STAAD.foundation Help 3.4 Heat Exchanger Foundation Total six types of Heat Exchanger are allowed to design. They are Stacked Exchanger combined footing option, isolated footing option, strap beam option and Single Exchanger combined footing option, isolated footing option, strap beam. Exchanger Geometry page Footing Geometry page Beam Geometry page Primary Load page Wind Load Generation page Seismic Load Generation page Load Combination page Design Parameters page Page 1 of 13 Heat Exchanger Foundation 12/3/2015 file:///C:/Users/bipik/AppData/Local/Temp/~hhB7BF.htm
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3.4 Heat Exchanger Foundation
Total six types of Heat Exchanger are allowed to design. They are Stacked Exchanger combined footingoption, isolated footing option, strap beam option and Single Exchanger combined footing option, isolated footing option, strap beam.
Used to input all the geometric data for the Heat Exchanger.
Clicking on any input fields creates a description of the corresponding field below the diagram.
Exchanger / Vessel Type Select either a Single Exchanger or Stacked Exchanger, for the type of heat exchanger vessel will be supported by the foundation.
Footing Type Combined Footing - footing will be designed as monolithic footing connecting two piers. Design
philosophy is same as combined footing from General Mode.
Isolated Footing - footing will be designed as two isolated footing supporting each pier. These footing can be made identical from footing geometry page. Design philosophy is same as isolated footing from General Mode.
Strap Beam (Isolated Footing type only) Exchanger footing will be designed as two isolated footing below thepiers connected by a strap beam.
Bottom of Footing Elevation (B.O.F.)Bottom of footing elevation is used for detail drawing purpose. Based on this input elevation at top of concrete (T.O.C.), elevation at top of soil (T.O.S) and elevation at top of pedestal (T.O.P.) are displayed in detail drawing
Unit of length for all the input in this page only.Heat Exchanger Length (L)
Length of the heat exchanger. Upper Exchanger Diameter (UD)
(Stacked Exchanger only) Diameter of the upper exchanger. Lower Exchanger Diameter (LD)
Diameter of the lower exchanger or, if a Single Exchanger, the diameter of the sole exchanger.Height from Pier Top to Upper Exchanger (H)
Height from the top of the pier to the center line of the upper exchanger. For a single exchanger, the height is measured to the center line of the single vessel.
Soil Depth (SD) Depth of soil from top of the footing.
Height of Pier Top from Base (B) Height from the top of the pier to the base of the foundation.
Spacing of Exchanger (S) (Stacked Exchanger only) Spacing of the central line of the exchanger in case of stacked exchanger.
Next >
Proceeds the Wizard to the next step.
Cancel
Exits the Wizard without creating a new Heat Exchanger Footing job.
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Footing Geometry page
This page will have a different set of parameters displayed depending on the Footing Type selected on the Exchanger Geometry page.
Exits the Wizard without creating a new Heat Exchanger Footing job.
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Beam Geometry page
Used to specify grade beam geometry for isolated footings connected by a strap beam.
Here UDL with unit over beam option is available. Max & Min Depth Range of Beam, Width of Beam (with unit input), Main Bar Range, Stirrup Bar Range, Stirrup Type (Number of legs), Stirrup Spacing Range ( with input) are available in this page.
Beam Loading - UDL On Beam
Specify a uniform dead load applied over the length of the grade beam, in the selected units.
For example, this may be the weight of a wall load over the beam.
Min / Max Depth
Enter the range of beam depth permissible for design, in the selected units. The design process will begin with the minimum depth and iterate designs up to and including the maximum depth specified.
Force Unit Select a unit for all axial loads specified on this page.
Moment Unit Select a unit for all moment loads specified on this page.
Heat Exchanger Loads
Six types of axial forces are used for input. They are:
Empty Load - Exchanger assembly Weight in empty condition Operating Load - Exchanger assembly weight with fluids at operating level condition Test Load - Exchanger assembly weight with fluids at test level condition Live Load - Superimposed live load on exchanger assembly e.g. platform live load attached
to the exchanger Erection Load - Construction loading on exchanger assembly e.g. crane loading Miscellaneous Axial Load Thermal load - Load generated by thermal expansion of exchanger assembly, thermal load
is entirely applied at fixed end Bundle Pull - Axial couple loading is considered on piers for Bundle pull force. Lateral load
imposed on exchanger assembly under maintenance procedure, program distributes bundle pull force equally on piers.
