Gran Tokyo South Tower - Streamlined and optimised

Gran Tokyo South Tower - Streamlined and optimised
Meeting demands
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To save space, the designers of the 205 metre high, 42-storey Gran Tokyo South Tower in central Tokyo wanted to eliminate the second stage relay pumps normally found in high-rise buildings in Japan. But doing this would mean installing pumps that could raise water directly from the basement to the roof, a vertical distance of 240 metres. Could that be done?

Grundfos CRN up to the task
With Grundfos CRN high-pressure vertical multistage pumps it could! The Grundfos solution combined sets of CRN pumps in series, with the second of the two pumps being maximum-specification CRN High Pressure pumps. In truth, with the CRN High Pressure it would be possible to raise water vertically up to a maximum height of 450 meters!

Hydro MPC boosters
The 16 Grundfos CRN series pumps were supplied in sets together with Hydro MPC booster units. As gravity alone was not enough to raise water all the way to the upper floors, the Grundfos Hydro MPC booster was used to increase water pressure. In effect, installing the CRNs and Hydro MPCs on the lower and upper floors of the building allowed the pumping system to function as if it was one large pump unit.

Off the shelf product
An additional factor in selecting the Grundfos pump solution was that Grundfos could deliver a standard, off the shelf package. In many cases, the special requirements for the Gran Tokyo South Tower would require a custom-built pump. However, Grundfos delivered a tried and tested standard solution at a lower cost and, because it is a standard product, the company could also guarantee low maintenance costs.

PHOTO: The Gran Tokyo South Tower

Transforming the Yaesu Exit
The Gran Tokyo South Tower in central Tokyo is changing the face of the JR Tokyo Station Yaesu Exit. Known as the Crystal Tower due to its high-transparency glass facade, Gran Tokyo South Tower is part of a project to better integrate the subway station and the buildings and area around it.

High tech solutions
The tower has a range of streamlined and optimised solutions installed. These include the advanced card control system, which shuts off the air conditioning and lighting inside offices when employees leave the building.

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PHOTO: Grundfos pumps at work in the Gran Tokyo South Tower
Grundfos delivered

Groundbreaking project

For Grundfos Japan, the Gran Tokyo South Tower was a groundbreaking project. As Mr. Chiomitsu Tomidokoro, Grundfos Building Services Product Manager, explains: “Grundfos pumps have been very well received in the industrial world, but in recent years we’ve been putting increasing energy into the construction world as well. I think this was the result of our efforts in this area. We gained a great deal from the project.”

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Delivering energy efficiency
Energy efficiency is an area of ever growing importance in Japan. The latest revisions to Japan’s Act Concerning the Rational Use of Energy require large office buildings to file a report on the amount of energy they use. Installing a Grundfos solution with high-head vertical pumps and automatic regulator demonstrated a major reduction in energy consumption compared to previous systems. As Mr. Tomidokoro, points out, Grundfos has the advanced energy efficient pumping solutions to meet requirements:

”The water volume used in buildings or apartment complexes changes a great deal depending on the conditions and the time. In our case, the data on the special characteristics of the pump are used by the new micro-processor within the unit for simple inverter control and reduced energy consumption. Naturally, this control system was developed in-house at Grundfos.”

Complete order
Having demonstrated that their products could overcome the main technical obstacles, save space and deliver tremendous energy efficiency, Grundfos Japan was rewarded with a complete order for all water-supply equipment for the main part of the water supply system. Grundfos ended up delivering 16 CRN pumps, as well as the Hydro MPC automatic water supply units.

Mr. Tomidokoro sums up: “Grundfos water supply units really have the capability of supplying water to heights of 100 or 200 meters. There are many other advantages as well, and I believe this will become more widely acknowledged, and that we can look forward to even more orders for lifting pumps from our customers in the future.”

PHOTO: Mr. Chiomitsu Tomidokoro, Product Manager, Grundfos


Grundfos water supply units really have the capability of supplying water to heights of 100 or 200 meters. There are many other advantages as well, and I believe this will become more widely acknowledged, and that we can look forward to even more orders for lifting pumps from our customers in the future.

Mr. Chiomitsu Tomidokoro, Product Manager, Grundfos





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