BS 4806:2017 pdf download – Aerospace series – Flange couplings – Weld coupling, straight, in nickel alloy – Inch series
1 Scope
This European Standard specifies the characteristics of straight welded coupling in nickel alloy for swivel flange couplings for inch series aerospace applications.
Nominal pressure: The parts shall withstand nominal pressures given in Table 1. The nominal pressure of the assembly depends on associated seal, tube material characteristics, tube diameter and tube wall thickness (see EN 4814).
NOTE Assembly in accordance with TR 4815.
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 of the referenced document (including any amendments) applies.
EN 2424, Aerospace series — Marking of aerospace products
EN 2516, Aerospace series — Passivation of corrosion resisting steels and decontamination of nickel base alloys
EN 3671, Aerospace series — Heat resisting alloy NI-PH3601 (NiCr22Mo9Nb) — Non heat treated — Forging stock — a or D ≤ 250 mm
EN 4379, Aerospace series — Heat resisting alloy NI-PH3601 (NiCr22Mo9Nb) — Solution treated, forging D e ≤ 200 mm
EN 4380, Aerospace series — Heat resisting alloy NI-PH3601 (NiCr22Mo9Nb) — Solution treated — Bar and section — D e ≤ 200 mm 1)
EN 4814, Aerospace series — Flange couplings up to 21 000 kPa — Technical specification — Inch series
EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defense Organizations
TR 4815, Aerospace series — Flange couplings up to 21 000 kPa — Design standard — Inch series 2)
3 Required characteristics
3.1 Configuration – Dimensions – Tolerances – Masses
See Figure 1 and Table 1. Dimensions and tolerances are in millimetres, except otherwise specified.
3.2 Material and surface treatment
EN 4380 or EN 3671 or EN 4379.
Surface finish: Passivation EN 2516.
5 Identification marking
EN 2424, category A, as indicated on Figure 1.
6 Technical specification
See EN 4814.
7 Quality Assurance
Approval of the manufactures.
See EN 9100.