Adrillstring is composed of 9000 ft of 5-in. 19.5-lbm/ft drillpipe and 1000 ft of drill collars having a 8.0-in. od, 3.0-in. id. compute: a) capacity of the drillpipe in barrels. b) capacity of the drill collars in barrels. c) number of pump cycles required to pump surface mud to the bit. the pump is a duplex double acting pump with 6-in. liners, 2.5-in. rods, 16-in. strokes, and operates at a volumetric efficiency of 85%. d) displacement of the drillpipe in bbl/ft. e) displacement of the drill collars in bbl/ft. the od of the collars is 8.0-in

Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w