Application of all primary load is in accordance with PIPSTE03360
The program generates axial, lateral forces and moments based on primary load input. Additional loading can be entered through user defined moment.
User Defined Moment
Four types of moments are used for input. They are:
Empty Moment Operating Moment Longitudinal Miscellaneous Moment Transverse Miscellaneous Moment
Direct inputs are always applied at top of pedestal (bottom of base plate), it is per industry standards. Vendors provide the loads at bottom of base plate of vessel. All program generated loads are applied at center of vessel.
Pedestal Load Distribution %
Give the load distribution percentage for “Shell End” and “Channel End”. Channel End is usuallyconsidered as sliding end and Shell End is considered as fixed end.
Vertical loads are not affected by pedestal type (fixed or sliding). Vertical loads are distributed per pedestal load distribution percentage. Conventionally channel end is heavier than shell end. Standard percentage of distribution for vertical loads is - Channel End 60% & Shell End 40%.
Design Self Weight
This option enables user to select self weight of the footing, self weight of the pedestal and self weight of the soil above footing to be considered for reinforcement design or not.
Self weight is always considered for service checks.
Self Weight Factor Coefficient of calculated self weight for use in dead load cases. Further to design self weight option, self weight considered can be modified using this factor.
Slide Plate Parameter
Sliding plate coefficient only affects the seismic loads on exchanger assembly.
Slide plate coefficient of friction is used to determine % longitudinal lateral loads distributed on Shell End and Channel End.
Per PIPSTE03360 4.3.2.3, for low friction plates (α≤0.2) entire earthquake load is applied onfixed pier (Shell End). In case of high friction plates (α ≥0.2), 70% of earthquake load applied on fixed pier.
< Previous
Steps the Wizard to the previous step.
Next >
Proceeds the Wizard to the next step.
Cancel
Exits the Wizard without creating a new Heat Exchanger Footing job.
Inputs for wind load can be given in two ways. You can directly input the shear force & moment values with choosing the proper unit or you can use the software to calculate those values using ASCE 7-2005.
User Defined Wind Load
Program Calculated Wind Load
Partial Wind Case % This value represents percentage of full wind speed used in case of test load or erection load combination. As probability of getting full wind speed while test is being carried out is very low.
< Previous
Steps the Wizard to the previous step.
Next >
Proceeds the Wizard to the next step.
Cancel
Exits the Wizard without creating a new Heat Exchanger Footing job.
Used to input seismic load data, either directly or by parameters which the program will then use to calculate code-specified seismic loads per ASCE 7-2005.
Directly Input Seismic Loads
Select this option to specify values for shear force and moment. Otherwise, seismic load generation parameters are required to generate loads.
Exits the Wizard without creating a new Heat Exchanger Footing job.
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Load Combination page
Used to generate combinations of primary load cases for use in analysis and design. Two types of load combinations are used here. They are “Allowable Load Combination” and “Ultimate Load Combination”. You can create any number of load combinations.
Load Combination Table
Select either of the two code specified load combinations or input your own.
ASCE 7-05 PIP STC01015 User defined
Update Table
Default load combinations are saved in external data files (ACILOAD.INI files). Clicking the Update Table button saves any changes made to the associated table to the file as a default. Otherwise, any changes are saved in the active project file only.
Delete
Removes the selected row (load combination) from the associated table.
To delete any combination from the default list (kept in an external .INI file) you need to click theUpdate Table button after deleting.
Allowable Load Combination and Ultimate Load Combination tables
Each row in a table represents the ID for a different load combination.
Index - The first column indicates the index of the load combination. toggle - Select the check boxes of the combination which you wish to use. Load Type columns - Primary Load cases are assigned a load type, each of which is
represented by a separate column in the load combination tables. Enter the load combinationfactor for a given load type in the cell.
The cell with zero values appears in gray color where as with values other than zero itappears in blue.
To add a new load combination to the table, add factors to the last (empty) row.
To add or change any combination from the default list (kept in an external .INI file) you need to click the Update Table button after making changes.
< Previous
Steps the Wizard to the previous step.
Next >
Proceeds the Wizard to the next step.
Cancel
Exits the Wizard without creating a new Heat Exchanger Footing job.
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Design Parameters page
Used to enter design parameters for the Heat Exchanger footing; including reinforced concrete, soil, and safety factors.
