JPH0478784A - Sea water leading device for tanker with horizontal bulkhead - Google Patents
Sea water leading device for tanker with horizontal bulkheadInfo
- Publication number
- JPH0478784A JPH0478784A JP18976790A JP18976790A JPH0478784A JP H0478784 A JPH0478784 A JP H0478784A JP 18976790 A JP18976790 A JP 18976790A JP 18976790 A JP18976790 A JP 18976790A JP H0478784 A JPH0478784 A JP H0478784A
- Authority
- JP
- Japan
- Prior art keywords
- cargo oil
- pressure
- oil tank
- seawater
- relief valve
- 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
- 239000013535 sea water Substances 0.000 title claims abstract description 34
- 230000005484 gravity Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 241000287127 Passeridae Species 0.000 description 1
- 208000003028 Stuttering Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
Landscapes
- Safety Valves (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
値−
本牽雲は水平隔壁付きタンカーの海水導入装置に関する
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] Value - The present invention relates to a seawater introduction device for a tanker with horizontal bulkheads.
水平隔壁のない従来型タンカーの場合、座礁等によるタ
ンク底部破孔の際、外界の海水をタンク内に導入するこ
とは、船体の姿勢を崩し、むしろ沈没の危険があるので
、この種の海水導入装置を設けることができなかった。In the case of conventional tankers without horizontal bulkheads, if the bottom of the tank ruptures due to grounding, etc., introducing seawater from the outside world into the tank will cause the hull to lose its posture, and there is a risk of sinking. It was not possible to provide an introduction device.
また、座礁等により損傷を受けた貨油タンクは、−時的
に油の流出が止まっても気象の悪化による船体の動揺や
曳航の際に、再度油が流出しかしながら、水平隔壁付き
タンカーにおいては、海難に際して、アレージスペース
の圧力をカーゴベント支管に挿入された圧力逃し弁で若
干逃がすことで適宜量の外部海水の下部貨油タンクへの
流入を許容するならば、再度油が流出することを防止す
ることができると考えられる。In addition, cargo oil tanks that have been damaged due to grounding, etc. - Even if the oil leakage temporarily stops, oil may leak out again when the ship is shaken or towed due to worsening weather. However, in tankers with horizontal bulkheads, In the event of a marine accident, if an appropriate amount of external seawater is allowed to flow into the lower cargo oil tank by slightly releasing the pressure in the ullage space with a pressure relief valve inserted into the cargo vent branch pipe, oil will not leak out again. It is thought that this can be prevented.
帖綱
本年齋はこのような事情に艦みて提案されたもので、座
礁等の海難事故に際しても、破口からの油流出を最小限
に抑え、海洋汚染防止及び省資源を図る水平隔壁付きタ
ンカーの海水導入構造を提供することを目的とする。The Sho Tsuna Honten Sai was proposed in light of these circumstances, with a horizontal bulkhead that minimizes oil spillage from the breach, prevents marine pollution, and conserves resources in the event of a marine accident such as running aground. The purpose is to provide a seawater introduction structure for tankers.
において、下部貨油タンクのカーゴベント管の上端に圧
力逃し弁を付設し、同圧力逃し弁のリリーフ圧力Poを
下記の関係式:
%式%)
(ただし、P、・・大気圧、γsv・・海水の比重、d
・・吃水、P、・・下部貨油タンクのアレージスペース
の圧力、γ、■・・貨油の比重、h。、1・・下部貨油
タンクの貨油の厚さ、γsw・・海水の比重、hRw・
・下部貨油タンクに導入された海水層の厚さ)
にて設定し、外部海水の導入により貨油の流出を防止す
ることを特徴とする。, a pressure relief valve is attached to the upper end of the cargo vent pipe of the lower cargo oil tank, and the relief pressure Po of the pressure relief valve is expressed by the following relational expression: % formula %) (where P,...atmospheric pressure, γsv...・Specific gravity of seawater, d
・・Hydration, P, ・Pressure in the ullage space of the lower cargo oil tank, γ, ■・・Specific gravity of cargo oil, h. , 1...Thickness of cargo oil in the lower cargo oil tank, γsw...Specific gravity of seawater, hRw...
・Thickness of the seawater layer introduced into the lower cargo oil tank) is set to 100%, and is characterized by preventing cargo oil from flowing out by introducing external seawater.
〔作用〕
このようなIIry:、によれば、海難に際して、圧力
逃し弁を吃水等に応じて若干開閉することで、アレージ
スペースの圧力を若干小さくする。[Function] According to IIry:, in the event of a marine accident, the pressure in the ullage space is slightly reduced by slightly opening and closing the pressure relief valve in accordance with the choking and the like.
