At present, the aluminum alloy materials used in pressure vessels and pipelines of air separation equipment in China are synchronized with those in the world. Northwest Aluminum Co., Ltd. is the earliest domestic company to develop and supply aluminum alloy pipes for the air separation industry. Northwest Aluminum Co., Ltd. is the largest supplier of international air separation giant Linde Engineering Co., Ltd. and Hangzhou Oxygen Concentrator Group Co., Ltd.With an annual production capacity of 3,000 tons of pipes.