CN107677554A - It is inside and outside to pull-type Nozzle Zone of Vessels pressure testing device - Google Patents
It is inside and outside to pull-type Nozzle Zone of Vessels pressure testing device Download PDFInfo
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- CN107677554A CN107677554A CN201710953592.2A CN201710953592A CN107677554A CN 107677554 A CN107677554 A CN 107677554A CN 201710953592 A CN201710953592 A CN 201710953592A CN 107677554 A CN107677554 A CN 107677554A
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 88
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 210000004907 gland Anatomy 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 10
- 238000010276 construction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
本发明公开了一种内外对拉式压力容器接管试压装置，包括密封连接在接管法兰上法兰盖和位于压力容器内部的接管密封装置，接管密封装置包括与接管同轴设置的密封管，在密封管内设有与法兰盖平行的密封板，在密封管远离压力容器的一端设有对拉盖板，对拉盖板和法兰盖采用对拉螺杆连接，密封板套装在对拉螺杆上，二者之间设有密封结构，在密封管靠近压力容器的一端固接有与压力容器内表面形状吻合的曲面环板，曲面环板压在压力容器的内表面上，在曲面环板与压力容器的内表面之间设有密封垫圈Ⅱ，在法兰盖上设有试压接管。本发明能够实现复合层压力容器的局部试压，缩短复合层压力容器的改造工期，降低复合层压力容器的改造成本。
The invention discloses an inner and outer pull-type pressure vessel nozzle pressure test device, which comprises a flange cover sealingly connected to the nozzle flange and a nozzle sealing device inside the pressure vessel. The nozzle sealing device includes a sealing tube arranged coaxially with the nozzle , there is a sealing plate parallel to the flange cover in the sealing tube, and a double-pull cover plate is provided at the end of the sealing tube far away from the pressure vessel. On the screw, there is a sealing structure between the two. A curved ring plate matching the shape of the inner surface of the pressure vessel is fixed at the end of the sealing tube close to the pressure vessel. The curved ring plate is pressed on the inner surface of the pressure vessel. A sealing gasket II is provided between the plate and the inner surface of the pressure vessel, and a pressure test connecting pipe is provided on the flange cover. The invention can realize the partial pressure test of the composite layer pressure vessel, shorten the reconstruction period of the composite layer pressure vessel, and reduce the reconstruction cost of the composite layer pressure vessel.
Description
技术领域technical field
本发明涉及一种局部试压装置，特别是一种内外对拉式压力容器接管试压装置。The invention relates to a partial pressure test device, in particular to a pressure test device for connecting pipes of internally and externally pulled pressure vessels.
背景技术Background technique
石油化工生产装置的某些工艺流程在优化或发生改变时，需要对一些压力容器进行局部改造，比如在设备上增加新的接管或其他附件，亦或更改设备原有接管的口径。TSG21-2016《固定式压力容器安全技术监察规程》第5.2.5条改造和重大维修的耐压试验中规定：用焊接(粘接)方法更换或者新增主要受压元件的，在改造和重大修理施工过程中应当进行耐压试验。When some processes of petrochemical production plants are optimized or changed, some pressure vessels need to be partially modified, such as adding new nozzles or other accessories to the equipment, or changing the diameter of the original nozzles of the equipment. Article 5.2.5 of the TSG21-2016 "Safety Technical Supervision Regulations for Stationary Pressure Vessels" stipulates in Article 5.2.5 of the pressure test for modification and major maintenance: if the main pressure components are replaced or newly added by welding (bonding), in the modification and major maintenance The pressure test shall be carried out during the repair construction.
装置中维修改造的设备均为已经投用的设备，一般在装置停工检修期间完成施工内容。由于设备已投用，设备的保温、管道、内件等均已完成，对设备整体试压最大的困难就是设备管口法兰拆除并安装盲板，其次就是设备的整体上水及排水工作量较大，上述两点除了对工期有很大的影响之外，消耗的人力、机具以及材料也是巨大的。由于局部改造后，对设备整体强度的影响很小，因此在设备改造处进行水压试验，通过该水压试验来检验接管的强度和严密性是可行的。The equipments to be repaired and rebuilt in the plant are already put into use, and the construction content is usually completed during the shutdown period of the plant. Since the equipment has been put into use, and the insulation, piping, and internal parts of the equipment have been completed, the biggest difficulty in the overall pressure test of the equipment is the removal of the nozzle flange of the equipment and the installation of the blind plate, followed by the overall water supply and drainage of the equipment. The above two points not only have a great impact on the construction period, but also consume a lot of manpower, equipment and materials. Since the partial modification has little effect on the overall strength of the equipment, it is feasible to conduct a hydrostatic test at the location where the equipment is modified to verify the strength and tightness of the connecting pipe.
