Intumescent Fire Paint & Coatings (IS 15183) for Structural Steel in Heavy Engineering Plants, Odhav GIDC

Designing proper safety profiles is essential for any industrial or corporate facility. For businesses operating in Gujarat, fire safety is both a legal necessity and a critical investment to protect employees, assets, and business continuity. Under the National Building Code (NBC 2016 Part 4) and the Gujarat Fire Prevention Act, facility occupiers must install certified safety systems and secure valid Fire NOC approvals. This guide explores the engineering standards, installation rules, and compliance requirements in detail.

Why Steel Structures Require Passive Fireproofing

Odhav GIDC is a major manufacturing hub for heavy engineering, casting, and metal fabrication. Many factories utilize steel portal frame structures. While steel is non-combustible, its mechanical strength drops rapidly during a fire. At 550°C, structural steel loses half its load-bearing capacity, presenting immediate collapse risks. Passive fireproofing coatings are essential to buy time for evacuation and firefighting operations.

1. Spheroidized Char Formation Chemistry

Intumescent paint consists of three active chemical components: an acid source (ammonium polyphosphate), a carbonific source (pentaerythritol), and a blowing agent (melamine). Under heat (exceeding 200°C), these components react. The blowing agent releases nitrogen gas, expanding the melting polymer matrix into a dense, carbonaceous foam char that acts as a thermal barrier.

2. Sizing DFT based on Steel Section Factors (Hp/A)

The paint thickness required is determined by the steel profile's section factor (Hp/A), which represents the ratio of the steel section's heated perimeter to its cross-sectional area. A thin steel column heats up faster than a thick beam, requiring a higher Dry Film Thickness (DFT) of paint to achieve the same 120-minute fire rating. DFT must be calculated for each specific structural component.

3. QA/QC Audits and DISH Inspector Approval

During factory audits, DISH inspectors require material test certificates (complying with IS 15183 or BS 476 Part 21) and certified DFT reports. Coatings must be applied by trained applicators using airless spray pumps, and thickness must be verified using calibrated magnetic dry-film gauges. JSNM Engineers provides certified passive steel coating applications in Ahmedabad.

Frequently Asked Questions