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Hebei Delong Environmental Engineering Co., Ltd. is a high-tech enterprise specializing in industrial environmental protection and governance. Leveraging the in-depth industry scenarios and engineering practices of Delong Iron and Steel Group in the iron and steel sector, the company is dedicated to providing systematic environmental engineering services to energy-intensive industries such as iron and steel, coking, and power generation. Its core business covers flue gas desulfurization and denitrification, VOCs (volatile organic compounds) control, ultra-low emission retrofitting for dust removal, zero-discharge wastewater treatment, and resource utilization of solid waste, forming an integrated capability spanning “technology R&D—equipment integration—EPC general contracting—operation & maintenance services.” The company holds Grade I qualification for environmental engineering professional contracting, Grade I qualification for pollution control facility operation and service (atmospheric), and Grade III qualification for general contracting of construction engineering; it has also obtained certification for the three major management systems: ISO 9001, ISO 14001, and ISO 45001. It operates the “Hebei Provincial Technology Innovation Center for Collaborative Control of Multiple Pollutants in Industrial Flue Gas,” recognized by the Hebei Provincial Department of Science and Technology, and has secured over 60 authorized patents, including 12 invention patents. Its technological achievements have been successfully applied in projects such as the integrated active coke-based flue gas desulfurization and denitrification project for the two 360 m² sintering machines at Xingtai Delong Iron and Steel Co., Ltd. (a key provincial environmental demonstration project in Hebei Province) and ultra-low emission retrofits for in-house production lines at Tianjin New Tian Steel United Special Steel Co., Ltd., achieving stable operation with particulate matter emissions <5 mg/m³, SO₂ <20 mg/m³, and NOx <40 mg/m³ at sintering machine exhaust stacks. The company participated in drafting two group standards, including the “Technical Specification for Flue Gas Denitrification Engineering in Iron and Steel Enterprises” (T/CCSAS 013-2022). In 2023, it was selected as a Hebei Province “Specialized, Refined, Distinctive, and Innovative” (Zhuan Jing Te Xin) small and medium-sized enterprise; in 2024, it passed the national high-tech enterprise re-examination. Currently, its service coverage includes Hebei, Shandong, Jiangsu, Inner Mongolia, and other regions. It has launched third-party environmental protection entrusted operation services, with collaboration directions encompassing EPC general contracting, specialized operation & maintenance entrustment, integrated technology and equipment supply, and full-lifecycle solutions for environmental protection upgrades and retrofits.

Hangzhou Linchuang Construction Co., Ltd. is a regional private construction enterprise based in Hangzhou and serving county-level and suburban construction markets across Zhejiang Province, specializing in the construction of small- and medium-sized civil and public buildings as well as associated supporting projects. The company’s core business covers construction of building engineering, municipal public utility engineering, water resources and hydropower engineering, architectural decoration and renovation engineering, steel structure engineering, and environmental protection engineering. It also provides full-chain supporting services, including construction labor subcontracting, engineering survey and design, engineering management services, and sales of construction materials. Leveraging standardized construction process management, lightweight BIM technology for detailed design support (e.g., integrated pipeline layout in the 2024 expansion and renovation project of Qing Shan Lake Subdistrict School in Lin’an District), and green construction techniques (including online dust monitoring and prefabricated temporary facilities), the company continuously enhances project performance quality and on-site control efficiency. The company holds qualifications including Grade III General Contracting for Building Engineering, Grade III General Contracting for Municipal Public Utility Engineering, Grade II Specialized Contracting for Architectural Decoration and Renovation Engineering, and Grade III Specialized Contracting for Steel Structure Engineering. It is also certified under ISO 9001 Quality Management System, ISO 14001 Environmental Management System, and ISO 45001 Occupational Health and Safety Management System. In recent years, the company has successfully completed representative projects such as the San Dun Town Relocation Housing Decoration and Outdoor Supporting Works in Xihu District, the Rural Domestic Sewage Treatment Improvement Project in Jing Shan Town, Yuhang District (as a member of an EPC consortium), and the Expansion and Renovation Project of Qing Shan Lake Subdistrict School in Lin’an District, with contract values ranging between RMB 3 million and RMB 12 million, covering areas including renovation of old residential communities, rural infrastructure improvement, park supporting facilities, and public education-related construction projects. Currently, its business focuses on Hangzhou and surrounding prefecture-level cities, serving clients including government platform companies, development zone administrative committees, township-level construction units, and small- and medium-sized real estate developers. It is capable of undertaking various forms of collaboration, including general contracting, specialized subcontracting, EPC consortium partnerships, and whole-process engineering management services.

