Butyl Tanks and Water Security in South Sudan: Strategic Storage for Humanitarian Operations

Introduction: Why Water Storage Matters as Much as Water Supply

In South Sudan and across East and Central Africa, securing safe water is not only about finding a source or deploying purification products. It is equally about storing that water safely, reliably, and at scale. In flood-prone, drought-affected, and conflict-impacted environments, the right storage solution can determine whether a WASH intervention is sustainable or fragile.

This is where Butyl tanks and advanced flexible storage systems become critical. As a strategic partner of Butyl Products, Specialized Logistics Solutions (SLS) supplies and supports high-performance water storage solutions including flexible onion tanks and steel-framed Oxfam-style tanks tailored to humanitarian and emergency operations.

The Operational Challenges of Water Storage in South Sudan

Humanitarian and government actors in South Sudan face a unique combination of constraints:

• Remote, hard-to-reach locations with limited road access

• Highly variable demand, from small community systems to large displacement sites

• Seasonal extremes, with both severe flooding and prolonged dry spells

• Strict donor and technical standards for water quality and infrastructure

Traditional storage options (fixed concrete tanks, improvised drums, or unlined earth pans) often fail to meet these demands. They can be slow to construct, difficult to transport, vulnerable to contamination, and hard to scale.

Butyl-based storage systems are designed precisely to overcome these constraints.

What Makes Butyl Tanks Different?

Butyl tanks and bladders are manufactured from high-grade butyl rubber or similar advanced elastomers, engineered specifically for safe, long-term water storage in demanding environments.

Key characteristics include:

• High chemical resistance and suitability for potable water

• Excellent flexibility for transport and rapid deployment

• Low permeability, reducing contamination and evaporation risk

• Robust mechanical strength, with resistance to puncture and abrasion when correctly installed

For humanitarian WASH operations, this translates into storage solutions that can be transported compactly, deployed quickly, and operated safely under field conditions.

Butyl Storage Solutions in the Humanitarian Context

SLS, in partnership with Butyl Products, supports a range of storage configurations commonly used by NGOs and UN agencies:

1. Flexible Onion Tanks

Onion tanks are self-supporting, open-top flexible tanks designed for rapid deployment:

• Ideal for short- to medium-term storage in emergency operations

• Commonly used as buffer storage in water treatment chains (e.g., raw water, treated water, chlorinated water)

• Quick to install and decommission, with minimal site preparation

In flood response or rapid-onset emergencies, onion tanks provide immediate storage capacity that can be integrated with pumps, treatment units, and distribution systems.

2. Closed Bladder Tanks

Bladder tanks are fully enclosed flexible tanks that minimise exposure to the environment:

• Suitable for potable water storage where contamination risk must be tightly controlled

• Useful in dusty, muddy, or high-contamination environments common in remote South Sudanese sites

• Can be installed inside shelters or under shade structures to reduce thermal stress

For operations where water quality and residual chlorine levels must be maintained over longer periods, bladder tanks provide a controlled storage environment.

3. Steel Oxfam-Style and Modular Tanks

Butyl Products also manufactures steel-framed tanks with butyl liners, often referred to as Oxfam-style or modular tanks:

• Provide large-volume storage (tens of thousands of litres) for camps, health facilities, and small towns

• Modular design allows for relatively rapid assembly compared to traditional civil works

• Compatible with gravity-fed distribution systems and elevated platforms

These tanks are well suited to semi-permanent WASH infrastructure in protracted crises, where reliability and scalability are essential.

Strategic Advantages of Butyl Tanks for Operations in South Sudan

1. Logistics Efficiency and Rapid Deployment

From a logistics standpoint, butyl-based tanks offer a significant advantage:

• Compact shipping volume: Tanks can be folded and transported in standard pallets or crates, optimising air and road freight.

• Reduced construction time: No need for extensive civil works or heavy equipment for basic installations.

• Scalability: Additional units can be deployed quickly as needs evolve.

For SLS and its partners, this means water storage capacity can be pre-positioned, redeployed, or scaled in line with seasonal and emergency demands.

