NMX‑CNGC‑250 / Rev 00 / IS 7285 · IS 3224 / Noida · India 2026 · Product Page

NMX-CNGC-250 · ENGINEERED TO ORDER — CNG CASCADE SYSTEMS

Gas at 250 bar, held where the pipeline ends.

Name: CNG Storage & Mobile Cascades — 250 bar Cascade Systems
Brand: Neometrix

High-pressure CNG cascades — banks of cylinders in a certified frame with manifold, valves and a full safety train. Stationary three-bank cascades that let a station fill more vehicles, faster, without short-cycling the compressor; and mobile cascades from 4,500 water litres in steel to 9,360 WL in Type IV composite that carry gas by road to where no pipeline runs. Engineered to order — the reference configuration on this page has not yet been built.

Enquire — CNG cascades Capability sheet (PDF)

Fig · 01 A stationary storage cascade with its manifold and vent line — illustrative render

Pressure

250bar(g)

Capacity

3,000–9,360water litres

Cylinders

Type Ior Type IV

Banks

3or single bank

Ambient

−20/+65°C · Type I

ISO 9001 / 14001 Engineered to order IS 7285 · IS 3224 Approvals in scope of supply Noida · India

Overview

A compressor cannot fill a queue. Storage can.

A CNG station’s compressor delivers a steady, modest flow. A forecourt does not want steady and modest — it wants a burst of gas into one vehicle, then the next. Cascade storage is what bridges those two. It buffers the compressor’s output so a station can serve more vehicles than the compressor alone could, fill each one faster than drawing off the machine directly, and stop the compressor starting and stopping every few minutes, which is what wears it out.

Illustrative render — a mobile gas cascade on a road trailer: a long steel skid frame on a flatbed semi-trailer carrying a bank of horizontal high-pressure cylinders held by heavy saddle clamps and tie bars, with a valve and manifold cabinet at the rear carrying pressure gauges and hose connections

Fig · 02 A trailer-mounted mobile cascade — illustrative render

A stationary cascade does that job in three banks — low, medium and high, kept apart by non-return valves so gas cannot drift back between them. A priority panel on the compressor side fills the high bank first; a sequencing panel on the dispenser side draws the low bank first and steps up only when that bank can no longer push gas into the vehicle. Compared with a single bank of the same volume, that can roughly double the gas the storage actually delivers.

A mobile cascade solves a different problem: gas where there is no pipeline. Filled at a mother station, driven to a daughter station and decanted, it makes a CNG outlet possible anywhere a truck can reach. That is also why its frame is the serious part — it is certified by a 4 g static case with every cylinder mounted and filled.

A cascade is not a tank. It is a set of pressure steps, arranged so that most of the gas you paid to compress actually leaves the cylinders.

Engineered to Order

Sized to the duty, not to a catalogue

Storage volume, bank split, cylinder type and frame are set by the station’s throughput, the compressor behind it and the site. The reference configuration here spans 3,000 to 9,360 water litres at 250 bar(g); no order followed the tenders it was engineered against, so no delivered cascade is claimed.

Type I · Type IV

Steel where mass is free, composite where it is not

Seamless steel cylinders to IS 7285 for stationary storage, where weight costs nothing. Fully wrapped Type IV composite for mobile cascades, where cylinder mass and gas mass share one axle allowance — which is how a mobile unit reaches 9,360 WL.

PESO · BIS · TPI

Approvals carried as scope, not assumed

Cylinders sourced to IS 7285 and hydrostatically tested by their manufacturer, valve fittings to IS 3224, and the assembled cascade taken through PESO/CCOE approval, BIS certification and third-party inspection as part of the supply, then shipped fully assembled.

Architecture

Store, move, and vent safely.

The schematic below is both configurations — the three-bank stationary cascade feeding a dispenser, the single-bank mobile cascade running mother-to-daughter, and the per-cylinder safety train they share.