单层压力容器用试压盒进行局部压力试验在石油化工施工现场已经得到广泛应用，此处不再做详细介绍。但是试压盒不能用于复合层压力容器，原因在于：在压力容器的复合层上焊接试压盒，会因强度不足，在局部试压时撕裂复合层。The local pressure test of single-layer pressure vessel with pressure test box has been widely used in petrochemical construction sites, and will not be described in detail here. However, the pressure test box cannot be used in composite layer pressure vessels, because the pressure test box is welded on the composite layer of the pressure vessel, and the composite layer will be torn during local pressure testing due to insufficient strength.
目前，设有复合层的压力容器还没有较为完善的局部试压解决方案。At present, there is no relatively complete local pressure test solution for pressure vessels with composite layers.
发明内容Contents of the invention
本发明为解决公知技术中存在的技术问题而提供一种内外对拉式压力容器接管试压装置，该装置能够实现复合层压力容器的局部试压。In order to solve the technical problems in the known technology, the present invention provides an internally and externally pulled type pressure vessel joint pressure test device, which can realize partial pressure test of the composite layer pressure vessel.
本发明为解决公知技术中存在的技术问题所采取的技术方案是：一种内外对拉式压力容器接管试压装置，包括密封连接在接管法兰上法兰盖和位于压力容器内部的接管密封装置，所述接管密封装置包括与接管同轴设置的密封管，所述密封管的直径大于接管的直径，所述密封管的管壁与接管和压力容器的焊缝错开，在所述密封管内设有与所述法兰盖平行的密封板，在所述密封管远离压力容器的一端设有与所述法兰盖平行的对拉盖板，所述对拉盖板和所述法兰盖采用对拉螺杆连接，所述对拉螺杆的一端与所述法兰盖固接，另一端穿出所述对拉盖板，在所述对拉螺杆穿出所述对拉盖板的端部设有锁母，所述密封板套装在所述对拉螺杆上，二者之间设有密封结构，在所述密封管靠近压力容器的一端固接有与压力容器内表面形状吻合的曲面环板，所述曲面环板压在压力容器的内表面上，在所述曲面环板与压力容器的内表面之间设有密封垫圈Ⅱ，在所述法兰盖上设有试压接管。The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: an internal and external pull-type pressure vessel connection pressure test device, including a flange cover sealed on the connection flange and a connection seal located inside the pressure vessel. device, the sealing device for the connecting pipe includes a sealing pipe arranged coaxially with the connecting pipe, the diameter of the sealing pipe is larger than that of the connecting pipe, the pipe wall of the sealing pipe is staggered from the welding seam of the connecting pipe and the pressure vessel, and in the sealing pipe A sealing plate parallel to the flange cover is provided, and a sliding cover plate parallel to the flange cover is provided at the end of the sealing tube away from the pressure vessel, and the sliding cover plate and the flange cover Use the pull screw connection, one end of the pull screw is fixed to the flange cover, the other end passes through the pull cover plate, and the end of the pull screw rod passes through the pull cover plate A lock nut is provided, the sealing plate is set on the pull screw rod, a sealing structure is provided between the two, and a curved surface ring conforming to the shape of the inner surface of the pressure vessel is fixedly connected to the end of the sealing tube close to the pressure vessel. The curved ring plate is pressed against the inner surface of the pressure vessel, a sealing gasket II is provided between the curved ring plate and the inner surface of the pressure vessel, and a pressure test connecting pipe is arranged on the flange cover.
所述密封结构包括与所述密封板固接的填料函，所述填料函设置在所述密封板远离压力容器的一侧，在所述填料函内设有填料，在所述填料函远离所述密封板的一端上固接有压盖。The sealing structure includes a stuffing box fixedly connected to the sealing plate, the stuffing box is arranged on the side of the sealing plate away from the pressure vessel, a packing is arranged in the stuffing box, and the stuffing box is far away from the pressure vessel. A gland is fixedly connected to one end of the sealing plate.
