外文翻譯--低溫液體儲罐

1、<p><b>　　附 錄</b></p><p>　　Shutoff valve for cryogenic liquid storage tank</p><p>　　In order to achieve the foregoing objective, the automatic pressure relief means includes a c

2、ylindrical housing attached to a vent tube having a seat at one end. The other end of the vent tube is attached to a safety regulator valve to vent gas to the atmosphere. The cylindrical housing is closed except for a ho

3、le at its lower end. A steel ball, which has a diameter greater than the hole in the lower end of the housing, is contained within the housing below the seat. As the cryogenic tank is fil</p><p>　　A pressure

4、 relief means includes a vent tube which extends through the neck and which has an exhaust port at its top end and an internal pressure relief valve at its lower end. The internal pressure relief valve only extends a sho

5、rt distance into the vapor space at the top of the inner vessel . A safety pressure relief valve is connected to exhaust port and has a pressure set point above the operating pressure (emptying pressure) of the tank and

6、below the higher delivery pressure (filling pressu</p><p>　　Turning to FIG. 2, the internal pressure relief valve includes a cylindrical housing which is connected to the bottom end of the vent tube. The hou

7、sing is enclosed except that its lower end has a hole therein to allow entry of gas and liquid . Near the top of the housing 36 there is provided a tapered seat which surrounds an opening leading to the vent tube. Enclos

8、ed within the housing is a ball which is formed of steel for example. Other materials may be used as long as they have sufficiently h</p><p>　　In order to fill the tank (FIG. 1), a single delivery hose from

9、a transport tank (not shown) is connected to the inlet/outlet port by means of the coupling and pipe. The vapor pressure in the transport tank causes the cryogenic liquid in the transport tank to flow through the hose, t

10、hrough coupling, through pipe, through pipe, and into the inner vessel. As the cryogenic fluid rises in the inner vessel, the vapor pressure increases until it exceeds the set point of safety pressure relief valve. O<

11、/p><p>　　To assure proper operation of the internal pressure relief valve, the dimensioning of the steel ball and the enclosed housing is critical. Particularly, in a preferred embodiment of the present inventi

12、on in which a steel ball is used, I have found that a 1/2 inch steel ball performs satisfactorily when the inside diameter of the housing 36 is 5/8 inch. Moreover, for a steel ball with a diameter of 1/2 inch, the inside

13、 diameter of the housing must be 5/8 inch plus or minus 1/32 inch. If the insid</p><p>　　If another heat resistant material other than steel is used for the ball, such as a lighter weight heat resistant mate

14、rial, the tolerances on the inside diameter should be less critical. Likewise, using a tapered housing which has a greater diameter at the top and a smaller diameter at the bottom (much like the tapered seat) should like

15、wise provide for less critical dimensional tolerances between the inside diameter of the housing and the diameter of the ball. </p><p>　　Once the float ball engages the tapered seat, further escape of liquid

16、 or vapor from within the inner vessel is substantially inhibited although the metal to metal contact between the ball and the tapered seat will not provide a complete seal. In the context of the present invention the ta

17、pered seat which substantially inhibits the escape of liquid and gas is considered a sealing seat. The use of a sealing gasket such as the O-ring employed by the prior art has been eliminated because such seali</p>

18、<p>　　Even after the valve has been substantially closed by means of the steel ball, cryogenic fluid will continue to flow into the tank until the vapor pressure in the vapor space in the inner vessel equals that

19、of the vapor pressure in the transport tank. That further increase in the level of the liquid in the tank increases the internal vapor pressure inside the inner vessel, and the resulting pressure differential between the

20、 inside of the inner vessel and the set point of the safety pressure reli</p><p>　　As the gas is subsequently withdrawn from vessel 14 through regulator , the pressure of the vapor will be reduced below the

21、set point of safety pressure relief valve, and the steel ball will drop from engagemnet with the tapered seat. With the steel ball disengaged from tapered seat , the tank is ready for the next filling operation. </p&g

