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Hydrostatic Test Bench / Compressed Gas Cylinder Proof-Pressure & Leak Test / IS 5844 · MIL-STD / Noida · India
HYDROSTATIC TEST BENCH · UP TO 3000 BAR GAUGE

Hydrostatic Test Bench, cylinder proof-pressure testing to 1.5× working pressure.

The Hydrostatic Test Bench is built for testing the strength and leaks of compressed gas cylinders. The cylinder is filled with a liquid, usually water, and pressurized up to 1.5 times its working pressure, with master pressure gauges installed as per IS:5844 requirements — a compact, repeatable proof-pressure and leak test station for CNG, industrial gas and defence gas cylinders.

Neometrix Hydrostatic Test Bench — pump skid, control panel and gas cylinder booster assembly
Fig · 01 Hydrostatic Test Bench · pump skid and control panel, as manufactured
Qualification testing supported to:
DEF STAN STANAG MIL-SPEC
Test Ratio
1.5× W.P.
Test Gauge
0–3000bar
FRL Supply
16bar / 230 psi
Burette
3600ml
Standard
IS5844
01
Overview

Every cylinder, proof-tested and leak-checked.

Reliable requalification of compressed gas cylinders requires a precision-engineered proof-pressure station — the Hydrostatic Test Bench validates cylinder strength, weld integrity and leak-tightness on real hardware, to a documented, gauge-traceable test pressure.

Hydrostatic Test Bench — twin pump-skid assembly with driving gas cylinders and pressure regulators
Fig · 02 Twin pump-skid assembly · driving gas cylinders and pressure instrumentation

The Hydrostatic Test Bench, developed by Neometrix, is built for testing the strength and leaks of compressed gas cylinders. The test involves filling the cylinder with a liquid — usually water — and pressurizing it to 1.5 times its working pressure. Master pressure gauges installed as per IS:5844 read and record the applied test pressure throughout the cycle.

Built around a compact air-driven pump skid, FRL-conditioned air supply, and a graduated burette for water-displacement measurement, the bench offers a repeatable, gauge-traceable hydrostatic stretch and leak test station for cylinder manufacturers, refilling stations and periodic statutory requalification facilities.

A cylinder proof-pressure and leak test bench that behaves like an automated hydrostatic testing machine — not a manually-gauged rig.

Every cylinder is pressurized to its specific 1.5× test ratio while the master gauge, working pressure gauge and burette reading are recorded for full traceability against the applicable cylinder specification.

02
Key Components

Six components, one test circuit.

From the ball valve and FRL air-supply conditioning through to the master test pressure gauge and displacement burette, every component is sized and rated for reliable, repeatable cylinder hydrostatic testing.

COMP · 01

Ball Valve

Working pressure 10 bar, 1/4″ BSPF end connection — isolates and directs the pressurizing circuit into the cylinder under test.

10 Bar · 1/4″ BSPF
COMP · 02

FRL Unit

Filter-regulator-lubricator conditioning the drive-air supply, rated up to 16 bar / 230 psi P1 max, protecting and regulating the pump's air input.

16 Bar · 230 PSI Max
COMP · 03

Working Pressure Gauge

0–16 bar working pressure gauge, 1/4″ NPTM end connection, 2-1/2″ dial — monitors circuit pressure ahead of the cylinder.

0–16 Bar · 2-1/2″ Dial
COMP · 04

MS-188 Pump

Air-driven intensifier pump — 1/4″ NPTF air inlet, 3/8″ NPTF liquid inlet, 1/4″ NPTF liquid outlet — generates the hydrostatic test pressure.

Air-Driven Intensifier
COMP · 05

Test Pressure Gauge

Master test pressure gauge rated 0–3000 bar, 1/4″ BSPPM end connection — the primary IS:5844 traceable reading during the 1.5× proof cycle.

0–3000 Bar · IS 5844
COMP · 06

Burette

3600 ml capacity graduated burette — measures water displacement/expansion during the hydrostatic stretch test for permanent-expansion evaluation.

3600 ml Capacity
03
Test Procedure

One cycle. Gauge-traceable throughout.

From cylinder mounting through pressurization and leak observation — the bench runs a controlled hydrostatic sequence with the master gauge reading recorded at every stage.

T · 01

Cylinder Fill & Purge

The compressed gas cylinder is connected to the test circuit and filled completely with water, purging trapped air before pressurization begins.

Water-Filled · Air-Purged
T · 02

Controlled Pressurization

The air-driven MS-188 pump raises internal pressure in a controlled ramp until the cylinder reaches 1.5 times its rated working pressure.

1.5× Working Pressure
T · 03

Master Gauge Hold & Read

Test pressure is held for the specified dwell period while the IS:5844 master pressure gauge and working pressure gauge are read and logged.

IS 5844 Master Gauge
T · 04

Expansion & Leak Check

The 3600 ml burette reading is taken to assess permanent volumetric expansion, and the cylinder body and valve are checked for leaks.

Burette Reading · Leak Check
T · 05

Controlled Depressurization

Pressure is released through the ball valve in a controlled manner, and the cylinder is drained before removal from the test fixture.

