When storing potable water, compliance, durability, and water quality are critical. WRAS approved GRP water tanks provide a reliable, regulation-compliant solution for domestic, commercial, and industrial water storage. At Drayton Tank, we supply high-quality Glass Reinforced Plastic (GRP) water tanks designed to meet UK Water Regulations and deliver long-term performance.

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What Is a WRAS Approved GRP Water Tank?

A WRAS approved water tank has been tested and certified by the Water Regulations Advisory Scheme to ensure it is safe for contact with drinking water. This approval confirms that materials used in the tank will not cause contamination, taste, odour, or bacterial growth.

GRP (Glass Reinforced Plastic) is a composite material made from reinforced fibres and resin, offering exceptional strength, corrosion resistance, and hygienic performance — making it ideal for potable water storage.

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Benefits of WRAS Approved GRP Water Tanks

Choosing a WRAS approved GRP tank offers multiple advantages:

✔ UK Water Regulations Compliance

WRAS approval ensures full compliance with Water Supply (Water Fittings) Regulations, helping avoid installation delays or regulatory issues.

✔ Safe Drinking Water Storage

Smooth internal surfaces reduce sediment build-up and bacterial growth, maintaining clean and safe potable water.

✔ Long Service Life

GRP tanks do not rust, corrode, or degrade like steel or galvanised tanks, resulting in a significantly longer lifespan.

✔ High Strength & Structural Integrity

GRP tanks are lightweight yet extremely strong, suitable for both internal and external installations.

✔ Low Maintenance

Minimal maintenance requirements reduce long-term operational costs.

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GRP Water Tanks vs Other Materials

Compared to traditional materials, GRP water storage tanks offer clear advantages:

Tank Type	Durability	Corrosion Resistance	WRAS Approved Options
Galvanised Steel	Medium	Low	Limited
Plastic (MDPE)	Medium	High	Yes
GRP	High	Very High	Yes (Preferred)

GRP is widely specified for commercial and critical water storage applications where reliability is essential.

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Applications for WRAS Approved GRP Water Tanks

Our WRAS approved GRP water tanks are suitable for a wide range of uses, including:

• Potable water storage for residential buildings
• Commercial and industrial premises
• Hospitals, schools, and public buildings
• Agricultural water supply systems
• Emergency and backup water storage
• Construction and infrastructure projects

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Sectional GRP Water Tanks Available

Drayton Tank supplies sectional GRP water tanks, allowing large-capacity storage to be installed in restricted access areas. These modular tanks are ideal for plant rooms, rooftops, and confined spaces.

Available options include:

• Internally flanged and externally flanged panels
• Insulated GRP water tanks
• Custom capacities and dimensions
• Full installation support

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Why Choose Drayton Tank?

When you choose Drayton Tank, you benefit from:

• ✔ WRAS approved GRP water tanks
• ✔ UK-based expertise and support
• ✔ Bespoke tank solutions
• ✔ Technical advice and aftercare
• ✔ Reliable delivery and installation guidance

We work closely with contractors, consultants, and end users to ensure the correct water tank specification for every project.

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Get a Quote for WRAS Approved GRP Water Tanks

If you’re looking for WRAS approved GRP water tanks that offer durability, compliance, and peace of mind, contact Drayton Tank today.

📞 Call: 01142166000
📧 Email: info@draytontank.co.uk
🌐 Visit: www.draytontank.co.uk

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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

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When it comes to storing potable water, safety and quality aren’t optional — they’re essential. That’s why at Drayton Tank, we’re proud to offer WRAS Approved GRP Water Tanks that stand the test of time and meet the highest standards for drinking water storage in the UK.

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🌍 What Does WRAS Approval Mean?

WRAS (Water Regulations Advisory Scheme) approval is the benchmark for products that come into contact with drinking water. WRAS-approved tanks have been independently tested and certified to ensure they won’t contaminate the water they hold. This gives you peace of mind that your water remains clean, safe, and compliant with UK water regulations.

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💪 Why Choose GRP Water Tanks?

GRP (Glass Reinforced Plastic) tanks are a modern, high-performance solution for potable water storage. They combine strength, durability, and reliability — making them ideal for domestic, commercial, and agricultural applications.

Here’s what makes GRP tanks stand out:

• Exceptional Chemical Resistance – GRP won’t corrode or degrade when in contact with water or common substances found in water systems.
• High Strength-to-Weight Ratio – Built tough without being heavy, so installation is easier and infrastructure strain is lower.
• Long Lifespan – GRP resists cracking, rusting, and UV exposure, giving you a tank that lasts for decades with minimal maintenance.
• Hygienic & Clean – The smooth internal surface discourages bacterial growth, keeping your stored water clean and safe.

