Sealing Pipe Penetrations

Dear all,

I'm analyzing a pipe line with needs to pass through a dyke wall. So, it's necessary some sealant to avoid flood in case of leakage of tanks. Project Manager suggest us to use a member seal to this job (follow some examples). The question is: how to model these kind of seal? Someone use this before and can explain me more about allowable displacements and allowable forces?

I tried to simulate this as a set of restraints X, Y, Z with stiffness using 0.6 as friction factor (rubber x steel).

If some have another way to do this job, please help.

Thanks in advance.

Link-Seal

These seals will take pretty limited loads, best to guide and support pipe on each side, and not have piping layout trying to drive the pipe axially through the seal. 0.6 friction factor is not accurate as it is not just pipe weight but the pressure forces of the seal acting on the pipe that will produce resistance to movement. If all else fails talk to Vendor.

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You might consider a Bestobell type seal. They are fireproof and provided movement isn't too significant, present practically no resistance.

dclarkfive, you are right. I can't define just a friction factor once the main restraint is caused by the pressure of rubber tighted properly in the pipe and concrete wall. Vendor usually don't know this kind of doubt. Basically the answers are the same: we don't have any tests for this analysis (like stiffness, friction, etc.). I think Link-seal have restraint in all directions with a almost rigid flexibility due the force against pipe and wall, but for lateral and vertical movements have no displacements and in axial direction have a little displacement. And don't have rotational restraints.

In a conservative case, can I simulate the seal as a anchor?

Thanks again,

Miyamoto

I think you could model as an anchor, IF...

- Piping is well supported guided on each side of the dyke,
- Piping layout is fairly flexible on each side, so that large anchor forces do not develop at the seal.

Knowing your pipe size, temperature, and a layout sketch would help.

It's a FRP pipeline. Follow file for more explanations.

Pump nozzles:
- 500 x 5450
- 1800 x 6000
- 1150 x 6550

Wall Penetration Begin x End:
- 210 x 220
- 1510 x 1520
- 860 x 870

I think this seal can be modeled as a FLEX ANCHOR, but I don't know what values of stiffness I can use.

I imagine something about 1e+06 kgf/cm. It's almost rigid but mainly allow a short axial displacement.

Regards,

Miyamoto