ASME Boiler & Pressure Vessel Code VIII/Div.1

compliant to Pressure Equipment Directive (PED)



Pressure vessel design according ASME

The internationalization of industry and economy requires also the application of foreign calculation standards. For the design of pressure vessels, the American standard ASME VIII, Div 1 (Boiler & Pressure Vessel Code) is worldwide approved. For heat exchangers, the standards of the Tubular Exchanger Manufactures Associations are often used. Since 2005 section UHX of ASME BPVC part VIII-1 is used.

The program packages provides the user with the strength calculation of pressure vessel components, as cylindrical, spherical and, conical shells, heads, plates and flanges according to ASME VIII, Div. 1, as well as the calculation of heat exchanger tube sheets according to UHX or TEMA. A large material data base is included.

It comprises more than 4400 materials of American and German standards, which are specified in detail in the calculation modules. Furthermore, a project sheet is available, in which all items for the calculations can be saved. The documentation ensues with the authoritative equations, so that each calculation can be reconsidered.

The LV-Excel Add-In enables you to transfer values from an EXCEL sheet to an LV module or calculation results from the LV program to an EXCEL sheet. You can use existing EXCEL calculations, while integrating a complete vessel calculation.

The LV package comprises the following modules:

Project sheet AD, UG27 - UG28 - UG29 - UG32 - UG33 - UG34 - UG37 - UHXa - UHXb - UHXc - TEB2 - AFL -AFLT - ATB - material data base

Additional information concerning calculation, tips, hints and notes about deficiencies of the code can be displayed dynamically by pressing the InfoBrowser button.

ASME module package - overview

Module Description  

Project sheet

The Project module summarizes operational and test data, as well as the main parts of a pressure vessel including main geometrical data and used material in one working sheet.

For the final calculation, the specified modules are adjusted and their data are connected to the working sheet. 



(Material data base)

Selection and documentation of materials for the design of pressure vessels

The program determines the allowable material properties dependent on temperature, workpiece geometry, regulation standard and delivery standard. All values are displayed on screen and may be printed, copied into the clipboard, saved as a file (e.g. for further processing in Microsoft WORD) or forwarded to any of our calculation modules like AD 2000 / ASME / TRD / European Standard (EN) calculation program.

The database is bilingual. You can switch from German to English and vice versa.

Ug 99 Test pressure according ASME VIII UG-99

Module UG99 calculates the maximum allowable test pressure acc. ASME VIII-1 UG-99 for a calculation project with multiple chapters. After start, two options can be selected:

  • Test pressure acc. UG-99 and allowable stresses
  • Maximum allowable working pressure (MAWP) acc. UG-99


Ug 27

Cylinders and spheres under internal pressure

Cylindrical and spherical shells under internal overpressure are loaded by tensile stress. In order to avoid failure of the component, the wall must be sufficiently dimensioned.

The UG27 module determines the required wall thickness of cylindrical or spherical shells under internal pressure as well as the allowable overpressure for a given wall thickness. For the calculation of openings, the required wall thickness for a usage factor of 100% is presented.



Ug 28 

Cylinders and spheres under external pressure

Cylindrical or spherical shells under external overpressure can fail by plastic or elastic buckling. Material-temperature-curves for different material groupings are indicated in the ASME-Code, which permit to determine the allowable external overpressure.

The allowable external overpressure for cylindrical and spherical shells can be calculated with the module UG28. The required wall thickness is determined by iteration.



Ug 29

Reinforcement rings at cylindrical shells

It serves for the calculation of the necessary moments of inertia of reinforcements for vessels under external overpressure. The calculation is performed for the following two cases:

  • Consideration of the moments of inertia of wall and reinforcement
  • Consideration of the moment of inertia of the reinforcement, only

With this module, a comparison of the actual and the necessary moment of inertia will be carried out, and a violation of the strength condition will be reported.

The actual moments of inertia of reinforcement rings can automatically be transferred from the BIEG module.



Ug 32 

Dished ends under internal overpressure

For heads or reductions, spherical, elliptical, torispherical or conical geometries can be used. In the ASME code, the deviation from the spherical form is considered by form factors. For cones, the wall thickness of the largest diameter and the cross section of the angle joint must be verified.

The UG32 module determines the required wall thickness of elliptical, torispherical or semispherical heads under internal pressure. For torispherical and semi-ellipsoidal heads, the geometric relations for a spherical torus are included.

For cones, the shell and the knuckle as well as the angle joint can be calculated at the large and small end.



Ug 33

Dished ends under external overpressure

For heads or reductions, spherical, elliptical, torispherical or conical geometries can be used. In the ASME code, the deviation from the spherical form for external overpressure is considered by geometry factors for the evaluation of the material-temperature curves. For cones, the cross section and for effective reinforcements the moment of inertia of the angle joint must be checked.

