UG-37 Nozzle Designing Using COMPRESS

One of the most involved tasks pressure vessel designers face is detailing nozzle openings to comply with ASME UG-37, UG-45 and UW-11. Nozzles serve many purposes including entry and exit points for process fluids, inspection access and drainage. In addition, nozzles support other equipment such as piping, relief valves, pressure gauges and agitators. Careful consideration needs to be given to pressure in combination with any other loads applied to the nozzle connection. COMPRESS easily handles all of these details and offers the most flexible and intuitive nozzle design capabilities available.

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Nozzles designed in COMPRESS with pipe elbows and flanged connections

COMPRESS Offers the Widest Range of UG-37 Nozzle Design Configurations

The first part of any nozzle design is selecting the nozzle type. COMPRESS provides the most options to choose from. Styles include uniform thickness (pipe), variable wall thickness (heavy barrel), couplings, stud pads, long weld necks and elliptical manways.  After that the attachment details can be defined. Set in, set on and intermediate attachments are available to define the joint configuration per UW-16.

COMPRESS Offers Many Different Nozzle Configurations Per UW-16

Nozzle Location and Orientation

A powerful feature in COMPRESS is the ability to specify nozzles as Radial, Tilted or Hillside (Offset). The additional Code provisions required for Tilted and Hillside nozzles are automatically applied by COMPRESS.

COMPRESS Provides Designers With Unmatched Flexibility When Specifying Nozzle Location and Orientation
Hillside, Radial, and Titled Nozzles in COMPRESS

Uniform Thickness Nozzles

COMPRESS Features Interactive Nozzle Designing With Real Time Updates and ASME Code Compliance Checks

Economical Nozzle Design Using ASME Appendix 46

With the recent addition of Mandatory Appendix 46 in ASME VIII-1 users can now take advantage of the modern design rules from ASME VIII-2. In situations where a nozzle does not pass using traditional ASME VIII-1 rules users can select the option to use the more accurate provisions of Appendix 46. A notable feature is that Appendix 46 can be specified for a single nozzle or applied to all nozzles on the vessel.

For more details on how COMPRESS implements Appendix 46 see: Appendix 46 – Using Division 2 Rules With Division 1 Allowable Stresses

Stud Pads

Stud pads provide a unique type of nozzle design by providing built-in reinforcement and tapped bolt holes that eliminate the need for nozzle to flange welding. Stud pads also have slightly different requirements per ASME VIII-1 which COMPRESS handles. Simply place the stud pad in the desired location on the vessel and let COMPRESS do the rest.

Blinds can also be added to any stud pad to complete your design.

COMPRESS Nozzle Design Includes Stud Pads
Nozzle Studding Outlet Dialog in COMPRESS

Nozzle Connections

COMPRESS includes the handy ability to add B16.11 couplings, B16.9 elbows, reducers, pipe caps, tees, pipe extensions to nozzles.  In addition, Appendix 2 or B16.5/B16.47 flanges may be attached to nozzles and nozzle extensions as well.

COMPRESS Nozzle Attachments Include ASME B16.9 Elbows, Reducers, Pipe Caps, Tees, B16.11 couplings and B16.5\B16.47 Flanges
Nozzle Connections in COMPRESS

Designing For Piping Loads Using WRC-107/537

Nozzles serve as the entry and exit ports for vessels. With this comes piping connections and pipe loadings. Industry practice for many years has been to use the method from WRC-107 (now WRC-537) to assess the stresses on the shell due to these loadings. COMPRESS provides the WRC Local Stress option for each nozzle with the ability to set up multiple load cases. The API-660 (heat exchanger) load library is available along with the ability to set up your own data set of nozzle design loadings for future use.

Stresses resulting from the loads entered are shown on the WRC dialog which allows the designer to make adjustments as needed.

Nozzle Design Loads in the WRC 537 Dialog in COMPRESS

Static Head Determination

Once a liquid level has been input, the associated static liquid head is automatically accounted for when designing nozzles (or any component) in COMPRESS. This means that whenever a nozzle is relocated or the liquid level is changed the static pressure is automatically updated everywhere in the vessel design.

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Changing the Normal Operating Liquid Level (NLL) will cause COMPRESS to update the static head applied to all affected vessel components including nozzles.

Nozzle Plan View and UG-37 Overlapping Limits of Reinforcement

Certain types of equipment, such as reactors, have many closely spaced nozzles located on the head. An area of concern in these cases is the potential for overlapping limits of nozzle reinforcement. COMPRESS provides a convenient Plan View to see if any overlapping limits of reinforcement are present.

Closely Spaced Nozzles With External Loads Designed in COMPRESS.
Checking For Overlapping Limits of Nozzle Reinforcement With the COMPRESS Plan View

Overlapping limits warnings are provided in the output report and designers can manually adjust the limits for any nozzle. If multiple nozzles meet the size and spacing criteria of UGF-36 then COMPRESS will exempt certain nozzles from the reinforcement requirements of UG-37 (Nozzle Clusters).

Some of the Nozzle Calculation Options in COMPRESS

Different Pressures Can Be Used

By default, COMPRESS will automatically use the parent component’s design pressure as the nozzle design pressure. Due to certain processes sometimes a different pressure needs to be used to design the nozzle. In these circumstances COMPRESS provides an option to specify different pressures for the shell and the nozzle.

Nozzle And Shell Design Pressures Can be Set to Different Values in COMPRESS

Detailed Nozzle Design Reports

COMPRESS provides fully detailed, professional looking nozzle calculation reports for engineering review.  Does your AI or customer want to see how your UG-45 wall required thickness or UG-37 required area was arrived at? COMPRESS has you covered.

