Stress Analysis

[tobbe]

when stress analyst should analis the piping systemn ?

please refer me to stardard or some handbook?

when we can use CAESAR II ?

tanx

[FATHI]

Formal cases are needed when
1/-When you have rotating equipment such as pumps, turbines, compressors ..for which you have to limit nozzle loads.

2/-When you have nozzle loads on thin vessels
3/-note also that are coolers are also very sensitive to external loads


4/-When you have high or cryogenic temperatures for which there is a lift off on the supports, and where spring supports are needed.

5/-When line deflections have to be checked , and where span tables are not sufficient.
6/-When you have concentrated loads from heavy flanges, valves ..simple pipe span tables are not enough

7/-When you need to know the loads which have to be transmitted to supporting structures

8/-When you need to know the moment at flanges , to check their rating, by reckoning with the generated additional equivalent pressure.

9,10..n/-When you have dynamic loads = seismic, slugs, vibration, modal analysis, discharge loads
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Each company has it own rules to decide when or not to calculate software or by inspection with nomographs or Cantilever methods or by comparison with previous isometrics
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but ultimately all is based on the above points.

Standard EN 134 ?? ( copy should be in this site) for piping , allows you after classification of the line *steam , gas , pressure,..) to go or not for formal calculations.

[tobbe]

dear FATHI,
thank u very mush for good reply.
cheers

[tobbe]

i didnt find EN 134,
do u have this standard?

[FATHI]

Start with PED , let me explain,

All is derived from the Pressure European Directive , called PED

The PED gives guidances, but now formula or sketches,...

There is a PED for vessels and Piping

By classifying according to PED , you will see if you have to calculate with software such as Caesar , you will determine also the extend and amount of inspection and documentation, etc...

The PED is in the web !! for free

tobbe and others,
sorry for the confusion , By 134??? I mean the european piping code , e.g. EN 13480, this contains 5 volumes , the first is general and gives guidance for classification as stated in PED, the 3d is for design,the last ones are for fabrication and inspection testing..all is a bit similar to B31.3 but without ASTM materials...etc

At the end of each volume , you have appendix Z , which tells how to stay in conformity with the PED

[FATHI]

by the way the EN's for piping are here in this site =

[link Point to another website Only the registered members can access]

[tobbe]

tank u very much dear FATHI,
cheers