FIG · 03CASCADE ARCHITECTURE · THREE-BANK FILL · MOBILE TRANSPORT · SAFETY TRAIN

Fig · 03 Both configurations — sequenced three-bank fill at a station, mobile cascade to a daughter station, and every cylinder’s burst disc manifolded to a common vent

Arc · 01

The Three-Bank Cascade

Low, medium and high banks, each with its own pressure gauge and a temperature gauge on the high bank, kept apart by non-return valves so gas cannot drift back down the ladder. A priority panel charges the high bank first; a sequencing panel on the take-off draws the lowest bank that will still fill and steps up only when it will not — which is what makes the storage efficient rather than merely large.

Arc · 02

The Mobile Cascade

A single bank on a trailer or skid, filled at a mother station and decanted at a daughter station. The engineering that matters is structural: the frame is certified by a 4 g static case with all cylinders mounted and filled, and the cylinders are held in saddle clamps and tie bars designed for road loads rather than shelf loads.

Arc · 03

Manifold & Fittings

Two inlet/outlet manifolds — one working, one spare — each with an isolation valve, so a manifold fault does not take the cascade out of service. Cylinders connect through tube pigtails with double compression ferrule fittings; the vent manifold runs in carbon steel with flanged header and nipples.

Arc · 04

The Safety Train

Every cylinder carries an isolation valve, check valve and a fusible burst disc that ruptures on excess pressure or excess temperature — fire is as dangerous as overfill. All discharges are manifolded to a common vent header, and relief is sized to vent the compressor’s full flow, set no higher than 20 % above MAWP or 75 % SMYS hoop stress, whichever is lower.

Have a CNG cascade, mobile storage or CGD equipment requirement? Send it across — clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference configuration, sized to your station.

The parameters below describe reference stationary and mobile cascades. Water capacity, bank split, cylinder type and frame are set by the station throughput, the compressor duty and whether the unit stands still or travels.

Illustrative render — a high-pressure cylinder manifold in close-up: cylinder necks with brass and stainless valves, curved stainless pigtail tubes with compression ferrule fittings running into a horizontal header pipe, burst-disc safety devices on the branches, and a pressure gauge and isolation valve on the header

Fig · 04 Cylinder valves, pigtails and the manifold header — illustrative render

Where cascades actually fail

Not usually in the cylinders — those are certified, hydro-tested and stamped. It is the connections between them: the pigtail that fatigues from vibration on a trailer, the ferrule that was never properly set, the vent line that was never sized to take every burst disc discharging at once.

That is why the fittings, the vent header and the frame case get the attention on this page rather than the cylinder count. A cascade is an assembly problem more than a storage problem.

Full specification — expand

System	High-pressure CNG cascade — cylinder bank in a certified frame with manifold, valves, instrumentation and safety train · design, engineering, manufacture, assembly, inspection, testing and supply
Pressure	Storage 250 bar(g) · vehicle residual pressure on arrival ≈35 bar(g) · vehicle filled to ≈200 bar(g)
Capacity	Stationary from 3,000 water litres (sum of cylinders at 15 °C) · mobile 4,500 WL Type I · mobile to 9,360 WL Type IV composite
Cylinders	Type I seamless steel to IS 7285:2004, or Type IV fully wrapped composite to ISO 11439 / IS 15490 as nominated, subject to PESO acceptance · sourced from approved manufacturers and hydrostatically tested by them, certificates reviewed by the third-party inspector
Bank Arrangement	Stationary: three-bank (low / medium / high) with non-return valves for sequenced fill, pressure gauge on each bank, temperature gauge on the high bank · Mobile: single bank
Per Cylinder	Isolation valve · check valve · tube pigtail · fusible burst disc with washer · spindle & handles · safety relief device
Manifold	2 × inlet/outlet manifold (1 working + 1 spare), each with isolation valve · double compression ferrule fittings on tube connections · carbon-steel vent manifold throughout
Safety	Fusible burst disc ruptures on excess pressure or excess temperature, individually or combined · all burst-disc discharges manifolded to a common vent header · relief capacity sized to vent the compressor’s maximum flow · set pressure ≤20 % above MAWP or the pressure giving 75 % SMYS hoop stress, whichever is lower
Frame	Certified by a 4 g static case covering the complete assembled cascade, fully loaded · cylinders held in saddle clamps and tie bars · shipped fully assembled
Environment	Type I steel cascades: operational −20 °C to +65 °C · Type IV composite: −10 °C to +55 °C · outdoor industrial service, tropicalised, protected against vermin ingress
Codes & Approvals	IS 7285:2004 cylinders · IS 3224:2002 valve fittings · IS 5844 · PESO / CCOE approval · BIS certification · third-party inspection · calibration and test certificates for all instruments
Status	Engineered to order — reference configuration, not yet built · cascade sized to the customer’s storage duty, cylinder type and site · scope settled at design review

