Calculating Torque Friction Between Pipes with Contact Pressure

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sadanand08
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I have two pipes inserted in each other .ID(internal pipe-PVC)=OD(external pipe-plastic)=50mm. They rub each other for 180 degree max in clockwise and anticlockwise direction, also slide by 80mm max (say in helical style). I wish to estimate the frictional torque consumed. I know the external cylinder has force in one direction @1000N acting at its center (at endcap).
 
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What is the contact pressure between the pipes? You can at least get a figure to start with, although I would suggest you start experimenting a bit.
 
ank_gl said:
What is the contact pressure between the pipes? You can at least get a figure to start with, although I would suggest you start experimenting a bit.

How to submit the figure?
 
How to submit the figure? Contact pressure=Force/(diameter*length). Is it the same?