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technical data
Introduction
Couplings
Outlets
Fittings
Val
ves &
Accesso
ries
HighPressure
Advanced CopperMethod (IPS)
DI-LOK
®
Nipples
Plain-EndFittings
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®
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SpecialCoatings
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Technical
Data
Master Format3 Part Specs.
PictorialIndex
CTS Copper
System
www.anvilintl.com 191
MOVEMENT-APPLICATIONS (CONT.)
CURVE LAYOUT: COMBINED LINEAR & ANGULAR MOVEMENT:
Utilizing the angular defection at each coupling joint curves may be laid
out using straight pipe lengths and Gruvlok Couplings.
The clearance in the grooved coupling joint, will allow a limited capability
for combined linear and angular movement. A partially defected joint
will not provide full linear movement capability. A fully detected coupling
joint provides no linear movement capability. The Gruvlok coupling will
not allow for both maximum linear and maximum angular movement
simultaneously.
In systems where both are expected, additional joints may be required.
This example shows how to calculate the curve radius, required pipe
lengths, and number of required couplings.
R = L/(2 x Sin(0/2))
L = 2 x R x Sin(0/2)
N = T/0
WHERE:
N = Number of Couplings
R = Radius of Curve (feet)
L = Pipe Length (feet)
0 = Defection from centerline (Degrees) of each Coupling
(See coupling performance data, value to be reduced by Design Factor)
T = Total Angular Defection of all Couplings.
DRAINAGE, BURIED SYSTEMS, ETC.:
The fexible design of the Gruvlok coupling makes it ideal for use in a wide
variety of systems in which random changes of the pipe direction can be
accommodated by the Gruvlok coupling’s angular defection capability
rather than requiring the use of special fttings.
Pitched drainage systems, buried pipe systems where pipe laying conditions
are subject to settlement, and exposed pipe systems laid on rough
ground are but a few of the many types of pipe installations that present
conditions where the functional capability of the Gruvlok coupling are
useful.
NOTE: Fully Defected Joint Will Not Allow For Linear Expansion.
In the example above, two couplings were added to account for thermal
expansion and the other couplings accommodate only the misalignment.
The additional stress from the combined movement is therefore relieved.
ROTATIONAL MOVEMENT:
Piping systems designed with Gruvlok Couplings can accommodate minor
rotational movement from thermal expansion, settlement, vibration, or
other similar movements. However, Gruvlok Couplings should never be
used as a continuous swivel joint.
Utilizing the rotational capability of the Gruvlok Coupling, the pipe life of a
slurry or similar coarse material piping system can be extended.
For pipe rotation, the system must be shut down and internal pressure
relieved.
The pipe may then be rotated one-quarter turn, the couplings retightened,
and service resumed. If performed on a regular basis, pipe rotation will
evenly distribute wear over the entire inner surface of the pipe.
Example:
R
R
R
L
T = N x θ
θ
Pitched for Drainage
Buried Pipe Systems
For Deflection
For Expansion
Before Pipe Rotation After Pipe Rotation
GL-2.10