JP2006258301A - Thermal insulation method for pipe arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress heat leakage action by heat conduction from a body to be thermally insulated and to exhibit thermal insulation effect of a heat insulation member to a maximum extent. <P>SOLUTION: An outer surface of the heat insulation member B formed so as to be abutted on a linear pipe part of a pipe, i.e., the body to be thermally insulated is covered with a metal outer plate member 10, metal frame members 11, 11 are abutted on a part of an abutment surface to the linear pipe part of the heat insulation member B and bent parts 11a of the both ends are welded/fixed to the metal outer plate member 10. Because of a structure in which the heat insulation member is abutted on the linear pipe part, the thermal insulation effect can be exhibited to a maximum extent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a detachable heat insulating material that is suitable for use in heat insulation mainly for piping, pressure vessels, valves and the like of nuclear power plants.

  Since nuclear power plants are legally required to conduct inspections during the period of use, for example, heat insulation attached to plant piping minimizes the exposure dose during maintenance inspection work with radiation. Therefore, a cylindrical split type heat insulating member that is easy to attach and detach is employed.

  5 to 6 show an example of a conventional cylindrical split type heat insulating member. In the drawings, A is a metal box made of stainless steel plate having a shape in which two or eight hollow cylinders are vertically divided so as to embrace a pipe, and includes an inner plate 1, an outer plate 2, a side plate 3 and an end plate 4. It consists of six plate parts.

  In the metal box A, a heat insulating member B formed by wrapping rock wool 5 with a glass cloth 6 is loaded. Further, on the outer plate 2 of the metal box A, female-type buckles 7a and 7b and male-type buckles 8a and 8b for connecting boxes arranged to face each other in the circumferential direction and the axial direction of the pipe are respectively provided. It is attached. A box support handle 9 is attached to the outer plate 2.

  According to the heat insulating material having the above configuration, it can be quickly and firmly attached to the pipe, and even if any heat insulating material is removed during maintenance inspection of the pipe after installation, the other heat insulating material is not positioned or dropped. It can be done quickly and safely by attaching / detaching the heat insulating material. Therefore, it can greatly improve workability and safety during thermal insulation coating and post-construction maintenance and inspection work on the nuclear power plant piping, such as shortening the time for attaching and detaching the thermal insulation material and reducing the radiation exposure. Can contribute.

  However, in the structure of the heat insulating material, since the inner plate 1 forming the metal box A contacts the outer peripheral surface of the pipe, the metal box acts as a heat conducting member, and a part of the heat on the pipe side is the inner plate. There is a problem in that the heat is dissipated through the path of the 1-side plate 3-end plate 4-outer plate 2, and the heat retention performance is inevitably lowered. Moreover, in the structure of the said heat insulating material, an expensive material cost and production cost are required for the stainless steel metal box which accommodates a heat insulating material.

  The present invention has been made in order to solve the above-described problem, and is capable of quickly performing an attaching / detaching operation to a body to be warmed and capable of maximizing the heat retaining effect on the body to be warmed. The purpose is to provide a cost insulation method for piping.

  In order to achieve the above object, a detachable heat insulating material according to the present invention includes a heat insulating member having a required thickness that is in contact with a body to be heated, and a metal exterior plate member that is stacked to cover the outer surface of the heat insulating member. And a frame member that is applied to a part of the contact surface of the heat insulating member to the heat retaining member and fixed to the metal outer plate member in order to hold the heat insulating member on the metal outer plate member. Is the gist.

  According to the present invention, compared to a removable heat insulating material configured by filling a metal box with a heat insulating material, the heat dissipation effect by heat conduction from the heat insulating material is greatly suppressed, and the heat insulating effect by the heat insulating member is maximized. It is possible to obtain a detachable heat insulating material that can be exerted to the limit and can significantly reduce the expensive steel sheet material to be used, and can reduce the manufacturing cost.

