What does C2 do
Content
What does CAESAR II do?
9/15/2010
Session overview
Taking the task from piping design to piping engineering. What questions does CAESAR II answer? A brief CAESAR II “design” sequence design sequence. Should conclude within the hour. Please use the Webinar dialog box to post your questions.
9/15/2010
Intergraph CADWorx & Analysis Solutions
2
Piping designer responsibilities
Designer locates equipment and then routes pipe between these positions using an established “pipe” specification
– – – – – – – – The piping system is a unique pressure containment. Pipe size is based on pressure drop, flow rate Pipe specification (e.g. wall thickness) is based on design pressure & temperature Material based on service requirements q Hydraulic issues Spans between supports (deadweight sag) System stability y y Access / clearance
Givens:
Designer has established rules for basic layout
9/15/2010
Intergraph CADWorx & Analysis Solutions
3
So what’s left for the piping engineer?
Many systems require analysis to evaluate strain
– Sources of thermal growth
Pipe Equipment connections (vessels and equipment)
–
Other sources of strain
Support settlement Support movement in marine piping
Strain S i
– –
Load L d
Stress S
Evaluate pipe load as stress due to this strain Evaluate load on equipment directly
Except for simple layouts, the system response due to this strain is difficult to estimate Analysis yields a better estimate of pipe deflection, loads on pipe supports and equipment connections, and stress in the piping; and not only for strain.
100 feet @ 170F
9/15/2010
Intergraph CADWorx & Analysis Solutions
4
Designer “handoff” to engineering
Many shops develop a “critical line list” to determine which piping layouts require additional engineering evaluation So, a move is made from “Design by Rule to “Design by Analysis” Design Rule” Design Analysis
A where CAESAR II enters the picture This is sample “Critical Line List” from PROCESS PIPING: The Complete Guide to ASME B31.3, by Charles Becht IV, ASME PRESS, New York, 2002 ======================================== • In the case of general piping systems; according to the following line size/flexibility Design b R l vs.i Di D i temperature criteria: i b A l i by Rule Design by Analysis: • All DN 50 (NPS 2) and larger lines with a design differential temperature over 260°C (500°F) Design by Rule: • All DN 100 (NPS 4) and larger lines with a design differential temperature exceeding Minimum pressure thickness = (PD)/(2(SEW+PY)) 205°C (400°F) • All DN 200 (NPS 8) and larger lines with a design differential temperature exceeding 150°C (300°F) Design by Analysis: • All DN 300 (NPS 12) and larger lines with a design differential temperature exceeding Maximum stress due to pressure = Sh = (2/3)(yield stress) 90°C (200°F) Stress due to pressure = PD/2t • All DN 500 (NPS 20) and larger lines at any temperature • All DN 75 (NPS 3) Is PD/2t < Sh ? ( ) and larger lines connected to rotating equipment g g q p • All DN 100 (NPS 4) and larger lines connected to air fin heat exchangers Yes: OK • All DN 150 (NPS 6) and larger lines connected to tankage No: Redesign required • Double-wall piping with a design temperature differential between the inner and the outer pipe greater than 20°C (40°F)
9/15/2010
Intergraph CADWorx & Analysis Solutions
5
Four typical interests in “pipe stress analysis”
Selecting and sizing supports Checking pipe deflection under load Verifying loads on connected equipment Evaluating pipe stress And not only for those strain-based loads…
– – – – – – Deadweight Pressure Wind & wave Earthquake Hydraulic transients H d li t i t Vibration
9/15/2010
Intergraph CADWorx & Analysis Solutions
6
Creating a CAESAR II Model
Start with a stress isometric or similar concept (the analog) Mark up the drawing for analysis Create the piping input model (a digital representation of that analog) 110 90
80 100 120 50 20
10
9/15/2010
Intergraph CADWorx & Analysis Solutions
7
Analog to digital
Analog
Digital representation
9/15/2010
Intergraph CADWorx & Analysis Solutions
8
CAESAR II Results
1. 2. 3. 3 4. Hanger selection, restraint load Pipe sag, horizontal deflection Equipment check Stress check
– A few examples will illustrate…
9/15/2010
Intergraph CADWorx & Analysis Solutions
9
1. Size Support
Size this spring…
What is the load on this steel?
…to minimize this pump load
9/15/2010 Intergraph CADWorx & Analysis Solutions 10
2. Check Deflection
How much d H h does thi elbow this lb move when the system heats up?
9/15/2010
Intergraph CADWorx & Analysis Solutions
11
3. Evaluate Equipment Load
Is this compressor overloaded?
Compressor Thermal Growth Anchor
9/15/2010
Intergraph CADWorx & Analysis Solutions
12
4. Evaluate Pipe Stress
This stub in connection is overstressed and will fail by fatigue over time.
9/15/2010
Intergraph CADWorx & Analysis Solutions
13
Analyze and review TURBO
9/15/2010
Intergraph CADWorx & Analysis Solutions
14
Document Results
9/15/2010
Intergraph CADWorx & Analysis Solutions
15
Conclusion
9/15/2010
Intergraph CADWorx & Analysis Solutions
16
9/15/2010
Session overview
Taking the task from piping design to piping engineering. What questions does CAESAR II answer? A brief CAESAR II “design” sequence design sequence. Should conclude within the hour. Please use the Webinar dialog box to post your questions.
