An inline overflow is an essential safety component in any modern water storage system. Designed to prevent overfilling, flooding, and contamination, inline overflows play a vital role in protecting both the tank and the surrounding environment. At Drayton Tank, we supply inline overflows for GRP water tanks that are fully compatible with potable water storage systems and UK Water Regulations.
What Is an Inline Overflow?
An inline overflow is a dedicated outlet installed directly into the wall of a water tank, allowing excess water to discharge safely once the tank reaches its maximum operating level. Inline overflows are commonly specified with:
- GRP water storage tanks
- WRAS approved water tanks
- Cold water storage systems
- Commercial and industrial tank installations
Unlike temporary or external overflow arrangements, inline overflows provide a controlled, secure, and regulation-compliant solution.
Why Inline Overflows Are Critical in Water Tank Systems
Without a correctly installed overflow, water tanks are vulnerable to:
- Overfilling and internal flooding
- Structural stress and panel damage
- Water contamination and backflow risks
- Failure to comply with UK Water Supply Regulations
Inline overflows ensure excess water is safely diverted away from the tank, helping to maintain system integrity and water quality.
Benefits of Inline Overflows
Installing an inline overflow provides multiple operational and compliance benefits:
✔ Prevents Overfilling & Flood Damage
Inline overflows automatically release excess water, protecting plant rooms, roofs, and surrounding infrastructure.
✔ Supports UK Water Regulations Compliance
Inline overflows are designed to meet the requirements of the Water Supply (Water Fittings) Regulations, particularly when used alongside screened outlets and air gaps.
✔ Maintains Potable Water Quality
Correct overflow design reduces stagnation and contamination risks in potable water storage systems.
✔ Durable & Long-Lasting
Manufactured from corrosion-resistant materials, inline overflows are ideal for long-term use in potable and non-potable water tanks.
Inline Overflows for GRP Water Tanks
GRP water tanks require carefully specified accessories to preserve their strength and hygiene standards. Inline overflows are particularly well suited to GRP tanks because they:
- Integrate seamlessly with GRP panels
- Provide a watertight, flanged connection
- Reduce stress on tank walls
- Can be positioned to suit site-specific layouts
All inline overflows supplied by Drayton Tank are fully compatible with our range of GRP sectional water tanks.
Typical Applications for Inline Overflows
Inline overflows are widely used across multiple sectors, including:
- Commercial buildings and offices
- Industrial water storage installations
- Hospitals, schools, and public sector buildings
- Agricultural water storage systems
- Emergency and backup water storage
- Rooftop and plant room tank installations
They are frequently specified alongside potable water storage tanks where safety and compliance are critical.
Inline Overflow Design & Specification Considerations
When specifying an inline overflow, the following factors should be considered:
- Water tank capacity and refill rate
- Overflow outlet size and pipe diameter
- Discharge route and termination point
- Screening to prevent debris or vermin ingress
- Compatibility with potable water standards
Correct sizing and positioning are essential to ensure reliable overflow performance during peak demand.
Why Choose Drayton Tank?
At Drayton Tank, we specialise in complete water storage solutions. By choosing us, you benefit from:
- ✔ Inline overflows designed for GRP water tanks
- ✔ Support for WRAS compliant water storage systems
- ✔ Technical advice and specification guidance
- ✔ Bespoke tank and accessory configurations
- ✔ Trusted UK water tank expertise
We work closely with contractors, consultants, and facilities managers to ensure every installation meets regulatory and performance requirements.
Speak to Our Water Storage Experts
If you need inline overflows for a GRP or potable water tank — or advice on specifying the correct overflow solution — contact Drayton Tank today.
📞 Call: 01142166000
📧 Email: info@draytontank.co.uk
🌐 Visit: www.draytontank.co.uk
