Dear All,
I am doing analysis for GRP piping in CAESAR II 5.1 using UKOOA.
Vendor has provided us with
Axial, tangential strength & modulus-
Shear modulus-
Ea/Etg * Poison ratio -
Density-
expansion coee.-
& laminate type-

He has used German std. for design.
The LTHS value & R values are not provided. & even he is not going to provide also.
In such case, what values has to be taken for LTHS & r??
Please kindly help me in this regard.
From where can I get these values??

hey, not a single answer??!!!!!!!!!
Please help me out.

Please be patient. Answer is on the way. You can also use the search function, as I have answered a lot of similar questions.

You can determine the strength of the GRP pipe in different ways. One of the methods is a combined pressure + bending/torsion test, according to UKOOA and ISO14692 theories (based on ASTM D2992 if I'm correct).
A second method is to test the strengths seperately. That is most probably what your vendor has done. You can't translate these values into an LTHS & r value.
You better use BS7159 in CAESAR II as the strength according to that code is based on maximum strain of the laminate.

Thanks for your valuable answer.
I shall follow the same.
But what if I use the the LTHS value for GRP pipe from other similar vendor.

As well, as per BS7159, its applicable for pipes with internal pressure of up to 10 bar in case of pipes up to 600 mm internal diameter or up to 6 bar in case of pipes having internal diameters greater than 600 mm & most of our pipes are crossing 10 bar pressure

I wouldn't really mind the pressure and diameter limitations of BS7159. I have no bad experience using that code above 10 bar. You must always be cautious though of you reach the thin/thick walled pipe border. But that's for all piping.

I wouldn't use values from another vendor. Characteristics of the pipe are based on the base materials used and the winding angle (mainly, also other issues have an effect on the properties). Also most vendors have their own definitions for the different characteristics. Some already have an extra safety factor, some don't, some give the actual poisson ratio, some give the poisson ratio * Eh/Ea as needed for CAESAR II. You must have good knowledge about the material and production methods if you want to copy material properties between vendors, even between different series from the same vendor.

In my opinion, if something is not coming in scope of code, then it should not be used.
I shall try to find out something more about the material & manufacturing method.
Our client has a factor of safety 6
Once again thank you very much for your suggestions.
Now I can proceed in some firm direction

The problem with GRP is that the codes still don't cover all practical situations. You need to find your way through and in-between the codes for this material.
There are different factors of safety in GRP. Strength is mostly determined using a short term leakage/burst test. There is a safety factor to set this to a long term stress allowable (that is most probably the factor 6). This factor can get as high as 10. Than there is a standard safety factor of about 1.5 - 2.0 in the code for the pipe stress analysis allowables.

Dear All,

Why dont anyone prefers ASME B31.3 for non-metallic stress analysis instead of ISO 14692 / BS 7159 / UKOOA?

For your last question, see your own seperate topic:
http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=48541

Thanks Corne...............