Depamu Industrial Pumps: Powering the Oil & Gas, Petrochemical, and Heavy Industry Sectors
Introduction
In the complex and demanding world of fluid transfer, industrial pumps serve as the beating heart of modern industry. From the extraction of crude oil in remote offshore fields to the precise injection of chemical additives in refinery operations, pumps are indispensable to the global energy and materials supply chain. Among the companies shaping this critical landscape, Depamu (Hangzhou) Pumps Technology Co., Ltd. has emerged as a formidable force, delivering high-performance pumping solutions across the oil and gas, petrochemical, and heavy industry sectors.
Founded in 2003 and headquartered in Hangzhou Qiantang Area, China, Depamu is a high-tech enterprise specializing in the research, development, production, and sales of a comprehensive portfolio of fluid transfer equipment. The company's product range includes Metering Pumps (plunger, mechanical diaphragm, and hydraulic diaphragm types), high-pressure process Reciprocating Pumps (plunger, diaphragm, and hose types), electric and pneumatic Diaphragm Pumps, Screw Pumps, Rotor Pumps, anti-corrosion centrifugal pumps, cryogenic pumps, chemical dosing packages, water-steam sampling devices, supercritical fluid equipment, and water-treatment equipment. This breadth of offerings positions Depamu as a one-stop solution provider for industries where precision, reliability, and safety are non-negotiable.
Company Profile and Technological Foundation
Depamu's journey began with a strategic decision to introduce advanced technology from Germany, focusing on the development of fluid transfer equipment. Over the past two decades, the company has accumulated more than 100 technical patents, including 38 invention patents, and has established itself as a drafter of pump industry standards. The company has obtained API, CE, ISO 9001, ISO 14001, and ISO 45001 certifications, underscoring its commitment to international quality, environmental, and occupational health and safety standards.
Depamu's manufacturing capabilities are supported by two subsidiaries: Keniluowa (Hangzhou) Industrial Equipment Co., Ltd., which specializes in high-end screw pumps (single, double, and triple), rotor pumps (metal and rubber), and gear pumps; and Dailiepu (Hangzhou) Fluid Control Technology Co., Ltd., which produces high-end centrifugal pump series products. Together, these entities form an integrated ecosystem capable of addressing virtually any fluid transfer challenge.
The company's products have been widely applied to oil and gas field exploitation, petroleum and gas refining and transportation, as well as industries including nuclear power, military projects, chemical, electricity, pulp and paper, pharmacy, food, new energy, environmental protection, and water treatment. Depamu has established long-term strategic partnerships with major enterprises such as CNPC, SINOPEC, CNOOC, and CNNC, and its products have been exported to over 60 countries and regions including the United States, the United Kingdom, and France.
Product Portfolio for Critical Applications
High-Pressure Process Reciprocating Pumps
At the core of Depamu's offerings for heavy industry are its high-pressure process reciprocating pumps, designed in accordance with the American Petroleum Institute standard API 674. These pumps represent quality at a globally leading level, capable of meeting extremely severe working conditions while transporting materials accurately and reliably. The HD series of High-Pressure Reciprocating Pumps is particularly noteworthy, with products such as the HD3E(M), HD3M(M), HD3N(M), and HD5J(M) models offering flow ranges from 0.76 to 94.61 m³/h and pressure ranges from 2.5 to 160.3 MPa.
These pumps are engineered with a compact modular structure, small size, and light weight. They feature good lubricity, a small friction coefficient, and high efficiency, with stable and reliable transmission at the drive end characterized by low noise. Available in horizontal, vertical, stationary, and mobile configurations, they can be powered by motor, diesel engine, or solar energy. The deceleration mechanism options include double helical gear, worm and gear, reducer, and belt pulley. Importantly, the wetted parts can be manufactured from alloy steel, stainless steel, dual-phase steel, titanium, and Hastelloy, allowing for customized solutions that meet specific corrosion and temperature requirements.
The design of Depamu's process diaphragm pumps ensures no leakage during the transportation of toxic, flammable, or abrasive media, making them especially suitable for handling hazardous substances without restriction from different fields. This feature is particularly critical in petrochemical operations where safety and environmental protection are paramount concerns.
