CN111370149A - Outer wall temperature zone control device and method for containment vessel - Google Patents
Outer wall temperature zone control device and method for containment vessel Download PDFInfo
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- CN111370149A CN111370149A CN202010186419.6A CN202010186419A CN111370149A CN 111370149 A CN111370149 A CN 111370149A CN 202010186419 A CN202010186419 A CN 202010186419A CN 111370149 A CN111370149 A CN 111370149A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
- G21C13/024—Supporting constructions for pressure vessels or containment vessels
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/12—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from pressure vessel; from containment vessel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an outer wall temperature partition control device of a containment vessel, which comprises a shell sleeved outside the containment vessel, wherein a temperature control flow channel is formed between the shell and the containment vessel, a plurality of partition mechanisms are arranged in the temperature control flow channel, the partition mechanisms divide the temperature control flow channel into at least two temperature areas, the temperature areas are communicated with a temperature control loop and a liquid discharge pipeline, and the temperature control loop is used for providing temperature control fluid for the temperature areas. When the experiment related to the thermodynamic and hydraulic power in the containment vessel is carried out, the temperature of the fluid in the temperature control flow channel can be changed according to the requirement, so that the temperature in each temperature zone is different, the active control, the adjustable control and the zone control of the temperature of the outer wall surface of the containment vessel are realized, the control precision and the control flexibility of the wall temperature are enhanced, the actual temperature condition is simulated more truly, and the accuracy of the experiment result is greatly improved.
Description
Technical Field
The invention relates to the field of nuclear test control, in particular to an outer wall temperature zone control device and a control method of a containment vessel.
Background
The containment vessel is the last safety barrier of the nuclear reactor system, and has important functions of preventing radioactive substances from leaking outside, protecting personnel outside the field and protecting the environmental safety.
The thermal and hydraulic characteristics in the containment vessel are complex, and under the design basis accident condition, the containment vessel comprises crevasse spraying, steam wall surface condensation, direct steam condensation, spraying, water level change and the like. The containment belongs to large-space equipment, and in order to research the change of the thermal hydraulic characteristics in the space, the thermal boundary conditions of the wall surface need to be reasonably controlled. The boundary conditions of the wall surfaces are different, and the internal thermal process is also different; the wall boundary is unstable, which causes unstable internal thermal process. Therefore, the thermal control of the containment vessel equipment is good and bad, and the data result of the thermal experiment is directly influenced.
Due to the large volume of the containment vessel, the wall temperature varies at different locations. In the traditional temperature control method, the outer side of the containment vessel is wrapped with heat insulation cotton with enough thickness, so that the heat dissipation of the wall surface to the environment is reduced as much as possible, namely the heat insulation boundary condition is approached as much as possible. However, the method can only preserve heat and cannot change temperature, that is, only heat dissipation can be reduced, but the change of the wall surface temperature cannot be changed, and the control requirement of changing the wall surface temperature cannot be met. Secondly, this method is difficult to solve the problem of wall temperature distribution and to achieve temperature zone control.
Disclosure of Invention
The invention aims to provide an outer wall temperature zone control device and a control method of a containment vessel, and aims to solve the problems that experimental data generated by the containment vessel in the prior art cannot realize outer wall temperature zone control is influenced and inaccurate.
In studying the variation of the thermodynamic characteristics in the containment space, there is a need to perform temperature control on the outer wall of the containment vessel to simulate the wall boundary conditions of the containment vessel. The containment vessel is a large space device, and the temperatures of the outer walls at different positions are actually different. In the prior art, in order to control the temperature of the wall surface, the outer side of the containment vessel is wrapped with heat insulation cotton, so that the heat dissipation of the wall surface to the environment is reduced. However, this method can only approach adiabatic boundary conditions, and cannot change the temperature of the wall surface, meet the requirements of wall temperature zone control, or simulate the actual wall surface temperature distribution, thereby causing inaccurate boundary conditions and resulting in a significant difference between the experimental data and the actual data.
In order to solve the problems, the invention provides an outer wall temperature zone control device suitable for a containment vessel according to the characteristic of large volume of the containment vessel. The outer wall of the containment vessel is partitioned, and a plurality of loops are adopted to provide fluids with specified flow and temperature for each temperature area, so that the temperatures in each temperature area of the containment vessel are different, and the temperature partition control of the outer wall of the containment vessel is further realized.
