Ductile iron pipe has a wider variety of joints available than any other piping material, giving it greater versatility and flexibility in pipeline design and installation to accommodate various applications. These joints are time proven to be strong, dependable, and bottle-tight.
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Both push-on joints and mechanical joints are used with Ductile iron pipe installation. Push-on joints are comprised of a special bell with an internal groove, a plain end, and rubber gasket which is seated into the bell&#;s groove. This joint forms a watertight seal.
Mechanical joints most typically are used for Ductile iron pipe fittings and have four parts.
Grooved and Shoulder Joints use u-shaped coupling that goes around the plain end of a pipe that either has a groove cut into it or a shoulder threaded onto it. The u-shaped coupling fits into the groove to join/restrain the pipe.
Inside the u-shaped coupling is a gasket that compresses between the coupling and the pipe to form the watertight seal. This type of joint is used in above-ground applications. Grooved/shoulder joints should never be used in underground applications.
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Grooved joints are available in flex or rigid configurations depending on the need for deflection.
Ball and Socket Pipe has the greatest degree of deflection of any joint, for up to as much as 4.5 feet of offset for an 18-foot length of pipe. It ranges from twelve to fifteen degrees per joint. This joint describes itself.
Components of the River Crossing joint are machined to precise dimensions providing optimal deflection capabilities. Pipe class options are also available, providing installation options to either &#;float&#; or &#;sink&#; the pipe into place. Like the wing of an airplane, the structure and strength of this specialized joint serve to split any water or current it passes through harmlessly while it settles to the bottom of the waterway on its own.
This joint deflection may be horizontal or vertical. This deflection capability allows the pipe to be assembled on the bank or the back of a barge. The joints deflect as needed to adapt to the bottom of any waterway.
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