  As a preferred embodiment of the present invention, as shown in FIGS. 1 to 3, the entire outer surface of the heat insulating member B formed into a cylindrical split mold is used to keep the straight pipe portion of the pipe warm. The metal exterior plate member 10 is overlapped, and the heat insulation member B is partially held by the metal exterior plate member 10 by the metal frame members 11 and 11 and the metal presser plate member 12 to constitute the main part of the heat insulating material, and the metal exterior Buckles 7 a, 7 b, 8 a, 8 b for connecting the heat insulating materials butted in the circumferential direction and the axial direction of the straight pipe portion are attached to the plate member 10.

  1 to 3 show an example in which the present invention is implemented in a straight pipe portion of a pipe. In addition, the same code | symbol is attached | subjected to the same or similar member as FIGS. 1 to 3, B is a heat insulating member formed into a cylindrical split type in order to keep the straight pipe portion of the pipe warm. Reference numeral 5 denotes rock wool forming the heat insulating member, and reference numeral 6 denotes a glass cloth enclosing it. The heat insulating member 5 may be a calcium silicate molded body. On the outer surface of the heat insulating member B, a metal exterior plate member 10 of a stainless steel plate (SUS304, thickness 0.8 mm) covering the entire surface is overlaid.

  Moreover, the metal frame member 11 of a stainless steel plate (SUS304, thickness 0.8 to 1.2 mm) is applied to both end portions in the axial direction on the inner side surface of the heat insulating member B, respectively. Each of the bent portions 11a bent 90 degrees sandwiches both side surfaces of the heat insulating member B, is abutted against the metal exterior plate member 10, and is fixedly welded thereto. The metal frame members 11, 11 have a function of fixing the heat insulating member B integrally with the metal exterior plate member 10, and also have a so-called shape holding function for deforming the metal exterior plate member into the shape (R shape) of the metal frame member. Have.

  Further, a metal holding plate member 12 applied to the inner surface of the heat insulating member B is spanned between the metal frame members 11 and 11, and bent portions 12a obtained by bending the both end portions by 90 degrees are provided on the heat insulating member B. While sandwiching both side surfaces, the metal exterior plate member 10 is abutted and fixed by welding. The metal pressing plate member 12 serves to assist the holding function of the heat insulating member B by the metal frame members 11 and 11.

  In this case, if the metal pressing plate member 12 is fixed to the metal frame members 11 and 11 by welding, the integration is further strengthened. In addition, you may connect all the weld parts mentioned above with the volt | bolt nut. Further, the metal frame member is not limited to a metal member, and for example, a ceramic member can be used. In the drawings, 7a and 7b are female buckles attached to the metal exterior plate member 10, 8a and 8b are male buckles, and 9 is a support handle.

  According to the configuration of the removable heat insulating material, the heat insulating member B is in direct contact with the outer peripheral surface of the straight pipe portion of the removable heat insulating material attached to the straight pipe portion of the pipe. In this case, the metal frame members 11 and 11 and the metal presser plate member 12 are also brought into contact with the outer peripheral surface of the straight pipe portion, but the contact surface is slightly smaller than the entire contact surface, and most of the heat insulation is performed. It abuts on the member.

  In addition, most of the surfaces where the heat insulating members abut each other at the end surface in the circumferential direction and the side surface in the axial direction of the straight pipe portion are also abutted by the heat insulating member. Therefore, compared with the conventional heat insulating material, the heat dissipation action by heat conduction from the pipe is greatly suppressed, and the heat insulating effect by the heat insulating member is maximized.

  The metal exterior plate member covering the entire outer surface of the heat insulating member serves as a protective member for the heat insulating material and as a support member for a buckle or the like for connecting the removable heat insulating materials.

  Furthermore, according to the structure of the detachable heat insulating material, it is possible to significantly reduce the stainless steel plate material to be used and to reduce the manufacturing cost as compared with the conventional detachable heat insulating material.

