occur at or near the intersection of diameter changes and are especially prevalent with non-circular necks, shoulders and heads 3.3.4 lap fold-like machining def
22、ect 3.3.5 seam (1) Usually a surface opening or crack resulting from a defect obtained during casting or forging. (2) Extraneous material, stringer in the material, which is not homogeneous with base metal. 3.3.6 pit void or hole in the surface as caused, for example, by corrosion 3.4 Quality assura
23、nce 3.4.1 production batch a definite quantity of some commodity or service produced at one time under conditions that are presumed uniform 3.4.2 delivery batch batch consisting of couplings with the same identity block which may come from different production batches 3.4.3 Acceptable Quality Level
24、AQL when a continuing series of lots is considered, a quality level which for the purposes of sampling inspection is the limit of a satisfactory process average prEN 4816:2015 (E) 6 3.4.4 qualification testing required to demonstrate successful performance of the coupling assembly in simulated servi
25、ce (overload, destructive and fatigue tests) 3.4.5 major defect a defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 3.4.6 minor defect a defect that is not likely to reduce materially the usabili
26、ty of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product 4 Requirements, inspection and test methods See Table 1. The couplings shown on Figure 1 of this standard are for infor
27、mation only. The test specimens shall be assembled with the part to test (e.g. elbow fitting instead of straight fitting) and its associated components in accordance with TR 4815. 4.1 Test conditions and preparation of specimens for qualification 4.1.1 Tests fluids Unless otherwise specified, tests
28、shall be carried out using e.g. oil compatible with the test temperature range. Water may be used, whenever practical, for pressure testing. 4.1.2 Pipe junction The method of joining the pipe to the coupling (brazing, welding, mechanical attachment, etc.) shall not be detrimental to the properties,
29、strength or geometry of the pipe assembly. The joint shall be in accordance with the design instructions and shall be inspected by direct measurement, X-ray or other non-destructive methods. 4.1.3 Assembling Installations of the coupling shall be in accordance with TR 2674 and TR 4815. The coupling
30、shall be fitted with nickel alloy double hexagonal head bolt with the relevant bolt size. Unless otherwise specified, the bolt shall be lubricated if necessary prior the assembling with engine oil (e.g. according to MIL-PRF-23699) on the thread and at the interface between the nut and the ferrule. E
31、ither bolt or mating threaded part shall have coated on thread. A torque value comprised between the minimum and the maximum given in Table 2 plus locking torque value shall be apply to each bolt without any special sequence in the torque tightening. 4.1.4 Pressurizing Nominal pressure (PN); Proof p
32、ressure (PE) and Burst pressure (PR) are given in Table 3 for current tube material and thickness able to withand minimum burst pressure required for such pipe assembly. prEN 4816:2015 (E) 7 For other tube material and thickness the Burst pressure (PR) shall be determined with the formula: D eRRP 2m
33、= PEPNPR = = 24 where Rm Material minimal strength resistance of the tube; e Thickness of the tube; D Nominal diameter of the tube. 4.1.5 Ageing Gasket shall be assembled on test specimen as given in Annex A or equivalent. 4.1.6 Pressurizing Nominal pressure (PN) is given in the design standard; Pro
34、of pressure (PE) is the double of Nominal pressure (PN) value. Burst pressure (PR) is four (4) times the Nominal pressure (PN) value. Table 1 Requirements, inspection and test methods (1 of 2) Clause Characteristic Requirement Inspection and test method Q a A a 4.2 b Materials Metallic materials sha
35、ll meet the acceptance criteria given in EN 2951. Conformity with the product standards. Metallic materials shall be tested in accordance with EN 2951. Certificate of compliance to EN 10204 issued by the semi-finished product manufacturer. X 100 % X 100 % 4.3 b Dimensions Conformity with the product
