CN112298458A - Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method - Google Patents
Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method Download PDFInfo
- Publication number
- CN112298458A CN112298458A CN202011004720.7A CN202011004720A CN112298458A CN 112298458 A CN112298458 A CN 112298458A CN 202011004720 A CN202011004720 A CN 202011004720A CN 112298458 A CN112298458 A CN 112298458A
- Authority
- CN
- China
- Prior art keywords
- pressure
- safety valve
- protection device
- cargo tank
- vacuum protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000126 substance Substances 0.000 title claims abstract description 33
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 7
- 239000013589 supplement Substances 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims 1
- 238000009423 ventilation Methods 0.000 description 9
- 238000005336 cracking Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/08—Ventilation; Air-conditioning of holds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/02—Ventilation; Air-conditioning
- B63J2/10—Ventilating-shafts; Air-scoops
Abstract
The invention discloses a pressure vacuum protection device of a chemical ship and a propylene oxide cargo hold and a using method thereof. The pressure safety valve locking device is simple in structure and convenient to install and use, the pressure safety valve locking device does not need to be integrally disassembled in the voyage of loading different goods, the pressure safety valve does not need to be disassembled and replaced, the risk of leakage is reduced, and the reliability and the safety are high.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a pressure vacuum protection device of a chemical ship with a propylene oxide cargo hold and a using method thereof.
Background
With the continuous development of the chemical industry, the maritime trade transportation volume of various chemical raw materials is continuously increased. The low boiling point goods such as propylene oxide are important basic chemical raw materials, and more chemical shippers require that new ships can operate the low boiling point goods.
Chemical ships load various goods, and the goods loaded in the same cargo hold at different voyages are different. The cargo hold with the epoxypropane is also installed, during operation, in the voyage for loading conventional goods, the pressure setting of the pressure vacuum safety valve is the same as that of the peripheral conventional cargo hold, the positive pressure is 0.21bar, and the negative pressure is-0.035 bar; however, in a voyage carrying propylene oxide, the pressure of the pressure vacuum relief valve needs to be set to a positive pressure of 0.6bar and a negative pressure of-0.035 bar.
At present, a conventional pressure vacuum safety valve with positive pressure of 0.21bar and negative pressure of-0.035 bar is configured on a cargo hold with the double-mounted propylene oxide, and a pressure safety valve with positive pressure of 0.6bar is additionally stored. In a voyage with propylene oxide, a crew member needs to transport a pressure safety valve with a set positive pressure of 0.6bar stored in the hold from the storage to a ventilation tower top operating platform about 10 meters above the main deck of the hold area and replace the pressure safety valve with a set positive pressure of 0.21bar originally installed on top of the ventilation pipe. In the voyage for loading conventional goods, a crew needs to detach the pressure safety valve with the positive pressure of 0.6bar again and reinstall the pressure safety valve with the positive pressure of 0.21bar on the top of the ventilation pipe, so that the operation is time-consuming and labor-consuming, and the leakage risk is easy to generate.
Disclosure of Invention
In view of the above, the present invention provides a pressure vacuum protection device for a chemical ship and a propylene oxide cargo hold and a using method thereof, so as to solve the problems in the background art.
The utility model provides a chemical boat holds pressure vacuum protection device of epoxypropane cargo hold concurrently, includes the public tube socket of installing on the top of cargo hold ventilation pipe, installs the first pressure relief valve on the first mouth of pipe of public tube socket and installs the second pressure relief valve on the second mouth of pipe of public tube socket, install on the base flange of second pressure relief valve and be used for locking the on off state of second pressure relief valve so that the chemical boat can alternate the locking device who uses with second pressure relief valve in the number of voyages of loading different goods, the horizontal side of second pressure relief valve is connected with the vacuum relief valve.
Preferably, the locking means comprises a lower locking support, an upper locking support, a support sleeve and a locking member,
the lower locking support is arranged on a base flange of the second pressure safety valve oppositely, the upper locking support is fixedly connected with the lower locking support and forms an accommodating space together with the lower locking support for accommodating the second pressure safety valve, the supporting sleeve is fixed at the top of the upper locking support, and the locking piece is screwed into the supporting sleeve and locks the second pressure safety valve in a closed state.