Specifically, the invention is realized by the following technical scheme:
the outer wall temperature zone control device of the containment vessel comprises a shell sleeved outside the containment vessel, a temperature control flow channel is formed between the shell and the containment vessel, a plurality of partition mechanisms are arranged in the temperature control flow channel and divide the temperature control flow channel into at least two temperature zones, the temperature zones are communicated with a temperature control loop and a liquid discharge pipeline, and the temperature control loop is used for providing temperature control fluid for the temperature zones.
The shell is sleeved outside the containment vessel, and the inner wall of the shell and the outer wall of the containment vessel form a temperature control flow channel. Preferably, a heat insulation layer is arranged in the shell and used for reducing heat exchange between the temperature control flow channel and the external environment. The temperature control flow channel is internally provided with a plurality of separating mechanisms which divide the temperature control flow channel into at least two temperature areas, the temperature in each temperature area can be the same or different, and the temperature areas are communicated with a temperature control loop and a liquid discharge pipeline.
When the containment vessel is used, the temperature control loop heats fluid in the containment vessel and controls the flow of the fluid, then the temperature control loop conveys the fluid to the corresponding temperature area, the fluid with the changed temperature enters the temperature area and then gradually fills the temperature area, and meanwhile, the fluid exchanges heat with the outer wall of the containment vessel to change the local temperature of the outer wall.
Through the arrangement, when the experiment related to the thermopower and the hydraulic power in the containment vessel is carried out, the temperature of the fluid in the temperature control flow channel can be changed according to the requirement, so that the temperature in each temperature area is different, the active control, the adjustable control and the partition control of the temperature of the outer wall surface of the containment vessel are realized, the control precision and the control flexibility of the wall temperature are enhanced, the actual temperature condition is more truly simulated, and the accuracy of the experiment result is greatly improved.
The partition mechanism can be arranged in the control flow passage in an undetachable mode to perform specific simulation experiments, and can also be arranged in the control flow passage in a detachable mode to further improve universality. Preferably, the partition mechanism is detachably arranged on the inner wall of the shell and the outer wall of the containment vessel, so that workers can flexibly adjust the structure and the size of each area according to requirements.
As a preferred embodiment of the separation mechanism in the present invention, the separation mechanism comprises a partition board, a hook is arranged on the partition board, and a support, a bottom buckle is hinged on the support, a spring is arranged on the support, the spring is connected with the bottom buckle, and the bottom buckle and the hook can be clamped with each other. Preferably, the spring is an extension spring, and when no external force is applied, the bottom buckle moves towards the bracket under the action of the spring. During the use, the couple of baffle catches on the end and detains, and the end is detained around the hinge end and is rotated, and external force gets rid of the back, and under the effect of spring, the couple drives the end and detains to support direction removal, and the restraint is realized with the shells inner wall butt in the upper end of final baffle, ensures that the baffle is fixed for casing, containment container, and the both sides of baffle are two different temperature areas promptly. Through the quick detach formula structural design, make things convenient for the staff to install fast, dismantle the baffle, simplify the experimentation, improve and separate the effect.
Further, a groove is formed in the inner wall of the shell and used for containing the top end of the partition plate. In order to avoid the top end of the partition plate moving relative to the inner wall of the shell under the impact of liquid, a groove is formed in the inner wall of the shell, and the size of the groove is matched with that of the partition plate. When the clamping device is installed, one end of the partition plate is inserted into the groove, and then the partition plate is rotated by a certain angle, so that the hook of the partition plate hooks the bottom buckle, and the clamping is further completed.
Further, the baffle plate comprises a metal layer, and a heat insulation layer is arranged on the surface of the metal layer. The metal layer plays a structural supporting role, and the heat insulation layer can effectively reduce heat transfer loss of adjacent temperature areas, so that the temperature of the boundary of the temperature areas is basically consistent with the temperature of the center of the temperature areas.
Further, the thermal conductivity of the thermal insulation layer is less than 30 mW/m/K.
Furthermore, air bags are arranged at the upper end and the lower end of the partition board, and vent holes for communicating the inside and the outside of the air bags are formed in the air bags. After the hooks at the lower end and in the groove of the inner wall of the shell body at the upper end of the partition board hook the bottom buckle, the air bag inner space is inflated through the vent holes, the expanded air bag can well fill a working gap between the top end of the partition board and the groove, and the lower end of the partition board and the working gap of the outer wall of the containment vessel, so that on one hand, the fluid convection between adjacent temperature areas can be reduced, on the other hand, the stability of installation of the partition board can be further improved, and the partition board is prevented from shaking or deviating under the liquid impact.
