Introduction
Planning to drill a borehole in Kenya? Great move! But before you go full throttle, there’s one key component you need to understand—borehole casing. Whether you’re sourcing water for your home, farm, or factory, the type of casing you choose can make or break the performance and lifespan of your borehole.
What Is Borehole Casing?
Borehole casing is a protective pipe inserted into the drilled hole to prevent collapse and contamination. It stabilizes the borehole walls and ensures clean, uninterrupted water flow.
Types of Borehole Casing in Kenya
In Kenya, the most commonly used casings are:
PVC Casing (Polyvinyl Chloride)
A plastic-based option that’s affordable, non-corrosive, and widely available.
Steel Casing
A heavy-duty option used in deeper, more demanding projects—especially where soil or water conditions are harsh.
PVC Casing – Features and Benefits
Lightweight and Easy to Handle
PVC pipes are much lighter than steel, making transport and installation easier—especially in remote areas.
Corrosion Resistance
PVC doesn’t rust, which is perfect for areas with acidic or salty water.
Lower Cost
PVC is generally cheaper than steel, both in material and labor.
Common Sizes in Kenya
Standard diameters include 4″, 6″, and 8″, suitable for most domestic boreholes.
Steel Casing – Features and Benefits
High Strength and Durability
Steel casing can withstand collapsing pressure, making it ideal for deep or unstable soils.
Suitable for Harsh Ground Conditions
If you’re drilling in rocky or volcanic areas (like parts of Nakuru or Kisii), steel handles the pressure better.
Long Lifespan
With proper anti-corrosion coating, steel casing can last decades.
Availability
Available from most reputable suppliers including Protech Water and Solar Equipment Company.
Comparing PVC vs. Steel Casing
| Feature | PVC Casing | Steel Casing |
|---|---|---|
| Durability | Moderate | Very High |
| Installation | Easy | More labor-intensive |
| Cost | Affordable | Expensive |
| Corrosion | Resistant | Requires coating |
| Suitability | Soft soils | Hard/rocky soils |
Factors to Consider When Choosing Casing
Depth of Borehole: Deeper wells need stronger casing.
Water Chemistry: Steel may corrode in salty or acidic water.
Soil Composition: Rocky soil demands steel; sandy soil may work with PVC.
Budget: PVC is cost-effective but not ideal for all conditions.
Borehole Casing Installation Process
Drill the borehole to the required depth.
Insert the casing while maintaining alignment.
Grout the outer casing to seal off contaminants.
Install screens at the appropriate depth to allow clean water in.
Casing Standards in Kenya
The Water Resources Authority (WRA) regulates casing sizes, thicknesses, and installation methods. Always work with licensed contractors who follow national standards.
Borehole Screen Integration
The screen is a slotted section of the casing that allows water in while keeping out sand and debris. It must be properly positioned based on the hydrogeological survey.
Borehole Casing for Domestic Use
PVC casing (6″ diameter) is perfect for home boreholes less than 150 meters deep in soft to medium soil.
Borehole Casing for Commercial or Agricultural Use
Steel casing is better for high-demand or deep boreholes used on farms, hotels, and factories.
Common Problems with Poor Casing Choices
Cave-ins when casing isn’t strong enough
Corrosion in aggressive water environments
Reduced water yield due to blocked screens or collapsed casing
Costly Repairs down the road
Where to Buy Borehole Casing in Kenya
Look for reliable suppliers who understand local conditions. We recommend Protech Water and Solar Equipment Company for quality PVC and steel casing, plus expert advice.
Cost Breakdown
PVC Casing: KES 1,200–2,000 per meter (depending on diameter)
Steel Casing: KES 3,500–6,000 per meter
Installation Labor: KES 10,000–25,000 (project-dependent)
Prices vary based on location, quality, and availability.
Conclusion
Choosing the right casing is just as important as choosing the right drilling rig. Whether you go with PVC or steel, make sure it’s suited to your soil, water chemistry, and budget. Consult professionals like Protech Water and Solar Equipment Company for recommendations tailored to your project. A well-cased borehole means clean, safe water for years to come.
FAQs
1. Can I use PVC casing in all areas of Kenya?
No. In rocky or deep areas, steel is safer and more durable.
2. How long does PVC casing last?
Up to 25 years if installed properly and used in non-corrosive environments.
3. Does steel casing always rust?
Not if it’s coated with anti-corrosion materials and well-maintained.
4. Can I mix PVC and steel in the same borehole?
It’s possible, but consult your contractor. Joint compatibility and sealing are critical.
5. What’s the best casing for salty water areas like coastal Kenya?
PVC is preferred due to its corrosion resistance.