Certificates & approvals
Please note that certificates issued before October 2017 still carry our former company name and will maintain their validity even after the renaming of our company.
API 5L / API 5CT
- API 5L, English (valid until 04/2026)Siegen plant
- API 5CT, English (valid until 04/2026)Siegen plant
- API 5L, English (valid until 04/2026)Hamm plant
- API 5CT, English (valid until 04/2026)Hamm plant
DNV GL
- DNV GL, English (valid until 07/2024) Siegen plant
- DNV GL, English (valid until 06/2024)Hamm plant
DVGW certificate
- DVGW certificate, English (valid until 06/2026)Siegen plant
- DVGW certificate, German (valid until 06/2026)Siegen plant
