Always check, never take it for granted that the line has been de-pressurised. Proceed
with caution in case seepage has caused pressure to build up again.
SLACKEN NUTS BUT DO NOT REMOVE THE NUTS FROM THE BOLTS -
THEN SLACKEN CLAMP SEGMENTS
Gradually run the nuts back along the bolts until just loose. If clamp segments remain
bound onto hubs, then BOTH segments must be slackened by hitting the inner face of
the clamp lugs with a suitable hammer.
REPEAT SLACKENING PROCEDURE
Re-loosen nuts and re-slacken BOTH clamp segments until the maximum nut travel
shown below is reached. This should release seal ring contact and any residual pressure
will then be released through, with the joint.
Clamp Size
X
2X
ins
mm
ins
mm
Standard Clamp Series
1"
0.1
3
0.2
5
1 1/2"
0.1
3
0.2
6
2"
0.1
3
0.2
6
3"
0.2
4
0.3
8
4"
0.2
5
0.4
10
5"
0.3
7
0.6
14
6"
0.5
12
1.0
24
8"
0.5
13
1.1
27
Clamp Size
X
2X
ins
mm
ins
mm
Light Duty Series
L14"
0.6
16
1.3
33
L16"
0.7
17
1.3
33
L18"
0.7
17
1.3
33
L20"
0.7
17
1.3
34
L24"
0.8
20
1.6
39
Clamp Size
X
2X
ins
mm
ins
mm
Heavy Duty Series
H2"
0.1
3
0.2
6
H3"
0.2
4
0.3
8
H4"
0.2
5
0.4
11
H8"
0.5
12
0.9
24
H10"
0.6
16
1.2
32
H12"
0.7
19
1.5
37
H14"
0.8
20
1.5
39
H16"
0.8
20
1.6
40
H18"
0.8
21
1.7
42
H20"
0.8
22
1.7
43
H22"
0.9
22
1.7
43
H24"
0.9
23
1.8
45
H26"
0.9
23
1.8
45
X = Nut travel at each end of bolt
2X = Total nut travel from assembled position
All data contained herein may be subject to change without notice.
CHECK CLAMPS ARE SLACK AND FREE TO ROTATE AND/OR ROCK ABOUT HUBS
Do not proceed until discharge ceases AND clamps are slack, free to rotate or rock.
NOTE - If pressure is still in the line, the sealring might remain seated, making the
joint tight even though it is part dis-assembled. ONLY when clamps are free to move
can dis-assembly be completed. If the clamps are not free to move DO NOT CONTINUE -
contact your supervisor.
ALWAYS ASK YOURSELF - WHAT IF ?...
What if, the clamp is still under pressure, am I or others in danger, and if so how?
What if, there is still gas or fluid in the line.
What if, the sling snaps.
What if, the load swings in my direction.
What if, the piping springs upon release. (Piping spring may also prevent free rotation of clamps around the hubs).
Cross reference Table
Clamp Size
GR Standard Sizes
GR Optional Sizes
Standard Clamp Series
1"
1GR
1 1/2"
1.5GR
2"
2GR
3"
3GR
4"
4GR
5"
5GR
E
6"
6GR
F,XF
8"
8GR
X8GR
Cross reference Table
Clamp Size
GR Standard Sizes
GR Optional Sizes
Light Duty Series
L14"
X14GR
L16"
X16GR
L18"
X18GR
L20"
X20GR
L24"
X24GR
Cross reference Table
Clamp Size
GR Standard Sizes
GR Optional Sizes
Heavy Duty Clamp Series
H2"
B
H3"
C
H4"
D
H8"
G
XG
H10"
10H
X10H
H12"
12M
X12M
H14"
P
H16"
S
H18"
H20"
U
H22"
V
H24"
W
H26"
Y
Techlok designation uses "in" to denote nominal size in inches as opposed to "GR" which denotes comparable products.
All data contained herein may be subject to change without notice.
