Page 184 - publication

technical data
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LINEAR MOVEMENT
Sizes Roll Groove Pipe Cut Groove Pipe
1" through 31⁄2 " 1⁄16 " 1⁄16 "
4" though 24" 3⁄32 " 3⁄16 "
FLEXIBLE COUPLING
ANGULAR MOVEMENT
Designed-in clearances allow
limited defection of the pipe
joint within the coupling,
without introducing eccentric
loads into the coupling joint.
The maximum available angular
movement of Gruvlok coupling
joints is shown in the performance data for each coupling type. The
amount of angular fexibility varies for each coupling size and type. For
design purposes the published fgures should be reduced by the below
listed factors to account
for pipe, groove and
coupling tolerances.
SPECIFIED BOLT TORQUE
Specifed bolt torque is for the oval neck track bolts used on
Gruvlok couplings and fanges. 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.
NOTE: Use specifed bolt torque unless otherwise indicated on product
installation pages.
DESIGN FACTORS
Each fexible design Gruvlok coupling can provide for pipe system
movement up to the design maximum for the specifc size and type
coupling being utilized. Movement is possible in the Gruvlok coupling due
to two factors: (1) designed-in clearance between the key of the coupling
and the groove diameter and groove width, and (2) the gap between pipe
ends joined by the coupling.
MOVEMENT:
FLEXIBLE COUPLING
LINEAR MOVEMENT
Linear movement is accommodated
within the coupling by allowing the
pipe ends to move together or apart
in response to pressure thrusts and
temperature changes. The available
linear movement provided by Standard
Gruvlok couplings is shown below:
linear movement: angular movement:
RIGID COUPLINGS
Gruvlok rigid couplings Fig. 7400, Fig. 7401 and Fig. 7004 HPR are designed
to provide a joint with the attributes of a welded or fanged connection.
Therefore, these joints would remain in strict alignment and would resist
defection and linear movement during service.
FLEXIBLE COUPLINGS
Figs. 7000, 7001, 7003, 7010 are the fexible couplings provided in the
Gruvlok product line. The following information on movement applies to
these fexible couplings.
ANSI
SPECIFIED BOLT TORQUE
Bolt
Size
Wrench
Size
Specifed
Bolt Torque *
In. In. Ft.-Lbs.
3⁄8 11 ⁄16 30-45
1⁄2 7 ⁄8 80-100
5⁄8 11⁄ 16 100-130
3⁄4 11 ⁄4 130-180
7⁄8 17⁄ 16 180-220
1 15 ⁄8 200-250
11⁄8 113 ⁄16 225-275
11⁄4 2 250-300
METRIC
SPECIFIED BOLT TORQUE
Bolt
Size
Wrench
Size
Specifed
Bolt Torque *
mm mm N-m
M10 16 40-60
M12 22 110-150
M16 24 135-175
M20 30 175-245
M22 34 245-300
M24 36 270-340
ANGULAR MOVEMENT
Sizes
Design Factor
Roll Groove Cut Groove
1" through 31 ⁄2" Reduce 50% Reduce 50%
4" though 24" Reduce 50% Reduce 25%
* Non-lubricated bolt torques
* Non-lubricated bolt torques
Represents Linear
Movement Capabilities
θ
θ/2
GL-2.10