Types of Tubing
What are the three types of refrigerant tubing commonly used in HVACR systems?
What are ACR copper tubing, stainless steel tubing, and aluminum tubing.
Which tool is used to cut large, hard-drawn copper tubing?
A hacksaw.
What gas is a dangerous by-product when refrigerants are exposed to flame?
Phosgene gas.
What temperature defines the difference between soldering and brazing?
840°F (450°C).
What is the common use of ABS pipe?
Drainage, waste, and vent piping.
Which type of copper tubing is annealed for flexibility?
What is Soft ACR tubing?
How is a single flare formed in copper tubing?
Using a flaring tool at a 45° angle with SAE fittings.
What is the recommended eye protection filter for soldering?
No. 2 filter lens or darker.
What are the main soldering filler materials?
Tin-lead and 95/5 tin-antimony
What type of pipe is commonly used for gas lines?
Black steel pipe.
What are the wall thickness designations for copper water tubing?
What is K (heavy wall), L (medium wall).
What is the purpose of using a bending spring?
To make manual bending easier and prevent flattening.
What is the recommended eye protection filter for brazing?
No. 4 or darker filter lens.
What filler materials are used for brazing refrigeration tubing?
Alloys with 15% to 45% silver.
Which plastic pipe type is suitable for hot and cold water lines?
CPVC.
What is the key advantage of stainless steel tubing in food processing applications?
Resistance to corrosion.
Why is purging necessary before brazing?
What is to remove air, vapors, dirt, and moisture from the tubing.
What equipment should be used to prevent flashback in oxyfuel torches?
Flashback arrestors and check valves.
What is the recommended method to join different metals like aluminum to copper tubing?
Mechanical fittings.
Why can't schedule 40 plastic pipe be threaded?
It's too thin and must be solvent-welded.
What is the typical usage of aluminum tubing?
What is used in evaporators and some heat exchanger designs.
What is the recommended gas pressure for purging during brazing?
1 psi to 2 psi.
Why should you never point a lit torch toward an open flame or sparks?
It could cause a dangerous fire or explosion.
What is a swaging tool used for?
Expanding the end of a tube to accept another tube of the same size.
What process bonds plastic pipe fittings?
Solvent welding.