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OTHER DATA: Same as Bohai No. 8.WORK AREA: China Sea.BOHAI 12RIG DESIGN: MHI; MD-T-45J, cantileverCONSTRUCTION: MHI Hiroshima Shipyard, 1978.PERFORMANCE: Water depth--56.7 m; Drilling depth--6,000 m.QUARTERS: 80 persons.HULL: 184'' x 157 x 21''.VARIABLE LOAD: 1,200 t (working).HELIPORT: 70'' diameter; S-61.STORAGE: Mud & Cmt Bulk--9,200 cf+5,000sks; Liquid Mud--2,126 bbl; Fuel--2,025 bbl;Water for Drilling--2,767 bbl; Potable Water--1,591 bbl.DRILLING EQUIPMENT: Drawworks--Nat''l 1320UE; Pumps--two Nat''l 12-P-160 Triplex; Prime

Andrew/Whittet-Higgins: One pitfall is not allowing the needed spacing in the assembly housing. If the components are not locked together properly, the machinery can fail prematurely. A second pitfall is assuming that a particular torque measurement for one component is correct for the entire assembly.Jim/Stafford: * Using a set-screw collar on a hardened shaft. The screw does not "set," and holding power is greatly diminished.* Using a set-screw collar on thin-wall tubing, which can permanently distort the tubing.* Specifying too thin a width on a clamp-type collar, leaving used it too weak to resist distortion when the clamp-screw is tightened.* Specifying too thin a clamp-slot on threaded shaft collars where the collar must flex more in order to adequately clamp onto the threaded shaft.