Various types of Joints
• Spigot and Socket Joints or Bell & Spigot Joints
This types of joints is mostly used for cast iron pipes For the construction of this joint the spigot or normal end of one pipe is slipped in socket or bell mouth end of the other pipe until contact is made at the base of the base of the bell.
• Expansion Joints This joint is used at such places where pipes expand or contract due to change in atmospheric temperature and thus checks the setting of thermal stresses in the pipes
• Flanged Joints
This joint is mostly used for temporary pipe lines, because the pipe line can be dismantled and again assembled at other places.
Flexible Joints
• Sometimes this joint is also called Bell & Socket or Universal Joint. This joint is used at such places where settlement is likely to occur after the lying of the pipes. This joint can also be used for laying of pipes on curves, because at the joint the pipes can be laid at angle. This is a special type of joint. The socket end is cast in a spherical shape.
After this the retaining ring is slipped which is stretched over the bead. Then a rubber gasket is moved which touches the retainer high. after it split cast iron gland ring is placed, the outer surface of which has the same shape as inner surface of socket end.
Mechanical Joints
• This type of joints are used for jointing cast Iron, Steel or wrought Iron pipes, when both the ends of the pipes are plain or spigot. There are two types of mechanical joints.
Dressers- Couplings
• It essentially consists of one middle ring, two follower rings and two rubber gaskets. The two follower rings are connected to-gather by bolts and when they are tightened,
Victaulic Joint
• In this type of joints a gasket or leak-proof ring is slipped over both the ends of the pipes. This gasket is pressed from both the sides by mean of half iron couplings by bolts. The ends of pipes are kept sufficient apart to allow for free expansion, contraction and deflection.
Screwed Joints
The joint is mostly used for connecting small diameter cast iron, wrought iron and galvanized pipe. The end of the pipes have threads outside, while socket or couplings has threads on the inner side
Collar Joint
This type of joint is mostly used for joining big diameter concrete and asbestos cement pipes. The ends of the two pipes are brought in one
level before each other. Then rubber gasket between steel rings or jute rope socked in cement is kept in the grove and the collar is placed at the joint so that it should have same lap on both the pipes.
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