An Excerpt From a COMPRESS Nozzle Calculation Report Showing UG-45 and UG-41

Quick Nozzle Design

COMPRESS offers the ability to quickly add nozzles on any vessel by dragging and dropping. This provides rapid model generation when creating cost estimates or initial starting points for more detailed pressure vessel engineering designs.

Nozzle Drag and Drop Quick Design in COMPRESS

COMPRESS Pressure Vessel Design Highlights

Nozzles Nozzles in COMPRESS Nozzles Simplify the detailing of nozzle attachments with flexible and intuitive nozzle design capabilities. Quick Design Quick Design Speed up the process of pressure vessel modeling. Pressure vessel quick design mode in COMPRESS Productivity Productivity Software packages like COMPRESS exist to increase productivity and save Engineering hours. Software packages like COMPRESS exist to increase productivity and save engineering hours Heat Exchanger Heat Exchanger Perform ASME UHX and TEMA calculations and transfer these designs to your estimating and drafting departments. Heat Exchanger design in COMPRESS Div 2 Division II Many companies use the alternative rules of Division 2 because of the cost savings, versus Division 1. Division 2 Class 1 and 2 in COMPRESS MDMT MDMT Rules of UCS-66 The rules of UCS-66 guard against vessel failure by brittle fracture, a low probability high consequence event. Minimum Design Metal Temperature (MDMT) in INSPECT Ext Pressure External Pressure Design Simplify the complexity of
UG-28 rules for external pressure of 15psig and greater.
Pressure Vessel External Pressure
Jacketed Vessels Jacketed Vessels Design both conventional and half pipe jacketed vessels as a standard feature in COMPRESS. Jacketed Vessels in COMPRESS - Type 1 and 2 Vessel Wizard Vessel Wizard The Vessel Wizard speeds pressure vessel design by creating complete pressure vessel models with minimal input. COMPRESS vessel wizard Coster COSTER Import files from COMPRESS and create user customizable pressure vessel cost estimates in spreadsheet format. Generate pressure vessel cost estimates in Excel spreadhseets Flange Flange Design Create optimized Appendix 2/ASME B16.5/16.47 flange designs with minimal time and effort. Flange Pair design in COMPRESS Weld Seam Weld Seams Designers can visually confirm good practices such as staggered longitudinal seams. Pressure Vessel Weld Seams Lifting Rigging Lifting & Rigging Use an accurate weight, the correct center of gravity, and apply the actual section properties. Lifting and Rigging Analysis 3D CAD Modeling + Drawings The Codeware Interface includes Drafter 3D, a feature that auto-generates 2D pressure vessel drawings. Export pressure vessels into 3D CAD applications such as SOLIDWORKS and Autodesk Inventor CWI SW Model True SOLIDWORKS Model True SOLIDWORKS Models Sketches, operations and drawings can be manipulated as if the model had been created manually in SOLIDWORKS. Related Codes Related Codes COMPRESS implements a wide range of related engineering methods, codes and standards. COMPRESS and INSPECT implement a wide range of related engineering methods, codes, and standards Design Mode Design Mode Save time by reducing the trial and error iterations that would otherwise be required when designing pressure vessels. In Design Mode, select thicknesses, sizes and ratings to meed code requirements Rating Mode Rating (Analysis) Mode The COMPRESS Rating Mode takes your design and determines the vessel’s MAWP, MAEP and MDMT. Calculate MAWP and minimum thickness in rating input mode Hydrotest Hydrotest Performing hydrotest stress calculations in the design stage prevents equipment damage during hydrotesting. Hydrostatic Test Stress Calculations Hillside Hillside Nozzle COMPRESS saves time by calculating chord openings and governing planes of reinforcement automatically. Hillside Nozzle ASME Codes ASME Editions Older ASME Codes are retained in all COMPRESS releases so you can always use the latest software. 2019 ASME Code edition in COMPRESS NLL Automatic Liquid Levels COMPRESS eliminates the need to manually calculate each vessel component’s liquid static head. COMPRESS automatic liquid level feature saves time and reduces errors Loads Global External Loads The Loads Menu allows designers to easily consider global external loads when sizing pressure vessel supports. Global external loads on pressure vessel supports in COMPRESS Clips and Lugs Clips and Lugs Designers can quickly include the mechanical effects of pressure vessel internals and attachments in their designs. Pressure vessel attachments in COMPRESS include platforms, ladders, insulation, piping, clips, and lugs Stacked Stacked Vessels Certain industrial processes require pressure vessels with multiple chambers operating under different design conditions. Multiple pressure chamber stacked vessel design in COMPRESS CC 2695 Appendix 46 Produce more economical Div 1 pressure vessel designs with increased accuracy from the Div 2 design by rule equations. Code Case 2695, now known as ASME VIII Appendix 46 Data Reports Manufacturer's Data Reports Simplify the creation, submission and management of ASME Manufacturer’s Data Reports and NBIC Repair and Alteration Forms. Forms Default Settings in COMPRESS Skirt Openings Support Skirt Openings Specify piping connections to vertical vessels that require additional piping and openings cut out of the support skirt. Skirt Opening in COMPRESS Foundation Loads Foundation Loads Summary Break down the loads for the specified vessel operating conditions including weight, wind, seismic, and vortex shedding. Help pressure vessel designers provide loadings to their civil and structural engineering team members using Pressure Vessel Foundation Loads Summaries in COMPRESS Shipping Shipping Saddles Shipping Saddles in COMPRESS COMPRESS provides a shipping saddle option based on the industry standard Zick Analysis. UG 80 and 81 UG-80 and UG-81 COMPRESS automatically provides out-of-roundness tolerances that must be maintained during pressure vessel fabrication. API 579-1 Part 8 Out of Roundness

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