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 End of Hypactor project: Providing recommendations regarding the qualification of composite high pressure hydrogen vessels


 The contribution of Institut de Soudure in this project is mostly concerned with establishing an efficient Acoustic Emission (AE) procedure, able to identify vessels with compromised burst pressures due to impact.

The main objective of HYPACTOR (www.hypactor.eu) is to provide recommendations for Regulation Codes and Standards (RCS) regarding the qualification of new designs of composite overwrapped pressure vessels (COPV) and the procedures for periodic inspection in service of COPV subjected to mechanical impacts.

​Following the workshop on 19th June, 2017 Paris, you can watch a replay on YouTube: http://bit.ly/2usP0jb

All the presentations and recommendations are available to download here:

Contribution of Institut de Soudure

The contribution of Institut de Soudure in this project is mostly concerned with establishing an efficient Acoustic Emission (AE) procedure, able to identify vessels with compromised burst pressures due to impact.

The following approach is used: combine several AE tests on healthy and impacted vessels and correlate the results with burst pressures. The criteria were first built on 143L transportable Type IV vessels, and then applied for a wide database of Type IV vessels with different sizes, design specifications and working pressures. The validation was carried out on 114 hydraulic tests on healthy and impacted vessels. The methodology developed, is able to distinguish CPVs with unacceptable damage. Results have proven to be relevant whatever the service life between the occurrence of impact and the AE control.

This project was also an opportunity to apply and evaluate, for the first time in Europe, periodic inspection using Modal Acoustic Emission technology (draft ISO DIS19016) and to provide recommendations directly to the ISO/TC58 /SC4/WG15. A summary of the main developments and results was discussed during the workshop.

More about HYPACTOR

Hydrogen is expected to be a highly valuable energy carrier for the 21st century as it should participate in answering main societal and economical concerns. However, in order to enable its extensive use as an energy vector, it is of primary importance to ensure its societal acceptance and thus its safety in use.

To this aim, hydrogen storage and transportation must be secured. In particular today, the knowledge on composite overwrapped pressure vessels’ (COPV) behaviour when submitted to mechanical impacts is limited and existing standards are not well-appropriate to composite materials.

Experimental work has been combined with feedback from experience in order to:

- Understand and characterize the relationship between the impact, the damage and the loss of performance of COPV at short term and after further pressure loads in service;
- Develop models to predict at least short term residual performance of the impacted COPV;
-  Assess relevant (non-destructive) inspection procedures and define pass-fail criteria for COPV in service subjected to mechanical impacts.

The HYPACTOR project, supported by the European Union’s seventh framework Programme for the Fuel cells and hydrogen (FCH) joint technology initiative, brings together partners with complementary expertise: experts in testing processes for compressed gaseous hydrogen (CGH2) storage in full composite vessels (CEA, WRUT), a gas company operating CGH2 technologies (AIR LIQUIDE), a pressure vessel supplier (HEXAGON), experts in characterization, particularly non-destructive testing (Institut de Soudure Association, WRUT) and experts in modelling (NTNU), leading actors in international RCS development (HEX, AL, Institut de Soudure Association, CEA), and an expert in European R&D collaborative project management (ALMA).

Start date: Tuesday, April 1, 2014
End date: Friday, June 30, 2017
Duration: 36 months (originally), extended to 39 months
Project cost: M€ 4,05
Project funding: M€ 2,14
Coordinator: CEA, France

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