36、 standards Suitable measuring instruments X 100 % X 20 % 4.4 b Product identification Marking according to product standards. It shall be legible and shall not adversely affect the material or the functioning of the products. Visual examination X 100 % X 100 % 4.5 b Surface roughness Conformity with
37、 the product standards. Interpreted in accordance with ISO 468. Suitable measuring instruments or visual-tactile samples X 100 % X 20 % 4.6 b Surface coating or plating or treatment Conformity with the product standards Visual examination X 100 % X 50 % 4.7 b Surface defects Parts shall be free from
38、 surface defects indicated in 3.3 liable to have an adverse affect on their characteristics and endurance. Visual inspection using suitable methods prior to surface coating or plating or treatment X 100 % X 100 % prEN 4816:2015 (E) 8 Table 1 Requirements, inspection and test methods (2 of 2) Clause
39、Characteristic Requirement Inspection and test method Q a A a 4.8 Proof pressure test The coupling assembly shall withstand and shall not show any evidence of permanent deformation or other malfunction that would affect assembly or disassembly without any relative pressure when using the specified t
40、orque values. The coupling assembly shall be connected to a pressure source at a pressure equal to twice the nominal pressure for at least 5 min at ambient temperature with one end free to move. X 100 % X 4.9 Burst pressure test The coupling assembly shall withstand this test without leakage. Pipe e
41、xpansion is permissible. The coupling assemblies need not meet any disassembly or assemblies requirements after this test. The coupling assembly shall be connected to a pressure source at a pressure equal to four times the nominal pressure for at least 5 min, when tested at ambient temperature with
42、one end free to move. X 100 % a Q: Qualification, A: Acceptance. b Applicable to parts prior to assembly. Table 2 Torque values for bolts Nominal diameter Torque Nm inch mm min. max. .1900 4,826 1,5 1,6 .2500 6,350 2,9 3,3 .3125 7,938 8,4 9,4 Table 3 Pressure values for 0,889 mm wall thickness tubes
43、 in NI-PH2601 Dimensional code number a Nominal diameter ISO 6771 pressure class Nominal pressure Proof pressure Burst pressure inch mm kPa kPa kPa 10 .625 15,875 B 10 500 21 000 42 000 12 .750 19,050 B 10 500 21 000 42 000 16 1.000 25,400 B 10 500 21 000 42 000 20 1.250 31,750 B 10 500 21 000 42 00
44、0 24 1.500 38,100 9 000 18 000 36 000 28 1.750 44,450 7 500 15 000 30 000 32 2.000 50,800 6 500 13 000 26 000 a This code number just corresponds to the nominal diameter given in 16th of inches within 2 digit. prEN 4816:2015 (E) 9 5 Quality assurance 5.1 Product qualification The manufacturer shall
45、obtain qualification in accordance with this standard and EN 9133. Qualification, inspections and tests shall be carried out on five (5) samples of each part number. The test programme may possibly be reduced. Any such decision shall be based on the results obtained on similar types of couplings pro
46、vided that the design and manufacturing conditions are identical. 5.2 Quality control records The manufacturer shall maintain a record of inspection applied to each production batch for a minimum of five (5) years. Records of chemical composition analysis, mechanical property tests showing conforman
47、ce with the applicable material specification and metallurgical tests shall be made available to the purchaser (user) of each delivery batch of coupling parts upon request. Each delivery batch shall be traceable to its production batch. 5.3 Acceptance conditions The acceptance of a delivery batch sh
48、all be in accordance with 4.1 to 4.8. Non-destructive tests for inspection of threads, finish, dimensions, marking, surface defects shall be conducted on a sampling basis in accordance with ISO 2859-1. Classification of defects Defects are classified in Table 4 according to the effect they have on s
49、afety and usability. Definition of classes shall be in accordance with ISO 2859-1. Level of inspection The following acceptable quality levels (AQL) shall apply to the defect classifications shown in Table 4. Failure class Major: AQL 1,5 Failure class Minor: AQL 4,0 All defects not identified in Table 4 shall be inspected in accordance with the “minor defect“ classification, AQL 4,0. prEN 4816:2015 (E) 10 Table 4 Classification of
