CAGE Code 6TL87 | DUNS 015210349

Hydrostatic Testing

Axenics specializes in hydrostatic testing, otherwise known as hydro testing, DOT specifications 4B 260 and 4B 300 low-pressure, stainless-steel chemical canisters.

DOT Specifications

In order to meet Department of Transportation (DOT) Pipeline and Hazardous Materials Safety Administration (PHMSA)specifications, stainless steel cylinders must be tested every 3, 5 or 10 years by a DOT-approved hydrostatic testing facility. The time frame for requalification testing is dependent upon the age and construction of the cylinder, the gas it contains, and the rating of the cylinder by the original equipment manufacturer (OEM).

DOT- Approved to Test, Repair & Rebuild

Our team of experts is qualified to test, inspect, certify, repair and/or rebuild low-pressure stainless-steel cylinders to meet the strict standards set forth by the DOT PHMSA, and in accordance with CGA (Compressed Gas Association) Methods for Hydrostatic Testing of Compressed Gas Cylinders. We hold the following DOT Stainless Steel Cylinder Approval:

  • RIN#: 1550, expires 6/19/2020
  • K#: KI33, expires 6/19/2020
  • M#: M6329, expires 3/9/2020
  • Cylinder Type: 4B260 + 4B300

Equipment Used

Axenics uses a state of the art hydrostatic tester to perform all requalification hydro tests. The stainless steel cylinders are examined for leaks, and the overall integrity of the unit is assessed. Axenics’ hydrostatic tester measures the rate of expansion of the tube under water pressure, and determines whether the unit can safely hold the amount of pressure it is rated for. We also laser etch our certification number on your cylinders for easy identification for the years your tanks are now certified.


Avoid Disasters

Hydrostatic testing is the most accurate way to test pressure vessels including pipelines, plumbing, and chemical cylinders for potential leaks. The hydro requalification testing process is critical for preventing outdated containers from rupturing due to loss of structural integrity.

Avoid Penalties

Our highly-qualified testers use a simple and accurate hydrostatic testing process to help chemical, industrial, and other companies involved in transporting hazardous materials to avoid potential penalties and dangers associated with transporting outdated and/or weak cylinders.

Hydrostatic Testing Q&A

What is hydro testing?

Hydro testing, also called hydrostatic testing, involves checking a canister, vessel or component to determine its integrity by measuring the rate of expansion using water pressure. The test will evaluate the strength and durability of welds to ensure that they can withstand extreme pressures and loads when the product is placed into operation. It can also be used to determine just how much pressure the vessel can withstand before failing.

What is hydro testing used for and why is it required?

Any type of equipment that will hold products such as water, gas or chemicals that has undergone repair work can be hydro tested before being placed back into service. So storage tanks, pipelines, and even fire extinguishers should be hydro tested. For some canisters and pipelines, hydro testing will be required in accordance with the Department of Transportation’s (DOT) Pipeline and Hazardous Materials Safety Administration (PHMSA) standards to receive recertification. Hydro testing recertification may be required every 3, 5, 10 or 12 years.

How do you hydro test a pressure vessel?

Dye is placed into water, or another liquid, as the water is pumped into the cylinder or pipe. The pressure inside the cylinder will rise to a specified level and then be set at that pressure for a certain length of time. The hydrostatic testing will measure the pressure expansion rate as technicians will look for any leaks or component failures.

How do you determine the hydro testing pressure?

The hydro test pressure will be specific to the type of vessel that will be experiencing the testing as well as its components. The pressure can go up to 1.5 times the designed working pressure, or the pressure should not exceed the yield strength (the amount of stress toward the vessel where it begins to deform) of the test temperature. DOT vessels and canisters will have a certification rating marked on them regarding pressure limits.

How can hydrostatic testing help avoid disasters?

Vessels can crack, leak or even explode when going through high pressures, loads and other stresses. These situations can cause terrible disasters that can impact the health and safety of workers in an OEM manufacturing facility. It can also create environmental hazards if caustic or flammable liquids escape. Hydrostatic testing ensures that rebuilt or repaired vessels are up to quality standards and meets recertification. Hydrostatic testing can also help companies avoid costly fines and penalties.

Where can I hydro test my tank or canister, and can hydro testing be outsourced?

Hydro testing tanks and canisters must be done at a certified hydrostatic testing facility that is compliant with all DOT PHMSA requirements. The facility may be certified to test one rating type of canisters or several different canister ratings. An OEM manufacturer can obtain certification to perform hydro testing on their own. Yet it may be in their best interest to outsource the work as companies can save money on labor and equipment purchases. Also, if the testing doesn’t meet DOT recertification standards, the company can face penalties as well as place their workers at risk from cylinder or pipe failure.

What’s the difference between a hydro test, a service test, and a pressure test?

There are many terms that you will hear when it comes to testing storage containers and cylinders. Axenics has taken the most used terms and provided explanations so you will know the difference and be able to get the right testing performed.

Hydro test: tests the integrity of the tank under high pressure to measure how much it expands.
Pressure test: testing the cylinder or container to check for leaks, cracks and other possible issues.
Service test: places the cylinder or vessel through regular operational testing to ensure it works effectively.

Learn more about hydro testing by contacting Axenics. We have state of the art hydrostatic testing equipment and are a certified and approved DOT testing facility.

Protecting your investment

Learn why testing is part of every job we perform

Download Now
Working with a manufacturer outside your zipcode