NMX‑GASS‑200 / Rev 00 / 2.0 kg/s · 4 kg/cm² ±0.35 / Noida · India 2026 · Product Page

NMX-GASS-200 · ENGINEERED TO ORDER — ENGINE TEST FACILITY AIR SYSTEMS

Store slowly. Spend at two kilograms a second.

Name: Ground Air Supply Station (GASS) for Engine Test Cells
Brand: Neometrix

A turnkey ground air supply station for gas-turbine engine test cells — a screw-compressor plant that charges an open-yard air storage farm to 13 kg/cm² in 20 minutes, then blows it down to the test article at 2.00 kg/s, regulated to 4 kg/cm² ±0.35, five starts back-to-back — dry to −65 °C dew point, oil below 0.01 ppm, with an independent oil-free instrumentation air system alongside. Engineered to order — no delivered station is claimed on this page.

Enquire — test facility air Capability sheet (PDF)

Illustrative image, not a delivered installation — the open-yard air storage farm of a ground air supply station: a row of large vertical welded air receivers on concrete plinths behind a mesh fence, connected by stainless headers, with a plain equipment building and pipe rack running toward a test cell block in the background

Fig · 01 The storage farm — average power banked as peak flow — illustrative, not a delivered installation

Mass flow

2.0kg/s

Regulated

4kg/cm² ±0.35

Farm fill

20minutes

Starts

5back-to-back

Dryness

−65°C dew point

ISO 9001 / 14001 Engineered to order Compressor FAT at works Performance demonstration in scope Noida · India

Overview

The engine drinks faster than any compressor breathes.

A gas-turbine test article swallows air on a scale no sensible compressor plant can deliver live: 2.00 kg/s of conditioned, regulated air — made in real time — would be a megawatt-class machine that idles between tests. The station solves it the way every good high-demand system does: store slowly, spend fast. Average power in, peak flow out.

Illustrative image, not a delivered installation — the compressor room of a ground air supply station: three packaged screw compressor units in plain grey enclosures in a row, each with its vertical air receiver and a twin-tower desiccant drier beside it, connected by overhead stainless pipework in a clean plant room

Fig · 02 Two working, one standby — each stream with its own receiver and drier — illustrative, not a delivered installation

The fill loop: three screw compressors — two working, one standby — each good for ≥13 kg/cm²(g) and ≥36 m³/min of free air at the hardest honest ambient (40 °C and 100 % humidity together), each through its own 5 m³ receiver, filtration and blower-reactivation drier, charging the open-yard cylinder farm from zero to 13 kg/cm²(g) inside 20 minutes on no more than 700 kW.

The spend loop: the test article is fed from storage, one cell at a time, through regulation that holds 4 kg/cm²(g) within ±0.35 while the farm pressure falls — two minutes of continuous 2.00 kg/s per start, five starts in succession with two-minute gaps, and the article’s inlet never drops out of band. One compressor keeps replenishing throughout, running on an islanded site generator at no more than 400 kW without disturbing its frequency.

The compressors make the air. The station makes the promise: the same pressure, at the same flow, on the fifth start as on the first.

Engineered to Order

Quoted against a live campus requirement

This configuration was quoted against an Indian defence research establishment’s engine-test campus — a turnkey scope from design and sourcing through integration with a pair of test cells to performance demonstration. No delivered station is claimed; compressor count, storage volume and layout are settled by design calculation.

Proven Before Despatch

Compressor FAT at the maker’s works

The 20-minute fill promise lives or dies on real compressor performance, so factory acceptance testing — rated pressure, flow and shaft power demonstrated at the works — is carried in the scope before anything ships, and the performance demonstration is repeated on site, integrated, at handover.

Two Utilities, One Station

Instrument air stays alive while main air is spent

A separate instrumentation air system — two reciprocating, non-lubricated, oil-free, water-cooled compressors at ≥40 kg/cm²(g) and ≥150 CFM each, with their own driers, filters and storage — so the gauges keep reading precisely when the main farm is roaring down.

Architecture

One farm, two loops.

The schematic below shows the fill loop that banks the air and the spend loop that delivers it — and the detail panel shows the second, quieter utility that keeps the instruments breathing.

