12. Diagnosis of piping and piping supoort devices
Piping and pipe support devices in power stations are subject to early damage and breakdowns when operated for a long period of time due to concentration on and fatigue mainly in the wake of thermal deformation, change in load, aging, rust and imbalance in the supporting load. These problems are difficult to crack when relying only on simple check-ups with the naked eye or through non-destructive testing and thus require in-depth examination engineering.
Major Business Areas
주요업무 안내표
| In-depth Diagnosis Service |
- Review of documents
- Isometric drawings and pipe support drawings
- Maintenance and inspection records
- Hot and cold inspection
- Assess hanger condition(travel, physical condition, function)
- Compare as is conditions with design
- Assess pipe condition(interference, displacement, vibration)
|
| Pipe stress analysis (FEM S/W) |
- Design condition
- Actual load condition
- Piping Remodeling for stress Mitigation
|
| Load Measurement of Hangers |
- Using strain gages and extension meters, etc.
- Actual Load Measurement and Adjustment
- Load Measurement at Hot Condition
|
Why is it useful?
- Verifies the actual load of hangers.
- Evaluates the root cause of abnormal hangers.
- Situ load measurement results are used to rebalance hanger rod load.
- Plant turbine had undergone excessive vibration problems attributed to excessive piping loading for years.
- The excessive vibration problems were solved by Strain gages which were used to determine the loading imposed by the piping system and the movement of turbine as they heated and Stoppers installed on the piping system.
Equipment
- FEM Programs
- ANSYS
- ABAQUS
- ADLPIPE
- CEASAR Ⅱ
- Digital Strain Measurement System
- Extensometer
- Digital Strain Indicator
- Switch and Balance Unit
- Signal Process Program
Experiences
- Yeosu TP #1, 2 (Francoto/AEI, 500MW)
- Mokdong Co-Generation Power Plant (21MW)
- Boryeong TP #1 (Toshiba, 500MW)
- Pyeongtaek TP #1, 2 (Hitachi, 700MW)
- Pyeongtaek CCPP #1~4 (GE, 320MW)
- Seoincheon CCPP #2, 8 (GE, 310MW)
