This Troubleshooting Cheat Sheet is a cryogenic digital download designed for nitrogen plant and ASU operators who need fast, field-ready guidance during abnormal operating conditions. It provides a compact, high-impact reference for diagnosing purity drops, pressure instability, cold box imbalance, analyzer drift, ΔT/ΔP deviations, and start-up irregularities. The sheet enables operators to identify root causes quickly and take corrective actions without guesswork.

What This Troubleshooting Cheat Sheet Covers

• Quick symptom → probable cause mapping

• Purity-related troubleshooting steps

• ΔT and ΔP diagnostic patterns

• Cold box temperature and flow irregularity indicators

• Analyzer fault indications and immediate checks

• Purifier cycle and bed switching abnormalities

• Compressor–cold box mismatch symptoms

• Recommended corrective actions for each scenario

Who This Cheat Sheet Is For

• Nitrogen plant operators

• ASU commissioning and start-up teams

• Troubleshooting and field service engineers

• Shift supervisors and control room teams

• EPC commissioning specialists

When To Use This Cheat Sheet

• During start-up irregularities

• When purity or pressure begins to drift

• When cold box temperatures behave abnormally

• Any time ΔP or ΔT shows instability

• During upset recovery and near-miss events

• As a quick reference during shift handover

✅ 3. Why This Troubleshooting Cheat Sheet Helps

• Reduces time wasted on guesswork

• Helps operators respond correctly to early warning signs

• Supports stable plant recovery during upsets

• Enhances shift-to-shift consistency

• Prevents escalation into trips or purity crashes

• Simplifies troubleshooting communication between control room and field

You may also find these cryogenic digital downloads helpful:

• Pressure Stability Diagnostic Sheet

• Trend Reading Pattern Guide

• Cold Box Flooding Diagnostic Guide