Ball Valve Vent Path
T · 06

Pass / Fail Recording

Test pressure held, permanent expansion and leak-check outcome are recorded against the cylinder identification for periodic requalification records.

Traceable Test Record
05
Downloads

Engineering design document.

Engineering design documentation for the Hydrostatic Test Bench, available as PDF.

06
Specifications

Technical parameters.

Machine TypeHydrostatic proof-pressure and leak test bench for compressed gas cylinders
Applicable StandardIS:5844 — master pressure gauges installed as per requirement
Test Ratio1.5× cylinder rated working pressure
Test MediumWater (or other suitable liquid)
Ball ValveWorking pressure 10 bar, 1/4″ BSPF end connection
FRL UnitP1 max 16 bar / 230 psi
Working Pressure Gauge0–16 bar, 1/4″ NPTM end connection, 2-1/2″ dial
PumpMS-188 — air inlet 1/4″ NPTF, liquid inlet 3/8″ NPTF, liquid outlet 1/4″ NPTF
Test Pressure GaugeWorking pressure 0–3000 bar, 1/4″ BSPPM end connection
Burette3600 ml capacity, graduated for expansion measurement
Key ComponentsMaster pressure gauges, cylinder valve interface, compressed gas cylinder fixture
07
Applications

Where it applies.

01CNG cylinder manufacturing and refilling station testing
02Periodic statutory hydrostatic requalification of gas cylinders
03Oxygen and nitrogen industrial gas cylinder testing
04Defence and industrial compressed gas cylinder qualification
05Fire extinguisher cylinder proof-pressure and leak testing
06Seamless gas cylinder manufacturer quality assurance per IS:5844
07Cylinder valve and fitting leak verification
08R&D and pilot-batch cylinder strength characterisation
09Third-party inspection and calibration laboratories
08
In Depth

The complete technical read.

Hydrostatic Test Bench — pump, gauges and pressure manifold detail
Fig · 03 Pump, master gauge and pressure manifold detail — drive-air and liquid ports

Why Hydrostatic Testing Matters

Compressed gas cylinders are pressure vessels that weaken gradually through repeated fill-discharge cycles, corrosion and mechanical stress. Hydrostatic testing is the standard method for verifying a cylinder can still safely hold its rated working pressure: the cylinder is filled with water and pressurized to 1.5 times its working pressure, well beyond normal service conditions, while master pressure gauges installed as per IS:5844 provide a traceable, calibrated reading of the exact test pressure reached.

Key Features

  • Master pressure gauges — IS:5844 traceable readout of applied test pressure
  • Compressed gas cylinder fixture — secure mounting for the cylinder under test
  • Cylinder valve interface — direct connection to the cylinder valve for fill, pressurize and vent
  • Air-driven MS-188 pump — generates hydrostatic test pressure without electrical intensifiers in the wetted circuit
  • Graduated burette — quantifies permanent volumetric expansion after the test cycle

Safety Notes

  • Test pressure ramp and dwell are controlled through the FRL-conditioned air supply to the MS-188 pump
  • Cylinder is fully water-filled and air-purged before pressurization to avoid a compressible-gas hazard during test
  • Ball valve provides a dedicated, controlled depressurization path at the end of each test cycle
  • Master and working pressure gauges should be periodically calibrated to maintain IS:5844 traceability
09
FAQ

Common questions.

Q01 What is the Hydrostatic Test Bench used for?
It is used for testing the strength and leaks of compressed gas cylinders. The cylinder is filled with a liquid, usually water, and pressurized to 1.5 times its working pressure, with master pressure gauges installed as per IS:5844 requirements.
Q02 What test pressure does the bench generate?
The bench pressurizes cylinders to 1.5 times their rated working pressure. The master test pressure gauge is rated to 3000 bar and the working pressure gauge on the control side is rated 0–16 bar.
Q03 What standard governs this test?
The bench is built around master pressure gauges installed as per IS:5844, the Indian Standard governing periodic hydrostatic testing of seamless gas cylinders, and can be configured to customer-specified and MIL-STD requirements for defence-supplied cylinders.
Q04 What is the burette used for?
The 3600 ml graduated burette measures the water displaced during the test, allowing the permanent volumetric expansion of the cylinder to be calculated and checked against the allowable limit.
Q05 What industries use the Hydrostatic Test Bench?
CNG and industrial gas cylinder manufacturing and refilling stations, oxygen and nitrogen cylinder requalification facilities, fire extinguisher cylinder testing, and defence and industrial gas systems requiring periodic statutory cylinder testing.
Q06 Is the Hydrostatic Test Bench customizable?
Yes, Neometrix offers customized versions tailored to specific cylinder sizes, working pressures, gauge ranges, and industry or customer-specified standards.
Q07 Who manufactures the Hydrostatic Test Bench?
Neometrix Engineering Pvt Ltd, Noida, India.

Ready to configure your test bench?

Discuss your cylinder sizes, working pressures, gauge ranges and standard alignment with our engineering team.

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Engineered To Standards Used In UK, NATO & U.S. Defence Procurement
DEF STAN (UK MoD)
NATO STANAG
RTCA/EUROCAE DO-160
MIL-SPEC / MIL-STD
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