Internal and external pressures

[DeanE123]

Hello,

Could someone please if possible explain the affects of external pressure (hydrostatic) in combination with internal pressure on a submerged pipelines stresses (hoop, longitudinal, radial) Most equations I have came across only seem to consider 1 or the other and not both simultaneously?

Thanks,

 

[haruspex]

Hello,

Could someone please if possible explain the affects of external pressure (hydrostatic) in combination with internal pressure on a submerged pipelines stresses (hoop, longitudinal, radial) Most equations I have came across only seem to consider 1 or the other and not both simultaneously?

Thanks,

I would think that at any given point what matters is the pressure difference.