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Calculations for Evaluating Thickness Measurements, Inspection Intervals, and Piping Integrity
- Corrosion Rates and Remaining Life
- Calculate average corrosion rate using initial and subsequent thickness readings (API 570, 7.1.2).
- Calculate short-term and long-term corrosion rates when multiple measurements exist.
- Determine remaining life based on current thickness, minimum required thickness, and corrosion rate (API 570, 7.2).
- Apply rules for corroded areas and local thin areas.

- Inspection Intervals
- Determine external visual inspection intervals and thickness measurement intervals for Class 1, 2, and 3 piping (API 570, 6.3.3 & Table 1).
- Understand factors influencing interval adjustments (e.g., corrosion rate trends, RBI if applicable).
- Set next inspection date based on remaining life and safety factors.

- Weld Joint Quality Factors (Ej) and Casting Quality Factors (Ec)
- Select weld joint quality factor Ej from ASME B31.3 Table A-1B for different weld types and joint efficiencies.
- Select casting quality factor Ec from ASME B31.3 Table A-1A.
- Increase joint quality factors (up to 1.0) by performing supplemental NDE as per ASME B31.3 Table 302.3.4 (e.g., 100% RT for seamless to welded transitions).

- Internal Pressure / Minimum Thickness Calculations
- Calculate pressure design thickness (minimum required thickness) for straight pipe under internal pressure (ASME B31.3, 304.1.1 and 304.1.2 formulas).
- Determine minimum thickness for permanent blanks (blanks, spectacle blinds) (ASME B31.3, 304.5.3).
- Calculate MAWP of corroded piping, including future corrosion allowance (API 570, 7.5).
- Adjust calculations for corrosion allowance addition/subtraction and mill tolerance.

- Pressure Testing Requirements
- Calculate hydrostatic leak test pressure (ASME B31.3, 345.4).
- Calculate pneumatic leak test pressure (ASME B31.3, 345.5).
- Understand test medium considerations, safety precautions, and acceptance criteria.

Welding and Brazing
- General Welding Requirements
- Understand ASME B31.3 Chapter V rules for welded joints, sizes, restrictions, reinforcement, preheating, PWHT, and inspection.
- Apply API 570 welding rules (which take precedence over B31.3 in conflicts for in-service work).

- Welding Processes, Inspection, and Metallurgy
- Identify common welding processes, advantages/disadvantages, and typical defects (API RP 577 – full coverage).
- Understand weld imperfection acceptance criteria and repair welding.

- Qualification Requirements
- Differentiate essential, nonessential, and supplementary essential variables for WPS/PQR (ASME Section IX).
- Review and qualify Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR), and Welder Performance Qualifications (WPQ/Welder Qualification).
- Understand welder continuity, retesting, and performance essential variables.

Nondestructive Examination (NDE)
- NDE Methods and Procedures
- Understand requirements and techniques for RT, UT, MT, PT, VT, and other methods (ASME BPVC Section V – Articles 1–10, mandatory appendices).
- Know personnel qualification and certification (ASNT SNT-TC-1A or equivalent referenced).
- Interpret NDE results, acceptance criteria, and documentation.

- Application to Piping
- Select appropriate NDE for weld joints, thickness measurements, and defect detection in in-service piping.

Inspection, Examination, and Pressure Testing Practices
- API 570 Core Rules
- Inspection types (external visual, thickness measurement, injection points, deadlegs, auxiliary piping).
- Frequency and extent of inspections (Class 1/2/3 piping).
- Data evaluation, recordkeeping, and CML (Condition Monitoring Location)/TML management.
- Repair, alteration, and rerating procedures (including authorization, documentation, and pressure testing after repairs).

- Piping System Components
- Inspection practices for pipe, valves, fittings, flanges, supports, and special components (API RP 574 – full coverage).
- Identify common degradation modes and inspection techniques for each component.

- Pressure-Relieving Devices
- Inspection, testing, and repair of PRDs (pressure relief valves, rupture disks) (API RP 576 – full coverage).

Material Verification Program
- PMI and Material Control
- Apply PMI techniques, extent, and acceptance criteria for new and existing assets (API RP 578 – full coverage).
- Understand alloy verification, positive material identification methods, and documentation.

Damage Mechanisms (from API RP 571 – specific mechanisms only)
- Common Mechanisms in Piping
- General/localized corrosion (atmospheric, galvanic, soil, microbiologically influenced – MIC).
- Corrosion under insulation (CUI), pitting, crevice corrosion.
- Erosion/erosion-corrosion.
- High-temperature mechanisms: sulfidation, high-temperature hydrogen attack (HTHA), carburization.
- Cracking mechanisms: chloride SCC, caustic cracking/embrittlement, amine cracking, sulfide stress cracking (SSC).
- Other: dew-point corrosion, boiler water/condensate corrosion, oxygen pitting, vibration-induced fatigue, mechanical fatigue.

- Critical Factors and Appearance
- Identify susceptible materials, environments, temperature/pressure ranges, and mitigation strategies for each mechanism.

Additional Supporting Topics
- Flanges and Bolting
- Flange ratings, dimensions, facing, and assembly practices (ASME B16.5).

- Repair Methods
- Post-construction repair techniques (ASME PCC-2 – relevant articles for piping repairs, e.g., welded sleeves, composite wraps).

- General Concepts
- Key terms: MAWP, CML/TML, injection point circuit, deadleg, rerating, alteration vs. repair, fitness-for-service basics.
- Buried piping inspection considerations.
- Overall application of codes to real-world in-service scenarios.