Numerous PDFs for further information

We have supplied you with a whole series of PDF files for download. Do you want to know more about our certifications? Do you need detailed technical information about our steel pipe products and procedures? Do you want to learn more about our conditions and terms of trade? Then you are in exactly the right place!


Energy management system according to DIN EN ISO 50001:2011

TÜV Certificate DIN EN ISO 9001:2015 english

TÜV Certificate AD 2000 W0 TRD 100 english

TÜV Certificate DGRL 97 23 EG english

TÜV Rheinland ASTM A 178

TÜV Nord EN 10219-1:2006


Bureau Veritas

Germanischer Lloyd approval

Booklets and literature

Flender Range of products

Flender Imagebrochure

Flender Valuebrochure

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Dear visitor to this website,

the Rudolf Flender Rohr GmbH pipe production in Siegen was permanently closed on December 31, 2020. The production is closed and all supplies and machines have been sold. We ask you to pay attention to this!

To preserve, remember and honor the work of all employees who have written a total of 110 years of company history, this website remains online, even if no more products are offered for sale.

To contact us, please dial +49 (271) 3305-0 or email:

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