そうすると、アレージスペースの圧力と外部海水の圧力
との大小関係で、破口を経て外部海水が下部貨油タンク
に流入し、その下部に海水の層を形成することで、貨油
を破口よりも上方へ押し上げることができる。Then, depending on the magnitude relationship between the pressure in the ullage space and the pressure of the external seawater, external seawater flows into the lower cargo oil tank through the breach, forming a layer of seawater at the bottom of the tank, which removes the cargo oil from the breach. can be pushed upwards.
発−
本nの一実施例を図面について説明すると、第1図はそ
の船体横断9面図である。One embodiment of this invention will be explained with reference to the drawings. FIG. 1 is a nine-plane cross-sectional view of the hull.
航海中には、止弁3は閉鎖されており、下部貨油タンク
6内のアレージスペース部の圧力Ptが、カーゴベント
主管4を経由して他の場所に逃げない様にしである。During the voyage, the stop valve 3 is closed to prevent the pressure Pt in the ullage space in the lower cargo oil tank 6 from escaping to another location via the cargo vent main pipe 4.
本船が座礁等により、下部貨油タンクに破孔8が生じた
場合、破孔8の内外の圧力が釣り合っていれば貨油は流
出しない。このときの状態は次の(1)式で表わされる
。If a hole 8 occurs in the lower cargo oil tank due to the ship being grounded, etc., if the pressure inside and outside the hole 8 is balanced, the cargo oil will not flow out. The state at this time is expressed by the following equation (1).
P 丁+ 7 *ilx h all+ γ s*
xh’sw=P、+γswxd−=−(1)
ここで、
P7・・下部貨油タンク6内のアレージスペース部の圧
力
フ、1・・貨油の比重
h a + +・・下部貨油タンク内の貨油層の厚さ7
8w・・海水の比重
h sw・・下部貨油タンクの下方に導入された海水層
の厚さ
P、・・大気圧
d・・吃水
である。P d+ 7 *ilx h all+ γ s*
xh'sw=P, +γswxd-=-(1) Here, P7...pressure of the ullage space in the lower cargo oil tank 6, 1...specific gravity of cargo oil ha + +... lower cargo oil Thickness of cargo oil layer in tank 7
8w... Specific gravity of seawater h sw... Thickness P of the seawater layer introduced below the lower cargo oil tank,... Atmospheric pressure d... Water stuttering.
しかし水平隔壁10付きタンカーにおいては、Pt#P
、、 γ。、〈γ□、h。5.〈dの不等式が成り立
つ為、破孔8が生じた直後(このときh 、w= 0
)には、右辺の値が左辺の値よりも大きい故、外部の海
水は破孔8から下部貨油タン導入する海水層9の厚さを
(2)式を満足するh avとなるように、圧力逃し弁
1の圧力リリーフ設定値Poを調節する。However, in tankers with horizontal bulkheads 10, Pt#P
,, γ. , 〈γ□, h. 5. 〈Because the inequality of d holds true, immediately after the hole 8 occurs (at this time, h , w = 0
), the value on the right side is larger than the value on the left side, so the thickness of the seawater layer 9 into which external seawater is introduced from the hole 8 into the lower cargo tank is h av that satisfies equation (2). , adjust the pressure relief set point Po of the pressure relief valve 1.
Po=(P、+7swXd)
(P t+ 7 allX h=+++ 7 swX
hsv)・・・・(2)
このように、圧力逃し弁1の圧力リリーフ設定値Poを
設定すれば、下部貨油タンク6の下方に海水層9がh
swの厚みをもって形成される為、気象条件の悪化等で
船体が動揺したり、曳航する際に、破孔8から貨油が流
出する危険がなくなるとともに必要以上に海水が流入し
て本船が沈没する危険がなくなる。Po=(P, +7swXd) (P t+ 7 allX h=+++ 7 swX
hsv)...(2) In this way, if the pressure relief setting value Po of the pressure relief valve 1 is set, the seawater layer 9 is
Because it is formed with a thickness of sw, there is no risk of cargo oil leaking out from the hole 8 when the ship is shaken due to worsening weather conditions or being towed, and the ship will sink due to excessive seawater flowing in. There is no danger of doing so.
発明
〔弊案の効果〕
このような構造によれば、座礁等の海難事故による損傷
部からの油の再流出を防ぎ、事故による環境破壊を最小
限にとどめることができる。Invention [Effects of Our Plan] According to such a structure, it is possible to prevent oil from flowing out again from a damaged part due to a marine accident such as a grounding, and to minimize environmental damage caused by the accident.
