Yebisu Garden Place Tower 22nd Floor
20-3, Ebisu 4-Chome, Shibuya-ku, Tokyo 150-6022, Japan
Phone: +81-3-3443-3717Fax: +81-3-3443-3263
URL: https://www.nikkiso.com

October 4th, 2023

Success
in performance testing of a liquefied hydrogen pumpPressInformationfor hydrogen aircraft

The first case of the high speed operation with submersible condition in the world
Nikkiso Co., Ltd. (Head Office: Shibuya-ku, Tokyo, hereinafter called "Nikkiso") has successfullyconducted the performance testing of the pump with liquefied hydrogen for hydrogen aircraft. This is thefirst case in the world that a motor-integrated pump unit succeeded in delivering liquified hydrogen byrealizing high-speed rotation with small electric motor in a cryogenic condition (submered condition)
filled with liquefied hydrogen (-253°C). Nikkiso has been commissioned to develop a liquefied hydrogen
pump by Kawasaki Heavy Industries, Ltd. (Head Office: Kobe City, Hyogo Prefecture, hereinafterreferred to as "Kawasaki Heavy Industries"), which is engaged in research and development forhydrogen aircraft. Nikkiso aims to achieve deliver the pump in fiscal 2025.

■ BackgroundHydrogen aircraft uses liquefied hydrogen for fuel, which does not emit carbon dioxide during
combustion. They are seen as a likely candidate for the next generation of aircraft, as a measure fordecarbonization in the aviation sector. Liquefied hydrogen is used as the fuel because liquification
makes it possible to compress the volume down to 1/800 the volume that of the gas state.
Kawasaki Heavy Industries proposed the "Development of core technologies for hydrogen aircraft" forthe Green Innovation Fund Projects of the New Energy and Industrial Technology Development
Organization (NEDO), and the proposal was adopted in November 2021. Nikkiso has beencommissioned by Kawasaki Heavy Industries to perform the development of a liquefied hydrogenpump.

■ Characteristics of the liquefied hydrogen pump
The liquefied hydrogen pump being developed by Nikkiso is a booster pump to further pressurize anddeliver liquefied hydrogen from a fuel tank to an engine pump. Aircraft pumps are required to be small
and lightweight, and also hydrogen is low in density and difficult to boost, so Nikkiso developed anelectric motor that rotates at a higher speed than conventional pump designs, to aim to ensure thenecessary pressure and flow rate.
When a pump is made of materials with different thermal shrinkage rates, high technical capability isrequired to rotate the pump at high speeds with cryogenic liquefied hydrogen. However, Nikkiso has
extensive experience in the manufacturing of special industrial pumps for cryogenic fluids such as LNG(-163°C). The know-how gained from these experiences are being utilized to design and develop
motors that can rotate at high speeds even when they are at cryogenic temperatures, bearings that canwithstand the high-speed rotation, and highly efficient pumps.
■ Results of experiment and future development
The experiment was conducted at JAXA Kakuda Space Center in Kakuda City, Miyagi Prefectu
re, in June and good results were observed as designed. The results obtained from the experi
ments now are being analyzed and the prototype will be improved to aim for a further small
and lightweight and for a longer lifespan. Nikkiso will contribute to the realization of a decarbo
nized society through research and development to create liquefied hydrogen pumps for hydrog
en aircraft.

<About Nikkiso>
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NIKKISO CO., LTD.
Yebisu Garden Place Tower 22nd Floor, 20-3, Ebisu 4-Chome,Shibuya-ku, Tokyo 150-6022, Japan
December 26, 1953
Toshihiko Kai
Nikkiso provides specialized pumps and systems in the Industrial
Business, CFRP (carbon fiber reinforced plastic) aircraft parts in theAerospace Business and hemodialysis, and healthcare related productsin the Medical Business.
https://www.nikkiso.com/

For inquires, please contact:
PR and IR Section, Corporate Planning Department,
Corporate Planning Division, NIKKISO CO., LTD.
E-mail: nikkiso-pr@nikkiso.co.jp