Small LH2 leak during transfer

A liquid hydrogen tanker had completed the off-loading at a customer’ site (metal manufacturer). The drivers were preparing to disconnect from the customer’ tank, when they noticed a small leak at the "T" connection at liquid line to liquid level gauge. They stopped the leak by forcing a small wooden stick into the opening. The drivers called the onsite company serviceman, who failed to repair leak. 2.50 hours later the company corporate office was called for assistance. The team arrived 4.50 hour later. After assessing situation, the team instructed the serviceman on how to repair line. The team explained the procedure to fire fighters and the police officials. The repair in the night to the following day.

INITIAL CAUSE was a leak on the liquid hydrogen line.
The ROOT CAUSE was probably the same, related to material failure. However, the company service at the customer site had not been able to repair the leak, what speak for a need to improve procedures training.

pipe connection

The drivers stopped the leak by forcing a small wooden stick into the opening. Unclear if this was successful to reduce/stop the leak.
After that the on-site company serviceman had not been able to repair, the company team arrived from the head quarter succeeded, approximately 9 hours later.

The fact that company service at the customer site had not been able to repair the leak, probably indicates that procedures training could be improved.