Further, the number of the partition mechanisms is not more than four. The number of the separating mechanisms is two, three or four, and the number of the corresponding temperature zones is two, three or four.
Furthermore, the temperature control loop comprises a liquid inlet pipeline, one end of the liquid inlet pipeline is communicated with the temperature area, the other end of the liquid inlet pipeline is connected with a water feeding pump, and the water feeding pump is connected with a water tank; and the liquid inlet pipeline is provided with a first valve and a heating device. Through the feed pump, water in the water tank gets into each liquid inlet pipe way, and after heating device change and invariable fluid temperature on the liquid inlet pipe way, open first valve and make the fluid get into in the temperature region.
Further, a second valve is arranged on the liquid discharge pipeline. When the temperature of the temperature zone needs to be adjusted rapidly, the second valve can be opened to discharge part of the fluid in the temperature zone, and then the first valve is opened to introduce the fluid with the preset temperature, so that the temperature in the temperature zone can be adjusted to the preset temperature rapidly.
The invention also provides a control method based on any one of the containment vessel outer wall temperature zone control devices, which comprises the following steps:
setting the number of the separating mechanisms and the positions of the separating mechanisms in the temperature control flow channel according to requirements;
determining the number of required temperature zones and further determining the number of the separating mechanisms, determining the sizes of the temperature zones and further determining the installation positions of the separating mechanisms, and then completing the installation of the separating mechanisms to form the specific temperature zones.
Heating the fluid in the temperature control loop to a preset temperature and then keeping the temperature constant;
and after the temperature zone is set, connecting the temperature control loops, starting the water feeding pump, enabling the liquid in the water tank to enter the liquid inlet pipeline of each temperature control loop, starting the heating device, heating the fluid in the liquid inlet pipeline, and keeping the temperature after the fluid is heated to the preset temperature.
Introducing fluid with preset temperature into each temperature zone through a temperature control loop;
and opening the first valve to enable the fluid with the preset temperature to enter the filling temperature areas in the temperature areas.
And adjusting the temperature of the fluid in the temperature control flow channel to control the temperature of the fluid in the temperature area, so as to realize the temperature zone control of the outer wall of the containment vessel.
After the liquid in the temperature area is filled, an experiment is carried out, and in the experiment process, the temperature of the fluid in each temperature control flow channel can be actively adjusted in a partitioning mode, so that the temperature of the fluid in the temperature area is controlled, and the temperature of the outer wall of the containment vessel required actually can be simulated more accurately.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. when the experiment related to the thermodynamic and hydraulic power in the containment vessel is carried out, the temperature of the fluid in the temperature control flow channel can be changed according to the requirement, so that the temperature in each temperature zone generates difference, the active control, the adjustable control and the zone control of the temperature of the outer wall surface of the containment vessel are realized, the control precision and the control flexibility of the wall temperature are enhanced, the actual temperature condition is simulated more truly, and the accuracy of the experiment result is greatly improved;
2. the invention designs a quick-dismantling structure of the separation mechanism, which is convenient for workers to quickly install and dismantle the separation plate, simplifies the experimental process and improves the separation effect;
3. according to the invention, the air bags are arranged at the two ends of the separation mechanism, the air bags are inflated to the inner space of the air bags through the vent holes, and the expanded air bags can well fill the working gap between the top end of the partition plate and the groove and the working gap between the lower end of the partition plate and the outer wall of the containment vessel, so that on one hand, the fluid convection between adjacent temperature areas can be reduced, on the other hand, the installation stability of the partition plate can be further improved, and the partition plate is prevented from shaking or deviating under the liquid impact;
4. the partition plate comprises a metal layer and a heat insulation layer, wherein the metal layer plays a role in structural support, and the heat insulation layer can effectively reduce heat transfer loss of adjacent temperature areas, so that the temperature of the boundary of the temperature areas is basically consistent with the temperature of the center of the temperature areas.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a temperature controlled flow path divided into four temperature zones in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partition mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a separator plate according to an embodiment of the invention;
FIG. 5 is a schematic end view of a spacer in an embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
the temperature control device comprises a shell 1, a temperature control flow channel 2, a separation mechanism 3, a partition plate 31, a metal layer 311, a heat insulation layer 312, a hook 32, an air bag 33, a vent hole 34, a first temperature control loop 4, a second temperature control loop 5, a first valve 6, a heating device 7, a water supply pump 8, a water tank 9, a containment vessel 10, a support 101, a spring 102, a bottom buckle 103, a second valve 11, a first temperature zone 12, a second temperature zone 13, a third temperature zone 14, a fourth temperature zone 15 and a groove 16.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Example 1:
as shown in fig. 1, the outer wall temperature zone control device of the containment vessel comprises a shell 1 sleeved outside a containment vessel 10, a temperature control flow channel 2 is formed between the shell 1 and the containment vessel 10, two separation mechanisms 3 are arranged in the temperature control flow channel 2, the separation mechanisms 3 separate the temperature control flow channel 2 into two temperature zones which are bilaterally symmetrical, the two temperature zones are respectively communicated with a first temperature control loop 4 and a second temperature control loop 5, the two temperature zones are also respectively connected with a drainage pipeline, and the first temperature control loop and the second temperature control loop are used for providing temperature control fluid for the temperature zones;
the first temperature control loop 4 and the second temperature control loop 5 both comprise liquid inlet pipelines, one end of each liquid inlet pipeline is communicated with the temperature area, the other end of each liquid inlet pipeline is connected with a water feeding pump 8, and the water feeding pump 8 is connected with a water tank 9; a first valve 6 and a heating device 7 are arranged on the liquid inlet pipeline; a second valve 11 is arranged on the drainage pipeline.