FIG · 03STATION ARCHITECTURE · FILL LOOP · STORAGE FARM · REGULATED BLOW-DOWN · INSTRUMENTATION AIR

Fig · 03 Average power becomes peak flow: filled in twenty minutes at 700 kW, spent at 2.00 kg/s — with the islanded generator carrying only the replenishing compressor

Arc · 01

The Fill Loop

Three screw compressors, two duty + one standby, sized at the honest ambient corner — 40 °C and 100 % RH simultaneously, because a compressor rated on a pleasant day lies about the monsoon. Each stream owns its 5 m³ receiver, filter and blower-reactivation drier, so moisture is dealt with before storage, not after.

Arc · 02

The Storage Farm

A minimum of four air storage cylinders in the open yard, charged 0 → 13 kg/cm²(g) within 20 minutes. The farm’s volume is the design’s central calculation: it must bank enough air that five successive two-minute, 2.00 kg/s draws never pull the regulated supply out of its ±0.35 band.

Arc · 03

Regulated Blow-Down

Supply runs from storage through regulation to 4 kg/cm²(g) ±0.35 at 2.00 kg/s, filtered, ≤50 °C, −65 °C dew point, oil <0.01 ppm, down ~200 m of stainless line to the article — holding band while the upstream pressure falls continuously, which is the hard part of the whole station.

Arc · 04

Controls & the Island Constraint

A redundant PLC selects compressors and cylinders and shares monitoring with the test cells’ facility control system through dedicated junction panels. During test runs, the replenishing compressor and its drier start and run on an islanded generator at ≤400 kW — an electrical design proven by calculation and demonstration, not assumed.

Have an engine test cell, blow-down air or facility utility requirement? Send it across — clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference station, sized to your test cell.

The parameters below describe the reference twin-cell station. Compressor count, storage volume, supply duty and layout follow from the article’s air demand, the test cadence and the site’s power.

Illustrative image, not a delivered installation — the control side of a ground air supply station: two grey electrical control cabinets with blank HMI screens beside a pressure regulation skid carrying valves, a filter housing and gauges with plain faces, with a large-bore stainless pipe run leaving the room on an overhead rack

Fig · 04 Redundant control and the regulation skid — where ±0.35 is held — illustrative, not a delivered installation

Where blow-down stations actually fail

On the fifth start, not the first. A farm sized for one heroic demonstration passes its commissioning and then starves the test programme — the fourth start begins from a lower shelf, the regulator runs out of upstream authority, and the article’s inlet sags out of band mid-test.

That is why the five-start duty is the design’s spine, why the farm volume is a submitted calculation rather than a brochure line, and why the compressors’ true delivered flow is proven at the maker’s works before despatch. A blow-down station is a promise about the last start; everything on this page is arranged to keep it.

Full specification — expand

Station	Ground air supply station (GASS) + instrumentation air compressor (IAC) system — turnkey: design, engineering, sourcing, fabrication, supply, installation, integration with a pair of engine test cells, commissioning and performance demonstration
Supply Duty	2.00 kg/s mass flow at 4 kg/cm²(g) regulated, held ±0.35 · 2-minute continuous cycles · five successive supplies with 2-minute gaps, article inlet never out of band · alternate duty 2.00 kg/s at 8 kg/cm²(g) with storage held at 13 · one cell supplied at a time
Air Quality	Temperature ≤50 °C at the article · oil content <0.01 ppm · dryness −65 °C atmospheric dew point · delivery through final filtration
Fill Performance	Storage farm charged 0 → ≥13 kg/cm²(g) within 20 minutes on two compressors · grid draw ≤700 kW · farm volume and fill duration submitted as design calculations
Compressor Plant	3 × screw compressors (2 working + 1 standby) · each ≥13 kg/cm²(g) delivery, ≥36 m³/min FAD at 0.935 kg/cm²(abs) ambient, wet-bulb 22 °C, design 40 °C with 100 % RH simultaneously · FAT at the maker’s works: rated pressure, flow and shaft power demonstrated before despatch
Per-Stream Conditioning	5 m³ local receiver per stream · filtration · blower-reactivation desiccant drier per stream, ahead of storage
Storage Farm	Air storage cylinders, minimum 4, in the open yard on plinths · interconnecting SS headers · sized so the five-start duty never pulls the regulated supply out of band
Islanded Operation	During supply, one compressor + its drier replenish storage on an islanded site generator at ≤400 kW · electrical design in the builder’s scope, submitted for approval and proven not to droop frequency or trip the set · total power budgets (grid + generator) submitted with break-up
Distribution & Works	~200 m one-way SS piping and fittings from the equipment enclosure to the test article · equipment enclosure constructed by the builder · power tapped from an adjacent building through underground trenches to IS electrical norms
Controls	Redundant PLC control system · operator-selectable compressors and storage cylinders · monitoring/control signals shared with the test cells’ facility control system via dedicated junction panels, one per cell
Instrumentation Air (IAC)	2 × reciprocating compressors, non-lubricated, water-cooled, oil-free · each ≥40 kg/cm²(g) and ≥150 CFM FAD at the same ambient basis · driers, filters, storage cylinders, pressure-control and shut-off valves, safety relief, SS piping, PLC and panels · an independent utility, alive while the main farm is spent
Acceptance	Compressor FAT at works · installation and integration at site · commissioning and performance demonstration of the complete station against the supply duty · documentation and training
Sourcing	Screw and reciprocating compressors are proprietary machines from established makers, FAT-proven · Neometrix engineers the station: storage farm, receiver/drier/filter trains, regulation, ~200 m distribution, enclosure, redundant controls and facility-system integration, electrical design and commissioning
Status	Engineered to order — reference configuration, not yet built · quoted against a defence engine-test campus requirement · compressor count, storage volume and layout settled at design review

