Earthquake Resistant Ductile Iron Pipe (ERDIP)
In 1893 Kubota began supplying iron pipes for the safe delivery of drinking water in Japan. Since then Kubota has been working continuously on technical innovation and developing superior pipe products so that in 1974, Kubota released the world’s first Earthquake Resistant Ductile Iron Pipe (ERDIP).
Kubota’s ERDIP which can be used for anything from distribution lines to trunk lines, and ranges in size from 3 to 104 inches (75 to 2600 mm), has had no documented failures or leaks caused by earthquakes, including the 2011 Great East Japan earthquake which measured 9.0 on the Richter scale. This excellent seismic performance is why Kubota’s ERDIP is used by so many Japanese water agencies today.
Since its introduction the volume of ERDIP produced by Kubota has increased steadily with marked growth beginning after the 1995 Kobe earthquake. ERDIP has become so popular that it now accounts for over 90% of the ductile iron pipe market in Japan, with over 41,000 miles of ERDIP pipe being installed so far. That’s enough to go around the world one and half times! We have also started to see ERDIP being adopted by municipalities in the U.S. and Canada including Los Angeles, San Francisco and Vancouver.
Los Angeles County Installation
Santa Clara Valley Installation
We are confident that our unique ERDIP product will help improve the resiliency and reliability of our owners’ water supply for years to come.
Concept
The ERDIP absorbs the large ground displacement by joint extension/contraction, deflection, and
anti-pull out structure. When one joint fully extends, the joint can pull the next pipe one after another like a buried chain. Therefore, we call this pipeline a “Chain Structure Pipeline”.
Joint Performance
Kubota ERDIP has the highest performance rankings for all categories of ISO 16134:2020 Earthquake-resistant and subsidence-resistant design of ductile iron pipelines.
θa : The joint deflection angle is shown in table below
ERDIP is Effective in Natural Hazards other than Earthquakes
Besides its earthquake resistant purpose, ERDIP also performs effectively against ground displacement caused by other disasters such as landslides, subsidence, hurricanes, liquefaction etc. This is why our ERDIP is also known as Hazard Resilient Ductile Iron Pipe (HRDIP).
Road collapse caused by heavy rain; no damage
Road collapse caused by heavy rain; no damage
Road collapse caused by tsunami; no damage
Road collapse caused by tsunami; no damage
Contact
Kubota Membrane USA Corporation, ERDIP Dept, for North America
3528 Torrance Boulevard, Suite 112 Torrance, CA 90503
Tel: +1 424-358-5200
To learn more about Kubota Ductile Iron Pipe click below
DIP (Kubota Global Website)
https://www.kubota.com/products/ironpipe/index.html
ERDIP Movie
https://www.kubota.com/products/ironpipe/movie/
