Pressure Vessel Supports and External LoadsPaul Daniel2019-06-05T08:02:00-04:00
External Loads on Pressure Vessel Supports
Specifying a wind or seismic code in COMPRESS directs it to perform a UG-22 analysis of the combined effects of pressure, weight, wind and seismic loads. But what about other global loads that commonly act on pressure vessels? Addressing these other types of loads is accomplished in COMPRESS by using the Loads Menu.
The COMPRESS Loads Menu allows designers to easily consider the effects of additional global external loads on pressure vessels. For the purposes of this discussion, global external loads are those loads other than pressure, weight, wind or seismic that produce general primary stresses in the pressure vessel supports. Similarly, local loads give rise to local stresses in individual pressure vessel components. Further information on how COMPRESS analyzes local loads can be found here.
Global external loads in COMPRESS are broken down into two broad categories. The first, called a lateral force, is assumed to have no mass, does not add to the vessel’s weight and does not change its period of vibration. A common example of a global lateral force would be the piping load acting on a tower’s lower pipe support. The second is listed as a vertical load in the Loads Menu. Vertical loads do change the supported weight, often add an eccentric moment and change the equipment’s natural frequency, seismic and vortex shedding responses. A piece of equipment mounted directly on the pressure vessel, such as a reboiler, is a common example of a vertical load in COMPRESS. The COMPRESS Loads Menu feature:
Lets you specify as many lateral forces and vertical loads as you want
Allows you to specify if the load acts in one or all of the operating, empty and test cases
Combines the lateral forces and vertical loads with the loads due to pressure, weight, wind and seismic
Calculates the effects of the load combinations on pressure components such as cylinders and transitions
Determines the global external load’s effects on pressure vessel supports including skirts, legs and lugs
Calculates the external load’s effects on skirt base rings, leg base plates, anchor bolts and foundations
Simplify the detailing of nozzle attachments with flexible and intuitive nozzle design capabilities.
Speed up the process of pressure vessel modeling.
Software packages like COMPRESS exist to increase productivity and save Engineering hours.
Perform ASME UHX and TEMA calculations and transfers these designs to your estimating and drafting departments.
Many companies use the alternative rules of Division 2 because of the cost savings, versus Division 1.
MDMT Rules of UCS-66
The rules of UCS-66 guard against vessel failure by brittle fracture, a low probability high consequence event.
Pressure vessel FEA is more accurate than the methods of WRC-107, WRC-297 or WRC-537.
Design both conventional and half pipe jacketed vessels as a standard feature in COMPRESS.
The Vessel Wizard speeds pressure vessel design by creating complete pressure vessel models with minimal input.
Import files from COMPRESS and create user customizable pressure vessel cost estimates in spreadsheet format.
Create optimized Appendix 2 (custom or body) flange designs with minimal time and effort.
Designers can visually confirm good practices such as staggered longitudinal seams.
Lifting & Rigging
Use an accurate weight, the correct center of gravity, and apply the actual section properties.
Modeling + Drawings
The Codeware Interface includes Drafter 3D, a feature that auto-generates 2D pressure vessel drawings.
COMPRESS implements a wide range of related engineering methods, codes and standards.
Save time by reducing the trial and error iterations that would otherwise be required when designing pressure vessels.
Rating (Analysis) Mode
The COMPRESS Rating Mode takes your design and determines the vessel’s MAWP, MAEP and MDMT.
Performing hydrotest stress calculations in the design stage prevents equipment damage during hydrotesting.
COMPRESS saves time by calculating chord openings and governing planes of reinforcement automatically.
Older ASME Codes are retained in all COMPRESS releases so you can always use the latest software.
Automatic Liquid Levels
COMPRESS eliminates the need to manually calculate each vessel component’s liquid static head.
Global External Loads
The Loads Menu allows designers to easily consider global external loads when sizing pressure vessel supports.
Clips and Lugs
Designers can quickly include the mechanical effects of pressure vessel internals and attachments in their designs.
Certain industrial processes require pressure vessels with multiple chambers operating under different design conditions.
Produce more economical Div 1 pressure vessel designs with increased accuracy from the Div 2 design by rule equations.
Manufacturer's Data Reports
Simplify the creation, submission and management of ASME Manufacturer’s Data Reports and NBIC Repair and Alteration Forms.
Support Skirt Openings
Specify piping connections to vertical vessels that require additional piping and openings cut out of the support skirt.
Foundation Loads Summary
Break down the loads for the specified vessel operating conditions including weight, wind, seismic, and vortex shedding.
COMPRESS provides a shipping saddle option based on the industry standard Zick Analysis.
UG-80 and UG-81
COMPRESS automatically provides out-of-roundness tolerances that must be maintained during pressure vessel fabrication.