The UG33 module determines the required wall thickness of elliptical, torispherical or semispherical heads under external overpressure. For torispherical and semi-ellipsoidal heads, the geometric relations for a spherical torus are included. For cones, the cross section and the effective reinforcement of the angle joint at the large and small end can be calculated.



Ug 34

Flat ends or plates with flange moment

The different types of flat ends or plates are considered by factors in the calculation. For bolted plates, the flange moment must also be included.

The UG34 module determines the required wall thickness of flat ends and plates with and without moments. The form factor is determined by specification of the type. The special types are illustrated graphically.



Ug 37

Openings in shells and heads

For openings in pressure vessels, the missing pressure-supporting shell area must be replaced by an extension at the shell or the nozzle or by a reinforcement pad. When the run-out lengths of two adjacent nozzles overlap, the existing area must still be sufficient to replace the opening area.

With the UG37module, inserted and set-on nozzles with and without stiffening ring can be designed. For the calculation of adjacent openings, the values of the single nozzles can be used.




Flanges incl. flange tables acc ANSI / ASME B16.5 (AFLT)

Flange joints must be tight under installation as well as operating conditions. The required bolt forces for this purpose apply a bending moment to the flange. For the different flange types, the existing stresses can be determined by empirical curves using the geometric relations.

With the AFL module , slip-on integral flanges and loose flanges as well as lapped type flanges or flanges without conical hub can be calculated. For the installed condition, a design for the maximum bolt force is possible. All necessary design values for the calculation are listed.




Calculation of flat face flanges with metal-to-metal contact outside the bolt circle according ASME BPVC Appendix Y


Flange class I, A=16 in. = 406.4 mm, B = 10 in. = 254 mm, C = 14 in. = 355.6 mm, G = 11 in. = 279.4 mm, g0 = g1 = 0.375 in. = 9.525 mm, allowable stress Szul = 131 MPa, internal pressure P = 700 psi = 4.826 MPa

Y1/Y2 = (A-B+g0)/(A-C+g0) = (406.4–254+9.525) / (406.4-355.6+9.525) = 162/ 60.3 = 2.7

Required flange thickness:

according APY:  t = 28.58 mm =1.125 in.
according AD-B8:
(with Y1/Y2=2.7)
 t = 45 mm

Spherical dished heads acc. appendix 1 - 6

For dished heads, the maximum stress occurs in the transition region of the spherical shell and in the flange. In appendix 1-6 of the ASME standard, calculation formulas are given for different design types.

The ATB module determines the required wall thickness of spherical dished heads and the required flange thickness for internal and full face gaskets. For dished heads without additional flange rings, clasp bolts are also considered.




Calculation of pipe bends and tees according to ANSI/ASME B31.3

Part B31 of the ASME standard enables the user to design and construct pipework systems safely. Chapter TEB 2 includes pipe bends and tees under influence of external moments.

The calculated stresses are compared with the allowable stress of the chosen material with help of the material data base.




Design of Tubesheets acc. ASME BPVC UHX

The module package UHX is divided into three modules for U-tube, fixed and floating tubesheet heat exchangers acc. section UHX of the ASME BPVC Part VIII-1. The package comprises:

  • UHXa module: U-tubesheets acc. UHX-12
  • UHXb module: Fixed tubesheets acc. UHX-13
  • UHXc module: Floating tubesheets acc. UHX-14
  • The required calculation cases 1-7 for shell or tube side pressure and thermal expansion.
  • Input of the configuration (a-f) for fixed tubesheets and (A-D) for floating tubesheets.
  • Calculation of the operation and test cases
  • Detailed help file in Adobe PDF format including all examples acc. ASME-UHX-20


ASME VIII Div.1 module package incl. material data base

Package price (1 licence) : see price list

For listing of all included modules see price list

US American Standards

Module Description  
ABDR Connection ends of tubes, bends and T-pieces acc. to ANSI B31.3 Try


ANSI Pipe runs, pipe bends, branches according to ASME ANSI B31.3 codes used are ASME/ANSI B36.10 and B36.19 Try


AP14 Integral flat heads with a large, single, circular, centrally located opening acc. ASME VIII-1 Mandatory Appendix 14 Try


AP26 Bellows expansion joints acc. ASME VIII /1 App. 26 (U-shape bellows only) Try


APA Basis for Establishing Allowable Loads for Tube-to-Tubesheet Joints acc. ASME VIII/1 App. A. 

The APA module determines the allowable loads on welded, brazed or frictionally locked tube-to-tubesheet joints. It compares these loads with the allowable loads.



FANY Fatigue analysis for vessel design according to ASME VIII / 2 Try



Seismic loading per Uniform Building Code 1997

The UBC module determines the following forces and moments for columns (as well as vertical storage tanks, chimneys, etc.) caused by earthquakes:

  • Shear load at vessel / construction head
  • Overturning moment at base
  • Moment in arbitrary height X


Price of modules see price list

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