Fireproofing of pipe shafts and cable trays

Fireproofing pipe shafts and cable trays involves using certified fire-resistant materials and sealing systems to prevent fire and smoke from spreading through penetrations in walls, floors, and shafts.

Passive Fire Protection Overview

Passive fire protection (PFP) is designed to contain fire within a compartment, limiting damage and providing time for evacuation. It uses fire-resistant materials to seal gaps around pipes, cables, and trays, preventing fire propagation through penetrations in walls, floors, or ceilings. PFP systems are widely used in buildings, industrial facilities, offshore platforms, and critical infrastructure .

Fireproofing Materials and Systems

Common materials and systems for fireproofing include:

• Firestop packs and mineral wool: Used to fill gaps around pipes and cables; must be installed in an orderly sequence with gaps not exceeding 1 cm² .
• Fire-rated boards and backing plates: Provide structural support for large openings and enhance fire resistance .
• Intumescent caulks and sealants: Expand under heat to seal openings and prevent smoke and flame penetration .
• Fire protection coatings and tapes: Products like FLAMMOTECT-A and DG-CR 0.7 form a protective shield around cables, preventing flame propagation and maintaining functionality during fire .
• Moldable putty and elastomeric sheets: Conform to irregular shapes of cable trays and pipes, ensuring complete sealing .

Installation Guidelines

• Sequence: Install busways, conduits, and cable trays first, then apply firestopping materials after floor and wall finishes are complete .
• Gap management: Ensure all gaps inside and around metal trunking or pipes are tightly sealed, with packing thickness typically not less than 24 cm for large penetrations .
• Support plates: For slab penetrations, install fire-support plates at the top and provide 20–30 mm of firestopping material .
• Accessibility: Layout and positioning should allow for maintenance and retrofitting without compromising fire protection .
• Fire ratings: Choose materials with appropriate fire ratings (e.g., E15 to EI240, A0 to A60) depending on the application and regulatory requirements .

Compliance and Certification

Fireproofing systems should be tested and certified by recognized authorities to ensure compliance with local and international standards. Systems like Roxtec seals and UL-listed 3M firestop products provide verified protection for multiple hazards, including fire and smoke .

Key Considerations

• Electrical cables are a common source of fire; proper sealing prevents fire spread to adjacent compartments .
• Fireproofing solutions should also resist environmental factors such as moisture, UV, and chemicals when used outdoors or in industrial settings .
• Regular inspection and maintenance are essential to ensure the integrity of firestopping systems over time. By following these guidelines and using certified fire-resistant materials, pipe shafts and cable trays can be effectively fireproofed, enhancing safety and compliance in any facility.