Pipe Joints | Types of Pipe Joints With Images – Pipe is manufactured in appropriate lengths for ease of handling, transporting, and installation, so pipe should be jointed. A joint may be required at a bend to change the direction of the pipe or to connect pipe for pipeline continuation, and this device is known as a pipe joint. These pipe joints should be watertight, long-lasting, and cost-effective.
Types of Pipe Joint
The conveyance and distribution of water in a water supply system necessitates a network of long pipelines. Pipes are not manufactured in a single length; HDPE coils can be 200 metres long, while other pipes are typically 2 to 6 metres long.
As a result, these pipes must be joined together in smaller lengths. Pipe joints come in a variety of shapes and sizes, depending on pipe materials, pressure resistance, durability, water tightness, and other factors.
Pipe joints commonly used in pipelines are as follows -:
- Collar Joints
- Expansion Joints
- Flanged Joints
- Screwed and Socket Joints
- Socket and Spigot (bell and spigot joint)
Collar joints are commonly used for cement concrete pipes with plain ends, both reinforced and pre-stressed. The collar is placed with a lap on both pipes, and the two ends of the pipes are brought to the same level with a rubber gasket in-between. The space between the collar and the pipe is filled with 1:1 cement mortar.
Expansion joints can withstand temperature changes, causing them to expand and contract. The purpose of this joint is to keep the joint watertight despite the stress caused by temperature changes.
The socket end is flanged with a cast iron follower ring that can be freely slid on the spigot end, and a rubber gasket is pressed tightly between the annular space of the spigot and socket by the bolt.
The rubber gasket maintains watertightness during slight forward and backward movement of the socket end due to temperature stress.
For CI pipes, steel pipes, and GI pipes, a flanged joint is commonly used. Figure 8-2 shows a joint that can be used for temporary work. so that it is simple to assemble and disassemble
Both pipes’ flanges are brought together and a gasket is placed between them, which is water tightened with a screw or welding. This joint is appropriate for pumping station filter plants, laboratories, and boiler houses, but it should not be used in areas where vibration and deflection are present.
Screwed and Socket Joints
For GI pipes and small diameter steel pipes, the screwed and socket joint is commonly used. The outer surface of both pipes has screw threads into which sockets are screwed to form the joint.
Socket and Spigot joint
Socket and Spigot (bell and spigot joint) – For both CI and DI pipes, the socket and spigot joint is commonly used. In this joint, the spigot of one pipe is inserted into the socket or bell end of the other pipe, and jute or hemp yam is tightly wrapped around the spigot up to a depth of 50 mm, and a gasket or joint runner is clamped in place of the round joint to fit tightly.
Molten lead was poured into the V shape opening left on the top by the clamped joint runner using a chalking tool. Molten lead fills the space between the hemp yam and the clamped runner.
After the lead has hardened, the runner is removed and tightened with a chalking tool and hammer. Lead in the range of 3.5 to 4 kg per joint may be required for pipes up to 150 mm in diameter, and 40 to 45 kg per joint for pipes up to 120 cm in diameter.