Bab 08 Hanger
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Transcript of Bab 08 Hanger
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7/29/2019 Bab 08 Hanger
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Chapter VIII Hangers
EDC - ITBTraining on Caesar II
1
BAB VIII
HANGERS
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Chapter VIII Hangers
EDC - ITBTraining on Caesar II
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8.2 Simple Hanger Design
No additional input
Globally (in hanger
control)locally (on each
hanger auxiliary data
area)
Note that a number of the parameters
from the hanger control sheet also show
up on the individual hanger auxiliary
data fields.
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Chapter VIII Hangers
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8.3 Single Can Design
distance betweenthe pipe support and the
concrete foundation, or
baseplate.
Indicate that the pipe is supported from
below by entering a negative number in the
Hanger/Can Available Space field on the
hanger spreadsheet.
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Chapter VIII Hangers
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8.4 Constant Effort Support Design
Constant effort support
Very small allowable travel
0.01 in
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Chapter VIII Hangers
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8.5 Inputting Constant Effort Supports (No Design)
1. Enter the constant effort
support load (per hanger)
in the Predefined Hanger
Data field.
2. Enter the number of
constant support hangers at
the location.
Step :
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Chapter VIII Hangers
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8.6 Entering Existing Springs (No Design)
1. Enter the Spring Rate and
the Theoretical Cold Load
(installation load, on a per
hanger basis) in the
Predefined Hanger Data
fields.
2. Enter the number of
Variable Support Hangersat the location.
Step :
Theoretical Cold Load = Hot Load +
Travel * Spring Rate
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Chapter VIII Hangers
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8.7 Multiple Can Design
Positive number
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Chapter VIII Hangers
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8.8 Old Spring Redesign
the hanger table
the number of springs
at the location
the old spring rate
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Chapter VIII Hangers
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8.9 Pipe and Hanger Supported From Vessel
Connecting nodes
associated with hangers
and cans function just
like connecting nodes
with restraints.
Connecting node
displacements are
incorporated in thehanger design algorithm.
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Chapter VIII Hangers
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8.10 Hanger Design with Support Thermal Movement
The hanger at node 9 is
supported from a
structural steel extension
off of a large vertical
vessel. The vessel at thepoint where the hanger is
attached grows thermally
in the plus Y
direction approximately3.5 in.
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Chapter VIII Hangers
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8.11 Hanger Between Two Pipes
The directive Connect Geometry through CNodes must be turned off
in the
Configuration Setup to avoid plot and geometry errors.
Node on the pipe
passing overhead
Rigid element
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Chapter VIII Hangers
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8.12 Hanger Design with Anchors in the Vicinity
the anchor at 5 is freed in the Y-direction,
the anchor at 105 is freed in all directions.
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Chapter VIII Hangers
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8.13 Hanger Design with User-Specified Operating Load
In this configuration, freeing the anchors at 5 and 60 didnt help the thermal case nozzle loads.
It was postulated that, due to the stiffness of the overhead branches, the hanger calculated hot
load was not sufficient. The calculated hot load was 2376 lb. A new hot load of 4500 lb. is tried
here.
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Chapter VIII Hangers
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8.14 Spring Can Models with Bottom-Out and Lift-Off
Capability
Grinnell, fig.B268, size 10 :
theoretical cold load: 1023 lb.
spring rate : 260 lb./in.
smallest load : 910 lb.
largest load : 1690 lb.
Bottom out :
in4346.0260
1091023
rateSpring
LoadMin.TableLoadInstalled
Lift-off :
in565.2
260
10231690
rateSpring
LoadInstalledLoadTable.Max
Value for the gaps g1 = 0.4346
g2 = 0.4346 + 9.1E-6
g3 = 2.5650Min. Table Load : 910 = 9.1E-6 in
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Chapter VIII Hangers
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Example: Input for Lift-off and Bottom-out Spring Can Model (continued)
The gap field in the restraints auxiliary data area rounds off values to 3 decimal
places for display only. Internally, CAESAR II stores values to 7 digits for
calculations. Therefore the gap corresponding to the -Y restraint in this example
was input as 0.4346 + 9.1e-06 and this value will be retained in memory for
calculations.
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Chapter VIII Hangers
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8.15 Spring Hanger Model With Rods, Bottom-
Out, and Lift-Off
Grinnell, fig.B268, size 10 :
theoretical cold load: 101 lb.
spring rate : 200 lb./in.
smallest load : 600 lb.
largest load : 1300 lb.
Bottom out :
in055.2260
0601011
rateSpring
LoadMin.TableLoadInstalled
Lift-off :
in445.1200
10111300
rateSpring
LoadInstalledLoadTable.Max
Value for the gaps
g1 = 0.4346 g2 = 0.4346 + 9.1E-6
g3 = 2.5650Min. Table Load : 600 = 6.0E-6 in
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Dummy rigid modeled between nodes 10 and
15. Pipe connected to the rod through a +Y
restraint.
Example: Bottom-out and Lif t-off Spring
Hanger Model with Rods
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8.16 Simple "Bottomed-Out" Spring
Gap : x (permitted travel)
Mu : F (initial load)
Note that no hanger should be entered at the same
position as a bottomed-out spring.
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8.17 Modeling Spring Cans with Friction
A rigid element from the pipe center to the top of the can. Length
equals pipe radius + insulation thickness + shoe height + any
trunnion height.
A Cnode to connect to the spring. Except for the vertical spring
stiffness, all other DOFs are rigidly connected. A rigid element representing the spring can height.
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