ISO 22433:2018

Overview

ISO 22433:2018 defines the geometric configuration for the dynamic beam seal end used with pipe couplings 8°30′ in aerospace fluid systems. The standard applies to elbows, tees and crosses for nominal pressures up to 28 000 kPa, specifying the required dimensions and surface characteristics required for reliable dynamic beam seal interfaces in aerospace piping.

Key Topics

• Scope and applicability
  • Dimensions for dynamic beam seal ends of elbows, tees and crosses for aerospace pipe coupling 8°30′ (up to 28 000 kPa).
• Dimensional requirements
  • Geometry is given by referenced Figure 1 and Table 1; the standard provides dimension codes tied to nominal pipe outside diameter.
  • Where dimensions are not specified, manufacturers may select alternatives provided they meet qualification/acceptance per EN 3275 (type II).
• Surface finish
  • Surface roughness requirements are defined according to the referenced figure unless overridden by design documentation.
• Designation
  • A standardized designation format is shown (example: ISO22433 05, where the code refers to Table 1).
• Normative references
  • The standard references related documents: EN 3274 (thread end geometry) and EN 3275 (dynamic beam seal technical specification, metric series).

Applications

ISO 22433:2018 is intended for stakeholders involved in design, manufacture, testing and procurement of aerospace fluid system components:

• Aerospace component designers and engineers specifying pipe coupling 8°30′ geometries for elbows, tees and crosses.
• Manufacturers producing dynamic beam seal ends and mating components to ensure interchangeability and pressure capability up to 28 000 kPa.
• Quality, test and certification teams verifying compliance to dimensional and surface requirements.
• Procurement and maintenance teams ensuring replacement parts match required geometric configurations.

Practical benefits include improved interchangeability, predictable sealing performance, and simplified qualification for high-pressure aerospace piping systems.

Related Standards

• EN 3274 - Aerospace series: Pipe coupling 8°30′ - Thread end - Geometric configuration.
• EN 3275 - Aerospace series: Pipe coupling 8°30′ up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification.
• Developed under ISO/TC 20 (Aircraft and space vehicles), SC 10 (Aerospace fluid systems and components); historically prepared by ASD‑STAN as EN 3273:2001.

Keywords: ISO 22433:2018, aerospace pipe coupling, dynamic beam seal, 8°30′, geometric configuration, elbows tees crosses, nominal pressure 28 000 kPa, EN 3274, EN 3275.