Qualification

Besides the indicated design instructions like ASME III Subsection NF and KTA 3205.3, the Spring Hangers were subjected to an experimental test program.

The following tests were performed:

A) Quasi-static tests

• load test 2,5-fold nominal load
• vertical tension
• diagonal tension at an angle
  of 4°
• verification of the travel scale
  

B) Dynamic tests

• 1 x 10 EXP 3 load cycles±20 mm and 1 Hz
• 2 x 10 EXP4 load cycles± 5 mm and 5 Hz
• 1,8 x 10 EXP 6 load cycles± 15 mm and 15 Hz
• 2 x 10 EXP 4 load cycles± 5 mm and 5 Hz
• 1 x 10 EXP 3 load cycles± 20 mm and 1 Hz

C) Nondestructive examinations

• visual examination
• liquid penetrant examination
  

D) Failure test

• failure test up to at least 5-fold nominal load
  

The deviation from the indications of the manufacturer before and after the tests was lower than ± 5% at vertical tension and lower than ± 6 % at diagonal tension.

The Spring Hangers passed all testes without damages.

Load cases:

The nominal load corrective factors for the individual load cases are indicated on catalogue page GI 6.