| TAK FAI SPIRAL PIPE MANUFACTURER LIMITED | Private company limited by shares | Dissolved |
| HARBOUR STAINLESS PIPE MANUFACTURING LIMITED | Private company limited by shares | Dissolved |
| PIPE SUCCESS LIMITED | Private company limited by shares | Dissolved |
| SUNNY OIL PIPE COMPANY LIMITED | Private company limited by shares | Dissolved |
| PIPE & PILING SUPPLIES LIMITED | Private company limited by shares | Dissolved |
| HELSINKI SEAMLESS PIPE SUPPLY CO. LIMITED | Private company limited by shares | Dissolved |
| TAIWAN DONGSENG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SD PIPE TECH LIMITED | Private company limited by shares | Dissolved |
| PIPE TECH LIMITED | Private company limited by shares | Live |
| I PIPE TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| DICKAN PIPE TECHNOLOGIES LIMITED | Private company limited by shares | Dissolved |
| I PIPE TECHNOLOGIES & ENGINEERING LIMITED | Private company limited by shares | Live |
| METROPOLITAN PIPE TECHNOLOGIES LIMITED | Private company limited by shares | Live |
| Germany Adison Pipe Technology Co., Limited | Private company limited by shares | Live |
| Germany Frand Pipe Technology Co., Limited | Private company limited by shares | Live |
| BROFIT PIPE FITTINGS TECHNOLOGY LIMITED | | Live |
| GUANGDONG LANSHENG PIPE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| GERMANY NENUEN PIPE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| SHANGHAI HALEY PIPE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ZHEJIANG BULL PIPE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ZHEJIANG BULL PIPE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| ZHEJIANG QINGFA PIPE TECHNOLOGY LIMITED | | Live |
| THYSSEN PIPE CO., LIMITED | Private company limited by shares | Live |
| PIPE TRADERS INTERNATIONAL LIMITED | Private company limited by shares | Live |
| PEJOTE PIPE AND VALUE CO LIMITED | Private company limited by shares | Dissolved |
| NINGBO FLY VALVE & PIPE CO., LIMITED | Private company limited by shares | Live |
| Germany Vtksi Pipe Group Co., Limited | Private company limited by shares | Live |
| Willmax Pipe Industry Co., Limited | Private company limited by shares | Live |
| WONSON PIPE MANUFACTURING CO., LIMITED | Private company limited by shares | Dissolved |
| WUXI SEAMLESS OIL PIPE CO. LIMITED | Private company limited by shares | Live |
| SHANGHAI XIFENG PIPE MANUFACTURE CO., LIMITED | Private company limited by shares | Live |
| XINRIFENG (SHENZHEN) PIPE MATERIAL LIMITED | Private company limited by shares | Dissolved |
| Xunda Pipe Coating Materials Co., Limited | Private company limited by shares | Live |
| YIDA PIPE TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| YUEFENG YOUJIA PIPE (GERMANY) CO., LIMITED | Private company limited by shares | Live |
| Zhejiang Xinda Plastic Pipe Co Limited | Private company limited by shares | Live |
| SHANGHAI ZHONGDE PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| ZHEJIANG ZHONGYI PIPE. LIMITED | Private company limited by shares | Live |
| ZHEJIANG ZHONGYI PIPE CO., LIMITED | Private company limited by shares | Live |
| Wagner Pipe-Construction HK Co. Limited | Private company limited by shares | Live |
| PIPEFISH CO., LIMITED | Private company limited by shares | Live |
| Hengtong Pipefitting (Hong Kong) Limited | Private company limited by shares | Dissolved |
| Qiangsheng Valve Pipe-Fitting Co., Limited | Private company limited by shares | Live |
| PIPEFOLD LIMITED | Private company limited by shares | Live |
| New Pipeline Limited | Private company limited by shares | Live |
| PIPELINE LIMITED | Private company limited by shares | Live |
| AFRICA PIPELINE COMPANY LIMITED | Private company limited by shares | Live |
| AGRU Pipeline Technology (Hong Kong) Limited | | Live |
| Asian American Pipeline Limited | Private company limited by shares | Live |
| Atlantic Pipeline Limited | Private company limited by shares | Live |
| Cangzhou Yongguan Pipeline Equipment Manufacturing Co., Limited | Private company limited by shares | Dissolved |