PipeChina (Fujian) Emergency Maintenance Co., Ltd. is a Level-3 subsidiary wholly owned by China National Petroleum and Natural Gas Pipeline Network Group Co., Ltd., a central state-owned enterprise. The company is registered in Fuzhou City, Fujian Province, was established on December 24, 2021, and has a registered capital of RMB 50 million. It is positioned as the core force of the oil and gas long-distance pipeline safety operation assurance system along the southeast coast of China, focusing on emergency response, rapid repair, risk prevention and control, and intelligent operation & maintenance support. Its core business covers 24-hour emergency response to incidents involving long-distance pipelines transporting natural gas, refined oil, and other media—including sudden leaks, geological disaster damage, and third-party damage—providing end-to-end technical services such as on-site plugging, pipe section replacement, non-destructive testing (NDT) of weld joints (including X-ray digital radiography [DR]), corrosion repair, and post-disaster assessment. The company also undertakes responsibilities including coordinated monitoring and early-warning for high-consequence areas, standardized support for maintenance and repair operations, and operation & maintenance of the emergency resource dispatch platform. Its technical capabilities are built upon the “Pipeline Integrity Management Platform” and the “National Oil & Gas Pipeline Emergency Command Center” of China National Pipeline Network Group, enabling GIS + IoT real-time operational condition monitoring, digital twin–assisted decision-making, and application of fully automated hydraulic plugging equipment. The company has obtained the “Special Equipment Installation, Modification, and Repair License” (for pressure pipelines), the “Construction Enterprise Qualification Certificate” (Level-3 qualification for petrochemical engineering), and the “Work Safety Production License”, and has passed certification under the three major management systems: ISO 9001, ISO 14001, and ISO 45001. It has participated in emergency drills for geological disasters during the flood season on the Fujian-Guangdong Branch Line and joint field-response operations addressing third-party construction damage on the East Section of the West-East Gas Pipeline Phase III. It has completed multiple urgent repairs on the Fuzhou–Sanming natural gas branch pipeline. Its service coverage spans the entire Fujian Province and extends to cross-provincial emergency coordination and support with neighboring provinces including Zhejiang, Guangdong, and Jiangxi. It delivers professionalized, standardized, and interoperable pipeline emergency technical services and regional collaborative prevention-and-control solutions to owners of energy infrastructure, local government emergency management departments, and industry partners.

Dandong Longyu Construction Engineering Co., Ltd. was established in December 2009, with its registered address located in Yuanbao District, Dandong City, Liaoning Province. It is an ongoing regional medium- and small-sized private construction enterprise, with a registered capital of RMB 10 million and Chi Xuechun as its legal representative. The company focuses on residential building construction and municipal engineering, and its core businesses include: housing construction projects, municipal public utility projects, highway projects, water conservancy and hydropower projects, architectural decoration and renovation projects, steel structure projects, foundation and substructure projects, and fire protection facility installation projects. Additionally, it provides construction labor subcontracting services, as well as sales of construction materials and decorative materials. Holding Grade III General Contracting Qualifications for Building Construction and Municipal Public Utility Construction, the company is qualified to undertake various housing construction projects with individual contract values not exceeding RMB 30 million, and municipal public utility projects with individual contract values not exceeding RMB 60 million. It holds a valid Work Safety Production License (License No.: Liao JZ An Xu Zheng Zi [2019] 060302), effective until June 2026. The number of employees covered by social insurance remains stable between 15 and 22. Its 2024 tax credit rating is Grade B. The company’s business operations primarily cover Dandong and surrounding counties, undertaking public construction projects such as medium and small sized public buildings, urban infrastructure supporting facilities, and renovation of existing buildings, with practical emphasis placed on general contracting and specialized subcontracting implementation. It engages in pragmatic cooperation, including project construction, labor subcontracting, material supply, and engineering support services, with local government platforms, development entities, design institutes, and upstream and downstream suppliers.

