Pipe strain Flashcards
types of static load
weight
thermal
foundational
types of dynamic load
vibration wind water hammer slug flow change of PSV
pipe strain distortion can cause
bed warp
casing damage
mechanical seal failure
vibration
rule for vibration frequency for support
greater stiffness = vibration
higher vibration
flange joint tolerance
1/16
flange bolt tolerance
1/8
flange face tolerance
1/16
dial placement for checking pipe strain
12 and 3
gap between pipe and support to allow for shimming
1/4
3 fittings to join pipe
orifice plate
bellow expansion
welded spool
flame methods for correcting pipe strain
holt
line
spot
flame bending for greatest amount of bending
holt method
flame bending method for small amount of deflection
spot method
3 steps for heat movement
pipe length
deflection
parallel
abbreviation PSA
pipe stress anaylsis
correct deflection pump to source or source to pump
pump to source
ASME code for piping process
31.3
ASME code for power piping
31.1
stress result of internal or external pressures and is considered uniform across the piping
hoop or constant
stress when both ends of the pipe are fixed. Pipe is not allowed to move thermally in either direction
axial or elongation
stress applied to the piping by gravity, pipe weight, or piping hardware such as valve
bending
stress caused by the continual cycling of pressure and temperature change
fatigue
requirement for PSA
temperature exceeds 177 Celsius
or 66 Celsius on 4 inch diameter
loads that PSA anaylize
hydrostatic sustained operating expansion occasional
pipe fittings for axial movement
orifice plate, welded spool
pipe fitting for temperature or pressure change
bellow expansion joint
