Hazard Resilient Ductile Iron Pipe(HRDIP)
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 Hazard Resilient Ductile Iron Pipe(HRDIP).
Kubota’s HRDIP 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 HRDIP is used by so many Japanese water agencies today.
Since its introduction the volume of HRDIP produced by Kubota has increased steadily with marked growth beginning after the 1995 Kobe earthquake. HRDIP 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 HRDIP pipe being installed so far. That’s enough to go around the world one and half times! We have also started to see HRDIP being adopted by municipalities in the U.S. and Canada including Los Angeles, San Francisco, Seattle, Portland, Layton and Vancouver.
Los Angeles County Installation
Santa Clara Valley Installation
We are confident that our unique HRDIP product will help improve the resiliency and reliability of our owners’ water supply for years to come.
Concept
The HRDIP absorbs the large ground displacement by joint expansion/contraction, deflection, and anti-pull out structure. When one joint is fully expanded, 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 HRDIP 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
Re-branding from ERDIP to HRDIP
Kubota has invented HRDIP as ERDIP(Earthquake Resistant Ductile Iron Pipe) at first. After that, we realize that ERDIP also performs effectively against ground displacement caused by other disasters such as landslides, subsidence, hurricanes, and liquefaction, as well as many others. This is why now we call our unique pipe "HRDIP", provided with same quality and same superior performance of ERDIP.
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 Water and Environment U.S.A. Corporation, HRDIP 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
HRDIP Movie
https://www.kubota.com/products/ironpipe/movie/
