Minneapolis Journeyman Steam and Hot Water - 776-MN-MI Exam

1. General Knowledge and Science

This section covers the fundamental physics and principles behind steam and hot water systems.

Thermodynamics: Understanding the relationship between pressure, temperature, and volume of steam.

Heat Transfer: Principles of conduction, convection, and radiation in heating systems.

Hydraulics: Calculations for flow rate, pressure drop, and pump head requirements.

Calculations: * Determining BTU requirements.

Pipe expansion and contraction math.

Basic algebraic formulas for system sizing.

2. Boilers and Heat Sources

Focuses on the equipment used to generate heat and the safety protocols surrounding them.

Low-Pressure Boilers: Steam systems not exceeding 15 psi and hot water systems not exceeding 160 psi or 250

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F.

High-Pressure Boilers: Understanding the complexities of systems operating above 15 psi steam.

Boiler Components: * Burners, heat exchangers, and combustion air requirements.

Feedwater systems and deaerators.

Safety Devices: * Pressure relief valves (PRV) and safety valves.

Low-water cutoffs (LWCO) and high-limit controls.

3. Piping Systems and Materials

Knowledge of the "skeleton" of the system—how to transport the medium safely.

Materials and Standards: * ASTM and ASME standards for carbon steel, stainless steel, and copper piping.

Proper use of Schedule 40 and Schedule 80 pipe.

Joining Methods: Welding, threading, flanging, and brazing techniques.

Hangers and Supports: Proper spacing and structural requirements to prevent sagging or stress.

Valves: Application and maintenance of gate, globe, ball, check, and butterfly valves.

4. Steam System Specifics

Detailed requirements for steam-specific distribution.

Condensate Return: Gravity vs. vacuum return systems.

Steam Traps: Identification and troubleshooting of thermostatic, float and thermostatic (F&T), and inverted bucket traps.

Drip Legs and Dirt Pockets: Placement and necessity for maintaining steam quality.

Pressure Reducing Stations: Reducing high-pressure steam for terminal unit use.

5. Hydronic (Hot Water) System Specifics

Specifics for closed-loop water systems.

Circulators: Sizing and placement of pumps within the system (pumping away from the expansion tank).

Expansion Tanks: Compression tanks vs. diaphragm tanks and how to calculate air charge.

Air Removal: Use of air scoops, vents, and separators to prevent air-binding.

Hydronic Balancing: Using circuit setters and balancing valves to ensure even heat distribution.

6. Codes, Regulations, and Safety

This is the most critical section for passing the legal portion of the exam.

Minnesota Rules Chapter 5230: Specifically covering high-pressure piping.

ASME B31.1: Power Piping Code basics.

Minneapolis City Ordinances: Local amendments to the mechanical and plumbing codes.

Permitting and Inspections: * When a permit is required.

Required pressure tests (hydrostatic vs. pneumatic).

Safety (OSHA): Trench safety, lockout/tagout (LOTO) for steam systems, and PPE.

7. Troubleshooting and Maintenance

Practical application of journeyman-level skills.

Water Treatment: Preventing scale, corrosion, and foaming through chemical testing.

System Start-up/Shut-down: Proper procedures to prevent water hammer or thermal shock.

Combustion Analysis: Ensuring efficient and safe burner operation.

Exam Preparation Tips

Note: The exam is typically open-book but timed. Familiarity with the Table of Contents and Index of your codebooks (Minnesota State Piping Code and ASME B31.1) is more important than memorizing every specific value.

Would you like a list of the specific reference books allowed in the testing center for this license?