In some embodiments, an insulating layer is disposed in the housing 1 for reducing heat exchange between the temperature-controlled flow channel and the external environment.
In some embodiments, the number of the partition mechanisms 3 may be two or more, so as to achieve a more optimized partition control effect.
As shown in fig. 2, preferably, the number of the partition mechanisms 3 is four, and the four partition mechanisms 3 partition the temperature-controlled flow channel 2 into a first temperature zone 12, a second temperature zone 13, a third temperature zone 14 and a fourth temperature zone 15, and the temperature in each temperature zone may be the same or different.
According to the technical scheme, when a thermotechnical hydraulic related experiment in the containment vessel is carried out, the temperature of fluid in the temperature control flow channel can be changed according to requirements, so that the temperature in each temperature area is different, the active control, the adjustable control and the partition control of the temperature of the outer wall surface of the containment vessel are realized, the control precision and the control flexibility of the wall temperature are enhanced, the actual temperature condition is simulated more truly, and the accuracy of an experiment result is greatly improved.
Example 2:
on the basis of embodiment 1, as shown in fig. 3 and 4, the partition mechanism 3 includes a partition plate 31, a hook 32 is disposed on the partition plate 31, and further includes a support 101, a bottom buckle 103 is hinged to the support 101, a spring 102 is disposed on the support 101, the spring 102 is connected with the bottom buckle 103, and the bottom buckle 103 and the hook 32 can be clamped with each other; a groove 16 is formed in the inner wall of the shell 1, and the groove 16 is used for accommodating the top end of the partition plate 31; the separator 31 includes a metal layer 311, and a surface of the metal layer 311 is provided with a thermal insulation layer 312.
In some embodiments, the thermal conductivity of the thermal barrier layer 312 is less than 30 mW/m/K.
Through the partition mechanism 3 of quick detach formula structure, make things convenient for the staff to install fast, dismantle the baffle, simplify the experimentation, improve and separate the effect.
As shown in fig. 5, the partition plate 31 is provided at both the upper and lower ends with air bags 33, and the air bags 33 are provided with vent holes 34 for communicating the inside and outside of the air bags 33.
The air bag inner space is inflated through the vent holes, the expanded air bag can well fill a working gap between the top end of the partition plate and the groove, and the working gap between the lower end of the partition plate and the outer wall of the containment vessel, so that on one hand, the convection of fluid between adjacent temperature areas can be reduced, on the other hand, the stability of installation of the partition plate can be further improved, and the partition plate is prevented from shaking or deviating under the liquid impact.
Example 3
The control method of the outer wall temperature zone control device of the containment vessel comprises the following steps:
the number of the separating mechanisms 3 and the positions in the temperature control flow channel 2 are set according to requirements;
the number of required temperature zones and thus the number of partition means 3 are determined, the size of the temperature zones and thus the mounting position of the partition means 3 are determined, and thereafter the mounting of the partition means 3 is completed to form a specific temperature zone.
