Dear Friends.

I have one stress system of Pump to Cooling Tower combinations of FRP material & Metallic Piping.
Use - CAESAR 5.2 Ver

Line size - 16" - Connected to Cooling Tower,(FRP)
Line Size - 10" - Connected to Pump (Metallic)
Design Temp - 60 Degree C
Ope Temp = 5 Degree C
Settlement = 35mm in Design Case D3
Ambient Temp = 36 Degree C

Connection with Cooling Tower is FRP material with route piping of approx 1.5m, than connected with Metallic Piping by Flg of FRP & Flg of Metallic.

1) Allowable are ZERO or Blank?

While Input in CAESAR,start from FRP Piping, Stress Allowable(SC,SH1,SH2,SH3,_______SH9),Elastic Modulus EH1,EH2,EH3 are totally Blank - Input Material Sr no -20.(FRP)

1) Are these ZERO or some values insider CAESAR Database
2) Whether we need to input manually?if YES than from where I can find all these values?
3)Any Flange Leakage Check is required for FRP Flange?

2) Instead of EC like Metallic Piping, in FRP CAESAR spreadsheet shows - Elastic Modulus / Axial ---
what does it mean?

3) Also, instead of Poisson Ratio for Metallic Piping, CAESAR spreadsheet shows Ea/Eh * Vh/a for FRP Piping.

What does it mean? Is this works same Poisson Ratio = Stress / strain. in FRP calculation.

4) As due to 35mm settlement case & Lower allowable for Cooling Tower,stiff route of Design layout, Expansion Joints also used at Pump Nozzles,

As i read one of paper of Expansion Jt, for Lower temp (Cold Temp) Expansion jts are not preferable,but to qualify Pump Loads as per Allowable,this is what we are predicting currently.
Any other options?

I await valuable ideas for our queries.

Thanks
SND

Hi SND,

The FRP is a special material: it have different behavior comparing to classic CS pipe it called anisotropic material it mean that a body whose properties vary with the direction.

That's why you have to enter the longitudinal Modulus and the axial Moduls and that's why you can't consider the classic Poisson ratio and it's replaced by n h/a

For mechanical properties, you should ask the manufacturer because each manufacturer have his own fabrication properties (it depend on the step of the winding and the size of the core)

For the pump try to use a spring support

Regards

Dear Friends,

Thanks Abdelkader,

Await more detail reply.


Thanks

Regards
SND

Dear Experts, Richard

Request to guide.


Regards
SND

Hi,

For FRP pipe you need to contact vendors (NOV ect) for data....they would typically provide UKOOA data which you can use with the UKOOA code.

The allowables are based on a envelope in the hoop stress and axial stress space. The total axial stress and the total hoop stress should lie within the envelope. See the CAESAR quick reference guide -Chap 4 Code Stresses-UKOOA code for a formula for allowable.

σab(f2/r) + PDm / 4t < f1f2LTHS / 2.0

σab (axial stress due to mechanical) comes from Caesar. PDm / 4t is the axial stress due to hoop. f2 is the factor that decides whether you are SUS/OCC/OPE.

Elastic Modulus / Axial again comes from vendor data spec sheets.. for eg goto NOV website and check out the product data sheet for any GRE piping (Bondstrand 2400). It is the elastic modulus in the axial direction.

Ea/Eh * Vh/a is the same as Va/h is poisson ratio in axial direction due to hoop strain. It is again got from vendor data

hope this helps

nvk

can anyone suggest best book for mathematical validation of Caesar ii results
for 2 axis system , results approximately match but when third axis involved , the results dont match with caesar report.

I suggest you open a Support Request on eCustomer, and send in your job file along with your verification. We'll take a look and determine why things don't match (which they should).