PDF · 1 page

Ground Air Supply Station — Capability Sheet

Tender Response

Send your specification — compliance matrix in two working days

Variants

One discipline, four air systems.

Tenders call this a ground air supply station, a blow-down facility, a test-cell air system or plant air augmentation. The discipline — bank average power, deliver peak flow, hold the band — is common to all of them.

Var · 01

Engine Test Cell GASS

The reference configuration — compressor plant, open-yard storage farm, regulated blow-down to the article, facility-control integration, built and demonstrated as one station.

Var · 02

Instrumentation Air Systems

Oil-free reciprocating plants with their own storage and conditioning — the clean, independent utility for instruments, actuators and purge duties, supplied alone or alongside a main station.

Var · 03

Blow-Down Storage Farms

High-volume air storage with regulated discharge for wind tunnels, ejector systems and short-duration high-flow test duties — the farm and regulation without the full station scope.

Var · 04

Test-Cell Utility Integration

Enclosures, distribution pipework, trenched power, junction panels and facility-control interfacing — the works that turn separate machines into one commissioned facility.

Applications

Where it applies.

Wherever a test needs more air than a compressor can make in the moment.

A · 01Gas-turbine engine test cells — article air supply and starts

A · 02Altitude & component test facilities — blow-down air services

A · 03Wind tunnels & ejector systems — stored-air drive and augmentation

A · 04Instrumentation & control air for test campuses — oil-free utilities

A · 05Plant air augmentation where short peak demands dwarf average load

A · 06Research establishments & production test beds — facility air turnkeys

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Why store air at all — why not just a bigger compressor?

Arithmetic. Delivering 2.00 kg/s of conditioned air live — roughly a hundred cubic metres a minute of free air — would demand a compressor installation in the megawatt class, running flat out during a two-minute test and idle the rest of the day. Storage inverts the economics: two 36 m³/min machines drawing no more than 700 kW fill the farm in twenty minutes, and the farm then releases that banked energy at whatever rate the article demands. It is the same principle as a cascade at a gas filling station, applied to flow instead of fills: what matters is not how fast you can make air, but how much you have ready and how steadily you can let it go. The price is the design discipline downstream — regulation that stays in band while the shelf it stands on falls.

Q · 02 What makes holding ±0.35 kg/cm² at 2 kg/s hard?

The upstream side never holds still. As the article draws, farm pressure falls continuously from 13 kg/cm² toward the supply setpoint, so the regulation stage sees a shrinking differential at a very large flow — and must keep the downstream leg inside a ±0.35 band the entire time, without hunting, through five successive draws that each start from a lower shelf than the last. That drives the sizing of the regulation train and the farm volume together: too small a farm and the final start runs out of differential; too coarse a valve and the band is lost in transients at the start of each draw. It is why the specification demands the calculation up front — farm volume, start count, draw-down curve — rather than accepting a nameplate.

Q · 03 Why must the air be dried to −65 °C dew point?

Because everything downstream of the drier conspires to find water. The line to the article runs a couple of hundred metres, partly outdoors; every regulation stage cools the air as it expands; and the article itself is precision machinery instrumented to fine tolerances. Air that seemed dry at the compressor will shed condensate in a cold pipe and frost at a valve seat as pressure drops — and a slug of water or ice arriving with 2 kg/s of air is not a nuisance, it is a projectile. Drying to a −65 °C atmospheric dew point before storage, with a blower-reactivation drier on every compressor stream, means there is nothing left to condense at any temperature the system will ever see. The oil limit — below 0.01 ppm — follows the same logic: the test article is the customer, and its innards are not a place for compressor oil.

