ISO 10466:2021

Overview

ISO 10466:2021 specifies a standardized test method for proving the resistance of glass‑reinforced thermosetting plastics (GRP) pipes to initial ring deflection. The method determines whether GRP pipe rings can withstand specified levels of diametral (ring) compression without surface damage or structural failure. This second edition updates and replaces ISO 10466:1997 and is intended for use where a referring standard sets the deflection limits, test-piece dimensions, test temperature and acceptance criteria.

Key Topics and Requirements

• Scope: Assessment of resistance to initial vertical (ring) deflection for GRP pipes - visual and strength‑reduction criteria for failure are defined.
• Test principle: A horizontal pipe ring is compressed diametrically to two successive specified deflection levels; inspections for surface damage and structural failure occur at each level.
• Apparatus: Requires a compressive‑loading machine and defined load‑application surfaces (plates or beam bars). Beam bars are required when relative deflection limits exceed 28%.
• Measurement & instruments:
  • Calibrated dimension‑measuring devices (length, diameter, wall thickness) with stated accuracy.
  • Instruments to measure the vertical change in diameter to specified tolerances.
  • Temperature measuring equipment where test temperature is specified.
• Test pieces & preparation: Complete pipe rings with specified length, smooth perpendicular ends and six reference lines at 60° intervals; wall thickness and mean diameter determined per ISO 3126 methods.
• Procedure:
  • Condition test pieces to test temperature.
  • Compress to the first deflection target over a controlled time, hold while visually inspecting for surface damage, then increase to the second target and monitor for structural failure and load drops.
  • Failure criteria include visual signs (interlaminar separation, fiber breakage, buckling, liner separation) and defined strength‑reduction behavior (instantaneous load drops).
• Reporting: Record deflection, applied loads, observations of damage or failure, test temperature and equipment used.

Applications

ISO 10466:2021 is practical for:

• GRP pipe manufacturers for product development, quality control and specification compliance.
• Independent test laboratories performing acceptance and type-testing.
• Pipeline designers, utilities and procurement teams specifying GRP pipe performance.
• Certification bodies and standards committees assessing structural integrity under compressive ring deflection.

Keywords: ISO 10466:2021, GRP pipes, glass‑reinforced thermosetting plastics, ring deflection test, compressive‑loading machine, pipe testing, structural failure criteria.

Related Standards

• ISO 3126 - referenced for methods to measure dimensions (wall thickness, diameters).
• Standards and specifications that reference ISO 10466 typically define the actual deflection limits, test temperature and number/length of test pieces.