Deepwell & Cargo Pumps
DESMI supplies Deepwell & Cargo Pumps for the safe, efficient marine transfer of liquefied gases and demanding chemical cargoes. Built for shipowners, yards and system integrators working with gas carriers, bunker vessels and chemical tankers, these marine cargo pumps are designed to support reliable handling of LPG, LNG, ammonia, ethylene, CO₂ and compatible chemicals under demanding operating conditions.
As cargo chains evolve, cargo pump selection is no longer only about flow and pressure. It is also about containment, material compatibility, cryogenic capability, maintainability and integration with modern low-emission vessel concepts. DESMI combines long-standing marine pumping experience with proven deepwell pump technology to help operators build cargo handling systems that perform safely today and remain relevant for future applications, including CCS-related CO₂ logistics and green shipping projects.
On this page, you can explore where Deepwell & Cargo Pumps are used, which technical features matter most, and how DESMI supports specification, documentation and lifecycle service. For product-specific information, see the NDW deepwell cargo pump, explore DESMI Marine solutions, or review CCS flow solutions.
Deepwell & Cargo Pumps for safe marine cargo handling
Deepwell & Cargo Pumps are vertical cargo pumps used to load, unload and transfer liquid cargoes directly from cargo tanks in a controlled and efficient way. In marine applications, this pump principle is widely used where cargo characteristics place high demands on safety, suction performance, containment and operational reliability. This includes liquefied gas transport, bunker operations and selected chemical tanker duties.
DESMI offers deepwell cargo pump solutions developed for demanding marine service, including liquefied gases such as LPG, LNG, ammonia, ethylene and CO₂, as well as compatible chemical cargoes. The range is relevant to both conventional gas transport and emerging cargo chains linked to low-emission shipping, onboard carbon capture and carbon capture and storage infrastructure.
For operators and designers, the value of a well-engineered deepwell cargo pump lies in more than cargo transfer alone. The pump must support stable operation across varying tank levels, preserve cargo integrity, fit vessel layout constraints and simplify service planning over time. DESMI addresses these requirements through proven pump hydraulics, robust sealing concepts, material options for cryogenic and corrosive media, and system support for booster duty where terminal conditions require higher discharge pressure.
DesCargo Deepwell Pump (NDW) Video
Marine cargo pumps for gas carriers, bunker vessels and chemical tankers
Marine cargo pumps are used across a broad range of specialised vessel types, each with its own cargo profile, temperature range and operating pattern. DESMI deepwell pump solutions are relevant wherever the safe transfer of gas or chemical cargo is a critical part of vessel performance.
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Typical vessel and application areas include:
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In LPG and LEG trades, cargo handling systems must combine strong suction capability with secure containment and robust materials. On LNG bunker vessels and ammonia carriers, temperature conditions and cargo sensitivity place further demands on design and operation. In chemical tanker service, compatibility with corrosive or low-viscosity liquids is often decisive when specifying the right cargo pump configuration.
CO₂ logistics is a growing area in which deepwell cargo pumps are gaining strategic importance. In marine CCS applications, liquid CO₂ may need to be transferred between onshore storage and vessel, or managed in onboard offloading systems. This requires pump designs suitable for low-temperature liquid handling, reliable sealing and service considerations that support practical marine operations.
Electric cargo pumps with efficient suction performance and operational reliability
Electric cargo pumps play an important role in modern marine cargo systems because they support controlled operation, efficient power use and straightforward integration with vessel electrical architecture. In deepwell arrangements, electrically driven pump systems can help shipowners and designers align cargo handling with wider vessel strategies for energy efficiency, emissions reduction and operational flexibility.
DESMI electric cargo pumps are designed to combine dependable transfer performance with strong suction characteristics. In practice, this means stable pump operation under demanding tank conditions, a reduced risk of operational disturbance, and support for efficient unloading or transfer cycles. For liquefied gases and other sensitive cargoes, suction performance is a key engineering parameter because available NPSH can be limited by onboard conditions, cargo properties and system layout.
DESMI places strong emphasis on hydraulic efficiency and NPSH performance across its deepwell cargo pump range. This supports lower power consumption and contributes to reduced operating costs over time, while maintaining the reliability required in gas cargo pump applications. For marine operators moving towards more electrified vessel concepts, electrically driven cargo pumps also fit well with future low-emission design thinking, whether that involves alternative fuels, shore power integration or broader onboard energy optimisation.