Metering Pumps for Precision Dosing
In the petrochemical and chemical industries, precise dosing of additives, inhibitors, and other chemicals is essential for process control, product quality, and safety. Depamu's metering pumps address this need with exceptional accuracy. The DP(M)WA Hydraulic Diaphragm Metering Pump, for example, offers a flow rate adjustment range of 10%–100% with a metering accuracy of ±0.5%. This level of precision is achieved through a patented integrated sleeve adjustable eccentric transmission mechanism, which allows for stepless adjustment of stroke within the range of 0%–100%.
The DP(M)ZA reciprocating metering pump features a plunger that contacts the fluid directly, with the volume of the working chamber changing cyclically as the plunger reciprocates. This design, combined with high-precision inlet and outlet check valves, ensures metering accuracy and fluidity. The pump can accommodate single pump head flow rates up to 12,100 L/h and pressures up to 228 MPa, making it suitable for high-viscosity, high-pressure process flows. Multiple pump heads (up to 12) can be connected in parallel to transport the same fluid with reduced pulsation or to transport multiple media as a proportional pump.
The DP-Series 2DPMFXAA Mechanical Diaphragm Metering Pump represents another important product line, offering a maximum flow rate per head of 3,200 L/h and a turndown ratio of 10:1 with steady-state accuracy of ±2%. Its two-cylinder design is applicable to fluid transfer in extra-large flow with more smooth and stable change in flow rate with little pulsation through the inlet and outlet manifold.
Hose Diaphragm Pumps for Abrasive and Viscous Media
For the most challenging applications involving highly viscous fluids with particles, Depamu's high-pressure process hose pumps offer a unique solution. Designed as per API 674, these pumps feature a hose diaphragm that separates the fluid from the pump head, eliminating wear and leakage. The pump can handle fluids with a solid content up to 80%, a pressure within 0.34–0.5 MPa, and a temperature within 120°C, making it ideal for coal water slurry transfer, one-pulp handling, and kitchen waste disposal.
The operating principle is based on the reciprocating motion of a piston that pushes hydraulic oil, which in turn acts on the hose diaphragm. The hose diaphragm is subject to cyclical squeezing under the force transmitted by the hydraulic oil, leading to cyclical compression and relaxation of the internal fluid chamber, thus producing volumetric change and continuous fluid delivery. Technical data indicates a capacity range of 1–450 m³, a temperature range of -120°C to 120°C, and a pressure range of 0–34.5 MPa.
The hose diaphragm rupture alarm function provides real-time monitoring of the hose diaphragm operation status during the delivery of hazardous fluids, ensuring absolutely secure delivery without any leaking. This safety feature is particularly important in petrochemical and heavy industrial applications where the consequences of pump failure can be severe.
Application in the Oil and Gas Sector
The oil and gas industry demands pumping equipment that can withstand extreme conditions while maintaining operational reliability. Depamu's products are extensively used in this sector, with applications ranging from oil-gas field Water Injection Pumps and polymer injection pumps to oil hydrogenation refining pumps and coal seam water injection pumps.
Offshore Oil and Gas Platform Solutions
A notable example of Depamu's capability in the oil and gas sector is its delivery of a super-large flow high-pressure water injection pump system for CNOOC's FPSO (Floating Production Storage and Offloading) project in the South China Sea. This custom-built pump system, equipped with an 800 KW motor drive, achieves a maximum working pressure of 30 MPa and a single-unit daily water injection volume of 2,000 m³, meeting the secondary oil recovery requirements of offshore oil fields.
The system features a PLC-based control system that enables real-time closed-loop regulation of pressure, flow, and temperature, with a fault warning accuracy of ≥99%. The pump has passed API 674 and DNV-GL certifications, and its salt spray corrosion-resistant design ensures stable operation in the high-temperature, high-humidity environment of the South China Sea. This project represents a significant breakthrough in the localization of deep-sea water injection equipment, demonstrating China's advanced manufacturing capabilities in high-end equipment.