Preferably, the lower locking support is of an L-shaped structure, a straight section of the lower locking support is fixed on a base flange of the second pressure safety valve through a bolt, and a vertical section of the lower locking support is fixed with the upper locking support through a bolt.
Preferably, the upper locking support is of a U-shaped open structure, and the thickness of a top plate of the upper locking support is thicker than that of a sloping plate thereof.
Preferably, the locking piece is a butterfly bolt with a groove arranged at the bottom of the screw, and the shape of the groove is matched with the circular crown structure at the top of the pressure safety valve.
Preferably, the support sleeve is fixed at the center of the top of the upper locking support, and the support sleeve is positioned right above the pressure safety valve.
Preferably, the cracking pressure of the first pressure relief valve is greater than the cracking pressure of the second pressure relief valve.
Preferably, the opening pressure of the first pressure relief valve is 0.6bar and the opening pressure of the second pressure relief valve is 0.21 bar.
Preferably, the top of the vacuum safety valve is provided with an air exhaust cover.
A chemical carrier is used for loading conventional goods, the pressure vacuum protection device is adjusted to enable a second pressure safety valve to be in a normal working state, when the pressure in the cargo hold exceeds the opening pressure of the second pressure safety valve, the second pressure safety valve is opened to release the pressure in the cargo hold, the pressure in the cargo hold is gradually reduced, and when the pressure in the cargo hold is lower than a negative pressure set value, the vacuum safety valve is opened to charge air into the cargo hold for pressure supplement;
when the chemical carrier is in a voyage for loading low-boiling-point goods, the pressure vacuum protection device is adjusted to lock the second pressure safety valve in a closed state, when the pressure in the cargo tank exceeds the opening pressure of the first pressure safety valve, the first pressure safety valve is opened to release the pressure in the cargo tank, the pressure in the cargo tank is gradually reduced, and when the pressure in the cargo tank is lower than a negative pressure set value, the vacuum safety valve is opened to charge air for pressure compensation in the cargo tank.
The invention has the beneficial effects that:
1. the pressure vacuum protection device has a simple and practical structure, two pressure safety valves with the pressure setting of 0.21bar and 0.6bar can be simultaneously installed at the top of the ventilation pipe with the height of about 10 meters on the main deck of the cargo hold area by utilizing the pressure vacuum protection device, and in the voyage of loading different goods, a worker only needs to simply operate the locking device on an operation platform at the top of the ventilation tower, so that the pressure safety valve with the pressure of 0.21bar and the pressure safety valve with the pressure of 0.6bar can correspondingly and alternately work, the operation and the use are very convenient, and the locking device does not need to be integrally disassembled.
2. By using the pressure vacuum protection device, the pressure safety valve does not need to be disassembled and replaced in the voyage of loading different goods, the risk of leakage is reduced, and the reliability and the safety are strong.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pressure vacuum protection device of the present invention.
Fig. 2 is a front view of the locking device.
Fig. 3 is a side view of the locking device.
Fig. 4 is a diagram of the state of use of the pressure vacuum protection device of the present invention.
Fig. 5 is a schematic view of the structure of the retaining member.
The reference numerals in the figures have the meaning:
the locking device comprises a lower locking support 1, an upper locking support 2, a support sleeve 3, a locking piece 4, a second pressure safety valve 5, a base flange 6 of the second pressure safety valve, a containing space 7, a groove 8, a locking device 9, a public pipe seat 10, a first pressure safety valve 11, a cargo compartment ventilation pipe 12, a cargo compartment 13, a vacuum safety valve 14 and an air exhaust cover 15.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected" and "fixed" are used in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The invention provides a pressure vacuum protection device of a chemical ship and a propylene oxide cargo hold, which comprises a common pipe seat 10 arranged at the top of a vent pipe 12 of the cargo hold, a first pressure safety valve 11 arranged on a first pipe orifice of the common pipe seat 10 and a second pressure safety valve 5 arranged on a second pipe orifice of the common pipe seat 10.