Dalian Ziming Coatings Co., Ltd. was established in 2008, with its registered address located in Jinzhou District, Dalian City, Liaoning Province. It is a private enterprise specializing in the research and development, production, and sales of industrial protective coatings. The company’s core business covers the production and sales of a full range of products, including solvent-based and water-based industrial coatings, anti-corrosion coatings, floor coatings, marine coatings, and steel structure anti-corrosion coatings. Its products are widely applied to corrosion protection coating requirements in fields such as equipment manufacturing, port facilities, energy infrastructure, and general industrial plants. The enterprise possesses stable independent R&D and production capabilities, strictly adheres to national standards such as GB/T 38597-2020 “Technical Requirements for Low Volatile Organic Compound Content Coating Products,” and has obtained ISO 9001:2015 Quality Management System Certification (Certificate No.: 00122Q31234R1M, valid until October 2025). Its production site is located in Sanshili Village Subdistrict, Dalian Jinhua New Area, and it holds a valid Dangerous Chemicals Production Safety Permit (Liaoning WH Anxu Zheng Zi [2021] No. 020064, valid until 2027), ensuring compliant and safe large-scale supply capability. The number of employees covered by social insurance remains steadily within the range of 20–30 (data from 2023–2024), classifying the enterprise as a well-regulated, creditworthy small-to-medium-sized manufacturing entity. Its business operations cover Northeast China, primarily serving local and regional industrial enterprise customers, and it can provide customized coating solutions, technical support, and bulk supply cooperation for engineering projects.

Dalian Zhongmin Ronghe Gas Co., Ltd. was established in December 2018. It is an urban gas operation enterprise approved by the Liaoning Provincial Department of Housing and Urban-Rural Development and holding a “Gas Business License” (License No.: Liao Ran Jing Zheng Zi [2021] No. 027). The company was jointly funded by Zhongmin Gas (Shenzhen) Co., Ltd. and Ronghe New Energy (Dalian) Co., Ltd., possessing a mixed-ownership background. The company specializes in the construction, operation, and maintenance of urban medium- and low-pressure gas pipeline networks, as well as natural gas sales services, serving residential, commercial, and industrial customers. Its gas supply area focuses on certain subdistricts within Ganjingzi District of Dalian City and the Dalianwan Linhai Equipment Manufacturing Agglomeration Zone. Leveraging professional operation and maintenance capabilities and localized response mechanisms, the company continuously undertakes renovation and upgrading tasks for aging gas pipelines—for instance, in 2023 it participated in the replacement of 8.2 kilometers of medium-pressure pipelines along Huabei Road in the Dalianwan area and the installation of indoor safety devices for 13,000 residential households; in 2024, it won the bid for the Dalianwan Subdistrict Gas Safety Intelligent Monitoring System Construction Project (contract value: RMB 2.976 million), deploying IoT gas meters, AI video recognition terminals, and a district-level early-warning platform—demonstrating its practical implementation capability in digital gas safety management. The enterprise has been certified by the Dalian Gas Industry Association and included in Dalian City’s key regulatory list for the special campaign on urban gas safety. In 2023, its tax payment amounted to approximately RMB 1.86 million, and it enrolled 12 employees in social insurance. Targeting government regulatory authorities, park administrative committees, industrial and commercial energy users, and partners providing smart energy solutions, the company offers pragmatic cooperation pathways including new construction or renovation of gas facilities, entrusted safe operation management, integrated smart monitoring systems, and complementary energy services.

