Hi,

I am doing analysis for subsea Jumper. I want to workout submerged weight of Jumper.

As a case study I have modelled 10m long pipe 6" sch XXS (pipe density 8027 kg/m3), simply supported. I have worked out weight of pipe & reaction forces on supports in Air. values I get from caesar are matching with hand calculation. (Weight 7.9 kN & support reactions 3.97 kN respectively.)

Now, I have added wave component. Density of sea water considered is 1025 kg/m3.

Can anyone help me with calculation of submerged weight in water for same pipe (10m long 6" Sch XXS)

My way of calculation of submerged weight : Submerged weight will be summation of support end reactions.

After calculating area I am multiplying that figure with desnity. Density calculated as 7002 kg/m3 (ie. 8027-1025). But the answer I get with this approach does not match with hand calculation.

To match with Caesar output I have to reduce the density to 5777 kg/m3.

Now, I am really not sure how to go about this.

can anyone guide me with this?

Thanks in advance.

Regards,
Kaustubh

The submerged weight is the “air weight” minus the weight of the displaced fluid. Start with a one-element cantilever to confirm your work and go from there.

Thanks Dave.

Now I see hand calculations matching with Caesar output with inclusion of "wave" parameter in load case definition.

Regards,
Kaustubh