Which one of these joints are not used in C.I. pipes ?

Explanation:

Analysis of the Correct Option

Cast Iron (C.I.) Pipes and Their Joints: Cast iron (C.I.) pipes are widely used in water distribution systems, drainage systems, and sewerage systems due to their durability, corrosion resistance, and ability to withstand high pressure. These pipes require proper joints to connect them securely and ensure leak-proof functionality. Several types of joints are used in cast iron pipes, such as Tyton joints, flanged joints, spigot and socket joints, etc. However, not all types of joints are suitable or used for C.I. pipes.

The Simplex joint is not typically used in cast iron pipes. This type of joint is more commonly associated with other pipe materials or specific applications unrelated to cast iron. The design and functionality of Simplex joints do not align with the requirements and characteristics of C.I. pipes. Instead, the joints used for C.I. pipes are specifically designed to accommodate their material properties, such as rigidity and brittleness, while ensuring a secure and durable connection.

Reason for the Correct Answer:

• Material Compatibility: Cast iron is a brittle material, and the joints used for it must provide adequate flexibility and sealing to accommodate minor movements and pressure variations. Simplex joints do not offer the required compatibility for cast iron pipes.
• Design and Application: The design of Simplex joints is not suited for the structural and functional needs of C.I. pipes. They are more commonly used in systems involving other materials, such as plastic or specific types of metal, where their design can be effectively utilized.
• Seal and Leak Prevention: Joints for cast iron pipes, such as Tyton joints or spigot and socket joints, are designed to provide a robust seal to prevent leaks, which is not a characteristic feature of Simplex joints.

Important Information

To better understand the rationale, let us analyze the other options:

Tyton joint

• Tyton joints are widely used in cast iron pipes. These are push-on joints that incorporate a rubber gasket to ensure a leak-proof connection. The flexibility provided by the Tyton joint makes it suitable for accommodating minor movements and pressure variations in pipelines, which is essential for the durability and reliability of cast iron pipe systems.

Flanged joint

• Flanged joints are commonly used in cast iron pipes for specific applications, such as connections to valves, pumps, or other equipment. These joints involve bolted flanges and gaskets to provide a secure and leak-proof connection. They are particularly useful in situations where pipes need to be dismantled for maintenance or repair.

Spigot and socket joint

• Spigot and socket joints are one of the oldest and most commonly used joints for cast iron pipes. In this type of joint, the spigot end of one pipe is inserted into the socket (or bell) end of another pipe, and the joint is sealed with materials such as lead or rubber gaskets. This type of joint provides a secure and durable connection, making it suitable for a wide range of applications in water supply and drainage systems.​