Article
A Brief Description Of The Background And Operation Of The MEGALUG® System Of Restraint
April 5, 2010
•Article: A Brief Description Of The Background And Operation Of The MEGALUG® System Of Restraint
By EBAA Iron Sales, Inc.
The mechanical joint is one of the most versatile joints available for the water and wastewater industry. It was first patented in 1921 by W. D. Moore and the joint was standardized in the early 40's. The versatility of the joint is born out by its longevity. Since the time of its standardization through AWWA, the basic joint has not changed and still finds considerable use. This is especially true of fittings, valves, hydrants, and the like.
One thing that has changed and developed over the years is restraint for the mechanical joint. As the joint became popular, people searched for ways to restrain the joint and simplify the pipeline construction process. One style of restraint came onto the scene and has endured to this day. That is the set screw retainer gland. This product, unlike welded or grooved restraint, permitted the pipe to be cut and fabricated in the field. This feature is very important for pipeline configurations, above and below ground that must be changed to conform to existing conditions. However, the set screw retainer gland does have its drawbacks. The installation can be involved and complicated and there are significant limits to the performance of set screw restraint in larger sizes.
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