Abstract: A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger reciprocatingly moved in the pump cylinder. The plunger is provided with a clearance formed between the outer circumferential surface of a lower end portion thereof and the inner circumferential surface of the pump cylinder. The pressure oil supplied from the hydraulic unit is ejected from the clearance along the inner surface of the pump cylinder into a cylinder chamber.

Abstract: A feed water supply pump and a second control valve are provided in a water supply line system and a first control valve is provided at a second steam line. Further, a third control valve is provided at a hot water supply line. In this manner, the terminal temperature difference between the circulating water and the exhaust gas at the inlet and outlet of a preheating portion of an exhaust gas economizer are so controlled as to become equal. In addition, steam discharged from an exhaust outlet of a multi-pressure steam turbine is turned to water by means of a condenser and then, the condensed water is returned to a drain tank while withdrawing and collecting heat energy respectively in a lubricating oil cooler, a fresh water cooler and an air cooler of an internal combustion engine.

Abstract: In a propeller for use in a ship of the type comprising 4 or more even number blades, at least one of two adjacent blades is inclined forwardly or rearwardly or one inclined forwardly and the other rearwardly so as to make different the rake angles of the two blades. The pitch angle of the rearwardly inclined blade is made larger than that of the forwardly inclined blade. With this construction the mutual interference between adjacent blades is efficiently utilized to prevent decrease in the efficiency even when operating conditions and the diameter of the propeller vary.

Abstract: A lubricating oil for diesel engines is disclosed. This oil is based on a mixture of lubricating mineral base oil and a highly aromatic light base oil, and is highly effective in reducing the wear of the diesel engine designed to run with heavy fuels having high carbon to hydrogen ratios. The oil is also advantageous in that it does not clog the lubricant filter.

Abstract: An apparatus for protecting a marine riser extending downwardly from a platform of an offshore station above a sea level toward a sea bottom. A tubular protector is removably mounted on the underside of the platform in surrounding relation to the marine riser in the vicinity of the sea level. According to another embodiment, a tubular protector has an upper portion in the shape of a truncated cone for contact with ice floes and a lower portion shaped as a grid-like truncated cone flaring downwardly for diverting ice floes away from the tubular protector.

Abstract: An object moves along a predetermined route adjacent a pair of inductive radio lines crossed at two predetermined intervals P.sub.1 and P.sub.2. A sensing device on the object senses the intervals and enables generation of an object position signal having a first code value when the interval P.sub.1 is sensed and a second code value when the interval P.sub.2 is sensed.

Abstract: A hot-water storage type power generating unit includes a first tank coupled to a power generating system having a generator, a hot water producting unit for heating medium-temperature water from the first tank with exhaust heat from external equipment to produce high-temperature water, and a second tank for storing the high-temperature water from the hot water producing unit. The high-temperature water is supplied from the second tank to the power generating system for generating electric power to meet peak load demands. The power generating system includes a rotary separator turbine rotatable by the high-temperature water from the second tank for separating steam from the high-temperature water, and a steam turbine rotatable by the steam from the rotary separator turbine, the generator being operatively coupled with the steam turbine for being rotated thereby.

Abstract: An amphibian vehicle having a vehicle body, and at least a pair of floaters attached to the vehicle body, each of which floaters consists of a cylindrical body having a buoyancy, and a helical blade fixed to the outer circumferential surface of the cylindrical body. This amphibian vehicle is formed such that the water line of the amphibian vehicle at a front end surface of each of the floaters is not higher than the center line thereof, with the water line of said amphibian vehicle at a rear end surface of each of the floaters not higher than a level which is higher than the center line of each of the floaters by 30% of the diameter thereof.

Abstract: For saving the heat energy required for alcohol production, processes are provided for subjecting rootstocks (Rhizomes) to enzymatic hydrolysis without conventional cooking with steam in order to obtain a high concentration saccharified material which is then subjected to alcohol fermentation.The first process comprises dipping raw rootstocks in a dilute acid for the purpose of sterilization, then crushing the sterilized rootstocks, macerating the crushed rootstocks, dextrinizing the macerated material by the action of bacterial .alpha.-amylase and adding to the dextrinized material glucoamylase and yeast for alcohol fermentation to effect saccharification thereof and subsequent alcohol fermentation.The second process comprises sterilizing rootstocks with a dilute acid and then crushing it, followed by adding blended maceration enzymes to effect maceration amd saccharification with subsequent alcohol fermentation by yeast.

