Select an LNG submersible pump by matching its hydraulic duty, installation arrangement, materials, motor and electrical requirements, and operating conditions to the specific application. A pump selected for tank transfer may not meet the pressure or flow requirements of a send-out system, so buyers should define the full operating range before requesting a quotation. LNG is commonly handled near its atmospheric boiling point of about -162°C; the actual temperature and pressure depend on LNG composition and system conditions. This guide explains how to organize those requirements and evaluate a suitable solution.
This guide is for LNG terminal developers, EPC contractors, equipment integrators, procurement teams, and plant operators evaluating a pump for a new or existing facility. It is also useful when preparing an inquiry because a complete duty description helps suppliers assess feasibility and identify missing information. The final selection should be reviewed against the project’s process design, applicable regulations, and site requirements.
An LNG submersible pump is installed inside an LNG-containing vessel or tank, with the pump hydraulics and motor arranged for submerged service. It moves cryogenic liquid from the vessel into a connected process line. Because the pump operates in a low-temperature environment, selection involves more than matching a flow rate: the equipment, interfaces, and installation must suit the fluid and system design.
At a pressure of approximately 1.013 bar(a), pure methane has a boiling point close to -162°C; LNG is a mixture, so its boiling behavior varies with composition and operating pressure. This is useful context, not a substitute for the project’s specified design temperature and pressure. Ask the process team to provide the actual operating envelope, including relevant start-up, shutdown, and upset cases.
These duties can overlap in a facility, but their requirements are not automatically interchangeable. A send-out duty may place different demands on discharge pressure and control than a tank-transfer duty. Provide the complete process description so the supplier can evaluate the intended service rather than infer it from the application label.
Submersible pump designs vary by hydraulic arrangement, motor construction, mounting interface, and integration with the tank or vessel. The correct configuration depends on the tank layout, available space, maintenance strategy, and process duty. Do not assume that a pump can be substituted into an existing installation without checking dimensions, connections, electrical interfaces, and operating conditions.
Materials in cryogenic service must be assessed for the specified temperature, fluid, pressure, and mechanical loads. Buyers should request the proposed material selection for wetted parts and relevant structural components, along with the supplier’s basis for that selection. Any project-specific material, inspection, or documentation requirements should be stated in the inquiry rather than left for late-stage clarification.
| Specification area | Information to provide or confirm |
|---|---|
| Hydraulic duty | Minimum, normal, and maximum flow in m³/h; differential head in m or discharge pressure in bar. |
| Process conditions | Fluid composition if available, operating and design temperature in °C, suction conditions, and pressure range. |
| Installation | Tank or vessel drawings, mounting arrangement, connection sizes, available submergence, and access constraints. |
| Electrical and controls | Power supply, motor requirements in kW, control philosophy, instrumentation interfaces, and site-area classification. |
| Project requirements | Applicable codes, inspection and testing scope, documentation, delivery location, and requested schedule. |
List each duty the pump must perform and identify its minimum, normal, and maximum operating points. Include the pressure required at the destination, line losses, elevation effects, and any system conditions that change the duty. If the pump is expected to serve more than one application, ask the process engineer to confirm whether one pump can cover all cases.
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Provide the vessel layout and the expected liquid levels, including the lowest level at which pumping is required. Ask the supplier to review the mounting arrangement, connections, clearances, and maintenance access. Installation details can affect feasibility even when the requested flow and pressure appear suitable.
Compare the proposed materials and motor arrangement with the project’s temperature, pressure, electrical supply, and area classification requirements. Confirm how the pump will be started, controlled, monitored, and isolated within the process. Where requirements are not yet finalized, mark them as pending instead of treating assumptions as confirmed specifications.
Request a technical proposal that identifies the offered configuration, stated operating limits, interfaces, exclusions, and required project inputs. Review any performance information against the project duty points and ask questions about conditions that are not covered. A quotation should make clear what is included, such as documentation, inspection, testing, and accessories, rather than relying on a headline price alone.
Price and delivery schedule depend on the selected configuration, materials, motor and electrical requirements, documentation, inspection scope, and project-specific interfaces. Minimum order quantities, if applicable, should be confirmed directly with the supplier because they may depend on the product configuration and commercial arrangement. Lead time should likewise be requested against a defined scope and should distinguish equipment production from drawing approval, inspection, and shipment where relevant.
For a useful commercial comparison, issue the same technical specification to each bidder and ask them to list deviations and exclusions. Compare the total scope and delivery assumptions, not just the quoted equipment price. If project inputs are incomplete, ask suppliers to identify the open items that could affect pricing or schedule.
At Dongzhao, we can discuss LNG submersible pump requirements for storage, transfer, and send-out projects and review the information needed to assess a proposed configuration. Share the duty points, process conditions, vessel drawings, electrical requirements, and project documentation needs so the scope can be evaluated more effectively. Any final selection should be confirmed against the project’s engineering basis and applicable site requirements.
The right LNG submersible pump is the one that fits the defined hydraulic envelope, cryogenic conditions, installation, electrical system, and project requirements. Start by documenting flow, pressure or head, temperature, liquid-level range, and the destination system for every operating case. Then compare supplier proposals for technical fit, scope clarity, support, and confirmed commercial terms.
For your next step, prepare a project inquiry with the operating cases and available drawings, and ask Dongzhao to review the information with your team. Clear inputs make it easier to identify open questions and assess a suitable pump solution before procurement decisions are finalized.
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