所述填料为石墨绳。The filler is graphite rope.
在所述密封管的侧壁上设有观察操作孔，所述观察操作孔设置在所述密封板远离压力容器的一侧。An observation operation hole is provided on the side wall of the sealing tube, and the observation operation hole is arranged on a side of the sealing plate away from the pressure vessel.
在所述对拉盖板上设有沿周向均布的至少三块定位板，所有所述定位板环绕在所述密封管周围，所述定位板与所述观察操作孔错开布置。At least three positioning plates uniformly distributed along the circumferential direction are arranged on the sliding cover plate, all of the positioning plates surround the sealing tube, and the positioning plates are arranged in a staggered manner from the observation operation hole.
在所述锁母和所述对拉盖板之间设有均力垫板。An equalizing backing plate is provided between the lock nut and the sliding cover plate.
在所述法兰盖与接管法兰之间设有密封垫圈Ⅰ。A sealing gasket I is provided between the flange cover and the connecting flange.
本发明具有的优点和积极效果是：通过在压力容器改造的接管处安装一个内外对拉式的试压装置，通过对该试压装置进行水压试验来检验改造接管的强度以及严密性，性能可靠，使用方便，避免了局部试压装置在压力容器本体上的焊接，解决了复合层压力容器因焊接局部试压盒而撕裂复合层的问题，能够实现复合层压力容器的局部试压，缩短复合层压力容器的改造工期，降低复合层压力容器的改造成本。并且本发明结构简单、便于制作，成本低。The advantages and positive effects of the present invention are: by installing an internal and external pull-type pressure test device at the connection point of the pressure vessel transformation, the strength, tightness and performance of the transformation connection pipe can be inspected by performing a hydraulic test on the pressure test device. Reliable and easy to use, it avoids the welding of the local pressure test device on the pressure vessel body, solves the problem of tearing the composite layer of the composite layer pressure vessel due to the welding of the local pressure test box, and can realize the partial pressure test of the composite layer pressure vessel, Shorten the reconstruction period of the composite layer pressure vessel and reduce the reconstruction cost of the composite layer pressure vessel. Moreover, the invention has simple structure, is convenient to manufacture, and has low cost.
附图说明Description of drawings
图1为本发明的结构示意图；Fig. 1 is a structural representation of the present invention;
图2为本发明应用的结构示意图；Fig. 2 is the structural representation of application of the present invention;
图3为本发明的密封管结构示意图。Fig. 3 is a schematic diagram of the structure of the sealing tube of the present invention.
图中：1、密封垫圈Ⅰ；2、法兰盖；3、试压接管；4、曲面环板；5、密封管；6、密封板；7、对拉盖板；8、压盖；9、均力垫板；10、填料函；11、定位板；12、压力容器；13、密封垫圈Ⅱ；14、对拉螺杆；15、接管；16、观察操作孔；17、石墨绳；18、锁母。In the figure: 1. Sealing gasket Ⅰ; 2. Flange cover; 3. Pressure test connection pipe; 4. Curved surface ring plate; 5. Sealing tube; 6. Sealing plate; 1. Uniform backing plate; 10. Stuffing box; 11. Positioning plate; 12. Pressure vessel; 13. Seal washer II; lock mother.
