Hangers & Snubbers Flashcards
Type of strain and movement experienced by plant systems?
Weight of pipe
Fluid in pipe
System components
Press. & Temp. Expansion and contraction
Flow changes and pressure surges
Purpose of hangers?
Used to support piping systems
Prevent damage by compensating for strains and movements
Considerations for hanger construction?
Pipe size
Pipe configuration
Location of system equipment
Structural points available for support attachment
Flexible hanger
Piping support to allow for vertical movement due to thermal expansion
Constant support hanger
Provides full range support of expansion and contraction
Variable support hanger
Support changes with spring deflection and spring scale
Rigid hanger
No vertical movement
Purpose of a snubber?
Restrain movement during seismic event, unit trips, etc.
Ensure system can still perform safety function
Ensure adequate movement during normal operation
Mechanical snubber
Limit acceleration of movement
Hydraulic snubber
Limit velocity of movement
How does hydraulic snubbers fail?
After severe service (water hammer, earthquake,etc)
How do Mechanical snubbers fail?
Improper assembly
Overheating due to welding
Becoming dirty/corroded
Improper lubrication