The horizontal side of the second pressure safety valve 5 is connected with a vacuum safety valve 14, and the top of the vacuum safety valve 14 is provided with an air exhaust cover 15.
The base flange 6 of the second pressure safety valve 5 is provided with a locking device 9 for locking the opening and closing state of the second pressure safety valve 5 so that the first pressure safety valve 11 and the second pressure safety valve 5 can be alternately used in the voyage of the chemical tanker for loading different cargos.
The locking device 9 comprises a lower locking support 1, an upper locking support 2, a support sleeve 3 and a locking member 4.
The lower locking support 1 is oppositely arranged on a base flange 6 of the second pressure safety valve 5, the upper locking support 2 is fixedly connected with the lower locking support 1 and forms an accommodating space 7 together with the lower locking support 1 for accommodating the second pressure safety valve 5, the support sleeve 3 is fixed at the top of the upper locking support 2, and the locking piece 4 is screwed into the support sleeve 3 and locks the second pressure safety valve 5 in a closed state.
In this embodiment, the lower locking support 1 is an L-shaped structure, a straight section of the lower locking support is fixed on the base flange 6 of the second pressure relief valve 5 by a bolt, a vertical section of the lower locking support is fixed with the upper locking support 2 by a bolt, and when the upper locking member 4 is screwed, the groove 8 formed at the bottom of the screw rod of the upper locking member leaves the circular crown of the pressure relief valve 5 and the bolt between the vertical section of the lower locking support 1 and the upper locking support 2 is unscrewed, the upper locking support 2 in a vertical state can be rotated to a horizontal state, so that the locking device 9 is adjusted to a side position from a locking state.
The upper locking support 2 is of a U-shaped open structure, the top plate of the upper locking support 2 needs to be thicker than the inclined plate of the upper locking support in order to facilitate the welding and fixing of the support sleeve 3 on the top center of the upper locking support 2, the support sleeve 3 is located right above the second pressure safety valve 5, and the inner wall of the support sleeve 3 is provided with internal threads.
The retaining member 4 is a butterfly bolt with a groove 8 formed in the bottom of the screw, and the shape of the groove 8 is matched with the circular crown structure at the top of the second pressure safety valve 5. The retaining member 4 is screwed into the support sleeve 3 and its screw protrudes from the support sleeve 3 and abuts against the circular crown of the second pressure relief valve 5, thereby locking the second pressure relief valve 5 so that the second pressure relief valve 5 is in the closed state.
When the second pressure safety valve 5 does not need to be locked, the locking piece 4 is only required to be screwed up to enable the groove 8 arranged at the bottom of the screw rod of the locking piece to be separated from the circular crown of the pressure safety valve 5, then the bolt between the vertical section of the locking support 1 and the upper locking support 2 is unscrewed, then the upper locking support 2 in the vertical state is rotated to the horizontal state, the locking device can be adjusted to the side-arranged state from the locking state, the second pressure safety valve 5 is enabled to be restored to the normal working state, and the locking device 9 does not need to be integrally disassembled.
In the present embodiment, the cracking pressure of the first pressure relief valve 11 is larger than the cracking pressure of the second pressure relief valve 5. Specifically, the opening pressure of the first pressure relief valve 11 is 0.6bar, and the opening pressure of the second pressure relief valve 5 is 0.21 bar.
By utilizing the pressure vacuum protection device, two pressure safety valves with the pressure setting of 0.21bar and 0.6bar can be simultaneously installed at the top of a cargo compartment ventilation pipe 12 which is about 10 meters higher than a main deck of a cargo compartment area, and in the voyage of loading different goods, a worker only needs to simply operate the locking device 9 on an operation platform at the top of the ventilation tower, so that the pressure safety valve with the pressure setting of 0.21bar and the pressure safety valve with the pressure setting of 0.6bar can correspondingly and alternately work. The invention is simple and practical, is easy to operate on site, reduces the risk of leakage, and has strong reliability and safety.