Abstract: A floating-type offshore structure, of which the main body comprises a lower hull and plurality of struts mounted on the struts and supporting a platform above the sea level and is moored through mooring wire ropes or chains at a predetermined offshore location, and which is adapted for use under both of an ice-covered and an iceless conditions of the sea by adjusting the amount of ballast water contained in a ballast tank or tanks formed in the lower hull and/or the struts and adapted for causing ice floes to undergo downward flexural failure on account of bending stresses when they move into the sea water along the ice contacting face of the strut which is inclined inwardly toward below.

Abstract: A method for de-ashing crushed coal and transporting it in the form of pellets, said method comprising the following steps:A. the step of mixing pulverized coal with a binder to cover the surfaces of coal particles with the binder;B. the step of adding water to the pulverized coal;C. the step of stirring the slurry to disperse ash particles in the pulverized coal into water and to agglomerate coal particles in the pulverized coal by tumbling, whereby forming pelletized coal; andD. the step of separating the pelletized coal from the ash particles, and transporting the pelletized coal.The above basic four steps may be combined with the following steps depending on the state and particle size of raw coal:E. the step of crushing raw coal and separating it into high-ash coal and purified crushed coal, and further pulverizing the purified crushed coal and supplying the resulting powder to the above step A; andF.

Abstract: A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger reciprocatingly moved in the pump cylinder. The plunger is provided with a clearance formed between the outer circumferential surface of a lower end portion thereof and the inner circumferential surface of the pump cylinder. The pressure oil supplied from the hydraulic unit is ejected from the clearance along the inner surface of the pump cylinder into a cylinder chamber.

Abstract: A method of assembling or testing a large-load, marine working platform structure, comprising the steps of laying sand on the bottom surface of a dock, and placing on the layer of sand spud cans attached to the lower ends of support frames of the working platform structure so as to scatter a load applied to the dock bed.

Abstract: Disclosed is a method for the production of coal pellets for the penetration of finely pulverized coal particles suitable for combustion in a coal burner, which comprises the steps of milling raw coal, preparing a coal particle mixture comprising coarser particles and finer particles of the milled raw coal, and adding a binder to the coal particle mixture to produce coal pellets having the coarser coal particles as nuclei and the finer coal particles attached around the nuclei; the coal pellets so-obtained may be pulverized to provide finely divided coal particles.

Abstract: A vertically movable, offshore working platform structure is disclosed, which includes a working platform vertically movably mounted on parallel arranged support frames individually comprising a plurality of parallel disposed vertically elongate cords connected altogether to a support frame assemblage by horizontal members and diagonal members having their ends secured to the cords at panel point portions of the cords, and which also includes guides for the vertical movement thereof which individually have a length at least great enough to extend between two longitudinally adjacent panel point portions of respective cords.

Abstract: The disclosed method for increasing the maneuverability of a ship in ice-covered waters is comprised of bringing generally vertical ice-crushing surfaces on one side of a ship into contact with an ice covering in order to create an imbalance of forces between that side of the ship and the ice covering in comparison with the forces between the other side of the ship and the ice covering in order to assist in turning the ship. The generally vertical ice-crushing surfaces are positioned on both a starboard and port side of the hull of the ship in such a manner that they remain out of contact with the ice covering normal straight forward travel. A particular positioning mechanism is utilized in order to bring a generally vertically oriented ice-crushing wall portion into contact with the ice covering.

Abstract: Disclosed is a semi-submerged ship comprising at least two lower hulls always located below the surface of water and arranged substantially in parallel to each other with respect to the direction of advance, struts mounted substantially vertically on the upper portion of each of all or at least two of the lower hulls along almost the entire length thereof and an upper hull supported by these struts and always located above the surface of water. In this semi-submerged ship, at least one opening is formed on each strut wherein the height of the opening is less than the height of the strut and a water-tight seal is formed between this opening and the interior of the strut. This ship is arranged so that the draft line of the ship is located on the openings of the struts while the ship is stopped. This semi-submerged ship is effectively used as a passenger ship, a cargo ship, a floating factory ship or the like and is especially suitable for stevedoring while stopping the ship in the wavy sea.

Abstract: An oscillator actuated hydraulic impulse of the type including a spool valve actuated by an alternating signal from an oscillator to switch the hydraulic pressure in a double acting cylinder in order to cause reciprocating motion of a piston which strikes a boring tool. The hydraulic impulse device further includes a means for controlling the transition from the impulse stroke to the return stroke of the piston. In some embodiments, the hydraulic impulse device may further include a means for varying the duration of the impulse stroke and the return stroke of the piston.