Overview of module package AD 2000 / Section S
The AD 2000 bulletins series S apply for the design of pressure vessels under static and fatigue loading. The bulletin AD S1 offers a simplified method for the design of pressurized components under varying pressure. A more detailed fatigue design for varying pressure, temperature differences or additional external forces and moments can be accomplished using AD-S2. The bulletins S3/0 to S3/5 apply for vessel support design. AD S3/6 serves the calculation of local stress in the vessel wall in the region of nozzles by additional external loads.
Additional information and hints for pursuing calculations or deficiencies in the code can be displayed dynamically by using the InfoBrowser.
The calculation documentation is similar to the EN standards.
Interfaces to CAD systems on request.
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
The Project module determines which calculation code is used and
according to which standard the material definition should be done.
Material database WERK
Selection and documentation of materials for the design of pressure vessels
The program determines the permissible strength characteristics depending on temperature, component geometry, the code and delivery standard. All values are displayed, can be printed, copied to the clipboard, stored in a file (e.g. for further processing with MS WORD) or trasnferred to any calculation modules such as AD 2000/EURONORM/ASME/TRD
The material server is bilingual. You can switch from German to English and vice versa.
Pmax / Nzul
PMAX determine the maximum permitted operating and testing pressure and determines the weakest component. Nzul calculates the number of load cycles allowed according to AD S1.
The additional information needed to calculate the max. allowable
operating pressure, test pressure and reference pressure for AD S1 are
implemented. In addition, it is possible to set the boundary conditions
yourself, e.g. for pressure shock, water hammer and explosion
The joint efficiency factors for the load cycle calculation are
proposed by the program and can be adapted to the circumstances at any
S1 – Simplified proof against oscillating stress
Material fatigue must be considered for pulsating loading of steels
with high yield stress. The number of the expected pressure oscillations
must not exceed the allowable number of load cycles.
The S1 module determines the allowable number of stress cycles under
consideration of the pressure, temperature and design factors.
The number of allowable load cycles is determined by the Nzul module.
S2 – Proof against oscillating stress
For temperature variation of the loading (oscillating stress), caused
by internal pressure, temperature differences or additional forces and
moments, a failure by crack initiation must be excluded.
The S2 module provides the following options:
- Calculation of the authoritative equivalent stress range in the
plastically stressed region according to AD – 2000 S2 / section 6
- Calculation of the allowable stress range for a known number of load
cycles on welded and seamless components according to AD – 2000 S2 /
section 7.1 and 7.2
- Calculation of the allowable number of load cycles for a known
cyclic stress range on welded and seamless construction subregions
according to AD – 2000 S2 / section 8.1 and 8.2
S30 – Allowable stresses
The S30 module allows proof of strength for pressure vessels due to
given equivalent stresses according to the AD 2000 Merkblatt S3.0. It
includes a material data base for the determination of the design
strength value and the safety factor. For the application of the limit
analysis or the shakedown analysis, selection criteria are given.
S31 – Vessels on support skirts
The general stability proof can be performed with the module S3.1.
The support skirt connection is possible at the cylinder (slip-on
support or ring support) or in the knuckle area (tori-spherical end or
semi-ellipsoidal end). The support skirt can be made of one or two
opposite segments and can be anchored in the foundation by a simple base
ring or a double ring.
S32 – Horizontal vessels on saddles
The module S3.2 determines the longitudinal, circumferential, and
shear stresses in the critical cross section of horizontal vessels on
saddles. The vessel can be reinforced by internal or external support
rings or built on a support ring with saddles.
The EN 16.14 module (global loads on cylindrical shells) is delivered as supplement.
S33 – Vessels with dished ends on support feet
The general stability proof of vessels with dished ends on support
feet can be performed with the module S3.3. The support feet can be
fixed on the ground with or without reinforcing pads and anchored on
quadratic or circular foundations.
S34 – Vessels with bracket supports
The general stability proof of vessels with bracket supports can be
performed with the module S3.4. Furthermore, the calculation of vessel
walls can generally be used for the assessment of additional forces on
vessel walls without openings. At the bracket support, the support
plate, ligament plate and plate stiffener are calculated. The required
root diameter for the anchor bolts is determined.
Additionally to S3.4 you may want to use the PRAT module
S35 – Vessels with ring support
This AD 200 Merkblatt serves for the calculation of ring girders and
ring supports. The program calculates the allowable stress resultants of
the ring for all relevant load cases.
Using the received result data, a global and local strength proof of
the ring is calculated. A strength proof of the welded seams for the
connection of vessel and ring is carried out.
S36 – Calculation of vessels with nozzles under additional load
The following calculations can be carried out with the program:
- Determination of a fictitious spare strength for additional loads of nozzles
- Check of the conditions under which the stress analysis is
permissible according to the methods in the AD-Merkblatt S3.6, section
The module S3.6 contains an approximation equation for the curves indicated by Bickell, M. B. and C. Ruiz for the stress intensification by pressurizing.
FEM – Calculation of local stresses at the nozzle area by using the Finite Elements Method
Some problems in pressure vessel design cannot or only insufficiently
be solved by using the standard equations of the according code. With
these problematic cases often an FE calculation is the only way to come
to a solution. This calculation is usually quite complex and requires a
certain amount of experience with the interpretation of the results.
We offer an integrated FE calculation for several standard problems like
nozzles with external loads on cylindrical shells or domed heads.
Module package AD 2000 / Section S incl. Material Database
Package price (1 license): See price list
The calculations can also be performed according to the corresponding EURONORM.
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