AIR CONDITIONING AND REFRIGERATION SYSTEMS
Piping
Course 436: Piping
Examines piping system materials and sizing. Includes coverage of codes, valves and fittings, and the cutting and joining of piping
and tubing. Explains the function and unique requirements of the discharge line, liquid line, and suction line. Concludes with a lesson
on piping system maintenance, including handling dirt and scale, expansion, vibration, corrosion, and leaks.
TPC Training is accredited by IACET to offer 0.5 CEU for this program.
Lesson 1: Piping Materials and Fittings Lesson 3: Liquid Line
Topics Topics
The Refrigeration Piping System; Compatibility of Materials; Sizing Functions of the Liquid Line; State of Refrigerant in the Liquid Line; Effects
Refrigeration Piping; Oil Migration in Refrigeration Piping; Pipe vs. Tubing; of Pressure Drop on System Operation; Oil Circulation in the Liquid Line;
Pipe Materials; Standard Pipe Sizes; Pipe Schedules and Codes; Valves Sizing the Liquid Line; Liquid-Line Layout; The Liquid Receiver; Liquid-
and Pipe Fittings; Cutting Pipe Accurately; Methods of Joining Pipe; Uses Line Components and Accessories; Insulating the Liquid Line; Pressure
for Tubing in Refrigeration; Tubing Material and Sizes; Advantages of Relief for Closed Containers
Tubing; Cutting Tubing; Flaring Tubing; Bending Tubing; Fittings for
Tubing; Soldering Tubing Fittings; Brazing Tubing Fittings; Safety in Objectives
Soldering and Brazing • Name the functions of the liquid line.
• Explain why it is desirable to have subcooling in the liquid line.
Objectives • Describe the effects of pressure drop in the liquid line on the
• Name the three main lines of piping in a refrigeration system. operation of a refrigerant system.
• Explain why air conditioning and refrigeration piping must be • Describe the effects of flash gas formation on the performance of
sized correctly. the system.
• Contrast pipe and tubing and explain why tubing is often preferred • Explain the purpose of a liquid receiver.
over piping. • Explain why each of the following devices is used in the liquid
• Explain how pipe is classified according to schedule. line: sight glass, solenoid valve, check valve.
• Name three methods of joining steel pipe.
• Explain how tubing is cut, flared, bent, and joined. Lesson 4: Suction Line
• Describe the step-by-step procedure for making a brazed joint. Topics
Functions of the Suction Line; Lubricating Oil in the Suction Line; Pressure
Lesson 2: Discharge Line Drop in the Suction Line; Suction-Line Accumulators; Suction-Line Heat
Topics Exchanger; Suction-Line Controls; Suction-Line Valves; Suction-Line
Functions of the Discharge Line; Condition of the Refrigerant at Discharge; Filters; Vibration Eliminators; Suction-Line Insulation; Suction Lines for
Pressure Drop in Refrigerant Piping; Effects of Pressure Drop on System Multiple Compressors; Suction Lines for Multiple Evaporators
Operation; Oil Circulation in the Discharge Line; Sizing the Discharge
Line; Discharge Piping Layout; Refrigerant Migration on Off-Cycle; Objectives
Discharge-Line Accessories; Complex Refrigeration Systems; Hot-Gas • Describe the functions of the suction line, its structural demands,
Bypass Piping; Line Selection Based on Refrigerant Type and special design features.
• Explain why suction lines are pitched down toward the
Objectives compressor.
• List the four functions of the discharge line in a refrigeration • Explain how a double suction riser moves oil along with the
piping system. refrigerant.
• Explain the importance of pressure drop in piping and its effects • Explain the function of an accumulator and a heat exchanger in a
on system operation. suction line.
• Define the term entrainment and explain why entrainment of oil is • Describe the basic differences between evaporator pressure
important. regulators and crankcase pressure regulators.
• State the flow velocity needed for refrigerant vapor to entrain oil in • Explain why it is necessary to insulate the suction line.
horizontal piping and in vertical risers. • Explain how a suction line for multiple compressors differs from a
• Name some practical steps you can take to assure a good flow of suction line for a single compressor.
refrigerant in horizontal piping.
• Describe ways of preventing refrigerant and oil migration to the
compressor.
• Name and explain the purposes of three discharge-line
accessories.
84 TPC
TRAINING P: 847.808.4000 • F: 847.808.4003 • www.tpctraining.com
AIR CONDITIONING AND REFRIGERATION SYSTEMS
Piping
Lesson 5: Piping Systems Maintenance
Topics
Causes of Piping Problems; Dirt and Scale in Piping; Allowing for Piping
Expansion; Support for Refrigeration Piping; Protecting Piping from
Vibration; Corrosion in Piping; Piping Leaks; Protecting Piping from
Freezing; Eliminating Liquid Hammer; Thermal Insulation for Piping;
Troubleshooting the Liquid Line; Troubleshooting Moisture Indicators;
Troubleshooting the Suction Line
Objectives
• Name at least four factors that cause piping problems and can
lead to operating problems.
• Explain why cleanliness is essential when assembling
refrigeration piping.
• Name at least three ways to allow for the expansion of piping.
• Describe the various ways of supporting horizontal and vertical
pipe runs.
• Describe the damage that can be caused by vibration and tell
how to protect piping from it.
• Define corrosion and explain how it can be prevented in
refrigerant and water piping.
• Explain the importance of thermal insulation for refrigeration
system piping.
TPC 85
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