For this purpose metallic materials have to be tested to demonstrate safe use with hydrogen. Kiwa performs hydrogen embrittlement tests according to the ISO 11114-4’s disc method to demonstrate this hydrogen compatibility.
Originally, the ISO 11114-4 was intended as a quality standard for the transport of potentially dangerous substances in gas cylinders. For example, the standard provides guidelines and includes methods for testing the resistance of cylinders to hydrogen embrittlement. Method A, also known as the disc method, is one of the test methods specified in this standard for evaluating the susceptibility of metals to hydrogen embrittlement. The hydrogen and material testing experts of Kiwa have applied the ISO 11114-4 Method A – Disc Method to the testing of the hydrogen compatibility of tanks and components for hydrogen vehicles.
Widely recognized test method
The disc method is widely used and recognized as a reliable test method for evaluating the susceptibility of metals to hydrogen embrittlement. In summary, the disc method is a standard test method used to evaluate the resistance of materials to hydrogen embrittlement. In the disc method, a small, flat disc of the material is placed between two stainless steel flanges. The pressure is increased from one side of the disc with different pressure-rise rates until rupture.
The rupture test is carried out with both helium gas and hydrogen gas. The rupture pressures are compared. The ratio between these pressures is an indicator for hydrogen compatibility. The lower the ratio, the less susceptible the steel will be to embrittlement
Kiwa’s alternative fuels and pressure products experts have a lot of expertise in certification and testing for hydrogen applications. We offer service quick responses to client requests and the possibility for a weekly update on testing. We work closely together with Dutch vehicle type approval and registration authority RDW, its German counterpart KBA and Japanese KHK and can also test according to North-American standards.