Which one of the following is the process of driving, pouring or forcing lead, oakum, plastic or other material into a joint to make it leak proof?
- ACaulkingCorrect
- BBedding
- CBenching
- DHaunching
Solution
Concept
Caulking means filling a joint with lead, oakum or similar material to make it leak proof.
Step-by-step solution
1. The question asks for the process of filling a joint to stop leakage. 2. In spigot and socket pipe joints, oakum (jute yarn) is packed first and molten lead is poured and pressed in. 3. This process is called caulking. 4. So the answer is (A).
Explanation
Caulking is the process of driving or pouring lead, oakum, plastic or other sealing material into a joint so that water or gas cannot leak. It is commonly done in cast iron spigot and socket pipe joints. The caulking tool presses the material tightly into the gap.
Why the other options are wrong
(B) Bedding is the layer of material laid below the pipe to support it. (C) Benching is the sloping concrete at the side of the channel inside a manhole. (D) Haunching is the concrete or fill placed at the sides of a pipe up to some height for support.
Shortcut
Caulk = seal the gap. Bedding, benching and haunching are support or channel works, not sealing.
Common mistake
Confusing haunching or bedding (pipe support) with caulking (joint sealing).
Correct answer: A) Caulking