PDF · 1 page

CNG Storage & Mobile Cascades — Capability Sheet

Tender Response

Send your specification — compliance matrix in two working days

Variants

One pressure discipline, several names.

Different tenders call this a cascade, a storage bank, a mobile refueller or a gas transport module. The engineering — cylinders, frame, manifold, safety train — is common to all of them.

Var · 01

Stationary Storage Cascade

Three-bank storage for a CNG station forecourt, from 3,000 water litres at 250 bar(g), on a plinth-mounted frame with sequenced dispenser take-off.

Var · 02

Mobile Cascade — Type I

Single-bank seamless-steel cascade from 4,500 water litres, skid or trailer mounted with a 4 g certified frame, for mother-to-daughter station transport.

Var · 03

Mobile Cascade — Type IV Composite

Fully wrapped composite cylinders to 9,360 water litres, where the weight saved over steel converts directly into payload — more gas delivered per trip on the same axle limit.

Var · 04

Other Gases & Adjacent Equipment

The same cascade engineering serves biogas (CBG), hydrogen, nitrogen and industrial gas banks, alongside decompression units, boosters and gas-distribution skids from the wider Neometrix gas line.

Applications

Where it applies.

Wherever compressed gas has to be held at pressure, or moved without a pipeline.

A · 01CNG station forecourt storage — city gas distribution networks

A · 02Mother–daughter station gas transport where no pipeline exists

A · 03Compressed biogas (CBG) storage & evacuation from production plants

A · 04Industrial gas banks — captive high-pressure storage

A · 05Fleet & depot refuelling installations

A · 06Hydrogen & alternative-fuel storage banks (configured to the gas)

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Why three banks instead of one big one?

Because gas only flows from higher pressure to lower. With a single bank, once its pressure falls near the vehicle’s tank pressure the fill stalls, and the gas left behind is stranded until the compressor tops it back up. Splitting the storage into low, medium and high banks lets a sequencing panel start the fill on the low bank — using up the gas that is least useful for a fast finish — step to medium when the low bank can no longer push gas across, and only call on the high bank for the last part of the fill. Far more of the stored gas is actually delivered, and the compressor cycles less often. It does not do less total work: every kilogram delivered still has to be compressed.

Q · 02 What does “water litres” mean for a gas cascade?

Water capacity is the internal volume of the cylinders, measured as the litres of water they would hold, summed across the bank at 15 °C. It is used rather than a gas figure because the mass of gas a cascade holds depends on pressure and temperature, which move about, whereas the internal volume does not. A 4,500 WL cascade at 250 bar(g) therefore describes a fixed, checkable, physical thing — and how much gas that represents follows from the pressure and the gas composition on the day.

Q · 03 Why Type IV composite for mobile cascades?

Because a road vehicle has an axle limit, and cylinder mass and gas mass have to share it. Type I seamless steel cylinders are robust and inexpensive, which is exactly right for a stationary cascade where mass costs nothing. A Type IV cylinder — a polymer liner fully wrapped in composite — is substantially lighter for the same volume and pressure, so within the same laden weight you can put considerably more water capacity on the trailer. That is the difference between a 4,500 WL steel mobile cascade and a 9,360 WL composite one, and over the life of a mother–daughter route it is the difference between two trips and one.

Q · 04 Why must the burst disc respond to heat as well as pressure?

