摘要:
The invention provides a composite from which concrete featuring a sufficiently high heat resistance can be produced, as well as a high-safety sealed concrete cask having no opening (shielding defect) to offer high shielding performance that can prevent corrosion of an internal canister and release of radioactive material to the exterior. A concrete cask of the invention includes a cask having a bottom but no lid in itself, and a lid which can open and close off a top opening of the cask. Both the cask and the lid are made of concrete manufactured by using a composite including Portland cement or blended cement containing Portland cement, which is mixed with water in such a manner that the content of calcium hydroxide falls in a range of 15% to 60% by mass after hardening through hydration reaction. Metallic heat-transfer fins are embedded in the cask.
摘要:
A material not releasing gaseous organic substances during use is used as a filter medium and a sealing material for tightly sealing between the medium and a frame. Specifically, a synthetic paraffin not containing an aliphatic hydrocarbon having not more than 19 carbon atoms or less is used as a non-silicone type water repellent contained in a treatment agent for forming fibers into a cloth-like filter medium. A carboxylic acid ester having 400 or more molecular weight is used as a plasticizer and a phenolic compound having 300 or more molecular weight is used as an antioxidant to be added to the treatment agent and the sealing material. This enables that the gaseous organic substances are not present in a clean room, a semiconductor production apparatus or the like. Further, if the filter medium and the sealing material are formed of a material not releasing organic phosphorus compounds and boron compounds in the air, a clean room and a local facility particularly suitable for use in the production of semiconductors are provided.
摘要:
A method of cleaning air, comprising a humidifying step for humidifying the air containing chemical contaminants by a humidifying means and taking a part of the gaseous contaminants in the air into excessive moisture to remove the contaminants from the air and a dehumidifying step for dehumidifying the humidified air by a condensing means and taking the gaseous chemical contaminants remaining, without being removed, in the humidifying step into condensed water for removal, wherein, by using a oblique honeycomb having both front and rear faces and both upper and lower faces disposed in open state, air is led from the front opening part of the oblique honeycomb and water is fed from the upper opening part thereof to one or both of the humidifying and condensing means.
摘要:
A method is provided which facilitates the nesting of multiple concentric pipes within an existing pipe. The front end of the outer pipe (21) of the nested pipes (2) is sealed off and an auxiliary pipe (3) is joined so as to be detachable to the tail end (e) of said outer pipe (21). A thrusting device (4) is mounted onto said auxiliary pipe (3) and the nested pipes (2) are filled with a filler fluid (28). As the thrusting device (4) exerts pressure on the filler fluid (28), the nested pipes (2) are forced into the existing pipe (1).
摘要:
A method is provided which facilitates the nesting of multiple concentric pipes within an existing pipe. The front end of the outer pipe (21) of the nested pipes (2) is sealed off and an auxiliary pipe (3) is joined so as to be detachable to the tail end (e) of said outer pipe (21). A thrusting device (4) is mounted onto said auxiliary pipe (3) and the nested pipes (2) are filled with a filler fluid (28). As the thrusting device (4) exerts pressure on the filler fluid (28), the nested pipes (2) are forced into the existing pipe (1).
摘要:
A process for separation of an asbestos-containing material from a surface to which the asbestos-containing material is adhered and for prevention of floating of dust of the asbestos-containing material in the air, comprising jetting pressurized water from a plurality of nozzles to the surface at a pressure of at least 80 kg/cm .G so as to remove the asbestos-containing material by the energy possessed by the pressurized water.
摘要:
A pipe for a cooling unit comprises an outer pipe (1), and an inner pipe (11) shorter than the outer pipe and located at an evaporating portion in the outer pipe, a circulation gap (13) being defined between the inner wall surface of the outer pipe and the outer wall surface of the inner pipe and leading from one end to the other end of the inner pipe. Also, a cooling unit comprises a plurality of pipes for the cooling unit as noted above, which are arranged as standing side by side vertically or obliquely, and upper and lower header pipes communicating to the upper and lower ends of these pipes, respectively. An individual cooling system comprises a plurality of cooling units as noted above to circulate the refrigerant, whereby a plurality of partitioned spaces are permitted to be cooled down individually and efficiently.