Why electric cargo pumps matter in marine systems:
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Efficient cargo transfer with controlled motor-driven operation
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Strong suction performance in demanding marine layouts
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A good fit with low-emission and electrified vessel concepts
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Reliable day-to-day operation across varied cargo handling profiles
Gallary of DesCargo Deepwell Pumps at DESMI's Production Facilities in China
Deepwell & Cargo Pumps for cryogenic, corrosive and future cargoes
Deepwell & Cargo Pumps used in gas and chemical service must handle a wide cargo spectrum without compromising safety or performance. DESMI positions its range for liquefied gases and chemicals that involve cryogenic temperatures, corrosive behaviour or changing transport requirements over time.
Relevant cargoes include LPG, LNG, ammonia, ethylene, CO₂ and compatible chemicals. These media place very different demands on pump design. LNG and ethylene require cryogenic capability. Ammonia introduces corrosive considerations. CO₂ handling can involve low-temperature liquid service and growing operational demands from carbon transport chains. Chemical cargoes may require specific stainless steel selections or tailored compatibility assessments based on composition, temperature and duty profile.
This flexibility is increasingly important as shipping and industry develop new infrastructure around decarbonisation. Liquid CO₂ transport linked to CCS is one clear example. Another is the expected growth in ammonia logistics and bunkering as new fuel pathways mature. In such applications, selecting the right dw cargo pumps solution is not simply a question of matching current cargo data. It also involves evaluating whether the pump arrangement can support future operating scenarios, new terminal interfaces or modified cargo portfolios.
DESMI supports this process with application knowledge, cargo compatibility insight and related deepwell technology for low-temperature service. This includes solutions relevant to CCS flow systems and complementary concepts such as the DESMI canned deepwell pump - CDW for selected low-temperature liquid handling duties.
Robust design features in deepwell pump systems
In marine cargo service, design details have a direct impact on containment, uptime and lifecycle cost. DESMI deepwell pump systems are engineered around practical operating experience and technical features that support the safe transfer of difficult media.
Key design characteristics include a well-proven double shaft seal, a reduced number of impeller stages, robust construction and pump geometries developed for efficient hydraulic performance. The sealing arrangement is particularly important in cargo applications because leakage control and operational safety are central requirements on gas carriers and chemical tankers.
Material selection is another critical factor. Stainless steel material options are available for low-temperature cargoes and specialised chemical requirements. Depending on the cargo and duty, designs can be supplied in materials such as AISI 304 or 316L stainless steel, while cryogenic service down to very low temperatures is addressed through suitable material configuration and design selection. Corrosion resistance, thermal stability and cargo compatibility must always be assessed as part of the total pump specification.
Additional features that support operational resilience include the possibility of rotating the shaft in the opposite direction in the event of ice blocking, as well as design choices intended to simplify installation and maintenance. Altogether, these features help reduce operational risk and support a long service life in demanding marine environments.
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Double shaft seal for enhanced containment
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Reduced impeller stages for a more optimised design
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Stainless steel options for cryogenic and chemical duties
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Corrosion-resistant construction for demanding cargoes
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Design features that support service access and uptime
Booster Pumps and Integrated Cargo Pressure Solutions
A deepwell cargo pump does not always operate alone. In some systems, a deck-mounted booster pump is needed to raise total cargo pressure to the level required by the receiving terminal or downstream piping arrangement. This is particularly relevant when the vessel-side cargo handling line must overcome additional system resistance, longer transfer distances or terminal pressure requirements that exceed the deepwell pump’s standalone duty point.
DESMI’s booster pump concept is designed to work together with the deepwell cargo pump as part of an integrated cargo pressure solution. In operational terms, the deepwell pump lifts and transfers the cargo from the tank, while the booster pump adds pressure in the deck line where needed. The combined arrangement should always be matched carefully to the full system curve, including expected flow, line losses, differential pressure and cargo temperature.
For engineers and buyers, this means system integration is just as important as individual pump performance. Capacity, head, NPSH margin, temperature range and control philosophy must be assessed across the entire cargo handling line. A properly matched deepwell pump and booster pump combination can help maintain stable transfer conditions, support terminal interface requirements and reduce the risk of operating the pump package away from its optimal duty point.
