Skid-Mounted LNG Station Capacity Selection Guide
To select a skid-mounted LNG station capacity, first define the required LNG throughput per day, the busiest dispensing period, and the number of days of supply you need to hold between deliveries. Then size the storage, unloading, and dispensing systems against those requirements, while checking site conditions and applicable regulations. “Capacity” can mean storage volume, daily throughput, or dispensing rate, so we recommend specifying all three when requesting a quotation. The right configuration is the one that meets your operating demand without creating avoidable delivery, queueing, or expansion constraints.
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Key Takeaways
- Separate the capacity figures: state storage capacity, expected daily demand, and peak dispensing requirement.
- Build from real operating inputs: vehicle count, LNG use per vehicle, operating hours, and delivery frequency.
- Use scenario calculations, not a universal rule: storage reserve and equipment margins depend on logistics, operating patterns, and site requirements.
- Ask suppliers to confirm the design basis: assumptions for usable storage, filling limits, ambient conditions, and future demand should be clear in the proposal.
What “Station Capacity” Means
A skid-mounted LNG fueling station combines equipment arranged on a transportable base or skid to receive, store, and dispense LNG. Depending on the project, the package may also include pumps, piping, instrumentation, controls, safety systems, and unloading connections. The exact scope varies, so buyers should compare equipment lists rather than relying on the station name alone.
Capacity is not a single number. Storage describes how much LNG the tank can hold; throughput describes how much fuel the station must supply over a period; dispensing rate describes how quickly vehicles can be fueled at busy times. We recommend stating each value separately in the project inquiry to avoid comparing proposals with different meanings of “capacity.”
How to Calculate a Preliminary Capacity
1. Estimate daily LNG demand
Start with the vehicles or equipment that will use the station. Multiply the expected number of users by their typical LNG consumption over the same period, and account for operating days, shifts, and seasonal changes. If measured consumption is available, use it; if not, ask fleet operators for a documented estimate and identify it as preliminary.
For example, a hypothetical fleet of 20 vehicles using 80 kg of LNG per vehicle per day would require 1,600 kg, or 1.6 tonnes, per day. This is an example calculation, not a performance claim or a recommended station size. Actual demand depends on vehicle type, route, load, operating conditions, and fueling behavior.
2. Check peak dispensing demand
Daily demand does not show whether vehicles arrive evenly or in a short window. Estimate how many vehicles may fuel during the busiest period, the amount each needs, and the available operating time. For the hypothetical 1,600 kg/day demand above, dispensing that amount across 8 hours would average 200 kg/h; a concentrated schedule could require a higher peak rate.
Use arrival schedules and fueling requirements to discuss the required number of dispensers, pump and piping arrangements, and operating procedures with the supplier. A peak factor can help compare scenarios, but it should be based on the buyer’s expected traffic pattern rather than treated as a universal design value. Also consider whether queues are acceptable or whether the station must support overlapping fueling operations.
3. Set the required supply reserve
Storage planning should reflect replenishment lead time, delivery frequency, road access, and the consequences of a delayed delivery. A buyer might compare one-day, two-day, and three-day reserve scenarios; these are planning cases, not fixed industry requirements. For a hypothetical daily demand of 1.6 tonnes, a two-day usable reserve equals 3.2 tonnes before allowances for operating limits and the station’s design basis.
Do not assume that the tank’s nominal volume is fully available for routine dispensing. Usable inventory depends on the tank design, filling limits, operating conditions, and the supplier’s specified limits. Ask the supplier to show how the quoted gross storage capacity translates into usable LNG inventory and days of coverage.
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4. Convert mass demand to storage volume carefully
LNG density varies with composition and temperature, so a mass-to-volume conversion should be treated as an estimate until the project design basis is confirmed. For preliminary illustration only, using an assumed density of 450 kg/m3, 3,200 kg corresponds to about 7.1 m3 of LNG. This calculation represents usable liquid volume only; it does not establish the required nominal tank size or allowable filling level.
Ask the supplier to confirm the LNG properties and assumptions used in the proposal. Storage volume, tank working limits, and the selected operating reserve must be checked together rather than selected from a simple conversion alone. Local requirements and the project’s safety review also affect the final configuration.
Capacity Selection Inputs for Your Inquiry
| Input | What to provide | Why it matters |
|---|---|---|
| Demand | Users, consumption per user, operating days, and expected growth | Establishes daily and future throughput requirements |
| Peak use | Arrival patterns, busy periods, fueling frequency, and acceptable queues | Informs dispenser and process capacity discussions |
| Supply logistics | Delivery frequency, transport access, and expected replenishment time | Helps determine the storage reserve scenario |
| Site conditions | Available footprint, access, ambient conditions, and project requirements | Can affect layout, equipment selection, and installation planning |
| Project scope | Required equipment, controls, interfaces, and installation responsibilities | Enables a meaningful comparison between supplier proposals |
Common Capacity Selection Mistakes
Choosing by tank size alone
A large storage tank does not automatically provide adequate peak dispensing performance. Confirm that storage, pumps, piping, dispensers, and operating schedules are considered as one system. Ask the supplier to identify any assumptions or limits that affect the stated throughput.
Ignoring delivery and site constraints
Storage needs may change if deliveries are difficult to schedule or if access for LNG transport vehicles is restricted. Confirm the delivery vehicle route, unloading location, site layout, and available space during the early planning stage. These details can influence both the practical station capacity and the project scope.
Leaving no room for demand changes
Demand estimates may change as a fleet grows, operating shifts change, or additional users connect to the station. Compare the current requirement with a realistic future scenario and ask whether expansion can be accommodated in the proposed layout. Avoid paying for capacity based only on speculative growth; document the assumptions behind each scenario.
How to Evaluate a Supplier Proposal
Ask each supplier to state storage capacity, expected usable inventory, design throughput, and the basis for any peak-rate figure. Request a clear scope of supply, interface details, utility requirements, site assumptions, and information on installation and commissioning responsibilities. Confirm which project-specific technical and regulatory reviews remain with the buyer or other contractors.
Compare proposals on the same demand and reserve assumptions rather than on tank volume alone. A useful proposal explains how the selected configuration responds to your usage profile and identifies limitations that could affect operation. If two offers use different LNG properties, filling assumptions, or scope boundaries, clarify those differences before making a commercial comparison.
Conclusion: Select Capacity from Demand, Peak Use, and Supply Resilience
The appropriate skid-mounted LNG station capacity is determined by the combination of daily demand, peak dispensing needs, and the supply reserve required by your delivery plan. Start with measured or documented consumption, model busy-period fueling, and compare storage scenarios against replenishment conditions. Treat calculations as preliminary until the supplier confirms the design basis, usable capacity, site fit, and applicable project requirements.
For a practical next step, prepare your expected users, consumption data, operating schedule, delivery frequency, site information, and growth scenario. Dongzhao can review these inputs with your team and discuss a skid-mounted LNG station configuration suited to your project requirements. Share the assumptions you want evaluated so the capacity discussion can begin with a clear, comparable basis.