The method of using the pressure vacuum protection device for the chemical ship with the propylene oxide cargo hold is specifically described below by taking a 38000-ton chemical ship with propylene oxide as an example:
firstly, a locking device 9 is arranged on a 0.21bar pressure safety valve of a cargo hold 13 which also contains propylene oxide;
then, when the chemical boat is loaded with conventional goods, the locking piece 4 is screwed up to enable the groove 8 arranged at the bottom of the screw rod to be away from the circular crown of the pressure safety valve 5, then the bolt between the vertical section of the locking support 1 and the upper locking support 2 is unscrewed, the locking device 9 is adjusted to the side position state, the second pressure safety valve 5(0.21bar pressure safety valve) is in the normal working state, when the pressure in the cargo tank 13 rises to be higher than the opening pressure (0.21bar) of the second pressure safety valve 5, the second pressure safety valve 5 automatically opens to release the pressure in the cargo tank (since the opening pressure of the first pressure safety valve 11 is 0.6bar, the first pressure safety valve 11 is in a closed state at this time), the pressure in the cargo tank 13 gradually decreases, when the pressure in the cargo hold 13 is lower than the negative pressure set value (-0.035bar), the vacuum safety valve 14 is opened to charge the cargo hold 13 for pressure compensation.
When the chemical ship is in a voyage for loading low-boiling-point goods such as propylene oxide and the like, the locking device 9 is adjusted to be in a locking state by unscrewing the bolt between the vertical section of the locking support 1 and the upper locking support 2, then the locking piece 4 is screwed, and the second pressure safety valve 5(0.21bar pressure safety valve) is locked and fixed, so that the second pressure safety valve 5 is in a closing state, when the pressure in the cargo hold 13 is increased to be larger than the opening pressure of the first pressure safety valve 11, the first pressure safety valve 11 is opened to release the pressure in the cargo hold, the pressure in the cargo hold 13 is gradually reduced, and when the pressure in the cargo hold 13 is lower than the negative pressure set value (-0.035bar), the vacuum safety valve 14 is opened to charge and supplement the pressure in the cargo hold 13.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, 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 pressure vacuum protection device for the chemical tanker with the epoxy propane cargo tank is characterized by comprising a common pipe seat mounted at the top of a cargo tank vent pipe, a first pressure safety valve mounted on a first pipe orifice of the common pipe seat and a second pressure safety valve mounted on a second pipe orifice of the common pipe seat, wherein a locking device used for locking the opening and closing state of the second pressure safety valve so that the first pressure safety valve and the second pressure safety valve can be used alternately in the voyage of loading different cargos by the chemical tanker is mounted on a base flange of the second pressure safety valve, and the horizontal side of the second pressure safety valve is connected with a vacuum safety valve.
2. The pressure vacuum protection device for a chemical tanker concurrently equipped with a propylene oxide cargo tank as claimed in claim 1, wherein said locking device comprises a lower locking support, an upper locking support, a support sleeve and a locking member,
the lower locking support is arranged on a base flange of the second pressure safety valve oppositely, the upper locking support is fixedly connected with the lower locking support and forms an accommodating space together with the lower locking support for accommodating the second pressure safety valve, the supporting sleeve is fixed at the top of the upper locking support, and the locking piece is screwed into the supporting sleeve and locks the second pressure safety valve in a closed state.
3. The pressure vacuum protection device for a chemical tanker concurrently equipped with a propylene oxide cargo tank as claimed in claim 2, wherein the lower locking support is an L-shaped structure, a straight section thereof is fixed to a base flange of the second pressure safety valve by bolts, and a vertical section thereof is fixed to the upper locking support by bolts.
4. The pressure vacuum protection device for a chemical tanker equipped with a propylene oxide cargo tank as claimed in claim 2, wherein said upper locking support is of a U-open structure, and the thickness of the top plate of the upper locking support is thicker than the thickness of the inclined plate thereof.
5. The pressure vacuum protection device for the chemical tanker with the epoxy propane cargo tank as claimed in claim 2, wherein the locking member is a butterfly bolt with a groove at the bottom of the screw, and the shape of the groove is matched with the circular crown structure at the top of the pressure safety valve.
6. The pressure vacuum protection device for a chemical tanker concurrently equipped with a propylene oxide cargo tank as claimed in claim 2, wherein said support sleeve is fixed at a central position of the top of the upper locking support, and the support sleeve is located right above the pressure safety valve.