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🚰 Benefits of WRAS Approved GRP Tanks

When you combine WRAS approval with GRP construction, you get a water tank solution that delivers:

✅ Regulatory compliance for potable water installations
✅ Safe drinking water storage that protects public health
✅ Robust performance in all environments
✅ Reduced lifecycle costs due to durability and low maintenance
✅ Quality assurance backed by independent certification

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🏢 Perfect for Multiple Applications

WRAS Approved GRP Water Tanks are versatile and ideal for:

• Residential rainwater harvesting systems
• Commercial buildings and facilities
• Emergency water storage
• Agricultural water supply
• Construction sites and temporary water provision

No matter the scale of your project, you can count on a tank that performs reliably and safely.

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🛠️ Custom Options & Expert Support

At Drayton Tank, we know no two projects are exactly alike — so we offer:

✔ Bespoke sizing and configurations
✔ Delivery and installation guidance
✔ Aftercare & maintenance advice
✔ Technical support from experienced professionals

Whether you’re upgrading an existing system or planning a new installation, we’re here to help you choose the right WRAS Approved GRP Water Tank solution.

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📞 Get in Touch

Ready to secure safe, compliant, long-lasting water storage? Contact our team today for a quote or to discuss your requirements.

👉 Email: info@draytontank.co.uk
👉 Phone: 01142166000
👉 Visit: www.draytontank.co.uk

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Thank you for choosing Drayton Tank — where quality, safety, and reliability flow together!

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Most tanks require an overflow to comply to water regulations

part of the regulations are to prevent the inlet getting submerged and thus increases the change of contaminating the mains supply

therefore to help reduce this tanks and vessels should be fitting with an overflow so that if the water level becomes higher that normal say due to the inlet not shutting off the water has some where to go via the overflow to prevent the level submerging the inlet and potentially filling beyond the top of a tank and spilling over and into the surrounding area

in conclusion any tank not designed as a pressure vesssel should have an overflow and vent to equalise any pressure from water coming into the tank and the vacuum from the water going out,

for water tanks the overflows and vents should also be screened with a mesh to prevent ingress of debris and insects rodents and other vermin

see our range of overflow fitting’s here

Here at Drayton Tank we provide several variations on the same tank capacities and sizes, we have briefly detailed these types below to help you when choosing a tank suitable for your requirements.

Water Tank Types:

One Piece Water Tanks –

The One Piece Tank type is a single moulded Open Top Tank that is supplied with a Bolted Lid, the tank is manufactured from approved materials for its purpose including Potable Drinking Water (WRAS Approved),

The Tank is normally supplied with the bolted lid, the lid should always be bolted down as it provides integral support to the tank walls, the tank can also be supplied open top, which usually requires the tank to be made stronger,

Two Piece Water Tank Types –

The Two Piece Tank Type is moulded in Two Sections, split horizontally half way up the internal height of the tank with a bolted flange for fixing back together once in situ with the supplied bolted and mastic sealer,

The two sections are usually rotated to allow them to pass through the restricted access, The sections can also be specifically designed to fit through a required gap eg doorways, which may require the tank to become a Three piece water Tank.

Sectional Water Tank Types –

Sectional Tanks are Water tanks made up of a number of panel to create a larger tank in a space like a basement where restrictions like doorways and corridors and stairwells prevent a single large tank access.

Sectional tanks themselves come in 3 Different Water Tank Types

IFB – Internally Flanged Base – this is the most common type of sectional tank and is externally flanged sized and lid, with the tank base being internally flanged so the external of the tank base is flat and suitable to be placed onto a flat smooth concrete floor, pad or other flat surface – These tanks require 500mm Around each side to allow assembly.

EFB – Externally Flange Base – These sectional are externally flanges on the sides, lid and base, and are designed to sit on Pillars, walls or Steels that are raised off the ground, also classed as fully draining sectional tanks, the supporting Steels or walls should match the joints on the tank panels (usually 1m) so the external flange of the base panels rest centrally on each steel or wall. – These tanks require 500mm Around each side to allow assembly.

TIF – Totally Internal Flanged – TIF Tanks are produced with all flanges internally bolted, this means the tank only needs 50mm around the tank to enable assembly, utilizing the space available, these tanks can be sat on a concrete Floor or plinth.

Twin Compartment Water Tanks –

These tanks are usually one of the above types of tanks, with the added feature of a division plate inside the tank to create two separate compartments, usually the plate is centrally spaced to give two equal compartments, also can be off centre if required by the design,

The tank would usually require 2x the accessories and fittings to provide the access and the fittings to each side, enabling the tank to be drained down and maintained whilst keeping one side in operation.

What are BSP thread sizes?

British Standard Pipe (BSP) thread is a standard thread type used extensively across the globe for plumbing connections (but not in North America).

The standard defines the number of threads per inch (pitch) as well as the angle that each thread is engineered to. BSP threads have rounded valleys and troughs with a 55 degree pitch (this is known as Whitworth type).