Dalian Changxing Tiancheng Gas Co., Ltd. was established in 2003. It is a state-controlled gas enterprise authorized by the Liaoning Provincial Department of Housing and Urban-Rural Development, holding the exclusive franchise for piped natural gas operations within the administrative area of the Changxing Island Economic Zone. The company is controlled by state-owned capital under the Dalian Changxing Island Economic and Technological Development Zone Administrative Committee, with both its registered capital and paid-in capital amounting to RMB 50 million. Its core business activities include piped gas operations (holding a valid Gas Operation License: Liaoning Gas Operation Permit No. [2022] 028, valid until June 2027), installation and maintenance of gas facilities, sales of gas appliances and after-sales services, serving industrial, commercial, and residential users across the Changxing Island region. Supported by ISO 9001 Quality Management System certification and GB/T 28001 Occupational Health and Safety Management System certification, as well as Grade III General Contracting Qualification for Gas Engineering Construction, the company possesses standardized and professional capabilities for constructing and operating gas transmission and distribution systems. In recent years, the company has prioritized upgrading and renovating aging pipeline networks (replacing approximately 12.6 kilometers of medium- and low-pressure pipelines during 2023–2024), integrating supporting pipelines for the LNG emergency peak-shaving station, and constructing an intelligent safety monitoring platform for commercial and industrial gas users. Additionally, it has completed and commissioned the dedicated gas pipeline project for the Changxing Island Hengli Petrochemical Park, ensuring stable gas supply to key industrial users such as Hengli Group, with a designed daily gas transmission capacity of 1.2 million cubic meters. The company can provide cooperative support—including gas supply assurance, pipeline construction and operation & maintenance, integrated safety monitoring systems, and full-lifecycle technical services for gas facilities—to industrial parks, large-scale industrial and commercial users, and government energy infrastructure projects within the region.

Dalian Yuzhou Ship Engineering Co., Ltd., located in Ganjingzi District, Dalian City, Liaoning Province, is a high-tech enterprise specializing in the research and development, design, manufacturing, and technical services of supporting equipment for ships and offshore engineering. It belongs to the industry category “Railway, Ship, Aerospace, and Other Transportation Equipment Manufacturing” and is currently in a stable operational phase with ongoing technological deepening and advancement. The company’s registered capital is RMB 10 million, fully paid in.

The company’s core business focuses on high-value-added marine metal pipe fittings and modular outfitting units. Its products are widely applied across bulk carriers, container ships, and nearshore wind turbine installation vessels. In chemical engineering-related scenarios, its key components—including stainless steel flanges, carbon steel reducers, and marine piping sealing connection structures—are compatible with process piping systems and modular integration requirements for petrochemical, coal chemical, and offshore energy platforms.

The enterprise possesses independently controllable specialized stainless steel processing capabilities. Leveraging Germany’s BLM EcoBend 65 fully automatic CNC tube bending production line and its own heat treatment furnace cluster, it achieves precision cold-forming control with wall thickness reduction ≤8% and roundness error ≤0.3 mm. The company holds two authorized invention patents (including a manufacturing process for seawater-corrosion-resistant duplex stainless steel flanges and a rapid-sealing marine piping connection structure) and eleven utility model patents, all in valid legal status.

The company has obtained the China Classification Society (CCS) “Factory Approval Certificate” (No. CCS-FR-2021-0892), covering twelve categories of marine metal structural components, including ship piping accessories. It has also passed ISO 9001:2015 Quality Management System Certification (Certificate No.: 02222Q30285R1M, valid until January 21, 2027).

From 2023 to 2025, the company has consecutively supplied stainless steel piping system components (DN300–DN1200) to COSCO Shipping Kawasaki Dalian for three years, with total contract value exceeding RMB 68 million. In 2024, it delivered 176 customized eccentric tees modules for 22,000 TEU ultra-large container ships to China Merchants Heavy Industry (Jiangsu).

All its business operations are concentrated within the Bohai Rim shipbuilding cluster. Its customer base includes leading domestic shipbuilders such as COSCO Shipping Kawasaki, Dalian Shipbuilding Industry Company (DSIC), and Bohai Shipbuilding Heavy Industry Co., Ltd. Currently, its primary cooperative pathway centers on serving the domestic high-end shipbuilding and offshore engineering supporting markets.

