An LNG to CNG refueling skid converts liquefied natural gas into compressed natural gas for vehicle fueling. It typically combines LNG pumping, vaporization, gas conditioning, pressure control, and dispensing equipment into a packaged system. The right configuration depends on the required fueling pressure and flow, vehicle type, site conditions, and local codes. At Dongzhao, we encourage buyers to define these project requirements before comparing equipment or requesting a quotation.
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An LNG to CNG refueling skid is a packaged process unit used to turn stored LNG into high-pressure natural gas for dispensing. Unlike a conventional CNG station that receives pipeline gas, this arrangement begins with LNG stored in a cryogenic tank. The skid handles the process equipment between LNG storage and the CNG dispensing equipment, although the exact package boundary varies by project.
The term “skid” describes equipment arranged on a common frame or base for installation as a coordinated unit. It does not necessarily mean that every station component is included. Storage tanks, dispensers, civil works, utilities, and control-room equipment may be supplied separately, so buyers should confirm the scope in writing.
LNG is kept in insulated storage equipment at cryogenic temperature. At approximately atmospheric pressure, methane-rich LNG boils at about -162°C, although actual storage conditions depend on pressure, composition, and system design. A transfer arrangement moves LNG from the storage tank to the skid while managing the temperature and pressure conditions required by the process.
The system raises the LNG pressure using a pump or another design suited to the station. The pressurized liquid then passes through a vaporizer, where heat changes it into gas. Vaporizer selection and capacity must reflect the required gas flow, ambient conditions, operating schedule, and intended pressure range.
After vaporization, the gas may pass through pressure-control, measurement, safety, and control components before reaching the dispenser. The station design should ensure that the delivered gas meets the requirements of the connected vehicles and dispensing equipment. The final arrangement depends on the target fueling pressure and the applicable local requirements.
LNG to CNG refueling skids can suit sites where LNG supply is available but pipeline access is limited, unavailable, or not aligned with the project plan. Potential applications include fleet depots, transport hubs, industrial locations, and other planned vehicle-fueling sites. Suitability depends on LNG logistics, demand, permitting, and the economics of the complete station rather than the skid alone.
The system can also be considered where a project needs a packaged process unit that can be integrated with storage and dispensing equipment. For a fleet operator, the relevant question is not simply whether the skid can produce CNG, but whether it can serve the fleet’s fueling schedule. Daily demand, peak-hour demand, vehicle tank requirements, and room for future expansion should all be reviewed together.
There is no single specification that defines every LNG to CNG refueling skid. Buyers should request a project-specific datasheet and confirm operating limits, utility requirements, interfaces, and included equipment. The following items provide a practical starting point for technical discussions.
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| Specification | What to clarify | Why it matters |
|---|---|---|
| Gas capacity | Rated flow, operating range, and stated reference conditions | Helps determine whether the system matches average and peak demand |
| Outlet pressure | Required delivery pressure and allowable operating range | Must align with the dispensing system and vehicle requirements |
| LNG conditions | Inlet pressure, temperature, composition assumptions, and supply connection | Affects process design and equipment interfaces |
| Vaporizer design | Type, capacity, ambient limits, and any backup arrangement | Influences performance under site and operating conditions |
| Controls and safety | Control philosophy, instrumentation, alarms, shutdowns, and documentation | Supports integration, operation, and project review |
| Package boundary | Included equipment, exclusions, utilities, and connection points | Reduces gaps between the skid and the rest of the station |
Estimate the number and type of vehicles, the fuel required per operating day, and when vehicles will refuel. Average consumption alone may not show whether several vehicles will need fuel at the same time. Share both normal and peak demand with the supplier, along with any planned fleet expansion.
Confirm the pressure required at the point of dispensing and identify the dispenser, storage, and process connections that the skid must support. CNG vehicle fueling systems commonly operate in pressure ranges that can reach approximately 200–250 bar, but the required value depends on the vehicle, station design, and applicable standard. Treat this as a planning reference, not a guaranteed skid rating, and specify the project requirement directly.
Provide the supplier with site location, ambient conditions, available utilities, layout constraints, and relevant LNG supply information. These details help assess vaporizer configuration, electrical and control interfaces, maintenance access, and installation needs. A preliminary layout review can identify coordination issues before equipment is finalized.
Ask whether the quotation covers the skid only or also includes storage, dispensers, instrumentation, installation support, commissioning assistance, and operating documentation. Clarify which party is responsible for civil works, electrical connections, piping beyond the package boundary, and local approvals. Clear responsibility assignments make technical and commercial comparisons more meaningful.
A capable supplier should be able to explain the process flow, identify package boundaries, and provide the technical information needed for project review. Before placing an order, request a datasheet, scope list, interface information, utility requirements, and the applicable technical documents available for the proposed configuration. Ask how design changes, inspection requirements, delivery planning, and after-sales questions will be managed.
At Dongzhao, we work with buyers to clarify LNG conditions, target CNG delivery requirements, site constraints, and the intended station scope before discussing a suitable configuration. The more complete your inquiry, the easier it is to evaluate feasibility and prepare a relevant proposal. Share your required capacity, pressure, LNG supply data, location, and project schedule when requesting a technical review.
An LNG to CNG refueling skid is a practical process option when a project needs to convert stored LNG into compressed natural gas for vehicle fueling. Whether it is the right choice depends on the full supply chain, vehicle demand, pressure requirements, site conditions, and station scope. Start by documenting these requirements, then compare supplier proposals against the same technical and commercial basis.
For your next step, prepare a project brief that includes expected daily and peak demand, target delivery pressure, LNG supply conditions, site location, available utilities, and required package boundaries. Dongzhao can use this information to discuss a suitable configuration and clarify what should be included in a project-specific quotation. Do not finalize equipment selection until interfaces, applicable requirements, and responsibilities are understood by all project parties.
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