Boiler Repair Training

Lesson 1 • Core Components and Their Functions

Identifies shells, drums, headers, tubes, burners, and controls. Understanding each part's role is prerequisite to diagnosing failures in later chapters.

Lesson 2 • Reading Boiler Documentation

Teaches interpretation of nameplate data, P&ID diagrams, and manufacturer manuals. Accurate document reading prevents misidentification of components during repair.

Lesson 3 • Boiler Operating Principles

Explains heat transfer, steam generation, and pressure-temperature relationships. These physics concepts underpin every diagnostic and repair decision made later.

Lesson 4 • Safety Regulations and Hazard Awareness

Introduces regulatory inspection requirements, pressure vessel codes, and site hazard categories. Compliance with these standards is mandatory before any repair task begins.

Lesson 1 • Workshop Safety and Housekeeping

Establishes standards for workspace organization, chemical storage, and fire prevention. A disciplined workshop environment reduces accident risk during all repair activities.

Lesson 2 • Power Tools and Pneumatic Equipment

Introduces grinders, drills, and pneumatic tube expanders used in repair operations. Students practice safe setup and operation before applying tools to boiler components.

Lesson 3 • Measurement and Testing Instruments

Teaches use of calipers, micrometers, ultrasonic thickness gauges, and pressure gauges. Accurate measurement is the basis for all repair acceptance criteria.

Lesson 4 • Hand Tools for Boiler Work

Covers wrenches, chisels, tube cutters, and scrapers specific to boiler maintenance. Proper tool selection prevents component damage and personal injury.

Lesson 1 • Pre-Inspection Preparation

Covers shutdown, isolation, venting, and confined-space entry procedures before inspection begins. Skipping any step creates life-threatening conditions inside the vessel.

Lesson 2 • Corrosion and Scale Identification

Identifies pitting, general corrosion, oxygen attack, and scale deposits by appearance. Correct identification determines the appropriate repair or treatment method.

Lesson 3 • Visual Inspection Techniques

Teaches systematic surface examination of tubes, welds, refractory, and fittings. Visual findings direct subsequent non-destructive testing priorities.

Lesson 4 • Condition Reporting and Repair Planning

Structures findings into prioritized repair orders with acceptance criteria and timelines. A clear report ensures repair teams address critical defects first.

Lesson 1 • New Tube Installation and Testing

Guides full tube replacement from fit-up through hydrostatic testing to confirm integrity. Each step follows applicable pressure vessel fabrication standards.

Lesson 2 • Tube Rolling and Expanding

Teaches roller expander setup, torque control, and degree-of-expansion measurement. Proper rolling creates a leak-free mechanical joint without over-thinning the tube wall.

Lesson 3 • Tube Plugging Procedures

Covers tapered and mechanical plug installation as a temporary or permanent repair option. Plugging restores pressure containment while limiting boiler capacity.

Lesson 4 • Tube Failure Modes and Root Causes

Analyzes overheating, corrosion, erosion, and fatigue as primary tube failure mechanisms. Root-cause identification prevents recurrence after repair.

Lesson 1 • Post-Weld Inspection and Acceptance

Applies visual, radiographic, and ultrasonic examination to completed welds against code acceptance criteria. Documented acceptance is required before returning the boiler to service.

Lesson 2 • Weld Defect Identification and Repair

Identifies porosity, undercut, lack of fusion, and cracks using visual and NDT methods. Each defect type requires a specific excavation and re-weld approach.

Lesson 3 • Welding Procedure Specifications

Explains how to read, qualify, and follow a welding procedure specification for pressure work. Deviating from a qualified procedure invalidates the repair.

Lesson 4 • Welding Processes for Boiler Repair

Compares SMAW, GTAW, and FCAW processes for suitability on boiler steels. Process selection affects heat input, distortion, and code compliance.

Lesson 1 • Combustion Fundamentals Review

Revisits stoichiometry, excess air, and flame characteristics as the basis for burner diagnostics. Combustion theory directly explains most burner performance problems.

Lesson 2 • Fuel Train Components and Repair

Identifies gas and oil fuel train components including valves, regulators, strainers, and actuators. Fuel train integrity is critical to safe burner operation and leak prevention.

Lesson 3 • Combustion Tuning and Emissions Reduction

Uses flue gas analyzers to optimize excess air, CO, and NOx levels after burner repair. Proper tuning reduces fuel cost and meets environmental emission limits.

Lesson 4 • Burner Assembly Inspection and Cleaning

Covers nozzle inspection, diffuser cleaning, igniter testing, and flame scanner verification. Clean, aligned burner components are prerequisite to accurate combustion tuning.

Lesson 1 • Water Level Control and Feedwater Systems

Diagnoses and repairs float controls, differential pressure level transmitters, and feedwater regulators. Reliable level control prevents low-water damage and carryover.

Lesson 2 • Programmable Controller Troubleshooting

Applies ladder logic reading and fault code interpretation to diagnose PLC-based boiler controllers. Students isolate faults to the module level without replacing functional components.

Lesson 3 • Boiler Control System Architecture

Maps the relationship between sensors, controllers, final control elements, and safety systems. Understanding architecture is essential before isolating a faulty control component.

Lesson 4 • Pressure and Temperature Sensor Repair

Covers calibration, replacement, and impulse line maintenance for pressure transmitters and thermocouples. Inaccurate sensors cause incorrect control responses and safety trips.

Lesson 1 • Chemical Cleaning and Boil-Out

Removes mill scale, oil, and construction debris through alkaline boil-out before first steam production. Skipping this step contaminates steam and damages downstream equipment.

Lesson 2 • Initial Firing and Warm-Up Sequence

Guides controlled first-fire from cold start through rated pressure using a defined warm-up rate. Thermal shock from rapid heating causes refractory cracking and joint leaks.

Lesson 3 • Hydrostatic and Pneumatic Pressure Testing

Conducts pressure tests at required multiples of design pressure to confirm weld and joint integrity. Test parameters and results must be recorded on the official repair record.

Lesson 4 • Post-Repair Inspection Checklist

Verifies that all repair work is complete, documented, and cleared of tools and debris before any pressure is applied. A missed item at this stage can cause immediate failure.