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gruvlok installation and assembly
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166
FIG. 7307
HDPE Transition Coupling
1
Make certain the HDPE pipe end is square
cut to
1
/
8
" maximum for the 2" to 4" and
5
/
32
"
maximum for the 6" and larger sizes. The steel
pipe must be grooved in accordance with
Gruvlok®Grooving Specifcations for Steel Pipe.
The pipe ends must be free of scratches,
indentations, projections or other imperfections,
which could prevent proper sealing of the
gasket.
2
Check to assure the gasket material is
acceptable for the intended service. The
Gasket color code is green for EPDM and
orange for Nitrile (Buna-N).
CAUTION:
Use
only Gruvlok Xtreme
TM
Lubricant. Gruvlok
Xtreme
TM
Lubricant contains silicone. If silicone
is unacceptable for the application contact
Gruvlok for the lubrication recommendation.
Apply a thin coating of Gruvlok Xtreme
TM
Lubricant to the gasket lips and outside surface
of the gasket.
3
Slip the gasket over one of the pipe ends.
Make sure the gasket does not overhang
the pipe end. Align the second pipe and while
holding it in the butted position, slide the
gasket back over the second pipe end. The
gasket must be positioned on the gasket seat
surface of the grooved steel pipe. Make sure the
gasket does not overhang into the pipe groove.
4
Place each half of the coupling housing over
the gasket, making sure the housing grooved
end is directed into the pipe groove.
5
Insert the bolts and secure the nuts
alternately and uniformly until the bolt pads
are in contact. Torque all bolts to the required
bolt torque levels. Refer to the Specifed Bolt
Torque Table. There is no gap between the bolt
pads and the bolt torque should be within the
range given when the coupling is properly
assembled. Alternate and even tightening of the
bolts will signifcantly reduce the torque needed
to close the gap at the pipe joint.
SPECIFIED BOLT TORQUE
Specifed bolt torque is for the oval neck track
bolts used on Gruvlok®couplings. The nuts must
be tightened alternately and evenly until fully
tightened.
CAUTION:
Use of an impact wrench
is not recommended because the torque output
can vary signifcantly due to many variables
including air pressure supply, battery strength
and operational variations.
CAUTION:
Proper torquing of coupling bolts is required to
obtain specifed performance.
Over torquing the bolts may
result in damage to the bolt and/or casting which could
result in pipe joint separation.
Under torquing the bolts may
result in lower pressure retention capabilities, lower bend
load capabilities, joint leakage and pipe joint separation.
Pipe joint separation may result in signifcant property
damage and serious injury.
FIG. 7307 SPECIFIED BOLT TORQUE
Coupling Bolts
Minimum Maximum
In.
Ft.-Lbs./N-m
Ft.-Lbs./N-m
1
/
2
X
2
3
/
8
80
100
110
150
1
/
2
X
3
80
100
110
150
5
/
8
X
3
1
/
2
100
130
135
175
7
/
8
X
5
1
/
2
180
220
245
300
GL-2.10