Page 133 - GRINNELL Mechanical Grooved Piping Products EMEA

Pressure and Design Data
Thermal Movement
Tech Data Sheets: G810, G820, G830
Activation Force
Pipe Size mm Inches
Activation Force N
Lbs.
42.4
156
The following guidelines are similar to any
expansion joint:
It is recommended that anchors be installed at changes of direction on the pipe lines to control the pipe movement. The thermal expansion/contraction in the piping system can be accommodated using GRINNELL Flexible Couplings. In designing anchoring systems, it is suggested that the following be taken into consideration:
• Pressure Thrusts
• Frictional Resistance of Any Guides or Supports
• Centrifugal Thrust Due to Velocity at Changes of Direction
• Activation Force Required to Compress or Expand a Flexible Coupling
Three methods are available as examples to
accommodate thermal expansion/contraction:
(1) Design the system with rigid couplings and place expansion joints at the proper locations. Expansion joints may be a series of flexible grooved couplings of a sufficient quantity to accommodate the movement.
(2) Design the system with flexible and/or rigid couplings and allow the pipe to move in directions desired, with the use of anchors and guides if
so required. With this method, it is important to ensure that movement at branch connections, changes of direction, equipment hookup, etc.,
will not cause damage or harmful stresses.
(3) Design the system with flexible couplings utilising the expansion/contraction capabilities of these products.
The following example illustrates this method:
• 150mm (6") Schedule 40 steel pipe, roll grooved, 45.7m (150') long, anchored at each end
• Maximum Temperature = 93.3°C (200°F)
• Minimum Temperature = 4.4°C (40°F)
• Install Temperature = 26.6°C (80°F)
11⁄4 35 11⁄2 45 2 70
21⁄2 100 76,1mm 110 3 145 4 240 5 375 165,1mm 500 6 520 8 880
10 1365 12 1915
48.3
200
60.3
311
73.0
645
76.1
489
88.9
645
114.3
1068
141.3
1668
165.1
2224
168.3
2313
219.1
3914
273.0
6072
323.9
8518
Anchor Position
Expansion Joint Fig. 7550
Intermediate
G
G
G
u
u
u
i
i
i
d
d
d
e
e
e
s
s
s
Anchor Position
Intermediate Guides
Flexible Couplings
Intermediate Guides
133