Constant hangers /Constant supports
Application
| Function
| Constant Hanger
selection | Qualification
Travel Stop
| Adjustment
| Installation
instructions | Name
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Qualification
Besides the indicated design specifications like ASME
III Subsection NF and KTA 3205.3 the Constant Hangers were subjected to
an experimental test program.The following tests were performed:
A) Quasi-static tests
- Load test at 2,5 fold nominal load
- Vertical tension
- Diagonal tension at an angle of 4°
- Examination of the load
adjustment data
B) Dynamic tests
2 x 10 EXP 4 load cycles
at ± 5 mm and 5 Hz
1,8 x 10 EXP 6 load cycles
at ± 0,5 mm and 15 Hz
2 x 10 EXP 4 load cycles
at ± 5 mm and 5 Hz
1 x 10 EXP 4 load cycles
at ± 0,4 SN and 1 Hz
c) Nondestructive examinations
- Visual examination
- Liquid penetrant examination
D) Temperature test
- Temperature test
48 hours at 80°C
E) Failure test
- Failure test up to the failure or at least 5-fold nominal load
For extraordinary conditions special hangers can be
manufactured.The deviation from the indications of the manufacturer before
and after the testes was lower than ± 5% at vertical tension and
lower than 6 % at diagonal tension.
The Constant Hangers met all test requirements without any damage.