Heating the fluid in the temperature control loop to a preset temperature and then keeping the temperature constant;
after the temperature zone is set, the temperature control loops are connected, then the water feeding pump 8 is started, the liquid in the water tank 9 enters the liquid inlet pipeline of each temperature control loop, the heating device 7 is started to heat the fluid in the liquid inlet pipeline, and the constant temperature is kept after the fluid is heated to the preset temperature.
Introducing fluid with preset temperature into each temperature zone through a temperature control loop;
the first valve 6 is opened so that the fluid having the predetermined temperature enters each temperature zone to fill the temperature zone.
The temperature of the fluid in the temperature control flow channel is adjusted to control the temperature of the fluid in the temperature zone, thereby realizing the zone control of the temperature of the outer wall of the containment vessel 10.
After the liquid in the temperature area is filled, an experiment is carried out, and in the experiment process, the temperature of the fluid in each temperature control flow channel 2 can be actively adjusted in a partitioning mode, so that the temperature of the fluid in the temperature area is controlled, and the temperature of the outer wall of the containment vessel 10 required actually can be simulated more accurately.
As used herein, "first," "second," "third," "fourth," etc. (e.g., first temperature zone, second temperature zone, third temperature zone, fourth temperature zone, first valve, second valve, etc.) merely distinguish the corresponding components for clarity of description and are not intended to limit any order or to emphasize importance, etc. Further, the term "connected" used herein may be either directly connected or indirectly connected via other components without being particularly described.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The outer wall temperature zone control device of the containment vessel is characterized by comprising a shell (1) sleeved outside the containment vessel (10), a temperature control flow channel (2) is formed between the shell (1) and the containment vessel (10), a plurality of separation mechanisms (3) are arranged in the temperature control flow channel (2), the separation mechanisms (3) separate the temperature control flow channel (2) into at least two temperature zones, the temperature zones are communicated with a temperature control loop and a liquid discharge pipeline, and the temperature control loop is used for providing temperature control fluid for the temperature zones.
2. The outer wall temperature partition control device of the containment vessel according to claim 1, wherein the partition mechanism (3) comprises a partition plate (31), a hook (32) is arranged on the partition plate (31), the containment vessel further comprises a support (101), a bottom buckle (103) is hinged on the support (101), a spring (102) is arranged on the support (101), the spring (102) is connected with the bottom buckle (103), and the bottom buckle (103) and the hook (32) can be clamped with each other.
3. The outer wall temperature zone control device of the containment vessel according to claim 2, characterized in that a groove (16) is provided on the inner wall of the shell (1), and the groove (16) is used for accommodating the top end of the partition plate (31).
4. The outer wall temperature zone control device of the containment vessel as claimed in claim 2 wherein the partition (31) comprises a metal layer (311), and the surface of the metal layer (311) is provided with a thermal insulation layer (312).
5. The external wall temperature zone control device of the containment vessel of claim 4, wherein the thermal conductivity of the insulation layer (312) is less than 30 mW/m/K.
6. The outer wall temperature zone control device of the containment vessel as claimed in claim 2, wherein the partition plate (31) is provided with air bags (33) at the upper end and the lower end, and the air bags (33) are provided with vent holes (34) for communicating the inside and the outside of the air bags (33).
7. The outer wall temperature zone control device of the containment vessel according to any one of claims 1 to 6, characterized in that the number of the partition mechanisms (3) is not more than four.
8. The outer wall temperature zone control device of the containment vessel according to claim 1, wherein the temperature control loop comprises a liquid inlet pipeline, one end of the liquid inlet pipeline is communicated with the temperature zone, the other end of the liquid inlet pipeline is connected with a water feeding pump (8), and the water feeding pump (8) is connected with a water tank (9); the liquid inlet pipeline is provided with a first valve (6) and a heating device (7).
9. The outer wall temperature zone control device of the containment vessel according to claim 1, wherein a second valve (11) is arranged on the liquid discharge pipeline.
10. The control method of the outer wall temperature zone control device of the containment vessel based on any one of claims 1 to 9 is characterized by comprising the following steps:
the number of the separating mechanisms (3) and the positions in the temperature control flow channel (2) are set according to requirements;
heating the fluid in the temperature control loop to a preset temperature and then keeping the temperature constant;
introducing fluid with preset temperature into each temperature zone through a temperature control loop;
and adjusting the temperature of the fluid in the temperature control flow channel to control the temperature of the fluid in the temperature area, so as to realize the temperature zone control of the outer wall of the containment vessel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113431899A (en) * | 2021-07-15 | 2021-09-24 | 江苏金环科技有限公司 | Large-scale jar of body metal insulation construction |
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