具体实施方式detailed description
为能进一步了解本发明的发明内容、特点及功效，兹例举以下实施例，并配合附图详细说明如下：In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
请参阅图1～图3，一种内外对拉式压力容器接管试压装置，包括密封连接在接管法兰上法兰盖2和位于压力容器12内部的接管密封装置，所述接管密封装置包括与接管15同轴设置的密封管5，所述密封管5的直径大于接管15的直径，所述密封管5的管壁与接管15和压力容器12的焊缝错开，在所述密封管5内设有与所述法兰盖2平行的密封板6，在所述密封管5远离压力容器12的一端设有与所述法兰盖2平行的对拉盖板7，所述对拉盖板7和所述法兰盖2采用对拉螺杆14连接，所述对拉螺杆14的一端与所述法兰盖2固接，另一端穿出所述对拉盖板7，在所述对拉螺杆14穿出所述对拉盖板7的端部设有锁母18，所述密封板6套装在所述对拉螺杆14上，二者之间设有密封结构，在所述密封管5靠近压力容器12的一端固接有与压力容器12内表面形状吻合的曲面环板4，所述曲面环板4压在压力容器12的内表面上，在所述曲面环板4与压力容器12的内表面之间设有密封垫圈Ⅱ13，在所述法兰盖2上设有试压接管3。Please refer to Figures 1 to 3, a pressure test device for an internally and externally pulled pressure vessel nozzle, including a flange cover 2 sealed on the flange of the nozzle and a nozzle sealing device located inside the pressure vessel 12, the nozzle sealing device includes The sealing pipe 5 coaxially arranged with the connecting pipe 15, the diameter of the sealing pipe 5 is larger than the diameter of the connecting pipe 15, the pipe wall of the sealing pipe 5 is staggered with the welding seam of the connecting pipe 15 and the pressure vessel 12, and the sealing pipe 5 A sealing plate 6 parallel to the flange cover 2 is provided inside, and a sliding cover plate 7 parallel to the flange cover 2 is provided at the end of the sealing tube 5 away from the pressure vessel 12. The plate 7 and the flange cover 2 are connected by a pair of pull screws 14, one end of the pair of pull screws 14 is fixedly connected to the flange cover 2, and the other end passes through the pair of pull cover plates 7. The end of the pull screw 14 passing through the pull cover 7 is provided with a lock nut 18, the sealing plate 6 is sleeved on the pull screw 14, and a sealing structure is arranged between the two, and the sealing tube 5 One end close to the pressure vessel 12 is fixedly connected with a curved ring plate 4 conforming to the shape of the inner surface of the pressure vessel 12, and the curved ring plate 4 is pressed against the inner surface of the pressure vessel 12. A sealing gasket II13 is provided between the inner surfaces of 12, and a pressure test connecting pipe 3 is provided on the flange cover 2.
在本实施例中，所述密封结构包括与所述密封板6固接的填料函10，所述填料函10设置在所述密封板6远离压力容器12的一侧，在所述填料函10内设有填料，在所述填料函10远离所述密封板6的一端上固接有压盖8。在本实施例中，所述填料为石墨绳17。在所述密封管5的侧壁上设有观察操作孔16，所述观察操作孔16设置在所述密封板6远离压力容器12的一侧。通过观察操作孔16可以观察密封管5内的填料函10是否漏水，如若漏水，需要工作人员将工具伸入观察操作孔16拧紧压盖8的锁固螺栓，压实石墨绳17。为了方便对拉盖板7的安装，在所述对拉盖板7上设有沿周向均布的至少三块定位板11，所有所述定位板11环绕在所述密封管5周围，所述定位板5与所述观察操作孔19错开布置。为了使对拉盖板7的受力更加均匀，在所述锁母18和所述对拉盖板7之间设有均力垫板9。在所述法兰盖2与接管法兰之间设有密封垫圈Ⅰ1。In this embodiment, the sealing structure includes a stuffing box 10 fixed to the sealing plate 6, the stuffing box 10 is arranged on the side of the sealing plate 6 away from the pressure vessel 12, and the stuffing box 10 Filling is provided inside, and a gland 8 is fixedly connected to the end of the stuffing box 10 away from the sealing plate 6 . In this embodiment, the filler is graphite rope 17 . An observation operation hole 16 is provided on the side wall of the sealing tube 5 , and the observation operation hole 16 is arranged on a side of the sealing plate 6 away from the pressure vessel 12 . Can observe whether the stuffing box 10 in the sealing pipe 5 is leaking by observing the operation hole 16, if leaking, need the staff to put tool into the observation operation hole 16 and tighten the locking bolt of the gland 8, and compact the graphite rope 17. In order to facilitate the installation of the pull cover plate 7, at least three positioning plates 11 uniformly distributed along the circumferential direction are arranged on the pull cover plate 7, and all the positioning plates 11 surround the sealing tube 5. The board 5 and the observation operation hole 19 are arranged in a staggered manner. In order to make the force on the sliding cover plate 7 more uniform, an equalizing backing plate 9 is provided between the lock nut 18 and the sliding cover plate 7 . A sealing gasket I1 is provided between the flange cover 2 and the connecting flange.
