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technical data
Introduction
Couplings
Outlets
Fittings
Val
ves &
Accesso
ries
HighPressure
Advanced CopperMethod (IPS)
DI-LOK
®
Nipples
Plain-EndFittings
HDPECouplings
Sock-It
®
Fittings
StainlessSteel Method
Roll
Groovers
Installation& Assembly
SpecialCoatings
DesignServices
Technical
Data
Master Format3 Part Specs.
PictorialIndex
CTS Copper
System
www.anvilintl.com 199
EXAMPLE 4
Anchor at “A” to support weight of vertical water column. Use spring
hanger at “D” and “E” to allow movement of vertical piping.
Anchors at “B” and “C” if offsets at L1 and L2 are insuffciently long to
handle expected pipe movements.
LATERAL RESTRAINT
EXAMPLE 5
A grooved coupling joint installed in a partially defected condition
between anchor locations will defect to its fully defected condition
when pressurized. Hangers and supports must be selected with
consideration of the hanger’s capability to provide lateral restraint.
Light duty hangers, while acceptable in many installations, may
defect against the application of lateral forces and result in “snaking”
conditions of the pipe system.
RISER DESIGN:
Risers assembled with Gruvlok Flexible couplings are generally
installed in either of two ways. In the most common method,
the pipe ends are butted together within the coupling joint. Note
that when installing risers, the gasket is frst placed onto the
lower pipe and rolled back away from the pipe end prior to
positioning the upper pipe. Anchoring of the riser may be done
prior to pressurization with the pipe ends butted or while
pressurized, when, due to pressure thrust, the pipe ends will be
fully separated.
An alternative method or riser installation is to place a metal
spacer of a predetermined thickness, between the pipe ends
when an additional length of pipe is added to the riser stack.
The upper pipe length is anchored, the spacer removed and the
coupling is then installed. This method creates a predetermined
gap at each pipe joint which can be utilized in pipe systems
where thermal movement is anticipated and in systems with rigid
(threaded, welded, fanged) branch connections where shear
forces due to pressure thrust could damage the rigid connections.
The following examples illustrate methods of installing commonly
encountered riser designs.
RISERS WITHOUT BRANCH CONNECTIONS
Install the riser with the pipe ends butted.
Locate an anchor at the base of the riser
(A) to support the total weight of the
pipe, couplings and fuid. Provide pipe
guides on every other pipe length, as a
minimum, to prevent possible defection
of the pipe line at the coupling joints as
the riser expands due to pressure thrust
or thermal growth. Note that no
intermediate anchors are required.
When the system is pressurized the pipe
stack will “grow” due to pressure thrust
which causes maximum separation of
pipe ends within the couplings. The
maximum amount of stack growth can be
predetermined (see Linear Movement). In
this example the pipe length “L” at the
top of the riser must be long enough to
permit suffcient defection (see Angular
Movement) to accommodate the total
movement “M” from both pressure thrust and thermal gradients.
RISERS WITH BRANCH CONNECTIONS
Install the riser with the predetermined gap
method. Anchor the pipe at or near the base with a
pressure thrust anchor “A” capable of supporting
the full pressure thrust, weight of pipe and the fuid
column. Anchor at “B” with an anchor capable of
withstanding full pressure thrust at the top of the
riser plus weight of pipe column. Place intermediate
anchors “C” as shown, between anchors “A” and “B”.
Also place intermediate clamps at every other pipe
length as a minimum.
When this system is pressurized, the pipe move-
ment due to pressure thrust will be strained and
there will be no shear forces acting at the branch
connections.
COUPLING FLEXIBILITY (CONT.)
L 2
L1 E
C
A
D
B
VERTICAL
COLUMN
VERTICAL
COLUMN
HORIZONTAL
RUN
System with no pressure
partially deflected
System pressurized
fully deflected
A
L
M
C
C
B
C
A
GL-2.10