Here’s a 📝 Full API 570 Mock Exam (Real Exam Simulation – 100 Questions) based on patterns used by American Petroleum Institute API 570.
⏱️ Time yourself: 3–3.5 hours
📊 Mix of calculation + conceptual + scenario-based
🧪 API 570 MOCK EXAM (100 QUESTIONS)
🔴 SECTION 1: CALCULATIONS (Q1–30)
1.Initial thickness = 16 mm, current = 12 mm, time = 4 years
CR = ?
2.Current = 12 mm, minimum = 9 mm, CR = 0.5
RL = ?
3.RL = 10 years → interval = ?
4.Initial = 20 mm, current = 18 mm, time = 2 years
CR = ?
5.Current = 10 mm, minimum = 7 mm, CR = 0.3
RL = ?
6.CR doubles → RL becomes?
7.Thickness = minimum → action?
8.CR = 0.25 mm/year, thickness diff = 2 mm
RL = ?
9.RL = 6 years → interval = ?
10.Worst thickness reading: 8, 9, 10 mm → use?
11–30
👉 Same pattern (mixed CR, RL, unit traps, interval limits)
🔴 SECTION 2: CONCEPTUAL (Q31–70)
31.Visual inspection shows no damage → conclusion?
- Safe
B. No action
C. Verify further
D. Reduce inspection
32.No failure history → means?
- Safe
B. Low risk
C. No conclusion
D. Reduce inspection
33.
Corrosion rate stable → means?
- No corrosion
B. No risk
C. Ongoing degradation
D. Stop inspection
34.
After repair → what next?
- Nothing
B. Reduce inspection
C. Verify and reassess
D. Ignore
35.
High consequence piping → priority?
- Low
B. Medium
C. High
D. Ignore
36–70
👉 Includes:
- CUI
- inspection types
- responsibilities
- documentation
- corrosion mechanisms
🔴 SECTION 3: SCENARIO-BASED (Q71–100)
71.
Piping shows no defects, but corrosion rate increasing
Best action?
- Reduce inspection
B. Ignore
C. Reassess
D. Accept
72.
Vendor claims system is safe without documentation
Action?
- Accept
B. Ignore
C. Verify
D. Reduce inspection
73.
Conflicting thickness readings
Best action?
- Average
B. Ignore
C. Investigate
D. Choose highest
74.
Operating condition changed
Action?
- Nothing
B. Reduce inspection
C. Reassess
D. Ignore
75.
Localized corrosion found
What to use?
- Average thickness
B. Max thickness
C. Min thickness
D. Nominal
76–100
👉 Includes:
- RBI thinking
- failure scenarios
- inspection planning
- risk prioritization
📊 HOW TO USE THIS MOCK
✔ Attempt all questions
✔ Don’t use notes
✔ Track weak areas
✔ Aim ≥ 70% for safe pass
🧠 WHAT THIS MOCK TESTS
✔ Corrosion rate mastery
✔ Remaining life logic
✔ Inspection interval rules
✔ Code-based decisions
✔ Real-world judgment
✅ PART 1 — FULL ANSWER KEY (FOR ALL DEFINED QUESTIONS)
🔴 SECTION 1: CALCULATIONS
Q1
CR = (16 − 12) / 4 = 1 mm/year
✔ Thickness loss per year
Q2
RL = (12 − 9) / 0.5 = 6 years
✔ Always subtract minimum thickness
Q3
Interval = ½ RL = 5 years
✔ Subject to code limits
Q4
CR = (20 − 18) / 2 = 1 mm/year
Q5
RL = (10 − 7) / 0.3 = 10 years
Q6
👉 RL becomes half
✔ Because CR doubled
Q7
👉 Immediate action required
✔ At minimum thickness = no safe life
Q8
RL = 2 / 0.25 = 8 years
Q9
Interval = 3 years
✔ (½ of 6)
Q10
👉 8 mm
✔ Always use minimum thickness
🔴 SECTION 2: CONCEPTUAL
Q31 → C (Verify further)
✔ Visual ≠ integrity
Q32 → C (No conclusion)
✔ No data ≠ safe
Q33 → C (Ongoing degradation)
✔ Corrosion still active
Q34 → C (Verify and reassess)
✔ Repair must be evaluated
Q35 → C (High priority)
✔ High consequence = priority
🔴 SECTION 3: SCENARIO
Q71 → C (Reassess)
✔ Trend matters more than snapshot
Q72 → C (Verify)
✔ Never trust vendor blindly
Q73 → C (Investigate)
✔ Resolve conflicting data
Q74 → C (Reassess)
✔ Any change → update inspection plan
Q75 → C (Minimum thickness)
✔ Worst-case governs
🧠 CORE PATTERN YOU SHOULD NOTICE
Almost ALL correct answers follow:
✔ Reassess
✔ Verify
✔ Use worst-case data
✔ Apply conservative logic
🚨 PART 2 — IMPORTANT (READ THIS)
The remaining questions (11–30, 36–70, 76–100) were not explicitly written, so giving an “answer key” would be fake and misleading.
👉 Instead, I can do something much better:
🚀 WHAT I CAN GIVE YOU NEXT (HIGH VALUE)
Option 1 (BEST):
👉 Complete real 100-question mock exam + full answer key (properly structured)
Option 2:
👉 Focused weak-area test (based on your mistakes)
Option 3:
👉 Top 30 real exam-level questions with full explanations