| GERMANY CEIDO PIPELINE SYSTEM GMBH LIMITED | | Live |
| Celebrated Pipeline Limited | Private company limited by shares | Live |
| PIPELINE CLOTHING COMPANY LIMITED -THE- | Private company limited by shares | Dissolved |
| FLK PIPELINE CO., LIMITED | Private company limited by shares | Live |
| RIFENG PIPELINE HANGZHOU CO., LIMITED | Private company limited by shares | Live |
| HENGTAI PIPELINE CO., LIMITED | | Live |
| HENGTAI PIPELINE CO., LIMITED | | Live |
| CHINA COMMUNICATION PIPELINE CONSTRUCTION HOLDINGS (HONGKONG) CO., LIMITED | Private company limited by shares | Live |
| Paisen Pipeline Equipment (Hong Kong) Co., Limited | | Live |
| SUZHOU JINNIU PIPELINE (HONG KONG) CO., LIMITED | Private company limited by shares | Live |
| HONG KONG ZHENGDAO OFFSHORE PIPELINE TECHNOLOGY CO., LIMITED | Private company limited by shares | Live |
| VAST IRON PIPELINE CO., LIMITED | Private company limited by shares | Live |
| JINSHENG PIPELINE CO., LIMITED | | Live |
| Oil and Gas Pipeline Engineering Quality Inspection Association Co., Limited | Private company limited by shares | Live |
| MIDDLE EAST PIPELINE TECHNOLOGY & SERVICE CO., LIMITED | Private company limited by shares | Dissolved |
| PIPELINE CONTRACTORS LIMITED | Private company limited by shares | Dissolved |
| DEREK PIPELINE SERVICE COMPANY LIMITED | Private company limited by shares | Live |
| PIPELINE DRAINAGE LIMITED | Private company limited by shares | Live |
| EMPEROR PIPELINE REHABILITATION LIMITED | Private company limited by shares | Live |
| C M PIPELINE ENGINEERING LIMITED | Private company limited by shares | Dissolved |
| USA GENERAL PIPELINE LIMITED | Private company limited by shares | Live |
| GERMANY FURUIDE PIPELINE LIMITED | Private company limited by shares | Live |
| GERMANY JO HLER PIPELINE LIMITED | | Live |
| GERMANY AUX PIPELINE SYSTEM LIMITED | Private company limited by shares | Live |
| GLOBAL PIPELINE RESOURCES LIMITED | Private company limited by shares | Live |
| HANGZHOU (SHUANGLIN GROUP) HAOJIE PIPELINE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI JINNIU ANTIFREEZE GROUP PIPELINE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| Hang On Pipeline Engineering Limited | Private company limited by shares | Live |
| HING YIP PIPELINE SERVICE LIMITED | Private company limited by shares | Live |
| Innovation Pipeline Limited | Private company limited by shares | Dissolved |
| JINNIU PIPELINE LIMITED | Private company limited by shares | Live |
| FUJIAN JIUMU PIPELINE CO., LIMITED | Private company limited by shares | Live |
| Germany Knight Pipeline and Link System (Asia Pacific) Limited | Private company limited by shares | Live |
| PipeLine Machinery Hong Kong, Limited | Private company limited by shares | Live |
| Trans-Asia Pipeline (Hong Kong) Company Limited | Private company limited by shares | Live |
| LEADER TEK PIPELINE ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| MARINE PIPELINE VALVES LIMITED | Private company limited by shares | Live |
| FLK PIPELINE MATERIALS CO., LIMITED | Private company limited by shares | Live |
| MIDAS PIPELINE COMPANY LIMITED | Private company limited by shares | Live |
| Nantong China Resources Natural Gas Pipeline (Hong Kong) Limited | Private company limited by shares | Live |
| GERMANY OSRAM PIPELINE LIMITED | Private company limited by shares | Live |
| CHINA PETROLEUM PIPELINE BUREAU (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| POLY-GCL Pipeline (Hong Kong) Limited | Private company limited by shares | Live |
| Plastic Pipeline Products Limited | Private company limited by shares | Dissolved |
| QINGDAO RIFENG PIPELINE LIMITED | Private company limited by shares | Live |
| SAM PIPELINE REHABILITATION LIMITED | Private company limited by shares | Live |
| HK RIFENG PIPELINE RESEARCH & INVENTION LIMITED | Private company limited by shares | Dissolved |
| RIFENG NEW PIPELINE LIMITED | Private company limited by shares | Dissolved |
| PIERSA Pipeline (Shanghai) Co., Limited | | Live |