Professional Blogs

NozzlePRO v12.0

Leave a comment

Finite Element Analysis provides the right answer.

NozzlePRO addresses many needs of PVP engineers working in today’s market.
Typical pressure vessel design codes, such as ASME Section VIII, cannot address all design cases. For instance, external loads on nozzles are not addressed within the Code. In such cases, engineers need to go outside of the Code and apply recognized design procedures such as finite element analysis using NozzlePRO. Simplified calculation methods commonly used in the PVP industry such as WRC 107/297 are based on limited test data and are known to be inaccurate in many cases. NozzlePRO provides realistic
answers for all cases.

  • NozzlePRO is designed to quickly and easily evaluate nozzles, saddles, pipe shoes an clips. A variety of head types are allowed including spherical, elliptical, ASME,
    dished, cylindrical and conical.
  • NozzlePRO offers optional axisymmetric and brick modeling capability for select geometries, permitting a more accurate analysis of cyclic pressure stresses in
    thick-walled geometries.
  • NozzlePRO permits the user to pipe away from any NozzlePRO piping junction into a head or cylinder. Straight sections, elbows, bends, intersections and linear restraints may be included in the analysis.


New Features in Version 12.0



Model Generation
New Drawing Tools allow for graphical “CAD-like” modification of shell model details and addition of model components. Interactive Output Processing – MimOut Multiple models can be reviewd simultaneously on a regionby-region basis. All reports can be sent to Word or Excel.

Analysis & the Codes

  • Support for ASME VIII-2 Part 5 Nonlinear Analysis
  • MultiCore SuperNode Solver (4-to-8 times faster)
  • Automatic Generation of B31.d SSIs or B31.1 replacement for .75i per B31J
  • Updated Allowable Load Algorithm for Pipe Shoes & Saddles
  • Steady State & Transient Thermal Gradient of Pipe Shoes, Saddles & Structural Elements
  • Directives for EN13445 Local Stress Analysis
  • Automatic Nonlinear Calculation of ASME VIII
  • ASME B31J Nozzle Stress Calculations (STP-PT-074) – use PRGiK

Plasticity Solution

  • Reinhart Elastic-Plastic Ratcheting Evaluation
  • Twice Yield Fatigue Evaluation
  • Automatic Nonlinear Calculation of ASME VIII-2 Para ep/eL ratio
  • Automatic Collapse & Twice Elastic Analysis
  • All shell templates can be analyzed using the VIII-2 Part 5 Nonlinear Solver.

Fitness for Service

  • Latest Version of API-579 / FFS-1 & Enhanced Local Thickness Modeling
  • J Integral Calculations
  • RSF Factor for Elastic FFS


  • Pipe Shoe Library provided by Piping Technology & Products


  • When there are multiple thermal or operating loads
    acting on a nozzle.
  • When the d/D ratio for a loaded nozzle is greater than
    0.5 and WRC 107 or 297 is considered for use.
  • When the t/T ratio for a loaded nozzle is less than 1.0
    and WRC 107 or 297 is considered for use.
  • When the nozzle is pad reinforced and WRC 107 or 297
    is considered for use.
  • When there are loads acting on a nozzle and run pipe
  • When the number of full range pressure cycles is
    greater than 7000 and the nozzle is subject to external
  • When the D/T ratio is greater than 100 and SIFs or
    flexibilities are needed for a pipe stress program.
  • When the D/T ratio is greater than 100 and a dynamic
    analysis including the nozzle is to be performed using a
    piping program.
  • When a large lug is used in a heavily cyclic service.
  • When pad reinforced lugs, clips or other support are
    placed on the knuckle radius of a dished head. WRT
    107 simplifications for pad reinforced rectangular lug
    attachments are fraught with potentially gross errors.
  • When seismic horizontal loads on vessel clips or box
    supports are to be evaluated.
  • When pad reinforced hillside nozzles subject to
    pressure and external loads.
  • When evaluating large run moments, but small branch
    moments in a piping system.
  • When there are overturning moments on skirts.
  • When the effect of integral vs. non-integral pad on
    nozzle in head should be studied.
  • When there are different thermal expansion
    coefficients or temperatures between the header and
  • When the loads on nozzles are high because of the
    assumption that the nozzle connection at the vessel is
    a rigid anchor.
  • When there is heat transfer in axisymmetric model
  • When the effect of adding a radius to weld geometries
    on nozzles in heads should be investigated.
  • When the analyst needs to run various model types,
    comparing results to determine the stability and
    accuracy of the solution.
  • When horizontal vessels are saddle supported, with or
    without wear plates, and including tapered saddles
    with many design options.
  • When evaluating the effects of axial or transverse
    loads due to internal sloshing, wind loads, seismic
    loads, or general external loads. Zick’s methods do
    not consider either axial or transverse loads.
  • When designing pipe shoes for self-weight, liquid
    weight and axial loads.


Fitness for service

NozzlePRO performs Level 1, Level 2, and Level 3-Type API 579 calculations. The local
thinning area approach is employed to satisfy the Level 3-Type analysis. Multiple flaws
are allowed in the analysis. PRG has added J Integral calculations and RSF Factor for
elastic FFS.

Crack prediction tool

PRG ran a series of fatigue tests tracking crack propagation. This data, in conjunction
with past theories of crack initiation and propagation were used to develop an algorithm
based on the stress level to predict the mean cycles to through wall crack. If the elastic
Level 3 analysis fails, then an elastic-plastic method can be used to satisfy the code
(based on ASME Section VII-2 Part 5.


NozzlePRO included module

MATPRO is PRG’s materials database which includes high temperature curves, allowable stress plots, NH reporting, creep-fatigue interaction
diagrams, elastic-plastic stress strain curves, and fatigue curves generated as a function of creep temperature.

NozzlePRO service plan modules

These modules were designed to add increased ease-of-use & design for the most common analysis needs and are included with an active NozzlePRO v12.0 service plan.

  • FE107 v2.7 uses FEA technology to provide stress analysis of nozzle connections on piping and pressure vessels. Output is compared directly to WRC 107 and WRC 297 results.
  • FESIF v2.7 is an FEA based program that automatically calculates stress intensification factors (SIFs) and flexibility factors for a wide variety of piping intersections not covered by the B31 piping codes.
  • FETEE v1.5 evaluates i-factors, k-factors and loads for FEA models of contoured fittings.


Zdroj: PRG – Paulin Research Group




Leave a Reply

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s