What kind of flare is used in refrigeration systems?
SAE 45° flare connections are commonly used in automotive applications as well as for refrigeration and air conditioning. SAE fittings are typically made from brass.
Why do flare fittings leak?
Bad flare, burrs on the pipe, wrong size flare, can all cause a flare fitting to leak. The most common reason they leak is because of us overtightening them. I once had a tech tighten one to the point that it blow off during pressure testing.
What is a flare in refrigeration?
You will most often find flares on ductless and VRF/VRV systems and in refrigeration. A flare uses a flared female cone that’s formed into tubing (usually copper). That cone is then pressed onto a male cone (usually brass) by a threaded flare nut.
What are flared fittings used for?
Flared fittings are also a good option for use with heavy machinery, and industrial and construction equipment. They are the fitting is most commonly used to connect tube or hose in high-pressure and high-temperature applications. The flare fitting is commonly used world-wide because it is a simple construction.
How do I stop my flare fitting from leaking?
How to Seal Flare Fitting Connections
- Unscrew the brake line from the fitting.
- Clamp the appropriate-sized collet around the line.
- Connect it to the Surseat lapping tool.
- Spray some lubricant to the lapping head before using it.
- Rotate the lapping head back and forth about 6-10 times.
- Clean and inspect the flare.
Can you over tighten a flare fitting?
Fourth, don’t over-tighten the flare fitting, as this can cause leaks.
What is a flared joint?
A mechanical joint between two pieces of copper or plastic tubing; made by flaring one end of a tube in such a way as to receive a special fitting which fits in the flare; may be taken apart and reassembled without difficulty; especially useful in areas where fire hazard will not permit the open flame required in …
What is the face angle of flares used in the HVAC trade?
What is the face angle of flares used in the HVAC trade? 45 degrees.
Do you use Teflon tape on flare fittings?
Do not use Teflon ® tape or pipe sealant on any flare ends because you will not obtain a leak-free seal. Keep flare end of fitting free of grease, oil and thread sealant. Use a wrench only on the hex surfaces of the fittings.
Do flare fittings need Teflon tape?
The threads in a flare fitting are NOT tapered and do not need to be sealed. The seal is between the flared end of the pipe/tube and the tapered face of the other side of the fitting. All the threaded collar does is supply force to create a seal between the opposite tapers of the two ends.
Can you reuse flare fittings?
Flare fittings are reusable until cross threaded. If they were already crossed toss them. If not be careful re assembling them and you will be fine.
ARE AN fittings the same as flare fittings?
Technically speaking, AN fittings are manufactured to MIL-F-5509, and industrial 37-degree flare fittings are manufactured to meet SAE J514/ISO-8434-2. (Learn how to cross reference Military Specification numbers with this Air-Way tutorial.) The most notable difference between these standards are in the threads.
What angle is the HVAC flare?
45 degree
The correct flaring angle to use for HVAC and plumbing is one with a 45 degree flare. There are flaring tools out there that have different angles such as 37 degrees, which you don’t want for flaring refrigerant tubing.
