SIST EN 802:1997

Overview

SIST EN 802:1997 is a European standard developed by CEN, titled Plastics piping and ducting systems - Injection-moulded thermoplastics fittings for pressure piping systems - Test method for maximum deformation by crushing. This standard specifies a reliable test method to evaluate the mechanical durability of injection-moulded thermoplastics fittings used in pressure piping systems. The primary focus is to determine the maximum deformation these fittings can withstand under crushing forces without fracturing, ensuring the integrity and safety of piping infrastructure.

The standard applies specifically to injection-moulded thermoplastics fittings, which are widely used in various pressure piping applications due to their corrosion resistance, lightweight nature, and ease of installation.

Key Topics

• Scope of Testing
  SIST EN 802:1997 defines the crushing test procedure for thermoplastics fittings intended for pressure applications. The goal is to measure deformation limits under controlled force application to verify mechanical robustness.

• Maximum Deformation Measurement
  The standard outlines how to apply compressive force to fittings and measure deformation at the point of maximum compression just before fracture, providing quantifiable data on performance limits.

• Fracture Criteria
  The procedure helps identify whether fracture occurs during testing, which is critical for assessing fitness for use in pressure piping systems.

• Material Specificity
  Applies to injection-moulded fittings made from thermoplastics, covering commonly used materials in piping systems such as PVC, PE, and PP.

• Relevance to Pressure Piping Systems
  Ensures fittings used under pressure loading conditions meet minimum mechanical requirements to prevent failure during operation.

Applications

• Quality Control in Manufacturing
  Producers of thermoplastics fittings use this standard to verify product mechanical integrity and maintain consistent quality, ensuring fittings can withstand operational stresses.

• Product Certification
  Compliance with SIST EN 802:1997 supports certification processes by demonstrating that fittings meet established durability criteria under crushing forces.

• Design Validation
  Engineering and product development teams apply the test method to assess new fitting designs, optimize material selection, and improve product reliability.

• Safety Assurance in Infrastructure
  Utilities and contractors specify fittings tested according to this standard to enhance system safety and prevent leaks or ruptures in pressure piping networks.

Related Standards

• EN 12201 - Plastics piping systems for water supply and drainage, covering general product requirements and testing methods.
• EN ISO 1167 - Thermoplastics pipes - Test method for resistance to internal pressure.
• EN 1452 - Plastics piping systems for water supply using unplasticized polyvinyl chloride (PVC-U).
• ISO 4435 - Plastics piping and ducting systems - Injection moulded fittings - Test method for resistance to internal pressure.

Summary

SIST EN 802:1997 delivers a crucial methodology for assessing the mechanical limits of injection-moulded thermoplastics fittings used in pressure piping systems. By specifying the crushing test and criteria for maximum deformation without fracture, it helps manufacturers, engineers, and end-users ensure the safety, reliability, and durability of piping installations. Adoption of this standard facilitates quality assurance and compliance in the plastics piping industry, contributing to longer service life and reduced risk of failure in pressure piping applications.

Keywords: EN 802, plastics piping systems, injection-moulded thermoplastics fittings, crushing test, maximum deformation, pressure piping, mechanical durability, fracture testing, piping standards, CEN standard.