Dalian Tengdayun Building Decoration Engineering Co., Ltd. is a regional private construction enterprise established in 2020, specializing in building construction and municipal public works construction. Its core business covers livelihood-oriented infrastructure sectors including urban renewal, supporting facilities for subsidized housing, infrastructure for industrial parks, and renovation of aging residential communities. Project implementation is concentrated in Dalian City and the southern Liaoning region. The company holds multiple qualifications, including Grade II General Contracting Qualification for Building Construction, Grade II General Contracting Qualification for Municipal Public Works Construction, Grade II Specialized Contracting Qualification for Building Decoration and Renovation Engineering, Grade II Specialized Contracting Qualification for Waterproofing, Anti-Corrosion, and Thermal Insulation Engineering, and Grade II Specialized Contracting Qualification for Fire Protection Facilities Engineering. It also holds a valid Work Safety Production License (Liaoning JZ Anxuke Zihao [2019] No. 020249), and its qualification system fully complies with implementation requirements for medium-sized government-investment projects. Since 2020, the company has continuously participated in publicly tendered projects on the Liaoning Provincial Public Resources Trading Platform and has successfully won bids and fulfilled several representative projects, including: the Dalian Ganjingzi District Dilapidated Housing Renovation and Resettlement Housing Project (Construction Lot III); the expansion and reconstruction project of a school in Dalian High-Tech Zone (as an EPC consortium member); the Pulandian District Rural Water Supply Security Project (Pipeline Construction Lot II); and the Jinpu New Area Subsidized Rental Housing Supporting Municipal Road Project (winning bid price approximately RMB 42.6 million). Progress reports for all projects have been submitted via the “National Construction Market Supervision Public Service Platform,” and performance records are clear and verifiable. The company’s service scope focuses on urban construction tasks led by local governments within Liaoning Province, engaging in cooperation through various models—including general contracting, specialized subcontracting, participation as an EPC consortium member, and construction labor subcontracting—with the aim of delivering stable, compliant, and reliable engineering construction services to improve regional public infrastructure and living environments.

Dalian Xueshan Refrigeration Equipment Manufacturing Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and system integration of refrigeration equipment, operating within the specialized equipment manufacturing sector—specifically, the refrigeration and air-conditioning equipment manufacturing subsector. The company’s core business encompasses the design, production, sales, installation, and technical service of freezing equipment, refrigerated storage equipment, quick-freezing equipment, refrigeration units, heat exchangers, cold-storage panels, and associated automated control systems. Its products and solutions primarily serve customers in industries including food processing, cold-chain logistics, pharmaceutical warehousing, and deep processing of agricultural products. Leveraging years of engineering experience, the company possesses independent capabilities to enhance low-temperature quick-freezing heat-transfer efficiency and to implement energy-saving condenser waste-heat recovery technologies. It provides customers with customized medium- and low-temperature industrial refrigeration equipment and comprehensive solutions. Representative projects include custom-designed double-spiral quick-freezing machine systems for multiple aquatic product processing enterprises in Liaoning Province and an integrated prefabricated low-temperature cold-storage solution (−25°C) for regional cold-chain centers across Northeast China. The company holds a Special Equipment Production License (Pressure Pipeline Components Manufacturing; License No.: TS2721087-2027), possesses Grade III professional contracting qualification for electromechanical equipment installation projects (valid until 2026), and has obtained ISO 9001:2015 Quality Management System Certification (Certificate No.: 00122Q31234R1M; valid until November 2025); its Environmental Management System and Occupational Health and Safety Management System remain continuously effective. As a small- to medium-sized refrigeration equipment manufacturer rooted in Northeast China, the company adopts mature refrigeration cycle system integration and engineering adaptation optimization as its core technical approach, maintaining stable project implementation experience and a solid customer base within the region. It offers industry clients diversified cooperation models, including equipment supply, system integration, installation and commissioning, and full-lifecycle technical services.