Question

2. An underwater pipeline is designed to tranfer oil between the oil rig and the storage facility. The unit weight of oil is given as o-7.2 kN/m2 and the unit weight of seawater is /w-10.3 kN/m3. The pipe is made of steel (st 78.5 KN/m2) with an inner diameter of Dn- (800-t)mm and an outer diameter of Dour (800+t)mm (t2+0.01 y) [millimeters)-SEE END OF PAPER). Check the stability of the pipeline against uplift and calculate the amount of ballast needed for the following cases a. A uniform concrete coating of thickness te is to be applied to the entire pipe; calculate tc b. Concrete weight blocks are to be installed with spacings. If the crane available has a lifting capacity of 30 tonnes, calculate the spacing for the blocks Seawater Oil Seabed
x=1 y=2

Answer 1

2 40.01x 12 2.02mm MYA ond the waPu vlume.deuae Hence Pip is Mot slable S ㄷ 280rg w乞 2e.ors kiemeTA