Question

(xy)=50

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 Yoil-7.2 kN/m2 and the unit weight of seawater is w-10.3 kN/m2. The pipe is made of steel (-78.5 kN/m2) with an inner diameter of Dn- (800-t)mm and an outer diameter of Dout (800+t)mm (t2+0.0 oy) [millimetersl- 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

Answer 1

RA te = 0.0194

Vouun consuete- 1to2 to-802 Dyte) blw 60 to 구501。 60 % aaauulong こ 0-60 x0.05 the