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GENERAL PIPING DESIGN
GENERAL PIPING DESIGN
GENERL PIPING DESIGN
Feasibility studyPlans of route:
Environmental considerations.
Safety considerations.
Service conditions:
Substance to be transported.
Pressure, temperature, flow.
Surge conditions (liquid, two phase or dry gas).
Pressure drop, selection of pipe diameter.
Quality plan.
Why dose the feasibility study is required?
Because it is the procedure to determine the preliminary design factor.
Feasibility study
GENERL PIPING DESIGN
Feasibility study
GENERL PIPING DESIGN
Feasibility study
GENERL PIPING DESIGN
Feasibility study
GENERL PIPING DESIGN
Feasibility study
GENERL PIPING DESIGN
Feasibility study
GENERL PIPING DESIGN
GENERL PIPING DESIGN
Preliminary Engineering
Design factor :
Refinement factor.
Service conditions.
Detailed classification of locations..
Design criteria :
Pressure\temperature design.
Stress criteria.
Expansion and flexibility.
GENERL PIPING DESIGN
Preliminary Engineering
Materials :
Selection of pipe wall thickness.
Selection of materials.
GENERL PIPING DESIGN
Preliminary Engineering
Design factor:
It is the ratio of the Hoop stress in the pipe at the design pressure to the yield stress of the pipe material.
•It is a function of:
•Design pressure.
•Pipe diameter.
•Pipe wall thickness. The design factor determines the probability of a pipeline rupturing if it has been damaged or is corroded.
Why dose the preliminary engineering is required?
Because it is the procedure to determine the submission for construction authorization.
GENERL PIPING DESIGN
Detailed DesignCrossings :
Environmental factors.
Crossing design.
Review of design factor.
Pipeline installations :Pipeline design.
Pressure design.
Equipment selection.
Review of design factor.
Safety systems.
Stress criteria.
Expansion & flexibility.
Hazardous studies.
GENERL PIPING DESIGN
Corrosion :External corrosion.
Corrosion survey.
Cathodic protection.
Testing and commissioning :environmental factors.
Testing plan.
Commissioning plan.
GENERL PIPING DESIGN
Why dose the detailed design is required?
Because it is the procedure to make the project documents.
GENERL PIPING DESIGN
DESIGN FLOWCHART
Route Quality Assurance Service Conditions
Crossing
Internal Corrosion
Design Factor
External Corrosion
Terminals & Stations
Testing & Commissioning
Materials
Design Criteria
Chosen Design
GENERL PIPING DESIGN
SMYS
0.5% 100%
Plastic
UTS
Strain
Str
ess
YS
Elastic Failure
SMYS
GENERL PIPING DESIGN
Design factor ( f )
t d
The pipe wall thickness is a function of:
Design pressure ( P ) t P
Pipe diameter ( d )
Yield strength of the pipe material ( SY) fs 1/SY
t ( P x d ) / SY
t = Constant x ( P x d / SY )
t = 1/f x (P x d / SY)
f = ( P x d / SY x t )
GENERL PIPING DESIGN
P
t
d
Hoop stress
Sh= P d / 2t
GENERL PIPING DESIGN
P
t
d
Longitudinal stress
Sh= P d / 4t
GENERL PIPING DESIGN
API 5L: 1991 SPECIFIED MINIMUM YIELD STRENGTHSPECIFIED MINIMUM YIELD STRENGTH
lbf/ in2 N/mm2GRADE OF MATERIAL
BX42X46X52X56X60X65X70X80
35000
42000
46000
52000
56000
60000
65000
70000
80000
240
289
317
358
55
386
413
448
482
PIPE MATERIALS
Yield strength
GENERL PIPING DESIGN