BSP sizes are always in imperial measurements and some have commonly metricised names. The table below summarises BSP sizes to help with general identification. Major diameter is slightly less than the actual outside diameter of the threads. Minor diameter is the measurement of the inside of a female threaded connection, from thread to thread.

There are two types of BSP threads; Tapered (BSPT) and parallel (BSPP). The vast majority of BSP threads for water fittings are parallel.

BSP Size	Also Known As	Actual Diameter (Imperial)	Actual Diameter (Metric)
1/8″		0.35 inch	9mm
1/4″		1/2 inch	12mm
3/8″		6/10 inch	15mm
1/2″	15 BSP	3/4 inch	19mm
5/8″	18 BSP
3/4″	20 BSP	1 inch	25mm
1″	25 BSP	1 & 1/4 inch	31mm
1 & 1/4″		1 & 2/3 inch	40mm
1 & 1/2″		1 & 3/4 inch	45mm
2″		2 & 1/4 inch	57mm
2 & 1/2″		2 & 7/8 inch	73mm
3″		3 & 1/3 inch	85mm

Introduction:

1. SwiftFlow: Redefining Speed and Efficiency:

The core value proposition of SwiftFlow lies in its ability to deliver top-notch GRP (Glass Reinforced Plastic) water tanks at an unprecedented speed, ensuring swift installations and minimized project timelines. Thanks to a streamlined production process and optimized supply chain management, SwiftFlow has achieved a remarkable feat by reducing the typical delivery time from months to a mere two weeks. This breakthrough not only empowers businesses with enhanced operational efficiency but also enables them to respond quickly to water storage needs, ultimately increasing productivity and reducing downtime.

2. Uncompromised Quality and Durability:

Despite its rapid delivery time, SwiftFlow never compromises on the quality and durability of its water tanks. Crafted from high-grade GRP materials, these tanks boast exceptional strength and longevity, ensuring reliable performance even in the most demanding environments. SwiftFlowWater tanks are engineered to withstand extreme temperatures, corrosive substances, and UV radiation, making them ideal for a wide range of applications. With a focus on quality assurance, every tank undergoes rigorous testing to meet the highest industry standards, ensuring leak-free and reliable storage for years to come.

3. Customizable Solutions for Diverse Applications:

Recognizing the diverse needs of different industries, SwiftFlow offers a wide range of tank sizes and configurations to accommodate various water storage requirements. Whether you need a compact tank for a residential setting or a large-capacity tank for industrial use, SwiftFlow has you covered. The ability to customize dimensions, fittings, and accessories ensures that each tank is tailored precisely to meet the customer’s unique specifications. Furthermore, SwiftFlow’s experienced team of engineers and consultants are readily available to offer expert advice and assistance, ensuring the perfect solution for every application.

4. Seamless Installation and Maintenance:

In addition to their remarkable delivery time, SwiftFlow tanks are designed with ease of installation and maintenance in mind. With their lightweight yet robust construction, these tanks are effortless to transport, maneuver, and install. The modular design allows for quick assembly on-site, reducing installation time and associated costs. Moreover, SwiftFlow provides comprehensive documentation and support to guide customers through the installation process, making it accessible even to those with limited technical expertise. Furthermore, regular maintenance and cleaning of SwiftFlow tanks are simple tasks, allowing businesses to focus on their core operations without undue interruptions.

Conclusion:

SwiftFlow has revolutionized the water storage industry by introducing a range of GRP tanks that can be supplied and delivered within an astonishing two-week timeframe. This breakthrough empowers businesses with unmatched speed, reliability, and flexibility in their water storage projects. With SwiftFlow, organizations can now procure high-quality GRP water tanks precisely tailored to their needs, all without compromising on quality or durability. As we witness the future of water storage unfold, SwiftFlow emerges as the definitive choice for industries and applications that demand efficient and dependable water storage solutions.

Water Storage Tanks cost

Discover the cost factors and pricing information for water storage tanks at Drayton Tank & Accessories Ltd. Our comprehensive guide explains the key factors that influence the cost of water storage tanks, such as tank size, material, installation requirements, customization, and location. Request a personalized quote today to get accurate pricing for your specific needs. Trust Drayton Tank & Accessories Ltd for high-quality storage solutions that protect your valuable resources

Choose from our wide range of standard-sized water storage tanks designed to meet your specific needs. Whether you require a compact tank for residential use or a larger tank for commercial applications, we have you covered. Our water tanks come in various capacities, including small, medium, and large sizes, ensuring you find the perfect fit for your requirements. Rest assured, our tanks are built to last, made from high-quality materials to provide durability and longevity. Browse our selection of standard sized water storage tanks and enjoy reliable water storage solutions for your home, business, or industrial needs., bespoke and custom size available on requested – Call us for best prices.

Many More Sizes and Capacities available on top of this list up to 100,000 litres