The Borehole Casings give structural integrity to the wall of the Borehole so that it does not collapse by controlling the movement of rock fragments, sand and gravel.
1. JOINING BOREHOLE CASINGS: They are made in sections that are screwed together to form longer lengths. Each casing has male and female threading to ensure it is able to be connected to the next pipe section. Most often the male threads are covered with a thread protector (before assembly) to prevent any damage on the threads.
2. HOW DEEP SHOULD THE BOREHOLE CASING PIPE BE? Since the casing is mainly used for protection, its depth should be able to provide the necessary protection. As a rule of thumb, the Borehole Casing should case the Borehole from top to bottom. It should also be at least 2m below the pump. This protects the pump from the wall collapse whilst also preventing mud and sand from entering into the pump.
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| Everything You Need To Know About Borehole Casing in Zimbabwe! |
4. HOW LONG SHOULD THE CASING PIPE BE? In unstable aquifers, it would be advisable to have the casing equal to the depth of the borehole (Casing from Top to Bottom.) Where there are rocks - depending on which one is greater - casings should be a depth of 20m minimum, below the ground or 10m into the bedrock.
5. STEEL OR PVC BOREHOLE CASING? Over the years (20th Century) steel has been the go-to choice for Borehole Casings, lately, with improvements to PVC, PVC has been the most common choice for casings.
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| Everything You Need To Know About Borehole Casing in Zimbabwe! |
CARE FOR CASINGS: Extreme care is required when installing casings, casing material may crack due to excessive bending when subjected to compressive or tensile stresses.
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