ReplyYou will be told to follow mfgs install instructions. IMO, flare fittings done correctly work very well.
Regular Guest
This is going to sound off the wall ,but from reading post on brazing ,soldering ,connecting copper lines .Reading the problems that may be caused by improper brazing,ext, . Why isn't the practice of using double flare connectors used instead ? Seems to me that that would take the guess work out of contaminating and handle vibration leaks . Just my 2 cents .
Professional Member
You will be told to follow mfgs install instructions. IMO, flare fittings done correctly work very well.
Regular Guest
I am not associated with your industry .but have been a cert.master mechanic on heavy equipment for 40 years .I work on a lot of hydraulic systems that carry very high pressures ,one type pressure system is a closed loop ,meaning that when it is called into operation the pressure hits like a sledge hammer.The fittings almost never fail , they maintain their integrity on occasions when the pressure will blow a triple ,wire braided hose wide open. Also on our air condition units they go through extreme vibration and run under very high heat situations(compressor sits beside of a screaming ,scalding hot diesel engine) and long runs of hoes up to the cab.The a/c's use only fittings also .Anyway I think that fittings would be a big improvement form my state on mind..Thanks for listeningOriginally Posted by fastfred
God Speed, Jim. We'll miss you - 2-26-23
Flares work.
Double flaring 7/8" could be a bite.
In your industry, how many flares do you do a day, 5 days a week.
Professional Member
All the mini-split systems I've installed have flare connections
Professional Member*
back in the day units were all flare fittings.
brazed connections are MUCH better.
never saw double flares on a/c units but i don't think it would help.
biggest problem was expansion and contraction of different types of metal would loosen the fittings.
Professional Member
[QUOTE=GERMAN;1866385]I am not associated with your industry .
We use to use Double flare but now the industry just decided to go brazen. keeprite use to have precharged linesets with flare ends on them in 1980s.
Do it right the first time.
Professional Member
There are two types of flares:
1. A flare that leaks
2. A flare that is going to leak!
Banned
you forgot 2 more ways you did not mention
3. a flare that is not done properly
4. a flare that is done properly
read very carefully;
a flare done properly can outlast a brazed joint done improperly
a flare joint done improperly wont outlast a brazed joint done properly
if you have a flare joint done properly and a brazed joint done properly either may fail first
shall i go on
.
Regular Guest
I have not seen a problem with double flares leaking, when properly done and tightened. and that's with equipment that takes terrible abuse. How many times do you see a line on your automobile brake system leak at the fitting ? They are double flare .But like I said this is from my experience and just friendly conversation. And yes I am willing to flare as many lines as my job pays for , but if we are at the shop we do have a hydraulic flare crimp machine that is time saver. Thanks for joining in.
God Speed, Jim. We'll miss you - 2-26-23
I realize that your flares take as much, and maybe more extreme temps.
Ours only have to with stand -30 to 135*F temps, and less then 600 PSIG.
Lots of small refrigeration units use flare.
As airmechanical pointed out. Either done wrong won't last.
If a guy isn't going to take time to braze propery, he isn't going to take time to double flare properly either.
Long story short. If your worried about your contractor not using proper brazing procedure, you hired the wrong contractor.
Unfortunately, what the salesman promises, and what the installer delivers, is quiet often 2 different things. And, if it isn't written in the contract, the salesman never agreed to it.
Regular Guest
What do they use in aircraft hydraulic control connections, braze, double flare or something better than either?
God Speed, Jim. We'll miss you - 2-26-23
Flare I believe. Use to know a couple mechanics.
Of course, air craft is usually maintained much better then your average A/C.
Professional Member
If new units came with a flare connection, I'd use it.....
It's pretty much that simple.
If its a copper socket, I'm gonna jab a copper pipe in it and braze it, not braze in a flare adapter.
___________________________________________
Professional Member*
not much can be addedyou forgot 2 more ways you did not mention
3. a flare that is not done properly
4. a flare that is done properly
read very carefully;
a flare done properly can outlast a brazed joint done improperly
a flare joint done improperly wont outlast a brazed joint done properly
if you have a flare joint done properly and a brazed joint done properly either may fail first
shall i go on
.
very well stated
Professional Member
What costs the manufacturer more. Flared fittings or a piece of pipe?
hmmmmmmmmm
I love my job, but paydays Thursday
Professional Member
Its so odd to see this thread today cuz I just finished installing a walk-in cooler and freezer system both new for a local meat processor. As I was kneeling in the wind, Brazing my 7/8" acr copper suction lines to the stainless steel accumulator head at the condensor, I remember thinking to my self as I was waiting for my silflo dissimalar paste to open up the pours and suck in my 15% silflo while I was blocking the wind...I remember thinkin "I wish this suction line had a flare like my 3/8 liquid line does. Guess thier has to be a manufactures reason for it...HMM"
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