Views: 0 Author: Site Editor Publish Time: 2026-06-15 Origin: Site
This is a problem almost every buyer purchasing CNG storage equipment for the first time encounters: cylinder cascades and tube skids look alike, the numbers on the quotation sheets are similar, and the salesperson says both can be used, but no one ever clearly explains which scenario requires which. This article uses two product lines from the Huayan official website—CNG Cylinder Cascade and CNG Tube Skid—to explain the core differences, selection signals, and "what happens if you choose wrong" all at once.
I. Seven Dimensions Side-by-Side Comparison: You'll know who's who once you see it.
Putting the two products in the same table makes the differences clear at a glance:
Comparison Dimension | Cylinder Cascade | Tube Skid |
Cylinder Form | Multiple large-diameter short cylinders (8–12 units), Φ356–559mm, single cylinder water volume 150–3000L | Multiple long tubes (usually 6–10 tubes), arranged axially, larger single tube volume |
Core Application | Fixed station cascade gas storage——High/Medium/Low pressure staged gas storage architecture, providing a step-by-step gas extraction source for filling stations | Mother station → daughter station gas transport + Daughter station gas storage——Transporting high-pressure natural gas to areas without pipeline networks for local gas supply |
Deployment Method | Ground fixed installation, remains stationary after lifting into place; three forms: open frame skid / 20FT container / 40FT container | Can be frequently lifted and transferred, working with semi-trailers for cyclic gas transport; 40FT standard container frame |
Working Pressure | 20 MPa (200 bar) / 25 MPa (250 bar) two options available | 25 MPa (250 bar) |
Typical Capacity | 2500L water volume @ 20MPa ≈ 5000 Nm³; 6000L @ 25MPa ≈ 15,000 Nm³ | 4640 / 5200 / 5568 / 7718 / 9260 Nm³ five levels |
Safety Devices | Standard safety valve and overpressure alarm device; pressure regulation/relief is uniformly controlled by the decompression skid | Standard safety valve (automatic overpressure relief), emergency shut-off valve, pressure gauge + thermometer; burst disc is usually a safety configuration after factory hydrostatic test, not a standard item |
Certification | ISO9001 / ISO14001 / CE / ASME / ADR | ISO 11120 / ASME Pressure Vessel Standard; Factory hydrostatic test + airtightness test |
II. No need to look at the parameter table, just ask yourself four questions.
Often, buyers are not comparing parameters; they are comparing scenarios. The following four judgment signals apply directly to your own project:
① Where does the gas come from?
If the incoming gas is directly output from a compressor and requires the equipment to support a fast-fill station with a high/medium/low pressure three-stage architecture → Choose a Cylinder Cascade.
If the gas is already compressed to 250 bar at the mother station and needs to be transported to another place for gas offloading → Choose a Tube Skid.
② Does the equipment move?
If the equipment will not be moved once in place, serving as a fixed infrastructure of the filling station → Choose a Cylinder Cascade.
If the equipment needs to follow the gas source, moving from loading→arriving at the station→unloading gas→returning to the mother station for cyclic use → Choose a Tube Skid.
③ Is cascade pressure regulation needed?
If cascade pressure regulation (high/medium/low pressure banks for step-by-step gas extraction) is needed to serve a fast-fill station → Choose a Cylinder Cascade, this is its native architecture.
If the downstream already has an independent PRMS pressure reduction and metering skid to handle the pressure → The Tube Skid can just offload gas at a single pressure.
④ Transportation frequency?
If gas needs to be transported across cities daily or weekly, and the equipment is frequently loaded onto flatbed trucks → Choose a Tube Skid. The 40FT standard frame is designed for lifting and transfer.
If the equipment doesn't move even once a month → Choose a Cylinder Cascade, offering better cost-effectiveness.
III. Typical Scenario Quick Reference
Your project is like this | Choose Cylinder Cascade | Choose Tube Skid |
Building a fixed CNG filling station, needing gas storage + staged gas filling | ✓ | |
Mother station has a high-pressure gas source, needing to transport it to a daughter station 50km away for supply | ✓ | |
Fixed gas storage at a bus company depot, vehicles returning for centralized filling | ✓ | |
Remote mining area without pipeline network, receiving gas shipped from the city weekly | ✓ | |
Fixed gas supply for an industrial park, stable pressure is needed, no frequent transfers required | ✓ | |
Serving multiple daughter stations simultaneously, one set of equipment cycles with multiple tractors | ✓ |
IV. If you choose wrong, where will the problem show up?
This question deserves its own discussion because it helps buyers make a decision more than a parameter table does.
Using a Tube Skid as a Cylinder Cascade (fixed at the station without moving):
It's not that it cannot be used, but the price of a Tube Skid includes the cost of the transport frame, lifting interfaces, and the whole machine verification for multiple transfers—if it never moves, these costs are pure premium.
Using a Cylinder Cascade as a Tube Skid (frequently lifted and transported on the road):
The frame of a Cylinder Cascade is designed for fixed installation and has not undergone long-term verification for high-frequency lifting and transport vibration. Moreover, a Cylinder Cascade itself does not contain a complete independent safety valve set. If brought to a daughter station alone, it lacks pressure regulation protection and must be paired with a PRMS decompression skid to operate safely.
Conclusion:
The two products each have a clear usage path in Huayan's product line. It's not that A is better than B, but rather the project positioning determines which one to choose.
Huayan CNG Cylinder Cascade Key Parameters:
Parameter | Specification |
Number of Cylinders | 8–12 units/set, customizable |
Single Cylinder Water Volume | 2000–3000L (large diameter) / 150–200L (small cylinder option) |
Total Water Volume | 6m³ nominal / 20FT container 1066L / 40FT container 2450L |
Working Pressure | 20MPa (200bar) / 25MPa (250bar) |
Capacity Reference | 2500L @ 20MPa ≈ 5000Nm³; 6000L @ 25MPa ≈ 15000Nm³ |
Cylinder Material | 30CrMoL High-pressure cylinder specific steel |
Connection Method | Standard high-pressure flange / Quick coupling |
Certification | ISO9001 / ISO14001 / CE / ASME / ADR |
Huayan CNG Tube Skid Key Parameters:
Parameter | Specification |
Number of Tubes | 6–10 tubes/skid |
Capacity Levels | 4640 / 5200 / 5568 / 7718 / 9260 Nm³ |
Working Pressure | 25 MPa (250 bar) |
Test Pressure | 37.5 MPa Hydrostatic test |
Frame | 40FT standard container frame |
Safety Devices | Safety valve / Emergency shut-off valve / Pressure gauge + Thermometer |
Certification | ISO 11120 / ASME Pressure Vessel Standard |
Set the scenario first, then choose the equipment.
The biggest cost in procurement is not the unit price, but the modification and idling after choosing the wrong equipment. Cylinder cascades and tube skids each have a clear usage path: one is the gas storage heart of a fixed station, the other is the transport vehicle for mobile gas supply. You don't need to memorize all the parameters—go back to the four judgment questions, answer them truthfully against your own project, and the direction of your choice will become clear. Huayan's two product lines can both provide technical solutions based on actual project requirements. Before placing an order, provide the technical team with four pieces of information: gas usage scenario, average daily vehicle trips, gas source, and transfer frequency, and you will receive a matching solution.