Because the dangerous case is fire, not overfilling. A cylinder engulfed in flame will have its wall weakened by heat long before its internal pressure reaches the point a pressure-only device would release — so a purely pressure-triggered device can let a cylinder fail before it ever opens. A fusible burst disc carries a metal element that melts at a set temperature, venting the cylinder deliberately while its wall is still sound. Requiring it to rupture on excess pressure or excess temperature, individually or combined, covers both failure paths, and manifolding every disc to a common vent header means whatever is released goes somewhere chosen rather than wherever it happens to point.

Q · 05 What is the 4 g frame case, and why does it matter?

It is a structural calculation proving the frame, clamps and mountings hold the cascade together under four times gravity, with every cylinder in place and full — a stand-in for the braking, cornering and pothole loads a loaded trailer meets on a real road. It matters because the failure it guards against is not a leak but a cylinder coming loose in transit. It is required of stationary cascades too, but on a mobile one the frame is the primary safety component, which is why it is calculated, documented and inspected rather than simply fabricated.

Q · 06 Do you make the cylinders?

No. Cylinder manufacture and cascade engineering are different businesses, and we are in the second one. Cylinders come from approved cylinder manufacturers, made and hydrostatically tested to IS 7285 or the nominated composite standard, with certificates reviewed by the third-party inspector. What Neometrix engineers and builds is the cascade around them: the frame and its structural case, the manifold and pipework, valves, instrumentation and the safety and vent system, together with PESO/CCOE approval, BIS certification and inspection. That is where cascade reliability is won or lost, and it is what you are buying.

↗

Gas systems from Neometrix.

High-pressure gas storage, boosting, distribution and test equipment engineered at our Noida facility.

↗ Gas Systems

Nitrogen Gas Boosting Station

High-pressure gas boosting and cylinder charging.

↗ CNG Test

CNG High-Pressure Regulator Test Bench

Type-testing of CNG regulators at service pressure.

↗ Storage

Portable Liquid Nitrogen Container / Dewar

Vacuum-insulated dewars for cryogenic storage and transport.

Browse all Neometrix product lines.

Get a quotation

Send your cascade
duty and site.

The Projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — CNG cascades Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — CNG CASCADE SYSTEMS IS 7285 · ISO 11439 · IS 3224 ENGINEERED IN NOIDA · INDIA

Gas at 250 bar, held where the pipeline ends.

A compressor cannot fill a queue. Storage can.

Sized to the duty, not to a catalogue

Steel where mass is free, composite where it is not

Approvals carried as scope, not assumed

Store, move, and vent safely.

The Three-Bank Cascade

The Mobile Cascade

Manifold & Fittings

The Safety Train

Reference configuration, sized to your station.

Where cascades actually fail

One pressure discipline, several names.

Stationary Storage Cascade

Mobile Cascade — Type I

Mobile Cascade — Type IV Composite

Other Gases & Adjacent Equipment

Where it applies.

Common questions.

Gas systems from Neometrix.

Nitrogen Gas Boosting Station

CNG High-Pressure Regulator Test Bench

Portable Liquid Nitrogen Container / Dewar

Send your cascade
duty and site.

Similar Products

Share This Page

Gas at 250 bar, held where the pipeline ends.

A compressor cannot fill a queue. Storage can.

Sized to the duty, not to a catalogue

Steel where mass is free, composite where it is not

Approvals carried as scope, not assumed

Store, move, and vent safely.

The Three-Bank Cascade

The Mobile Cascade

Manifold & Fittings

The Safety Train

Reference configuration, sized to your station.

Where cascades actually fail

One pressure discipline, several names.

Stationary Storage Cascade

Mobile Cascade — Type I

Mobile Cascade — Type IV Composite

Other Gases & Adjacent Equipment

Where it applies.

Common questions.

Gas systems from Neometrix.

Nitrogen Gas Boosting Station

CNG High-Pressure Regulator Test Bench

Portable Liquid Nitrogen Container / Dewar

Send your cascadeduty and site.

Similar Products

Share This Page

Send your cascade
duty and site.