Tesein has worked in fire protection for more than forty years from Arteixo near A Coruña, covering industrial and naval projects, with fire safety as its sole business line rather than one branch of a general installations contractor. Its authorisations page publishes Calificación CEPREVEN number 16/050, covering automatic water extinction by sprinklers for both ordinary and extra risk together with automatic detection, alongside its RIPCI habilitación as an installing and maintaining company under RD 513/2017. It also holds recognition from Lloyd’s Register, Bureau Veritas, ABS, DNV and Germanischer Lloyd for marine work, and registrations for fluorinated gases and pressure equipment. Its ISO certificates are held but are not the fire evidence.