In a separate delivery, Depamu successfully provided multiple sets of offshore platform chemical agent injection skid equipment and high-pressure reciprocating pumps to CNOOC for oil and gas extraction operations in the South China Sea and Bohai Sea. The equipment, described as a "precision pharmacist" for marine equipment, achieves high-precision and stable injection of various high-risk chemical agents. Facing the space constraints of offshore platforms, Depamu's research team innovatively adopted a three-layer skid-mounted structural design, reducing floor space by 40% to 50% compared to traditional designs. The design also utilizes height differences to reduce pump cavitation risk and extend equipment life. For the highly corrosive marine environment, the team optimized welding processes and upgraded to corrosion-resistant materials such as dual-phase steel and titanium, ensuring long-term stable operation in harsh environments.
Onshore Oil and Gas Applications
In onshore oil and gas operations, Depamu's high-pressure reciprocating pumps serve as water injection pumps for enhanced oil recovery, polymer injection pumps for viscosity enhancement, and alcohol injection pumps for flow assurance. The pumps' ability to handle a wide range of flow rates and pressures makes them adaptable to the varying demands of different reservoirs and extraction stages. The availability of multiple power sources — including diesel engines and solar energy — is particularly valuable in remote onshore locations where grid electricity may be unavailable.
Application in the Petrochemical Sector
The petrochemical industry presents unique challenges for pumping equipment, including the need to handle corrosive chemicals, high temperatures, and the requirement for zero leakage when dealing with toxic or flammable substances. Depamu's process diaphragm pumps are specifically designed to address these challenges, with the diaphragm serving as a barrier between the hydraulic end and the process fluid, ensuring no leakage during transportation.
Major Project: Zhenhai Refining & Chemical
A landmark achievement in Depamu's petrochemical applications is the development of two super-large high-pressure diaphragm pumps for Sinopec's Zhenhai Refining & Chemical Company's isononanol project. Each pump weighs nearly 26 tons and represents a breakthrough in breaking foreign technological monopolies in the field of super-large flow high-pressure pumps. Isononanol is an important chemical raw material widely used in the production of fine chemicals and new materials, making it an indispensable component of the "new infrastructure" industrial chain.
Zhenhai Refining & Chemical, with a crude oil processing capacity of 27 million tons per year, is a world-class green chemical base. However, the super-large flow, high-pressure transfer pumps required for production had long been dependent on imports. Depamu's independently developed pump, featuring intellectual property rights, helps Zhenhai Refining & Chemical improve the localization rate of key equipment. The development process took over 400 days, with the main challenge being the balance between ultra-high pressure and large flow — a technical bottleneck that traditional pump designs often struggle to address simultaneously. Depamu overcame this through innovative design and repeated testing, adopting unique structures and materials.
Chemical Dosing and Injection Systems
Depamu's chemical dosing packages and injection systems are widely used in petrochemical operations for the precise introduction of corrosion inhibitors, scale inhibitors, demulsifiers, and other process chemicals. The DP(M)WA hydraulic diaphragm metering pump, with its internal safety valve and compensation valve enabling automatic air discharge and oil replenishment, provides outstanding and reliable performance in these critical applications. The pump's flow rate adjustment modes — including manual, electrical, pneumatic, and frequency conversion — offer flexibility in integrating with various control systems.
Application in Heavy Industry
Beyond oil and gas and petrochemicals, Depamu's pumps serve a broad range of heavy industries including coal chemical, lithium battery, new material, mining, metallurgy, energy, and environmental protection. These industries often require the handling of highly viscous fluids with particles, abrasive slurries, and other difficult media.
Metallurgy and Mining
In metallurgy, Depamu's high-pressure water dephosphorization pumps play a critical role in surface treatment processes. The pumps' ability to deliver high-pressure water with precise control makes them suitable for descaling and rust removal applications in steel production. In mining operations, the pumps are used for salt mine water injection and coal seam water injection, where reliability under continuous operation is essential.