9/15/2010
Intergraph CADWorx & Analysis Solutions
2
Piping designer responsibilities
Designer locates equipment and then routes pipe between these positions using an established “pipe” specification
– – – – – – – – The piping system is a unique pressure containment. Pipe size is based on pressure drop, flow rate Pipe specification (e.g. wall thickness) is based on design pressure & temperature Material based on service requirements q Hydraulic issues Spans between supports (deadweight sag) System stability y y Access / clearance
Givens:
Designer has established rules for basic layout
9/15/2010
Intergraph CADWorx & Analysis Solutions
3
So what’s left for the piping engineer?
Many systems require analysis to evaluate strain
– Sources of thermal growth
Pipe Equipment connections (vessels and equipment)
–
Other sources of strain
Support settlement Support movement in marine piping
Strain S i
– –
Load L d
Stress S
Evaluate pipe load as stress due to this strain Evaluate load on equipment directly
Except for simple layouts, the system response due to this strain is difficult to estimate Analysis yields a better estimate of pipe deflection, loads on pipe supports and equipment connections, and stress in the piping; and not only for strain.
100 feet @ 170F
9/15/2010
Intergraph CADWorx & Analysis Solutions
4
Designer “handoff” to engineering
Many shops develop a “critical line list” to determine which piping layouts require additional engineering evaluation So, a move is made from “Design by Rule to “Design by Analysis” Design Rule” Design Analysis
A where CAESAR II enters the picture This is sample “Critical Line List” from PROCESS PIPING: The Complete Guide to ASME B31.3, by Charles Becht IV, ASME PRESS, New York, 2002 ======================================== • In the case of general piping systems; according to the following line size/flexibility Design b R l vs.i Di D i temperature criteria: i b A l i by Rule Design by Analysis: • All DN 50 (NPS 2) and larger lines with a design differential temperature over 260°C (500°F) Design by Rule: • All DN 100 (NPS 4) and larger lines with a design differential temperature exceeding Minimum pressure thickness = (PD)/(2(SEW+PY)) 205°C (400°F) • All DN 200 (NPS 8) and larger lines with a design differential temperature exceeding 150°C (300°F) Design by Analysis: • All DN 300 (NPS 12) and larger lines with a design differential temperature exceeding Maximum stress due to pressure = Sh = (2/3)(yield stress) 90°C (200°F) Stress due to pressure = PD/2t • All DN 500 (NPS 20) and larger lines at any temperature • All DN 75 (NPS 3) Is PD/2t < Sh ? ( ) and larger lines connected to rotating equipment g g q p • All DN 100 (NPS 4) and larger lines connected to air fin heat exchangers Yes: OK • All DN 150 (NPS 6) and larger lines connected to tankage No: Redesign required • Double-wall piping with a design temperature differential between the inner and the outer pipe greater than 20°C (40°F)
9/15/2010
Intergraph CADWorx & Analysis Solutions
5
Four typical interests in “pipe stress analysis”
Selecting and sizing supports Checking pipe deflection under load Verifying loads on connected equipment Evaluating pipe stress And not only for those strain-based loads…
– – – – – – Deadweight Pressure Wind & wave Earthquake Hydraulic transients H d li t i t Vibration
9/15/2010
Intergraph CADWorx & Analysis Solutions
6
Creating a CAESAR II Model
Start with a stress isometric or similar concept (the analog) Mark up the drawing for analysis Create the piping input model (a digital representation of that analog) 110 90
80 100 120 50 20
10
9/15/2010
Intergraph CADWorx & Analysis Solutions
7
Analog to digital
Analog
Digital representation
9/15/2010
Intergraph CADWorx & Analysis Solutions
8
CAESAR II Results
1. 2. 3. 3 4. Hanger selection, restraint load Pipe sag, horizontal deflection Equipment check Stress check
– A few examples will illustrate…
9/15/2010
Intergraph CADWorx & Analysis Solutions
9
1. Size Support
Size this spring…
What is the load on this steel?
…to minimize this pump load
9/15/2010 Intergraph CADWorx & Analysis Solutions 10
2. Check Deflection
How much d H h does thi elbow this lb move when the system heats up?
9/15/2010
Intergraph CADWorx & Analysis Solutions
11
3. Evaluate Equipment Load
Is this compressor overloaded?
Compressor Thermal Growth Anchor
9/15/2010
Intergraph CADWorx & Analysis Solutions
12
4. Evaluate Pipe Stress
This stub in connection is overstressed and will fail by fatigue over time.
9/15/2010
Intergraph CADWorx & Analysis Solutions
13
Analyze and review TURBO
9/15/2010
Intergraph CADWorx & Analysis Solutions
14
Document Results
9/15/2010
Intergraph CADWorx & Analysis Solutions
15
Conclusion
9/15/2010
Intergraph CADWorx & Analysis Solutions
16
