DE-PRESSURISE THE LINE
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
|
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. |
|
Clamp
Size
|
X
|
2X
|
ins
|
mm
|
ins
|
mm
|
Light Duty
Clamp 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
Clamp 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
|
|
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 |
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. |
|
| 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 |
|
|
|