Coal Chemical Industry
The coal chemical industry, particularly coal water slurry gasification, presents one of the most challenging pumping environments due to the abrasive nature of the slurry and the high solid content. Depamu's high-pressure process hose pumps are specifically designed for this application, capable of handling solid content up to 80% with stable delivery and low pulsation. The direct-through wheel and end pump head cavity design — without any threaded parts — prevents clogging and wear, while the roller bearing connection in the connecting rod allows low-speed operation (rated speed <60 r/min) with low piston linear speed and even fluid cavitation.
New Energy and Environmental Protection
As the world transitions toward cleaner energy sources, Depamu has positioned itself to serve the emerging new energy sector. The company's pumps are used in lithium battery production, where precise metering of electrolytes and other chemicals is critical. In environmental protection applications, Depamu's dosing systems and water treatment equipment support wastewater treatment, desalination, and other processes essential for sustainable industrial operations.
Technological Innovation and Competitive Advantages
Research and Development Capabilities
Depamu's competitive position is built on a foundation of continuous innovation. The company has successfully applied for over 100 technical patents, including 38 invention patents, and serves as a drafter of pump industry standards. The company's research and development efforts have been recognized through its designation as a national-level key "little giant" enterprise specializing in niche sectors and a recipient of Zhejiang Province's first-set equipment certification.
The development of the super-large high-pressure process diaphragm pump exemplifies Depamu's R&D capabilities. The project took five years of collaborative research with top domestic research institutes and achieved a breakthrough in ultra-high-pressure sealing technology for zero-leakage operation, intelligent PLC and DCS monitoring systems for real-time fault warning (improving maintenance efficiency by 40%), and modular design adaptable to various complex working conditions.
Quality Assurance and Certifications
Depamu's products have passed rigorous testing and certification processes. The company holds API, CE, ISO 9001, ISO 14001, and ISO 45001 certifications, demonstrating compliance with international standards for quality management, environmental management, and occupational health and safety. For offshore applications, products have obtained API 674 and DNV-GL certifications, ensuring they meet the stringent requirements of the marine environment.
The company has imported advanced digital test systems to ensure product quality and performance. Each pump undergoes comprehensive testing before delivery, and the performance data from these tests provide the basis for continuous improvement.
Customization and Engineering Support
Recognizing that industrial pumping requirements are rarely one-size-fits-all, Depamu offers extensive customization options. Materials of wetted parts can be selected from alloy steel, stainless steel, dual-phase steel, titanium, Hastelloy, and various high-polymer materials, depending on the specific corrosivity and temperature of the process fluid. Pump heads can be configured as hydraulic diaphragm type, plunger type, or piston type to suit different working conditions.
The company's engineering teams work closely with clients to design complete pumping solutions, from individual pump units to fully integrated chemical dosing packages and skid-mounted systems. This engineering support extends to installation, commissioning, and ongoing maintenance, ensuring optimal performance throughout the equipment lifecycle.
Global Reach and Market Presence
Depamu's products have been exported to over 60 countries and regions, including the United States, the United Kingdom, France, Pakistan, Iran, Iraq, Turkmenistan, Sudan, Thailand, Indonesia, Brazil, and Australia. The company's international presence is supported by a network of distributors and service partners, enabling responsive support for clients worldwide.
The company's strategic partnerships with major state-owned enterprises in China — including CNPC, SINOPEC, CNOOC, and CNNC — provide a strong domestic foundation, while its export activities demonstrate the competitiveness of its products in international markets. International experts have noted that Depamu's breakthroughs represent not just the success of individual products but a broader shift in the global equipment manufacturing landscape.
Conclusion
Depamu (Hangzhou) Pumps Technology Co., Ltd. has established itself as a leading provider of industrial pumps for the oil and gas, petrochemical, and heavy industry sectors. Through a combination of technological innovation, manufacturing excellence, and customer-focused engineering, the company has developed a comprehensive product portfolio capable of meeting the most demanding fluid transfer challenges. From the deep waters of the South China Sea to the refining complexes of coastal China, Depamu's pumps are powering critical industrial processes with precision, reliability, and safety.
As industries worldwide continue to evolve toward greater efficiency, stricter environmental standards, and higher levels of automation, the demand for advanced pumping solutions will only grow. Depamu's commitment to research and development, as evidenced by its extensive patent portfolio and pioneering products such as the super-large high-pressure d