22、t;<p>　　In filling tank 10 in FIG. 1, the small amount of vapor and liquid that escapes during the filling operation through port is less economically important than the cost of providing a skilled transport opera

23、tor and/or sophisticated pumping and venting apparatus. Also, the cost of the vented vapor and liquid is small when compared to the cost of additional delivery visits that would result if the tank 10 is only partially fi

24、lled.</p><p>　　There is disclosed an improved internal pressure relief valve for filling a cryogenic liquid storage tank. The internal pressure relief valve consists of a housing with a sealing seat at one e

25、nd, an inlet hole at the other end, and a ball enclosed therein. The internal pressure relief valve is constructed of materials which can withstand the heat encountered during fabrication without melting. Consequently, t

26、he material for the ball is more dense than the cryogenic liquid in the tank so that the</p><p><b>　　低溫液體儲罐</b></p><p>　　為了實現(xiàn)低溫目標，自動泄壓手段包括一個圓柱形住房附在排氣管有座位的一端。另一端的排氣管連接到一個安全調(diào)節(jié)閥泄氣體排放入大氣

27、。圓柱住房除外關(guān)閉了一個洞在其下端。鋼球，其直徑大于桿下端的，是包含在下面的座位上。由于低溫罐體裝貨，鋼球首先響應(yīng)的勢頭氣體逸出的排氣管通過。當?shù)蜏匾后w達到鋼球，增加勢頭的液體，它的體積更大驅(qū)動鋼球接觸到所在的位置和大量阻止氣體外泄通過排氣管。一但通過鋼球所在地，不同的壓力之間的罐和確定安全調(diào)節(jié)閥的排氣管擁有鋼球在對席位，直到填充作業(yè)完成后。雖然鋼球不浮動的低溫液體，勢頭的液體對鋼球在封閉住房足以驅(qū)動鋼球，從而封鎖噴口管。</p&

28、gt;<p>　　壓力救助手段包括一個管口延伸，并有一個排氣口在其最高端和內(nèi)部的壓力安全閥在其下端。內(nèi)部壓力安全閥只延長很短的距離到蒸氣空間上方的距離。一個安全泄壓閥連接到排氣口和有壓力設(shè)定點以上的工作壓力（排空壓力）的罐體和低于更高交付壓力（充氣壓力）的液罐。 內(nèi)部壓力安全閥包括一個圓柱形住房這是連接到低端噴口管。住房附除外，其下端有一個洞，使進入其中的管和液態(tài)天然氣。上方附近的房屋提供了一個錐形座位周圍開放導

29、致排氣管。封閉的住房球是形成鋼鐵為例。其他材料可用于只要有足夠高的熔化溫度，使球能保持在一定的位置，而液罐正在焊接在捏造。材料能夠經(jīng)受熱加工過于密集浮動的低溫液體。因此，不能依靠浮力球，迫使接觸到錐形座椅和密切的內(nèi)部壓力安全閥。已發(fā)現(xiàn)的勢頭低溫液體流入住房可用于推進球到參與錐形座椅，并大大密切的內(nèi)部壓力安全閥。 為了填補箱，單一的交付軟管從運輸罐連接到進/出口通過的耦合器和管道。蒸氣壓在運輸罐造成低溫液體運輸罐流經(jīng)軟管，通過的

30、耦合，通過管道，今日下一管道通過管道，進入內(nèi)船只。由于低溫流體上升內(nèi)船只，蒸汽壓力的增加，直到超過設(shè)定的安全壓力安全閥。一旦設(shè)定點的安全泄壓閥是超過指定</p><p>　　有披露改進內(nèi)部壓力安全閥填補低溫液體儲罐。內(nèi)部壓力安全閥由房屋所在地的密封一端，一個入口洞的另一端，并有一個球封閉。內(nèi)部壓力安全閥是建造的材料，可以承受的熱加工過程中遇到不融化。因此，材料的球更致密比低溫液體的罐體，使球不會漂浮在低溫液體。因