Pressure Retaining Engineering Services

Pressure Piping and Vessels





Rig Engineering Assessment

LEVEL 1 – COMPONENT CODE CHECK

A. ASME B31.3 Process Piping
– Chapter II Design (for ordinary service piping)
– Chapter IX High Pressure Piping
– Straight pipe and pipe bends design check
– Software: Mathcad calculators prepared by RE
– Pipe standard ASME B16.5/B16.47 flange and non- standard flange stress analysis and leakage check for internal pressure and external loading, if prescribed
– Software: Codeware Compress (www.codeware.com)

B. ASME Boiler & Pressure Vessel Code, Section VIII Division 1 and Division 2 Part 4 Design by Rules (DBR)
– Air Pressure Vessel (APV) and Mud Gas Separator (MGS) vessel types and Bulk Tanks
– Vessel body / opening / nozzle flange stress analysis and leakage check using Div. 1 App. 2 and/or Div. 2 Part 4 (DBR) for internal pressure and external loading, if prescribed
– Vessel nozzles and supports
– Software: Codeware Compress (www.codeware.com)

C. DNV Rules for Piping
– Design reference: DNV-OS-E101 Drilling Plant, DNV-RP-D101 Structural Analysis of Piping System
– Software: Mathcad calculators prepared by RE and Level 3 software (see page 3 for details)
– Design reference: DNV-OS-D101 Marine and Machinery Systems and Equipment
– Equivalent von Mises Stress Theory
– Software: Mathcad calculators prepared by RE

D. API Specifications for Drilling Systems (API Spec. 6A, API TR 6AF, API TR 6AF2, API Spec. 16C)
– API flange stress analysis and leakage check using ASME BPVC Sec. VIII Div. 2 Part 4 (DBR) for internal pressure and external loading, if prescribed
– Software: Codeware Compress (www.codeware.com)
– Advanced FEA assessment of API flanges (e.g. 6BX or 17SV) using ASME BPVC Sec. VIII Div. 2 Part 5 Design by Analysis (DBA) and/or von Mises Stress Method
– Software: Autodesk Mechanical Simulation (www.autodesk.com/simulation-mechanical)

LEVEL 2 – CORRODED COMPONENT EVALUATION

A. Recommended Practice DNV-RP-F101 Corroded Pipelines (for cylinders)
– Part A – Load Resistance Factor Design (LRFD). Advanced analysis reflecting probabilistic approach (partial safety factors): safety class level, inspection method, confidence level, standard deviation calculation
– Part B – Allowable Stress Design (ASD). Simple analysis with a global usage factor
– Assessment scope: carbon steel not exceeding API X80 grade, no cyclic loads and sharp defects (cracks), thickness not more than 40 mm, not recommended when fracture is likely to occur
– Software: Mathcad calculators prepared by RE

B. Recommended Practice API 579-1/ASME Fitness-For-Service-1 (for heads and cylinders)
– Part 4 – Assessment of General Metal Loss
– Assessment scope: pipelines and vessels designed in accordance with ASME B31 and BPVC Sec. VIII Div. 1, corrosion loss only
– Software: Mathcad calculators prepared by RE

C. Manual for Determining the Remaining Strength of Corroded Pipelines ASME B31G
– Supplement to ASME B31 Pressure Piping
– Assessment for corroded thickness between 10 to 80% of original thickness

LEVEL 3 – SYSTEM EVALUATION

Finite Element Analysis (FEA) of entire piping or pressure-containing system
– Piping resistance and flexibility analysis in accordance with ASME B31.3
– Software: Bentley AutoPIPE (www.bentley.com/products/autopipe) and Algor PipePak (www.algor.com/products/algorPipePak)
– Structural analysis of pressure vessels and pressure-containing equipment (e.g. non-standard elements, valve bodies) in accordance with ASME BPVC Sec. VIII Div. 2 Part 5 Design by Analysis (DBA) and/or von Mises Stress Method
– Software: Autodesk Robot Structural Analysis (www.autodesk.com/robot-structural-analysis-professional) and Autodesk Mechanical Simulation (www.autodesk.com/simulation-mechanical)



BENEFITS:

– Fitness for Service (FFS) approach for Maintenance/Shut down
– Remaining strength assessment
– Acceptance criteria determining minimum safe wall thickness or Maximum Allowable Operating Pressure (MAOP) (also known as Maximum Allowable Working Pressure – MAWP)
– Components (straight pipe, pipe bends, pipe flanges, vessel cylinder, dome ends, body flanges and opening closures, nozzles and supports) or entire system evaluation (pressure piping, vessels and equipment)
– Thorough assessment of piping and vessels – Finite Element Analysis (FEA) including offshore specific load conditions



Key word: Rig Engineering, Pressure Piping & Vessels, ASME B31.3, ASME BPVC Sec. VIII Div. 1 & Div. 2, ASME B31G, DNV-RP-D101, DNV-RP-F101, API 579-1/ASME FFS-1, API 6A, API TR 6AF, Piping & Flange Analysis, Flange Leakage, Corroded Pipelines &Vessels Evaluation, Fitness For Service, Bentley AutoPIPE, Algor PipePak, Codware Compress, Autodesk Robot Structural Analysis, Autodesk Mechanical Simulation