Gonar Tube Mill Ltd possesses acknowledgment such Classical and Supervision Societies as:

• – Supervision Technical Office
• – Lloyd’s Register
• – Germanisher Lloyd
• – DNV

Our tubes possess sign of safety "B" and accordance certificates.

Apart from checking dimensions and surfaces in dependence on tubes assortiment we also make the following examinations:

• – tight test
• – definition of chemical constitution
• – definition of mechanical properties in environmental temperature and in higher temperature
• – non-destroying examination of tubes by ultrasonic method
• – examination of strenght impact resistance in temperature +20°C and -60°C

Technological tests:

• – flatten test
• – spreading test
• – test of ring spreading
• – test of ring streching
• – flanging