7. The pressure vacuum protection apparatus for a chemical tanker concurrently equipped with a propylene oxide cargo tank as set forth in claim 1, wherein said first pressure relief valve has a higher opening pressure than that of said second pressure relief valve.
8. The pressure vacuum protection device for a chemical tanker concurrently equipped with a propylene oxide cargo tank as set forth in claim 7, wherein the opening pressure of said first pressure relief valve is 0.6bar and the opening pressure of said second pressure relief valve is 0.21 bar.
9. The pressure vacuum protection device for a chemical tanker doubling as a propylene oxide cargo tank as claimed in claim 7, wherein a gas purging cap is installed on top of the vacuum safety valve.
10. A method for using the pressure vacuum protection device of the chemical carrier with the propylene oxide cargo hold as claimed in any one of claims 1 to 9, wherein the pressure vacuum protection device is adjusted to enable the second pressure safety valve to be in a normal working state during the voyage of the chemical carrier for loading the conventional goods, when the pressure in the cargo hold exceeds the opening pressure of the second pressure safety valve, the second pressure safety valve is opened to release the pressure in the cargo hold, the pressure in the cargo hold is gradually reduced, and when the pressure in the cargo hold is lower than the negative pressure set value, the vacuum safety valve is opened to charge the cargo hold for pressure supplement;
when the chemical carrier is in a voyage for loading low-boiling-point goods, the pressure vacuum protection device is adjusted to lock the second pressure safety valve in a closed state, when the pressure in the cargo tank exceeds the opening pressure of the first pressure safety valve, the first pressure safety valve is opened to release the pressure in the cargo tank, the pressure in the cargo tank is gradually reduced, and when the pressure in the cargo tank is lower than a negative pressure set value, the vacuum safety valve is opened to charge air for pressure compensation in the cargo tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011004720.7A CN112298458A (en) | 2020-09-22 | 2020-09-22 | Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011004720.7A CN112298458A (en) | 2020-09-22 | 2020-09-22 | Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112298458A true CN112298458A (en) | 2021-02-02 |
Family
ID=74489843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011004720.7A Pending CN112298458A (en) | 2020-09-22 | 2020-09-22 | Pressure vacuum protection device of chemical ship with epoxy propane cargo hold and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112298458A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489538A (en) * | 2000-12-21 | 2004-04-14 | 普瑞斯-维科工程公司 | Vacuum relief unit with means preventing effects of accident |
| KR100607153B1 (en) * | 2006-04-21 | 2006-08-01 | (주)동명엔터프라이즈 | A cap for controlling pressure and vacuum of oil storage tank |
| KR20120136892A (en) * | 2011-06-10 | 2012-12-20 | 탱크테크 (주) | High velocity pressure relief valve using lever principle |
| CN206175745U (en) * | 2016-10-25 | 2017-05-17 | 天正阀门有限公司 | Big discharge capacity relief valve of bivalve seat |
| US20190154163A1 (en) * | 2016-07-21 | 2019-05-23 | Ventiq As | Pressure relief valve |
-
2020
- 2020-09-22 CN CN202011004720.7A patent/CN112298458A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1489538A (en) * | 2000-12-21 | 2004-04-14 | 普瑞斯-维科工程公司 | Vacuum relief unit with means preventing effects of accident |
| KR100607153B1 (en) * | 2006-04-21 | 2006-08-01 | (주)동명엔터프라이즈 | A cap for controlling pressure and vacuum of oil storage tank |
| KR20120136892A (en) * | 2011-06-10 | 2012-12-20 | 탱크테크 (주) | High velocity pressure relief valve using lever principle |
| US20190154163A1 (en) * | 2016-07-21 | 2019-05-23 | Ventiq As | Pressure relief valve |
| CN206175745U (en) * | 2016-10-25 | 2017-05-17 | 天正阀门有限公司 | Big discharge capacity relief valve of bivalve seat |
Non-Patent Citations (1)
| Title |
|---|
| 宋丽君等: "化学品船载运环氧丙烷时系统的特殊性分析", 《船海工程》 * |
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Application publication date: 20210202 |