⚡ API 570 ULTRA CHEAT SHEET (PASS MODE)
🔥 1. MUST-KNOW FORMULAS
✔ Corrosion Rate (CR)
CR = (Initial − Current) / Time
✔ Remaining Life (RL)
RL = (Current − Minimum) / CR
✔ Inspection Interval
≈ ½ RL (BUT ≤ code limit)
🧠 2. CORE RELATIONSHIP
👉 CR ↑ → RL ↓ → Interval ↓
👉 Thickness ↓ → RL ↓
👉 RL ↓ → Inspection frequency ↑
🔴 3. GOLDEN RULES
✔ Always use minimum thickness
✔ Always use highest corrosion rate
✔ Always choose conservative answer
✔ Always follow code limits
⚠️ 4. CRITICAL CONDITIONS
✔ Current = Minimum → 🚨 Immediate action
✔ Thickness near minimum → 🔴 High risk
✔ No data → ❗ Use conservative assumption
🔍 5. INSPECTION LOGIC
✔ Visual inspection ≠ integrity
✔ Thickness measurement = key
✔ Local corrosion → use worst point
✔ Conflicting data → verify
📘 6. CODE-FIRST THINKING
If unsure, choose answer that:
✔ Follows API 570 rules
✔ Meets inspection interval limits
✔ Requires verification
✔ Is safety-focused
🚨 7. COMMON TRAPS
❌ Use average thickness
❌ Use lowest corrosion rate
❌ Ignore minimum thickness
❌ Trust vendor blindly
❌ Assume “no defect = safe”
❌ Skip code limits
🧠 8. SCENARIO QUESTION STRATEGY
- Identify:
- Thickness
- CR
- RL
- Ask:
👉 “What is worst-case?” - Choose:
👉 Conservative + code-based answer
⚡ 9. 5-SECOND DECISION RULE
If stuck:
👉 Choose option that:
✔ Uses worst data
✔ Is safer
✔ Requires verification
🎯 10. FINAL 10-SECOND MENTAL CHECK
Before exam:
✔ CR formula
✔ RL formula
✔ Interval = ½ RL
✔ Use minimum thickness
✔ Use highest CR
✔ Follow code
🏁 FINAL TRUTH
You pass API 570 if you:
✔ Think conservative
✔ Use correct formulas
✔ Follow code
✔ Avoid traps
🚀 LAST LINE
“Use worst-case data, follow code, and choose the safest answer.”