Q · 04 What is the islanded-generator constraint about?

During a test run the campus deliberately isolates the cell’s power on a site generator, and grid power is unavailable — yet the station must keep one compressor and its drier running to replenish storage between starts. Starting large motors on an islanded generator that is already carrying most of its load is a classic way to droop frequency and trip the set, taking the test down with it. So the specification makes the electrical design a first-class deliverable: the replenishing compressor and its auxiliaries must draw no more than 400 kW, start softly enough not to disturb the island, and the design is submitted for approval and proven in demonstration. It is a reminder that a facility air system is as much an electrical machine as a pneumatic one.

Q · 05 Why does instrument air get its own compressors?

Because the moment the main farm is being spent is exactly the moment the instruments matter most — and instrument air has different needs than article air. It must be absolutely oil-free at the source, which is why the instrumentation air system uses non-lubricated reciprocating compressors rather than tapping the main screws; it must be available continuously, not in blow-down pulses; and it must survive the main system’s worst day. Two water-cooled, oil-free machines at ≥40 kg/cm²(g) and ≥150 CFM each, with their own driers, filters, storage and relief, make it a genuinely independent utility — small, quiet, and deliberately unimpressed by whatever the big farm is doing.

Q · 06 Do you build the compressors?

No. Screw and oil-free reciprocating compressors are proprietary machines from established makers, and the specification treats them that way — including a factory acceptance test at the maker’s works where rated pressure, flow and shaft power are demonstrated before anything ships, because the 20-minute fill promise depends on real delivered flow rather than catalogue optimism. What Neometrix engineers is the station: the storage farm and its headers, the receiver, drier and filter trains on every stream, the regulation that holds the band, two hundred metres of stainless distribution, the equipment enclosure, the redundant PLC and its integration with the test cells’ facility control system, the electrical design for the islanded case, and the commissioning and performance demonstration that prove the whole. To be plain about status: quoted against a live campus requirement; no delivered station is claimed on this page.

↗

Test facility engineering from Neometrix.

Engine test, compressed air and pressure systems engineered at our Noida facility.

↗ Engine Test

Hydrogen Piston Engine Test Bench

Engine R&D testing — the cells this station feeds.

↗ Clean Air

Dry Oil-Free Compressed Air System

Purity-led laboratory air — the bench-scale sibling.

↗ Regulation

Pressure Reducing Panel — HP Air

Regulated let-down — the discipline that holds the band.

Browse all Neometrix product lines.

Get a quotation

Send your article’s
air demand curve.

The Defence Programmes 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 — test facility air Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — ENGINE TEST FACILITY AIR SYSTEMS 2.0 kg/s · 4 kg/cm² ±0.35 · FIVE STARTS ENGINEERED IN NOIDA · INDIA

Store slowly. Spend at two kilograms a second.

The engine drinks faster than any compressor breathes.

Quoted against a live campus requirement

Compressor FAT at the maker’s works

Instrument air stays alive while main air is spent

One farm, two loops.

The Fill Loop

The Storage Farm

Regulated Blow-Down

Controls & the Island Constraint

Reference station, sized to your test cell.

Where blow-down stations actually fail

One discipline, four air systems.

Engine Test Cell GASS

Instrumentation Air Systems

Blow-Down Storage Farms

Test-Cell Utility Integration

Where it applies.

Common questions.

Test facility engineering from Neometrix.

Hydrogen Piston Engine Test Bench

Dry Oil-Free Compressed Air System

Pressure Reducing Panel — HP Air

Send your article’s
air demand curve.

Similar Products

Share This Page

Store slowly. Spend at two kilograms a second.

The engine drinks faster than any compressor breathes.

Quoted against a live campus requirement

Compressor FAT at the maker’s works

Instrument air stays alive while main air is spent

One farm, two loops.

The Fill Loop

The Storage Farm

Regulated Blow-Down

Controls & the Island Constraint

Reference station, sized to your test cell.

Where blow-down stations actually fail

One discipline, four air systems.

Engine Test Cell GASS

Instrumentation Air Systems

Blow-Down Storage Farms

Test-Cell Utility Integration

Where it applies.

Common questions.

Test facility engineering from Neometrix.

Hydrogen Piston Engine Test Bench

Dry Oil-Free Compressed Air System

Pressure Reducing Panel — HP Air

Send your article’sair demand curve.

Similar Products

Share This Page

Send your article’s
air demand curve.