Borehole Casing and Their Pressure Classes In Zimbabwe - What Is Borehole Casing With Nakiso Borehole Drilling

A Casing is a large-diameter pipe that is assembled and inserted into a recently drilled section of a borehole.

Similar to the bones of a spine protecting the spinal cord, the casing is set inside the drilled borehole to protect and support the water stream.

Borehole Casings in Zimbabwe come in sizes 110mm up to 250mm. The most popular sizes are 140mm and 180mm. These Borehole Casings also come in pressure classes, Pressure Class 6, Pressure Class 9, and Pressure Class 10. 

The Borehole Casings are manufactured with selected PVC compounds to provide absolute non-corrosive pipes with excellent mechanical properties. The Borehole Casing must be strong enough to withstand underground pressures.

The Purpose of Casing:
  • Prevents the pollution of water from the borehole.
  • Prevents unbalanced upper formations from caving in and sticking the drill string.
  • Provides a strong upper foundation to allow the use of high-density drilling fluid to continue drilling deeper.
  • Isolates various zones, which may have different pressures or fluids, in the drilled formations from one another.
  • Seals off high-pressure zones from the surface.
  • Prevents fluid loss into or contamination of production zones.
  • Provides a smooth internal bore for installing production equipment.

Borehole casings are manufactured with selected PVC compounds to provide absolute non-corrosive pipes with excellent mechanical properties.

The casings are joined by the use of solvent cement.

Advantages Include:

1. Corrosion: The chemical inertness of uPVC makes them insensitive to all forms of corrosion, thus being excellent products for use in Borehole Drilling.

2. Cost-effective: Lower installed cost compared to conventional (steel) casings.

3. Easy handling and installation: Tough, rugged material, with easy-to-assemble joints.

4. Lightweight: Much lighter than steel casings, makes them user-friendly installations and saves time.

5. PVC plastic material: Resistant to corrosion as well as acids and alkalis found in some soils. No additional protection required.

6. Internally and externally flush jointed: Easy installation in a borehole and improved flow of pumped water.

7. High modulus of elasticity: Makes for stiffer casings and screens which can be designed for boreholes up to at least 200m deep.

Get in touch with Nakiso Borehole Drilling Team for more information about borehole casing

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Five Facts About Borehole Drilling That You Need To Take Note Of:
1. Know Your Borehole Casings:The Preferred Borehole Casing In Zimbabwe Is Class 9 and 10 (Pressure Classes.)This is because Class 9 and Class 10 Casings are more collapse resistant. The strength of a Casing is often described as collapse resistance.

2. Borehole Drilling Depth: The exact depth, of where the water is located, cannot be established by the drilling contractor nor the Water Surveyor (Borehole Siter).

3. The Is No 100% Guarantee On Water: It is important to note that it is never a 100% guarantee that any hole will yield water, the amount and water quality can also not be guaranteed by the drilling contractor and water surveyor.

4. Borehole Siting or Water Surveying Is Important: Making use of a hydrologist or traditional water diviner will increase your chances of having a successful borehole that will yield a sufficient amount of water.

5. Know The Risks: The risk of the borehole drilling lies with the property owner. The client will still be liable for the drilling costs irrespective of a borehole yielding water or not.

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Nakiso Borehole Drilling has experience and knowledgeable workforce to work on any type of installation. From solar powered, electrical and manual pump installation, we do it all under one roof. Nakiso Borehole Drilling covers borehole siting, drilling and installation of pumps.