New Technical Document Announced for HDPE Pipe Use in Seismic Sensitive Areas

IRVING, TX – The Municipal Advisory Board (MAB) of the Plastics Pipe Institute, Inc. (PPI) nowadays introduced the publication of a new specialized doc that offers data for significant-density polyethylene (HDPE) drinking water strains in earthquake delicate regions. MAB-9, Design of HDPE Drinking water Mains for the Lateral Unfold Seismic Hazard is offered for no cost on the group’s internet site.

“This is the 1st document of its form that delivers the rationale, info and formulation for pinpointing the appropriate wall thickness for a fused, highly ductile, versatile HDPE drinking water major in a seismically sensitive region, subjected to an induced lateral unfold,” stated Camille George Rubeiz, P.E., F. ASCE, co-chair, Municipal Advisory Board and senior director of engineering, Municipal and Industrial Division of PPI. 

MAB serves as an impartial, non-professional adviser to the Municipal & Industrial Division of PPI, the big North American trade affiliation representing the plastic pipe sector.

The MAB-9 Endeavor Team was created up of marketplace specialists who volunteered their time. It was headed by Michael O’Rourke, Ph.D., P.E., F.SEI, M.ASCE, professor emeritus civil engineering, Rensselaer Polytechnic Institute (Troy, NY).

What Wall Thickness?

“Experience implies that substantial-density polyethylene pipe does very well in earthquakes,” O’Rourke claimed, “but engineers like to have ways to estimate and substantiate their layout. Listening to what somebody else claims that, ‘Oh certainly, the pipe is great’,  but they still are confronted with the query of ‘what wall thickness do I have to have?’  ‘I have this unique diameter pipe and it really is heading to be buried this much underneath the ground so what wall thickness do I will need for some expected seismic party?’  The aim is to have HDPE pipe that will be in a position to face up to the envisioned earthquake masses on this inherently ductile substance. With that in brain, MAB assumed it would be valuable to build a doc that offers designers with some interactions, tables, formulas, et cetera, that they can use to figure out how thick the wall would want to be for an envisioned lateral distribute. And which is the intent of the MAB-9.

“HDPE is recognized as a ongoing pipe, which indicates the pipe segments, which are 40 feet to 50 toes extended, are fused together,” he ongoing. “The ductile iron or forged iron pipe has joints each and every 15 or 20 ft, and the harm from a seismic function routinely happens at individuals joints. Continual pipe, no matter whether it is really welded metal or large-density polyethylene, ordinarily does improved than segmented pipe in earthquakes. HDPE has the extra advantage about steel (and all other resources) in that it is highly ductile, versatile and corrosion resistant and so it can move with the earth as opposed to striving to resist the deformations that the earth is imposing on it.”

An Critical Document

Rubeiz elaborated, “MAB-9 is essential for several motives. Proper wall thickness is pretty essential, specifically with earthquakes, and floor motion. Additionally, there proceeds to be a dire have to have to substitute the growing older infrastructure, particularly pipes that are more mature and brittle that lots of seismic functions will lead to them to crack. HDPE pipe and the details contained in MAB-9 will help in all those substitution packages to deliver a appropriate and resilient  water most important technique. 

“We would also like to thank the other MAB customers and supporting engineers who presented their time and knowledge to the undertaking – Robert Diamond, P.E., City of Palo Alto, CA Casey Haynes, P.E., Metropolis Utilities, Springfield, MO Monthly bill Heubach, P.E., M. ASCE, Seattle Public Utilities, WA Harvey Svetlik, P.E., GPPC, TX and Gerry Groen, P.Eng., Infra Pipe Options, ON.”

MAB-9, Style and design of HDPE Water Mains for the Lateral Spread Seismic Hazard can be located at:

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