describes loop checking of instrumentation. An instrument technician must have known loop checking.
Full description
loop checking instrumentationDescription complète
Piping Drawings Checking Procedure, Piping Layout
Full description
Basil CrouchFull description
Basil CrouchDescripción completa
Plan génie mécanique ISET
Caso Practico Mkt Op.Descripción completa
solusi manualFull description
beam
Piping Drawings Checking Procedure, Piping Layout
loop checking instrumentationDescripción completa
DNV Software Sesam Se sam User Cou rse
GeniE – Code Checking Beams and Joints Revised: September 13, 2012
Code check standards
API WSD
API LRFD
AISC ASD
AISC LRFD
NORSOK
Eurocode 3
ISO 19902
DS412 / DS449
Compared with Framework: - Modern GUI and easier to use - Detecting worst position - Straight 3 node beams - Better documentation
Code check standards
API WSD
API LRFD
AISC ASD
AISC LRFD
NORSOK
Eurocode 3
ISO 19902
DS412 / DS449
Compared with Framework: - Modern GUI and easier to use - Detecting worst position - Straight 3 node beams - Better documentation
Code checking procedure
First create model, loads, boundary conditions and run analysis Step 0: Set fabrication method, design condition Step 1: Create capacity manager Step 2: Create capacity members/joints within capacity manager
Step 3: Add run to capacity manager
Step 4: Generate code check loads
Step 5: Execute code checks
Step 6: Redesign
Step 7: Rerun (‘Run All’)
Step 8: View and document code check results
- Select beams/joints to include and define default buckling lengths - Select code check standard and load cases - Code check forces are computed in member check positions - One run at a time or multiple runs - Modify properties for capacity members - Rerun Sestra and code checking steps 1-5
- Graphics or tables in report – utilisation factors, forces and other details
Step 0: Model – fabrication method
Fabrication method determine choice of formula in code checking - Has no influence on structural analysis (forces and stresses) - May need to be defined for code checking
Shear factors for modifying shear area may also be given - Influence results from the FE analysis - Proper shear area computed by program depending on type of section - Default values 1.0 for shear factors should normally be used
Step 0: Model – design condition
For API load cases should be assigned design conditions - Do not include stress increase factors in code check
Design condition is irrelevant for other code check standards
Step 1: Capacity manager
In browser right-click Capacity to create a capacity manager - Create several capacity managers to include different analysis runs
- You may edit from selecting in browser, right-click and select Properties:
Step 2: Capacity members
Right-click capacity manager to create capacity members - For complete structure or subsets - Define additional capacity managers for checking different subsets of same analysis
Step 2: Capacity members – buckling lengths
Default buckling lengths are result of creating capacity members - Default buckling length is equal to capacity member length
1 member for leg
12 members for leg
4 members for leg
Step 2: Capacity joints
Right-click capacity manager to create capacity joints for punching shear check of tubular joints
Step 3: Add run – load cases and standard
Loadcases and Standard Selection
Step 3: Add run – general safety factors
Change general safety factors relevant for chosen standard
Optionally check for computing loads for codecheck - Saves memory and provides stability to program
Step 3: Add run – global buckling factors
Step 3: Add run – local buckling factors
Buckling Factors
Max/Min Bending Moments
Step 3: Add run – joint data
Give global joint data when adding/creating code check run
Change for selected joints
Step 3: Add run – joint data
Critical Joints in ISO joint codecheck
Step 3: Add run – joint data
Azimuthal Tolerance angle
Hydrostatic Pressure from Wajac
Individual Brace to Can end distance
C1 and C2 factors
Step 4: Code check loads
Determines code check positions for all members and computes forces
Worst positions determined based on geometrical criteria and min/max moment positions – independently of nodes and element result points - Min/max moment positions account for local loads max
max
Step 5: Execute code checks
Execute the code checks to find utilisation factors
Member
Position along member Utilisation Loadcase factor
Governing formulas
Geometry check
Member code check results listed in browser
Joint code check results listed in browser
Step 5: Code checks – utilisation factors
Formulas of code checking standards define design strength of members and joints
Failure modes: - Strength (yield) of cross section - Stability of member due to compression and/or moments - Hydrostatic collapse
cone punching strength
- Punching shear of chord (can) from incoming braces (stubs) in a tubular joint - Conical transition (tubular)
Formulas converted into
utilisation factors =
actual loading design strength
- Interaction ratio < 1.0 then OK
- Interaction ratio > 1.0 then failure (requires re-design)
stability
hydrostatic collapse
Step 5: Code checks – geometry check
Formulas of code checking standards set criteria concerning geometry, i.e. independent of actual loading, examples: - Tubes: - Max diameter/thickness ratio (e.g. API: D/t < 300) - Min thickness (e.g. API t ≥ 0.25 inch) - Non-tubes: - Slenderness (e.g. AISC L/r < 200 for member in compression) - Compactness
Step 6: Redesign
Modify capacity model (not concept model) with e.g. new cross sections - Gives new ultimate capacity - Member forces are the same
Check utilization and iterate on capacity model until capacity is OK
Update the concept model and run all steps Update the concept model
Iterate on capacity model
Step 6: Efficient redesign of members
Modify sections, material, stiffener spacing or buckling length parameters
Calculate new utilization - The loads and stiffness are not updated
Commit changes to model
Rerun analysis and code check
Step 6: Redesign – synchronisation
‘Run All’ ensures synchronisation between concept and capacity models
The ‘Code Check Status’ allows for a manual check during the redesign stage
The ‘Run All’ command will - Update structure from members - Run analysis - Generate code check loads (positions) - Execute code check
Step 8: View code check results in colours
Document in colours – select whole or parts of model and right-click - As selected members are red click outside model to see colour coding
Step 8: View code check results using labels
Document with labels – select whole or parts of model and right-click
Step 8: View other code check data
Labelling - Buckling Length - Buckling Factor - Codecheck standard - Codecheck Formula - Highest Utilization - Loadcase
Step 8: View code check results in detail
Browser provides detailed code check results for members
Step 8: View sorted code check results
Click any column header in browser to sort
Step 8: Document code check results
File > Save report creates report in Word, Excel, html and text formats
Specify content of report: - Loadcases: All, worst, select - Positions: All or worst only - Members/joints: All or select - Utilisation factor: All or limited
Step 8: Document code check results
Summary of code check results in report shown
Codecheck Data
Executed commands saved in database js file and xml file - XML file automatically saves all codecheck data - JS file needs manual copying commands in to separate js file