所述法兰盖2与设备改造后的接管法兰型号一致，配套使用。法兰盖2上应至少有两个试压接管3，用于连接试压水管和压力表；所述对拉螺杆14一端带有螺纹，不带螺纹的一端要与法兰盖2焊接成一个整体，焊接时一定要保证对拉螺杆14的垂直度；接管密封装置包括密封管5、曲面环板4、密封垫圈Ⅱ13、密封板6、填料函10、石墨绳17和压盖8，曲面环板4与密封管5焊接，通过密封垫圈Ⅱ13密封压接在压力容器12的内表面上，一定要确保曲面环板4与压力容器12的内表面密封良好。上述接管密封装置在压力容器内部安装时，密封管的管壁一定要避开新增接管的焊缝。The flange cover 2 is consistent with the model of the connecting flange after equipment transformation, and is used as a set. There should be at least two pressure test connecting pipes 3 on the flange cover 2, which are used to connect the pressure test water pipe and the pressure gauge; As a whole, the verticality of the pulling screw 14 must be guaranteed during welding; the connecting pipe sealing device includes a sealing tube 5, a curved ring plate 4, a sealing gasket II 13, a sealing plate 6, a stuffing box 10, a graphite rope 17 and a gland 8, and a curved ring The plate 4 is welded to the sealing tube 5, and is sealed and crimped on the inner surface of the pressure vessel 12 through the sealing gasket II13. It is necessary to ensure that the curved surface ring plate 4 and the inner surface of the pressure vessel 12 are well sealed. When the above-mentioned connecting pipe sealing device is installed inside the pressure vessel, the pipe wall of the sealing pipe must avoid the welding seam of the newly added connecting pipe.
安装时，在压力容器12外部，将焊接在法兰盖2上的对拉螺杆14穿过改造后的接管15，在接管15的法兰上设置密封垫圈Ⅰ1，找正对拉螺杆14，拧紧法兰盖2和接管法兰的连接螺栓，实现法兰盖2和接管法兰的密封连接。在压力容器12的内部，首先将密封垫圈Ⅱ13用胶水粘在压力容器12的内表面上，然后采用倒链将接管密封装置套在对拉螺杆14上，找正，使曲面环板4压紧在密封垫圈Ⅱ13上，最后填塞石墨绳17，石墨绳要分层压实，不得有空隙，实现密封板6与对拉螺杆14之间的密封，防止试压时水从石墨绳17处渗漏；石墨绳压实塞满以后，采用螺栓将压盖8连接在填料函10的法兰上。During installation, on the outside of the pressure vessel 12, pass the pull screw 14 welded on the flange cover 2 through the modified connecting pipe 15, set the sealing gasket I1 on the flange of the connecting pipe 15, align the pull screw 14, and tighten it The connecting bolts of the flange cover 2 and the takeover flange realize the sealed connection between the flange cover 2 and the takeover flange. Inside the pressure vessel 12, first glue the sealing gasket II13 on the inner surface of the pressure vessel 12, and then use the reverse chain to put the connecting pipe sealing device on the pull screw 14, align it, and make the curved surface ring plate 4 compact On the sealing washer II13, the graphite rope 17 is finally stuffed. The graphite rope should be layered and compacted without any gaps, so as to realize the sealing between the sealing plate 6 and the pull screw 14, and prevent water from leaking from the graphite rope 17 during the pressure test. ; After the graphite rope is compacted and filled, the gland 8 is connected to the flange of the stuffing box 10 with bolts.
最后将对拉盖板7盖在密封管5远离压力容器12的一端上，并使对拉盖板7套在对拉螺杆14上，调整位置，使其上的定位板11与观察操作孔16错开。然后安装均力垫板9和锁母18，并将锁母18拧紧。Finally, cover the double-pull cover plate 7 on the end of the sealing tube 5 away from the pressure vessel 12, and make the double-pull cover plate 7 cover on the double-pull screw rod 14, adjust the position so that the positioning plate 11 on it and the observation operation hole 16 stagger. Then install the equal force backing plate 9 and the lock nut 18, and tighten the lock nut 18.
尽管上面结合附图对本发明的优选实施例进行了描述，但是本发明并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，并不是限制性的，本领域的普通技术人员在本发明的启示下，在不脱离本发明宗旨和权利要求所保护的范围的情况下，还可以做出很多形式，这些均属于本发明的保护范围之内。Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, people can also make many forms without departing from the purpose of the present invention and the scope of protection of the claims, and these all belong to the protection scope of the present invention.
Claims (7)
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| CN117213992A (en) * | 2023-11-08 | 2023-12-12 | 宝鸡力兴压力容器装备有限公司 | Pressure testing device of pressure vessel |
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