I activated the Weld reduction factor,WI in configuration file and in input screen.
Arbitarly i set the value WI=0.5 to check the effect on allowble stress, but to my surprise all the results and allowbles stresses were same althought line is operating at 685 degreee Centrigrade.(Creep range).
Where is the impact of changing WI refected in output..(stresses and allowables)

I guess you are talking about WL not WI.

WL doesnt impact on outputs. WL is only used to calculate the minimum wall thickness which is used for internal checking of the user input thickness.


Wc is the factor which will impact on Sus allowables. Go to material data base. their u have to enter Wc based on ur temperature.

Thanks for your response.
By WI i mean to say "Weld Joint Strength Reduction Factor" as per ASME B31.3.
I want to apply "Weld Joint Strength Reduction Factor" to butt or girth welds as required by ASME B31.3 for piping in creep range.

If i apply W in the material data base , i think it will apply to entire material not to the specific weld joints.

I agree that "Weld Joint Strength Reduction Factor" is already used while calculationg thinkness but it does not cover the circumfrentail weld/ butt welds or simply the welds that are required to join pipe to pipe, pipe to elbows... .

Wc is turned on and off in the configuration file. Be sure you have it turned on.
CAESAR II will list W from the material database in the SIF/TEE field (as Wc) but you can change it for those individual tees/joints.

Thanks for your reply,Mr.Dave and Mr.Durga.

I followed your instructions by

1.Entering the value of W in material data base ..(0.5, 0.87,etc. )

2.Turned on Wc check in Configuration file.

3.In input screen introduced butt weld for pipe to pipe welding , activated Wc(The value of 0.87 also appeared there an indication that Wc is activated)

3.Activated Wc in elbows and Tee..

But still i did not see any change in allowable stress for Sustained in the output results...(Sustain Summary Extended)

Hi,

"The value of 0.87 also appeared there an indication that Wc is activated" - I think if you OFF Wc factor in config file also the value will appear, Dont think that if the value is appear it is actvated.

If you input in the material database, CAESAR-II just input those values in the SIF-TEE option Wc in input screen. it doesnt mean it is activated.

I guess not sure...

In the config file setting should be...

Turned on Wc check in Configuration file. means ---

Ignore Wc factor ----- FALSE .

Not True,. check once.

I checked with the small example, CAESAR-II is taking the effect of Wc.

In my Caesar II file no change in allowble stress except it appears in input screen...

Regards

B31.3 has a single value W. CAESAR II breaks that down into two values WL and WC - WL refers to longitudinal and spiral welds and WC refers to circumferential welds that join piping components. WL is mandatory while WC is optional - that's why we have two values in CAESAR II. WL is used in evaluating the wall thickness and WC is used in evaluating sustained (bending) stresses. If you want to see a change in the allowable stress, you should be working with WC. It works for me (see illustration). If it does not work for you please file a ticket with Smart Support.

Mr.Dave & Durga,
It only works only when you manually over write the W value in the cell.
When the value of WI appears by clicking Butt Weld,you have to delete the value of W and then type the W value again, then only the allowable stresses decrease in out-put.

Hi,

I guess, file may be corrupted.

Try with another C-II file. It will work directly without re-entering.

I've experienced the same problems as learner for material A312 TP 316.
I updated the material database for Wc and it was depicted in input spread sheet but allowable were not reduced. It worked after re-entering wc value manually.

Thank Shrikantkm for confirming my findings.

What version of CAESAR II are you using? I just went through this process in CAESAR II 2016 and the program-provided value for Wc properly reduces the allowable stress for sustained loads (when I activate the use of Wc in the configuration file).

Mr.Dave ,
I am using CAESAR II 2014 Ver.7.00.00.2800(Build 140416)

Mine Is CAESAR II 2014 Ver. 7.00.02.1500, built(150430)

Hi Dave

I have two questions, does Wc affect Expansion stresses too or just Sustained?

While Caesar breaks down W into Wl and Wc is there an interpretation or paper providing the background? Can you please share it.

Mr. Dave Diehl explanations would be enough:

http://forums.coade.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=62736

http://forums.coade.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=69841