Line Sizing & Hydraulics Flashcards
application
line sizing & hydraulic calculations:
– New project
– Revamped & rejuvenation project
– Debottlenecking project, etc
Main objectives
line sizing & hydraulic calculations
– To size a new line / piping /
– To size a new pressure boosting equipment (e.g. pump,
compressor)
– To calculate the total pressure drop across the line
– To check the sufficiency of available pressure
– To check adequacy of existing piping system and pressure
boosting equipment (e.g. pump, compressor)
Reynolds number
describing the nature of flow in pipe
is the ratio of the inertial forces in the flow to the viscous forces in
the flow
Laminar Flow
Fluid travels as parallel layers (know as stream lines)that do not mix as they move in the direction of flow.
Turbulent Flow
If the flow is turbulent, the fluid does not travel in parallel layers, but moves
in haphazard manner with only the average motion of the fluid being parallel to axis of the pipe
Transitional Flow
If the flow is transitional, both the type of flow may be present at different point along the pipeline or flow may switch between two
Required Documents Line Sizing
- Process Flow Diagram (PFD)
- Heat Material Balance
- Piping & Instrumentation Diagram (PID)
- Isometric Drawing
- Plot Plan / General Arrangement (GA) Drawing
- Equipment Datasheet
- Instrument Datasheet
- Piping Index / Line List / Piping Material Specification
Line sizing based on flow velocity
- Sized between 3 – 15 feet/sec
- Exceed 15 feet/sec may cause flashing ahead of control valve
- Less than 3 feet/sec may cause sand/solid deposition
gas compressibility factor
a measure of the relative volume change of a fluid or solid as a response to a pressure change
Sizing criteria
resulting end pressure is high enough to satisfy the requirement
of the next equipment