  In FIG. 4, the example which implemented this invention in the elbow part of piping is shown. In FIG. 4, B is a heat insulating member constituting the removable heat insulating material, 10 is a metal exterior plate member, 11 is a metal frame member, and 11a is a bent portion thereof.

  In the detachable heat insulating material, the heat insulating member B is formed in a shape that allows the elbow part to be sandwiched and abutted symmetrically, and the metal exterior plate member 10 that covers the outer surface of the formed heat insulating member B is: For example, it can be easily obtained by bending a plurality of trapezoidal metal plates and joining them together by welding.

  After the metal exterior plate member 10 is superimposed on the outer surface of the heat insulating member B, the metal frame member 11 and the metal presser plate member 12 are provided.

  The detachable heat insulating material configured as described above can be integrated by sandwiching the elbow part from the left and right, and then connecting with a buckle (not shown) attached to the metal exterior plate member 10. Further, the removable heat insulating material for the elbow part can be connected to the removable heat insulating material for the straight pipe part by a buckle.

  In the above embodiment, the outer surface of the heat insulating member B is overlapped so as to cover the metal exterior plate member 10. However, between the heat insulation member B and the metal exterior plate member 10, γ-ray shielding lead It can also be set as the structure which arrange | positions a board. In this case, the lead plate is preferably integrated with the metal exterior plate member 10 by bolting, for example.

  The above is an example in which the present invention is applied to a detachable heat insulating material for piping, but the present invention is not limited thereto, and can be easily applied to a heat insulating material such as a pressure vessel or a valve.

It is an inner surface side perspective view of the removable heat insulating material which implemented this invention in the straight pipe part of piping. It is an outer surface side perspective view of the said detachable heat insulating material. It is the expanded sectional view which cut | disconnected the said removable heat insulating material in the center. It is an inner surface side perspective view of the removable heat insulating material which implemented this invention in the elbow part of piping. It is a perspective view of the conventional removable heat insulating material for piping. It is a partial expanded sectional view of the said detachable heat insulating material.

Explanation of symbols

A Metal box 1 Inner plate 2 Outer plate 3 Side plate 4 End plate B Heat insulation member 5 Rock wool 6 Glass cloth 7a, 7b Female buckle 8a, 8b Male buckle 9 Handle 10 Metal exterior plate member 11 Metal frame member 12 Metal presser Plate member 11a, 12a Bent part

Claims (6)

  A heat insulating member of a required thickness that is in contact with the body to be insulated, a metal exterior plate member that is overlapped to cover the outer surface of the heat insulation member, and heat insulation to hold the heat insulation member on the metal exterior plate member A plurality of detachable heat insulating materials, each of which is applied to a part of a contact surface of the member to the heat insulating body and is fixed to the metal exterior plate member, are covered around the heat insulating material. Insulation method for piping.   The insulated body is a straight pipe part of the pipe, the heat insulating member that is in contact with the straight pipe part is formed in a cylindrical split type, and the frame members are positioned at both end portions in the axial direction of the cylindrical split type heat insulating member, respectively. The method for keeping warm the pipe according to claim 1.   The heat insulation of piping according to claim 2, wherein a holding plate member is spanned between frame members positioned at both end portions in the axial direction of the cylindrical split type heat insulating member, and both ends thereof are fixed to a metal exterior plate member. Method.   The heat-insulating body is the elbow part of the pipe, and the heat insulating member that comes into contact with the elbow part is shaped so that the elbow part can be sandwiched and abutted symmetrically, and each heat insulating member is covered with a metal exterior plate member The heat insulation method for piping according to claim 1, wherein the heat insulating member is held by a metal exterior plate member by a frame member.   The heat insulation method for piping according to any one of claims 1 to 4, wherein a lead plate is interposed between the metal exterior plate member and the heat insulating member.   The heat insulation method for a pipe according to any one of claims 1 to 5, wherein the heat insulating member is formed by wrapping rock wool with glass cloth.

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