www.heatingandventilating.net Mechanical riser solutions
There are three ways to accommodate for thermal movement within risers using a grooved mechanical system.
The first method is called top of riser free-floating method and involves installing rigid couplings on the riser and two flexible couplings on the horizontal adjacent piping at the top of the riser, which can reduce the need for riser clamps during installation and allows the system to move freely within the design tolerances.
The second method involves working with grooved expansion loops which help to save up as much as 2/3 of the size of welded U-shaped expansion loops and avoids forced welded pipe deflection. While welded expansion loops require eight welded joints to assemble, the forces exerted on the joint are far greater than those applied on a grooved expansion loop, and generate greater stress, which ultimately requires larger anchors and guides in order to direct the movement. The third method is working with grooved expansion joints such as the Victaulic Style 155 which are maintenance-free for the life of the system.
Importance of anchors
In a system using only flexible joints, risers are installed with anchors at the top and bottom and the piping guided every other length to prevent angular deflection at the joints within the piping run. Anchors distribute the movement forces across the structure and also provide the important task of directing fferential
movement between the piping and the building structure, which forces the pipe to thermally expand or contract from that location. This allows the design engineer to control how and where the movement in a system occurs and to provide the best solution to accommodate that movement.
Following customer feedback, Victaulic recently upgraded its A10 Grooved Riser Anchors to a standard product. With the primary functions of carrying the weights and forces which act downward to the base of the riser and connecting the riser to the rest of the structure, the anchor has been providing sturdy support for some of the tallest buildings around the world.
Future trends for high-rise buildings
One trend already taking place, and I expect to continue, is contractors bringing riser experts into the project at an earlier stage. It just seems to make logistical sense to operate in this fashion. It’s a more efficient use of time to collaborate early in the process. I believe contractors and engineers will seek assistance from companies such as ourselves to help design blueprints together, working in tandem to produce the right solution.
Vertical buildings are on the rise. For generations people have been moving to urban areas, putting greater demand on housing residents and employees. Through the use of grooved coupling solutions as an alternative to traditional methods, contractors can benefit from greater flexibility, reliability, ease of installation and ultimately and most importantly, speed of the installation process.
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www.heatingandventilating.net
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