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Longmen Co., Ltd., established in 1989 in Taiwan, is a company specializing in industrial gases and various industrial gas services. They focus on services such as high-pressure vessel storage tanks, pipeline planning, design, and responsible engineering construction. They have obtained local government approvals, pressure vessel qualification certificates, long-term maintenance and replacement licenses, and provide long-term supply services for various gases. The founder of Longmen Co., Ltd., Chang Yung Fu, passed the certification examination of the Ministry of Economic Affairs in Taiwan in 1991 and obtained the license as a gas fuel piping technician, qualifying the company as a Class A piping company in Taiwan.
To meet the investment needs of their clients in Vietnam, Longmen Co., Ltd. entered the Vietnamese market in 2001. They provide professional, safe, reliable, and prompt services, including design planning, engineering installation, transportation services, and after-sales services, offering an integrated and comprehensive solution.
To meet the investment needs of their clients in Vietnam, Longmen Co., Ltd. entered the Vietnamese market in 2001. They provide professional, safe, reliable, and prompt services, including design planning, engineering installation, transportation services, and after-sales services, offering an integrated and comprehensive solution.
In 2014, Longmen Co., Ltd. formed a joint venture with Taiwan's San Fu Chemical Co., Ltd. and established "Xiangyun Gas Joint Stock Company" in the Yung An Economic Zone in Thanh Hoa Province, Vietnam. Xiangyun Gas Company is a 100% foreign-owned gas packaging plant that receives and packages gases including oxygen, nitrogen, and argon produced during the production process of the Formosa Ha Tinh Steel Plant. Longmen Co., Ltd. serves approximately 200 clients.
With the increasing severity of global warming, countries worldwide have recognized the importance of energy conservation, carbon reduction, and protecting the planet. Vietnam, as a developing country, has also joined this environmental consensus. In response to international environmental requirements, the Vietnamese government passed stricter environmental, fire safety, and commercial regulations on December 16, 2020. These regulations require factories that use polluting fuels to switch to clean energy fuels such as electricity, natural gas, and liquefied petroleum gas to promote pollution-free industries by July 1, 2021.
The Dragon Gate Company will closely monitor the trends in environmental protection and energy conservation, actively introduce energy-saving and environmentally-friendly technologies, improve production efficiency, and reduce energy consumption and carbon emissions. The company will focus on researching and developing new gas application fields to promote the development of sustainable and environmentally friendly industries.
Before the construction of the factory, Longmen Co., Ltd is currently going through the process of applying for various approval certificates. The factory design includes: an air separation plant, a gas packaging plant, a gas bottling and filling plant, and a cylinder testing plant. The site is located in Binh Duong Province, covering an area of 28,000 square meters. Construction is expected to begin in 2024 and formal production will start in 2025. In addition, Longmen Co., Ltd also plans to expand its business scale in Vietnam, providing more gas supply and engineering after-sales services. The company will continue to cooperate with customers, providing them with high safety standards, high-quality gas products, and professional services to meet customer needs.
Quality Policy
Purity Perfected, Gas Excellence Delivered!

Our company's capacity overview:
Production Capability:We have advanced production facilities and technologies, enabling large-scale production.Our production line equipment and processes are carefully designed and optimized to ensure high efficiency and quality product manufacturing.
Storage Capability:We have modern storage facilities capable of safely storing various gases and liquids.Our storage system complies with national and international standards, with good sealing and safety features, ensuring secure product storage and management.
Distribution Capability:We have a comprehensive distribution network and logistics management system, enabling timely and accurate product delivery to customer locations.We collaborate with reliable transportation partners to ensure on-time product delivery, meeting customer requirements.
Customer Support Capability:We have a professional customer support team that can provide comprehensive technical support and solutions.Our team has rich industry knowledge and experience, able to work with customers to understand and meet their needs.
Our capacity overview aims to ensure that we can address the needs of customers of different scales and requirements. Whether you need large-scale product supply, secure storage facilities, or reliable delivery services, we can provide comprehensive support to meet your business needs.