ALVA Engineering has developed a computerized
comprehensive detailed engineering analysis and design
procedure named ALVA-30-5.2/IBMF, that can be used in the
case of cylindrical shells loaded with high pressure,
temperature and external or internal mechanical loading, and in
reference to the design options as shown in this site page
The work is applicable for the industrial structures and items, and since this work is a
result of a fluent mathematical procedure it has nothing to do with any design code. A
design code specifies only that a certain problem can also be solved by detailed analysis.
Evidently in performing a detailed analysis we are not using any code information,
eventually we can show that our procedure ends up with the same result or equation
mentioned in a design code which doesn't mean, if it is necessary to mention, that the
detailed analysis procedure is done in accordance with a design code.
Except the information obtained from the experimental stress analysis, a reference
design code is a consequence of the detailed engineering analysis procedures.
Computer Program Description regarding the above work, now completely attached here
in the Web site pages "services" Page 1,2,3, "services2" Page 4,5,6 and "services3"
Page 7,8 contain comments and a reach engineering analysis procedure description. At
these, a few additional program output pages are also attached to this site. The basic
analysis procedure that we have to follow, namely: Sustained and Thermal Loading
Analysis, Combination of the Sustained and Thermal Loading to satisfy certain
requirements for the five possible fatigue equations, and ending with the Fatigue Analysis
are fully discussed and mathematically developed in the program project version (P).
The purpose of the attached site work is mainly to show the engineering level which a
work can be commented and done at, and also to mention that it is ready to be involved in
the new or old projects engineering problems. The shell-lug itself interface item, the
attachment in our work, cannot be, from the engineering analysis point of view, any
geometrical configuration we can think of. There are also analysis procedures for the
rectangular and square attachments. It is clear that the weld, the attachment and the lug
itself is a block not examined by the present program. I would say that this work is
addressed to those interested to know more about cylindrical shell engineering analysis
ALVA-30-5.2 computer program is a powerful detailed engineering analysis and design
procedure for cylindrical shells having the mechanical loading conditions as shown in
the Design Options 1 to 4 (Web site page "services4"), and a parabolic temperature
gradient condition. Information about the stress distribution within the analyzed shell
characteristic points, due to the loading conditions, are given in detail (Web site page
"services7") and therefor a rapid answer for a modified input can be obtained if the fatigue
condition is not satisfied or for any other reason you could consider.
Under normal and convenient circumstances, ALVA Engineering can take subjects from
the attached Professional Profile to be commented or developed as a detailed
August 9, 2011 (ALVA-34T/ C++, services8 Page 21g1 to 21g95), .
September 13, 2011 (ALVA-34T C++, REVISIN 5.6, services8 Page 21h1 to 21h77)
ALVA Engineering, or
Comprehensive Engineering Analysis
Piping with integral round attachments on vertical tangents, and constructed to fulfill
specific requirements, such as those specified by the ASME Section III Subsection NB
Code, needs the typical engineering procedure and results provided by the ALVA-30
design OPTION 2 computer program, to assure the engineering compatibility
design-nuclear power plant structures design requirements. The program can be applied
immediately after the load at the pipe lug-attachment level is known from the piping
flexibility analysis, and the certainty that the General Primary Membrane Stress in the shell
(pipe) zone where the strain due to the lug load is active, does not exceed the prescribed
allowable stress intensity value. The program takes the pipe lug zone analysis from the
beginning, and the situation is such that the piping examined by the ASME Section III
Subsection NB simplified analysis (equations 9, 10, etc.) procedure, can be rejected.
Since some input data for this program design OPTION 2 piping version are taken from
the piping flexibility analysis results, and with a few exceptions the input data are
common, the present program's engineering procedure concept can be embedded into
piping flexibility analysis program. See the Web site pages "services9, 10 and 11" for
Experimental stress analysis, and a simplified analysis is very much a consequence of
the detailed analysis with some shortcuts and assumptions, probable given a bulk
stress, therefor a stress without being in three orthogonal planes, as is required to
perform a detailed analysis. The time for the simplified analysis is gone.