2. Compliance with Humanitarian Standards

Donors and implementing agencies require storage systems that align with international standards for potable water:

• Butyl tanks are designed and manufactured to meet or exceed common WASH specifications used by NGOs and UN agencies.

• Materials are selected for compatibility with drinking water, including chlorinated supplies.

• Technical documentation and certifications support tendering, donor reporting, and audits.

This ensures that investments in storage infrastructure are technically defensible and compliant.

3. Integration with WASH and Pumping Systems

Butyl tanks are most effective when integrated into a complete water system. In SLS operations, they are often combined with:

• Pumps and pumping equipment for raw water abstraction, transfer, and distribution

• Water purification products and systems, including chlorination and filtration

• Distribution networks, such as tap stands, trucking operations, or household container distribution

This integration allows humanitarian actors to design end-to-end water supply chains, from source to storage to point of use.

Designing a Water Storage Strategy with Butyl Tanks

For organisations operating in South Sudan, water storage should be treated as a strategic asset, not an afterthought. A robust strategy typically includes:

1. Demand and Risk Analysis

Before selecting tank types and capacities, SLS works with partners to assess:

• Population size and projected growth (including displacement scenarios)

• Per capita water requirements in line with Sphere and agency standards

• Source reliability (boreholes, surface water, trucking) and seasonal variability

• Risk factors such as flooding, contamination, and access constraints

This analysis informs decisions on tank sizing, redundancy, and site layout.

2. Matching Tank Types to Use Cases

Different operational contexts call for different storage solutions:

• Emergency and surge response: Onion tanks and smaller bladders for rapid deployment and flexible positioning

• Protracted displacement sites: Larger bladder tanks and modular steel tanks for semi-permanent infrastructure

• Health facilities and institutional use: Enclosed tanks with controlled access and integration into existing plumbing

SLS helps align Butyl tank configurations with the specific needs of each site and programme.

3. Site Preparation and Protection

Even flexible tanks require thoughtful siting and basic preparation:

• Levelled, compacted ground with appropriate base material to protect the liner

• Drainage planning to prevent external water from pooling around the tank

• Physical protection from vehicles, livestock, and accidental damage

In flood-prone areas, tanks may be integrated with elevated platforms, bunds, or protective fencing to reduce risk.

4. Operation, Maintenance, and Lifecycle Management

To maximise the lifespan and performance of Butyl tanks, SLS supports partners with:

• Operator training on filling, emptying, inspection, and basic repairs

• Guidance on cleaning protocols to maintain water quality

• Recommendations for spare parts and repair kits suitable for field conditions

This ensures that storage assets remain reliable over multiple seasons and deployment cycles.

The SLS–Butyl Products Partnership: From Supply to Support

SLSs partnership with Butyl Products is built around more than just equipment supply. It combines:

• Manufacturer-grade product quality with field-tested designs

• Regional logistics capability, including warehousing and last-mile delivery in South Sudan, Uganda, and Kenya

• Technical advisory support on tank selection, system design, and deployment

For NGOs, UN agencies, and government institutions, this means a single partner can support the full chain from specification and procurement through to delivery, installation, and ongoing operation.

You can explore SLSs broader WASH and storage-related offerings here:

• Specialized Logistics Solutions  Home

• W.A.S.H Products

• Warehouses and Modular Structures

Conclusion: Butyl Tanks as a Foundation of Water Security

In South Sudans complex operating environment, water security depends on more than just finding and treating water. It requires reliable, scalable, and compliant storage infrastructure that can withstand logistical, environmental, and operational pressures.

Butyl tanksfrom flexible onion tanks to large modular steel systemsprovide that foundation. When deployed strategically and supported by a partner with deep regional expertise like Specialized Logistics Solutions (SLS), they enable organisations to stabilise water supply, protect public health, and meet humanitarian standards in some of the worlds most challenging contexts.

For organisations planning new WASH interventions or upgrading existing systems in South Sudan and the wider region, integrating Butyl-based storage solutions into programme design is a critical step toward long-term water security.