Accumulation Testing Systems

Working under atmospheric pressure, accumulation testing using hydrogen has many advantages. Mitigating the need for helium while hitting the required sensitivity.

Sniff Testing Systems

Sniff testing using hydrogen can be an alternative to accumulation testing without the requirement for large chambers and pumps. Ideal for leak location.

Vacuum Chamber Leak Test Systems

With any hard vacuum leak test, hydrogen can be used as an alternative gas to helium. This is often used in applications with multi-loop systems. Hydrogen tracer gas can be used.

Hydrogen Fuel Cells

VES have developed the most efficient and effective methods for leak testing fuel cells. Using an aluminium chamber design with a volume optimised solution and state of the art tooling, all fuel cells can be leak tested to industry standards.

Hydrogen fuel cells are used in many modes of transport, including cars, buses, lorries and boats. Bespoke leak detection equipment from VES is tailored to your every need.

Fuel cells are made up of multiple layers of material, including an Anode, Cathode and Electrolyte. Any leakage from these sealed layers can be detrimental to the performance of the cells. Common testing methods of fuel cells include pressure drop and pressure rise. Both these methods have significant disadvantages in production for repeatable and reliable results. Most cells have small volumes and thin walls, therefore sealing repeatability can be difficult. Using the pressure rise/drop method of leak testing has inconsistent results. With similar comparisons being drawn from the fuel systems and medical device industries many years ago, Vacuum Engineering Services have installed hard vacuum and accumulation machines to increase reliability and stay up to date with standards and regulations as production increases.

To ensure leak tightness of the cells and optimise performance, a helium leak test can be carried out. Legalisation and best practice require parts to be tested to 2 x 10-4mbar.l/sec.

Vacuum Engineering Services have designed machines for both cells and modules for Hydrogen and Methane Fuel Cells. Delivering optimum performance and preventing harmful gases escaping to the atmosphere. Feel free to contact us to discuss further.

Hydrogen Tanks

VES have developed the best in class leak detection machine to meet all the demands of testing high pressure hydrogen tanks. Using the knowledge and experience from over 30 years of manufacturing leak detection equipment, VES have developed a unique quantitative leak test for all high pressure tanks.

As the world moves away from internal combustion engines and traditional fuel tanks; high pressure hydrogen tanks are the new energy storage. VES have designed a number of machines for Hydrogen fuel tanks. As these tanks work at extremely high pressures and high volumes, leak testing comes with some very unique challenges that can be broken down into three different areas:

  • The potential energy can have catastrophic implications on the surrounding areas. Leak testing these Category 4 tanks creates great safety challenges for the industry moving forward.

  • With this high pressure and high-volume combination manufacturers are seeing increased costs in testing gases.

  • The gas composition changes over the course of the leak test with moisture and temperature changing dramatically under compression and venting.



Vacuum Engineering Services have worked with their partners to create the new H2Safe solution. Combining all the history and experience in a leak test station with new high-pressure boosting/recovery systems and safety containment systems.

H2 Safe Solution

At VES we have designed a full package of machines to meet all the requirements for leak testing these high-pressure tanks. Starting with a vacuum drying station to meet stringent moisture content requirements. Moving on to a fully automated accumulation machine with built in point detection to meet the required leak rates and cycle times.

Accumulation machines work in atmospheric conditions using either forming gas or tracer gas; working without a vacuum chamber an accumulation tester provides accurate, repeatable and reliable results at relatively low cost. While VES have also introduced different testing gases, been able to provide a solution that is up to 94% cheaper per test piece than traditional 100% helium.

A unique design, developed in house at VES, specifically for high pressure applications (including Hydrogen and CNG tanks). The H2 Safe machines have been designed to incorporate three different elements:

  • A leak test

  • Pressure generation

  • Pressure containment



With everything we do at Vacuum Engineering Services, safety is our highest priority. Maintaining the highest of standards throughout our facilities. All pressure vessels included hydrogen tanks and fuel cells must meet the global regulations. Vacuum Engineering Services have experience in meeting all EU and global standards. Feel free to contact us to discuss further.