BESS – Energy storage

BESS – Energy storage

Battery Energy Storage Systems (BESS) play a crucial role in the modern energy landscape, balancing renewable supply with on-demand power. But these high-density electrical environments present unique safety and containment challenges where the risks of fire, gas release and thermal runaway must be tightly controlled.

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Designed for energy storage demands

CSD’s sealing systems are trusted across the energy sector to deliver certified protection in BESS installations. Our products provide long-term defence against fire, water, gas and smoke ingress, helping operators safeguard assets, maintain containment integrity, and meet the latest fire safety and environmental standards.

Our Case Studies

Up to 4 hours fire resistance (EI-rated) – tested and certified

Watertight and gastight sealing for critical containment areas

Resistant to heat, vibration and environmental exposure

Maintenance-free performance with 50+ year service life

Compatible with DNO, ATEX and WIMES requirements

Applications in BESS facilities

Some of the elements of your BESS facility that CSD Sealing Systems can protect with our world leading solutions:

Cable and pipe penetrations in battery enclosures and containers
Fire-rated sealing for switchgear and inverter rooms
Duct and conduit entries for underground power connections
Compartmentation between battery banks and control systems
Water ingress protection for external and below-grade installations
Retrofitted sealing during system upgrades or safety improvements

Aerial view of storage containers and electrical equipment

Key Sealing Solutions

Explore the products designed to help protect the cable and pipe entries, entry points and cable ducts in your BESS facility.

NOFIRNO Flexible Pipe Penetration Seal

NOFIRNO® Rapid Duct Seal

A fast-install, high-performance sealing system designed for speed-critical or restricted-access environments, offering reliable, water and gastight protection with full re-entry capability.

SLIPSIL Plugs

SLIPSIL® Sealing Plugs

Maintenance-free, tool-less installation for single or trefoil cable and pipe penetrations, providing a gas and watertight seal that remains fully re-enterable without the need for mechanical fixings.

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NOFIRNO® Flexible Pipe Penetration Seals

A versatile, certified system for metallic, GRP and plastic-coated pipes, providing up to four hours’ fire resistance alongside watertight and gastight performance. Flexible and re-enterable, it’s trusted worldwide for its long-term durability and ease of installation.

OFIRNO Flexible Pipe Penetration Seal

NOFIRNO® Plastic Pipe Penetration System

Specifically designed for the unique challenges of plastic pipes, this system provides certified fire and smoke protection while maintaining sealing performance as pipes soften or melt under heat. Ideal for civil, industrial and commercial projects where plastic services are widely used.

NOFIRNO Multi Cable Transits

NOFIRNO® Multi Cable Transits

Certified for up to four hours of fire resistance and pressure-tested for watertight performance, NOFIRNO® offers unmatched versatility for sealing mixed-diameter cables. Durable, re-enterable, and proven worldwide in civil, marine, offshore and industrial applications.

FYLLOFOAM Fire Protection

FYLLOFOAM® Fire Protection

A lightweight, flexible foam-based sealing solution, FYLLOFOAM® provides fire-rated protection for grouped cables while simplifying installation in irregular or hard-to-access spaces.

ACTIFOAM

ACTIFOAM® Fire Protection

Engineered for environments requiring adaptive sealing performance, ACTIFOAM® expands under heat to maintain fire integrity around grouped cables, offering an innovative solution for challenging layouts.

GlandMod Multi-Gland System

GlandMod® Multi-Gland System

A modular gland system that allows multiple cables to pass through a single entry point with individual sealing for each. Designed to reduce installation time while maintaining fire, water and gas protection.

Conduit

Frames and Conduit Systems

Robust steel frames and conduit systems designed to house CSD sealing solutions. Available in multiple configurations to suit round, square or rectangular penetrations, with proven fire and watertight performance.

Let’s protect your energy storage assets together

Get in touch with our technical team to discuss compliant, future-ready sealing strategies for your battery storage projects.

Aerial shot of electrical substation

“The service provided by CSD was excellent in all aspects. The installation crew were skilled, hard-working and resourceful and also integrated well with our own men who supported then with the external duct sealing.”

Project Manager

UK Onshore Wind Farm