When assembling a tube nut and sleeve to tubing there are certain steps that need to be taken to insure that a good seal is achieved. Either a tube fitting body or pre-installation body can be used. The following steps illustrate how this process is completed.
Directions for Assembly of Tube Nut
1
Cut the pipe square, remove all internal and external burrs.
2
Oil internal threading and cone thoroughly.
3
Thoroughly oil both ring and nut (do not grease).
4
Fit both ring and nut onto the pipe. Be careful not to fit the ring the wrong way.
5
Screw on the nut by hand until it touches.
6
Push the tube against the thrust of internal cone.
7
Screw on until the pipe cannot turn any more. Draw a mark on the nut to improve the convenience of checking the number of turns to be given.
8
Give the nut a 3/4 turn, the ring clamps the pipe (the pipe must not rotate).
9
Final clamping is achieved by tightening the nut 3/4 of a turn. Thus, the ring is sunk into the pipe wall.
10
Next, loosen the nut and check the upset flange fills the whole cutting face of the ring. Otherwise, tighten a bit more. It does not matter if the ring rotates on the pipe.
11
After loosening, the final tightening of the nut should not require excessive pressure.
NOTE:
The straight portion of the pipe must be 2 times the height “H” of the nut as a minimum.
