Abstract: A heat-resistant assembly to shield boiler tubes which does not entail a thick heat-resistant block. This structure would be interposed between the boiler tubes and the combustion gases. Such a structure would be distinguished by the fact that it comprises heat-resistant block 16, itself composed of curved portion 16a, whose inner surface at one point comes in contact with the aforesaid boiler tube 11, and connecting portions 16b, and the aforesaid boiler tube assembly 12. The interlocking attachment structure which interlockingly secures these two components together in such a way that the block can be mounted or removed comprises recess 17, 58 or 68 and tongue 18, 59 or 69.

Abstract: A device for diagnosing wear on the sliding surface of a piston ring (07a) on a piston (01) which is reciprocating inside a cylinder (02), as applied in diesel engines and compressors, etc. A through-hole (103) is bored in the cylinder wall (02) to extend from the exterior to the interior, and an electric displacement sensor (100) such as, for example, an eddy current type displacement sensor, is inserted into the through-hole inwardly toward the cylinder. The displacement sensor is utilized to measure a difference in an amount of wear between one piston ring (07a) coated with a wear resistant material (102) and another piston ring (07b, 07c, 07d) without wear resistant material coated thereon, and its initial data and data to be collected after use are computed (114), permitting an operator to diagnose the wear on the piston rings based on the change in thickness of the wear resistant material in use.

Abstract: An analysis kit for fuel oil to determine its silica-alumina catalyst component content, comprises a plurality of syringes for sampling fuel oil, sample containers for holding the sampled oil, an organic solvent for dissolving the oil in one of the containers, a filter for the solution of the sample in the organic solvent, a reagent for dissolving a catalyst component in the filtration residue formed by the filter, a measuring cylinder to contain the solution formed by the reagent, purified water for diluting the solution in the cylinder to a predetermined volume, color-producing reagents to be added to the solution adjusted with the purified water, a unit for comparing the color developed by the color-producing reagents with colors of known standards, and a portable box accommodating all of the above-mentioned items and supplies.