ISO 7076-2:2012

Overview

ISO 7076-2:2012 - Fire protection - Foam fire extinguishing systems - Part 2: Low expansion foam equipment - specifies requirements and test methods for low expansion foam equipment used in fixed-foam extinguishing systems for indoor and/or outdoor use. It applies to components such as sprayers, branchpipes, monitors, low expansion foam generators, and foam chambers. The standard defines low expansion foam (expansion ratio ≤ 20) and establishes performance, durability and safety criteria for manufacturing, testing and field use.

Key topics and technical requirements

• Scope and components: Applicable to a wide range of fixed low-expansion foam equipment (branchpipes, monitors, foam generators, foam chambers, sprayers).
• Performance tests:
  • Strength: Hydrostatic pressure test - equipment must withstand 4× maximum working pressure for 5 minutes (no rupture).
  • Leak resistance: Must resist 1.5× maximum working pressure for 5 minutes without leakage.
  • Discharge coefficient (K factor): Measured K must be within ±5% of manufacturer’s declared value.
  • Foam quality: Expansion ratio and 25% drainage time tested using the manufacturer’s recommended foam concentrate; compatibility checked against ISO 7203-1 / ISO 7203-3 values.
  • Range and water flow: Discharge range and water flow behavior are verified (no loose parts or leakage).
• Materials and durability:
  • Corrosion resistance for metal parts exposed to foam concentrate/solution (bronze noted as typical).
  • Plastics / reinforced resins: Ageing and liquid exposure tests; post-exposure mechanical properties must retain ≥50% of original tensile/impact/elongation values and show no cracking.
  • Elastomeric joint rings: Conform to Type W of ISO 4633.
• Environmental and reliability tests: Salt-spray, stress corrosion, light/water exposure, heat and fire resistance, operation reliability, vapour seal performance.
• Marking and documentation: Manufacturer’s marking and installation/operation instructions required.

Applications and who uses the standard

ISO 7076-2 is essential for:

• Equipment manufacturers designing and certifying low expansion foam components.
• Testing laboratories conducting compliance and type tests.
• Specifiers, architects and engineers selecting reliable foam systems for industrial plants, fuel storage tanks and high-risk indoor/outdoor environments.
• Facility managers and fire protection contractors performing acceptance testing, maintenance and replacement of foam system components. Benefits include improved safety, compatibility with foam concentrates, predictable performance, and regulatory compliance.

Related standards

• ISO 7203-1, ISO 7203-3 (foam concentrate characteristics)
• ISO 4633 (elastomeric joint rings)
• ISO 7-1, ISO 228-1, ISO 7005 (connections and flanges)
• ASTM G155, ISO 9227 (environmental exposure / salt spray)
• ISO 7076 (Part 1: foam proportioning; Part 5: compressed air foam - related series)

Keywords: ISO 7076-2:2012, low expansion foam equipment, foam fire extinguishing systems, foam generators, branchpipe, monitor, foam chamber, fire protection standard, discharge coefficient, foam quality, corrosion resistance.