Bridge Crossings And The Proper Use Of EX-TEND®, FLEX-TEND®, And Force Balanced FLEX-TEND Products
Bridges can serve as very convenient structures for routing utility piping over obstacles such as rivers, canyons, or highways. Where allowed, there can be multiple lines utilizing the crossing. Of particular interest for this discussion is the locating of pressurized water lines on and under bridge structures. Pressurized pipelines can present a number of unique challenges to the design engineer and utility owner.
Bridge designs and water pipe designs vary widely across the country. Include in that mix the variety of municipal requirements and differences in environment and it’s possible to understand that developing hard and fast rules regarding the design and installation of waterline bridge crossings is difficult. This discussion, however, does not speak to all aspects of the design of a crossing pipeline. Its purpose is to bring forward a number of considerations and challenges that must be addressed during the design and construction process with the incorporation of the FLEX-TEND family of products from EBAA Iron Sales, Inc., plus the simplification that a Force Balanced FLEX-TEND offers. This family of products provides a variety of expansion and flexible-expansion joints to protect pipeline connections from the adverse affects of differential movement.