Proper position, Setting position of piston – Carlon Expansion Joints User Manual
Page 3
w w w . c a r l o n . c o m
Add 30°F to
temperature
change for direct
sunlight exposure.
Solvent weld
Mid-point
Piston opening
Pipe strap
should be anchored
tightly to barrel
Pipe strap
mounted loosely
to allow movement
Solvent weld
Length
of Run
(Feet)
Inches of Expansion Allowance Needed
for Temperature Changes of:
60°F
80°F
100°F
120°F
140°F
25
5
/
8
3
/
4
1
1
1
/
4
1
3
/
8
50
1
1
/
4
1
5
/
8
2
2
3
/
8
2
3
/
4
75
1
3
/
4
2
3
/
8
3
3
1
/
2
4
1
/
8
100
2
3
/
8
3
1
/
8
4
4
3
/
4
5
1
/
2
125
3
4
5
6
7
150
3
5
/
8
4
3
/
4
6
7
1
/
8
8
1
/
4
Proper Position
Expansion fittings are usually installed in a
horizontal position. However, if they must
be put in a vertical application, the open
end should be securely fastened in the
down position. The expansion fitting must
be installed close to the top of the run
with the barrel pointing down, so that
rain water does not enter into the opening.
The lower end of the conduit run should
be secured at the bottom. This will result
in an upward movement due to the length
change caused by temperature variations.
Setting Position of Piston
If an expansion fitting was installed completely closed with
the piston bottomed on a cool day, there would be no travel
available when the conduit warmed up and expanded. If it
was installed in a maximum open position on a hot day, the
expansion fitting would pull apart when cooled. Thus, “setting”
the expansion fitting is very important.
In addition to the proper number and sizes of expansion fittings
chosen, they must also be installed so they can accommodate
the expected length change. This requires proper “setting” of
the expansion fitting. Most will be installed at a temperature
halfway between maximum and minimum; for example,
installation at 65°F with an anticipated maximum temperature
of 125°F and a minimum of 5°F. In this case, the expansion
fitting would be installed or set with the inner piston halfway
out. Expansion fittings are marked with a mid-point. If it was
a colder day, for example 35°F with the same expected
temperature change range, the inner piston would be set with
1/4 of its maximum travel out. If the temperature was hot
(95°F), it would be set with the inner piston only 3/4 way out.
Gross Automation (877) 268-3700 · www.carlonsales.com · [email protected]