Fire Extinguisher Hydro Test Explained
A hydro (hydrostatic) test checks that the extinguisher cylinder can still safely hold its pressure. Here is why it matters, how to know when it is due, how it is done and what it costs in Pune.
A Pressure Test for the Cylinder
Refilling replaces the extinguishing agent. A hydro test is different: it tests the cylinder itself. The empty cylinder is filled with water and pressurised above its normal working pressure in a test rig. If it leaks or stretches permanently, it has failed and must be taken out of service.
It is due every 2, 3 or 5 years depending on the type of extinguisher (see the table below), and the last test date is marked on the cylinder or in the service record. During the yearly service we check these dates and tell you which cylinders are due. A cylinder that is dented, rusted or has been through a fire should be tested before it is used again, whatever the date.
How Often: Hydro Test Intervals
| Extinguisher type | Hydro test |
|---|---|
| Foam (AFFF), water and water mist | Every 2 years |
| ABC powder, K-Type kitchen and clean agent | Every 3 years |
| CO₂ | Every 5 years |
| Lithium-ion, modular and other types | As per the manufacturer |
The last test date is marked on the cylinder or service tag. Set a free reminder so you do not miss it.
Why Cylinders Are Tested
Cylinder safety
An extinguisher is a pressure vessel. Rust inside or metal fatigue cannot be seen from outside — the test finds it.
Reliable discharge
A cylinder that holds pressure is one that will discharge properly when it is needed.
Records & audits
Test dates are part of the extinguisher record that auditors, insurers and Form B inspections look at.
Hydro Testing at FIRENET
Pickup
Free pickup from your site in Pune and PCMC, with a list of every cylinder collected.
Empty & inspect
The extinguisher is discharged safely, the valve removed and the cylinder inspected inside and out.
Pressure test
The cylinder is filled with water and pressurised above its working pressure, then checked for leaks and permanent deformation.
Dry & refill
Cylinders that pass are dried, refilled with fresh agent and re-pressurised.
Tag & return
A fresh seal and tag with the test date, and the extinguisher is returned to its place.
Rates: hydro test from ₹100; CO₂, lithium-ion and 45 L foam from ₹350; GST 18% extra. See all refilling and hydro test rates.
Frequently Asked Questions
Every 2 years for foam, water and water mist; every 3 years for ABC powder, K-Type kitchen and clean agent; every 5 years for CO₂. Other types, such as lithium-ion and modular units, follow the manufacturer. The last test date is marked on the cylinder or service record, and we tell you when it is due during the annual service. A cylinder that is damaged, corroded or has been through a fire should be tested before it is used again.
Hydro testing starts from ₹100, and from ₹350 for CO₂, lithium-ion and 45-litre foam extinguishers. GST 18% is extra. Refilling is charged separately.
It is condemned and must not be refilled or used. We tell you before anything else is done and quote a suitable replacement.
Yes. Pickup and drop is free across Pune and PCMC. For Chakan, Talegaon and Ranjangaon MIDC, please call to confirm.
What Our Clients Say
Hydro test and refilling with free pickup
Pune & PCMC — we collect, test, refill and return with fresh tags.