The latest Caesar II Ver 5.20 has incorporated ISO 14692. May I know what are the major differences & similarities between these two in terms of software calculation.

Is it recommended to still use UKOOA (1994)?

ISO14692 uses ASTM D2992 or equal test method to get strength values (LTHS), just like UKOOA, so this is the same. This instead of the elongation criterium from BS7159.
UKOOA referred to BS7159 for SIF factors, where two types of Tees are given, moulded and laminated. ISO14692 doesn't make this distinction (this was also never completely incorporated in CII for BS7159/UKOOA btw).

I got an email recently from one of the major GRP manufacturers stating that ISO14692 in CII shouldn't be used as there are doubts regarding the stress check formulas in the code. They still prefer to use UKOOA. I don't really understand this as UKOOA and ISO14692 are more or less the same concerning stress check.
They said a new ISO14692 committee is formed to check and discuss the current formulas. I haven't had the opportunity to check this with ISO so can't verify this. If anyone can, please tell me.

To clarify - the stress check doubts are with the formulation established
by the ISO group, not how they are implemented in CAESAR II.
There is an ISO 14692 working group that is reviewing the existing Code pipe (stress) evaluation.

That's indeed what I tried to say Dave. thanks for your clarification.

One more difference between the UKOOA & ISO 14692 is the calculation of SIF for bends and tees. UKOOA crossrefers BS7159 for SIF and the SIF's can be as high as 4 sometimes. ISO 14692 specifies an upper limit of 2.5 and 2.3 on the SIFs of bends and tees.

dears
Is anybody know how stress being checked as per ISO-14692 for sus,ope & occ....
for 31.3
slse
for iso-14692
sus?
ope?
occ?

n then how/when to check idealized eqn i.e axial vs hoop stress?pl guide me on this...

Based on an existing hoop stress, there is an allowed axial stress. This axial stress has two components - 1)axial stress due to the pressure (that produces the hoop stress) and 2) axial stress due to mechanical loads. If hoop stress is within the allowed limit, CAESAR II will compare the axial stress (due to mechanical loads) to a limit equal to [the allowed axial stress for the given hoop stress minus the axial stress due to pressure].
Read ISO 14692 Part 3.

I try to understand the load defintion in ISO 14692 or UKOOA.

Refer to Table 2 - Load Experience by a GRP piping system, are the wave acceleration due to motion during operation (e.g. FPSO) and relative displacement of support due to module to module displacment considered together with weight and pressure in the sustained load case? Hydrotest is also in the Sustained load column but later part stated that hydrotest is analysed as occasional load. This is quite confusing. How does Caesar II approach this?

Only if the sustained load is defined, then only we can add thermal effect for Operating Load Case and add the occassional load for Occassional Load Case.

I also intend to apply different f2 value from ISO 14692 in UKOOA. Should I change the f2 in the Allowable Stress window (this will affect the calculated code stress too) or just compare with a higher allowable load manually.

Can anyone share the typical load cases to be set up for UKOOA or ISO14692?