| 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 |
| SHANGHAI JINNIU PIPELINE LIMITED | Private company limited by shares | Live |
| SHANGHAI PIERSA PIPELINE PLASTIC LIMITED | Private company limited by shares | Live |
| SHANGHAI PILSA PIPELINE LIMITED | Private company limited by shares | Live |
| SHANGHAI RIFENG PIPELINE LIMITED | Private company limited by shares | Live |
| SHANGHAI HUAYA PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SHANGHAI JINNIU PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| SHANGHAI RIFENG TECHNOLOGY PIPELINE LIMITED | Private company limited by shares | Live |
| SHANGHAI JINNIU NEW TYPE PIPELINE LIMITED | Private company limited by shares | Live |
| Pipeline Solutions Limited | Private company limited by shares | Live |
| TALENT PIPELINE ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Pipeline Technologies Limited | Private company limited by shares | Live |
| IP PIPELINE TECHNOLOGY LIMITED | | Live |
| UK BOKWELL PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| EXCELLENT PIPELINE TECHNOLOGY & ENGINEERING LIMITED | Private company limited by shares | Live |
| HK JINNIU NEW PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| HK JIUMU PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| MAGPLANE PIPELINE TECHNOLOGY IM LIMITED | Private company limited by shares | Live |
| QINGDAO RIFENG PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| JINNIU SUYE PIPELINE TECHNOLOGY LIMITED | Private company limited by shares | Live |
| Pipeline Tool & Die Limited | Private company limited by shares | Live |
| Pipeline Tooling Limited | Private company limited by shares | Live |
| Pipeline Trading Limited | Private company limited by shares | Dissolved |
| WISESON PIPELINE ENGINEERING LIMITED | Private company limited by shares | Live |
| OIL & GAS PIPELINES LIMITED | Private company limited by shares | Live |
| GUANGDONG RICHFUL PIPELINES LIMITED | Private company limited by shares | Dissolved |
| CHINA PIPELINES TECHNOLOGY NETWORK COMPANY LIMITED | Private company limited by shares | Live |
| PIPEMART PTE LIMITED | Private company limited by shares | Live |
| PIPER INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| PIPER POINT LIMITED | Private company limited by shares | Dissolved |
| Piper Technologie Limited | Private company limited by shares | Live |
| Piper Trading Limited | Private company limited by shares | Live |
| PIPERNO COMPANY LIMITED | Private company limited by shares | Dissolved |
| PIPERSON LIMITED | Private company limited by shares | Dissolved |
| Pipersong Limited | | Live |
| PIPERSPOOL LIMITED | Private company limited by shares | Dissolved |
| TAI KEE PIPES LIMITED | Private company limited by shares | Live |
| P S P PIPES LIMITED | Private company limited by shares | Dissolved |
| HK NEW CENTURY PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| MAN CHIT PIPES LIMITED | Private company limited by shares | Live |
| kirin pipes co., Limited | | Live |
| XINXING DUCTILE IRON PIPES CO., LIMITED | | Live |
| EAST ASIA PLASTIC PIPES CO., LIMITED | Private company limited by shares | Live |
| Eternal Pipes Limited | Private company limited by shares | Live |
| FU NGAI PIPES FACTORY LIMITED | Private company limited by shares | Dissolved |
| HK BOSS PVC PIPES & FITTINGS MANUFACTORY LIMITED | Private company limited by shares | Dissolved |
| INTERPACIFIC OIL PIPES LIMITED | Private company limited by shares | Live |
| HK JIULONG RIFENG PIPES COMPANY LIMITED | Private company limited by shares | Live |
| ZHEJIANG KINGFUN PIPES LIMITED | Private company limited by shares | Dissolved |
| Pipes in C Major Limited | Private company limited by shares | Dissolved |
| MARBLE PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| WAH TAI PIPES AND MATERIAL COMPANY LIMITED | Private company limited by shares | Dissolved |
| PACIFIC PIPES LIMITED | Private company limited by shares | Dissolved |
| PLASTIC PIPES LIMITED | Private company limited by shares | Live |
| GIO NGAI PIPES PRODUCT LIMITED | Private company limited by shares | Live |
| SHANGHAI AIJIE PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI AIDEKANG PIPES INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI DIFEILE PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI FIRST GROUP PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI HENGTONG PIPES LIMITED | Private company limited by shares | Live |
| SHANGHAI HENGYU PIPES LIMITED | Private company limited by shares | Live |
| SHANGHAI HUATAI PLASTIC PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI RUIJIE PIPES INDUSTRY LIMITED | | Live |
| SHANGHAI JIANNENG PIPES LIMITED | Private company limited by shares | Live |
| SHANGHAI JINCHENG PIPES COMPANY LIMITED | Private company limited by shares | Live |
| SHANGHAI JINCHI RIFENG PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI JINGBA PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI JINYOU PIPES COMPANY LIMITED | Private company limited by shares | Live |
| SHANGHAI KANGQIAO PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI LIANSHUI PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI QIKAI PLASTIC PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI RIFENG PIPES LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI YINGFEITE PIPES TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI WANTONG PIPES LIMITED | Private company limited by shares | Dissolved |
| HK SHUANGNIU PIPES COMPANY LIMITED | Private company limited by shares | Dissolved |
| PipeScan AI Limited | | Live |
| PIPEWORK OIL INVESTMENT LIMITED | Private company limited by shares | Dissolved |
| ERP Pipeworks Limited | Private company limited by shares | Live |
| WAI YIP MARINE PIPEWORKS LIMITED | Private company limited by shares | Dissolved |
| PIPEWORKS TECHNOLOGY LIMITED | Private company limited by shares | Dissolved |
| PIPEX SYSTEMS LIMITED | Private company limited by shares | Dissolved |
| HK PIPIBA FINERY CO., LIMITED | Private company limited by shares | Dissolved |
| Pipibay.com Limited | Private company limited by shares | Live |
| Korea Pipiduck Co., Limited | Private company limited by shares | Live |