その際、導入される海水は一定高さに押えられるので、
必要以上に海水が流入して本船が沈カーにおいて、下部
貨油タンクのカーゴベント管の上端に圧力逃し弁を付設
し、同圧力逃し弁のリリーフ圧力Poを下記の関係式
%式%)
(ただし、P、・・大気圧、γsv・・海水の比重、d
・・吃水、2丁・・下部貨油タンクのアレーシスペース
の圧力、γ。、・・貨油の比重、h all・・下部貨
油タンクの貨油の厚さ、γsv・・海水の比重、h s
v・・下部貨油タンクに導入された海水層の厚さ)
にて設定し、外部海水の導入により貨油の流出を防止す
ることにより、座礁等の海難事故に際しても、破口から
の油流出を最小限に抑え、業上極めて有益なものである
。At that time, the introduced seawater is held down to a certain height, so
If the ship sinks due to the inflow of seawater more than necessary, a pressure relief valve is attached to the upper end of the cargo vent pipe of the lower cargo oil tank, and the relief pressure Po of the pressure relief valve is calculated using the following relational formula (%) (%) However, P: atmospheric pressure, γsv: specific gravity of seawater, d
・・Droplets, 2 units・・Pressure in the lower cargo oil tank's array space, γ. ,... Specific gravity of cargo oil, h all... Thickness of cargo oil in the lower cargo oil tank, γsv... Specific gravity of seawater, h s
v...thickness of the seawater layer introduced into the lower cargo oil tank), and by introducing external seawater to prevent cargo oil from flowing out, even in the event of a marine accident such as a grounding, oil will not leak out from the breach. This minimizes leakage and is extremely beneficial for business.
aJll
第1図は本年雀の一実施例を示す水平隔壁付きタンカー
の横断面図である。
1・・・圧力逃し弁、2・・・カーゴベント枝管、3・
・・止弁、4・・カーゴベント主管、5・上部貨油タン
ク、6・・下部貨油タンク、7P・・左舷ノ・ラストタ
ンク、7S・・・右舷バラストタンク、8破孔、9・・
・海水層、10・・・水平隔壁、γ。1.・・・貨油の
比重、γ、V・・・海水の比重、d・・・吃水、h e
l l・・・下部貨油タンク6内の貨油層の厚さ、h
sv・・・下部貨油タンク6内の下方に導入された海
水層9の厚さ、Po・・・圧力逃し弁1の圧力IJ I
J−フ設定値、P、・・・大気圧、Pt・・・下部貨油
タンク6内アレーシスペース部の圧力、代理人 弁理士
塚 本 正 文aJll Figure 1 is a cross-sectional view of a tanker with horizontal bulkheads showing one embodiment of this year's sparrow. 1...Pressure relief valve, 2...Cargo vent branch pipe, 3.
... Stop valve, 4. Cargo vent main pipe, 5. Upper cargo oil tank, 6. Lower cargo oil tank, 7P. Port last tank, 7S... Starboard ballast tank, 8 hole, 9.・
・Seawater layer, 10...Horizontal bulkhead, γ. 1. ...Specific gravity of cargo oil, γ, V...Specific gravity of seawater, d...Hot water, h e
l l...thickness of the cargo oil layer in the lower cargo oil tank 6, h
sv...Thickness of the seawater layer 9 introduced below into the lower cargo oil tank 6, Po...Pressure of the pressure relief valve 1 IJ I
J-f set value, P...atmospheric pressure, Pt...pressure of the array space in the lower cargo oil tank 6, agent Masafumi Tsukamoto, patent attorney
Claims (1)
ゴベント管の上端に圧力逃し弁を付設し、同圧力逃し弁
のリリーフ圧力P_oを下記の関係式: P_o=(P_a+r_s_w×d)− (P_r+r_e_i_l×h_e_i_l+r_s_
w×h_s_w)(ただし、P_a・・大気圧、r_s
_w・・海水の比重、d・・吃水、P_r・・下部貨油
タンクのアレージスペースの圧力、r_e_i_l・・
貨油の比重、h_e_i_l・・下部貨油タンクの貨油
の厚さ、r_s_w・・海水の比重、h_s_w・・下
部貨油タンクに導入された海水層の厚さ) にて設定し、外部海水の導入により貨油の流出を防止す
ることを特徴とする水平隔壁付きタンカーの海水導入装
置。[Claims] In a tanker with a horizontal bulkhead, a pressure relief valve is attached to the upper end of the cargo vent pipe of the lower cargo oil tank, and the relief pressure P_o of the pressure relief valve is expressed by the following relational expression: P_o=(P_a+r_s_w×d ) − (P_r+r_e_i_l×h_e_i_l+r_s_
w×h_s_w) (However, P_a...atmospheric pressure, r_s
_w・・Specific gravity of seawater, d・・Swallow water, P_r・・Pressure of ullage space of lower cargo oil tank, r_e_i_l・・
Specific gravity of cargo oil, h_e_i_l...thickness of cargo oil in the lower cargo oil tank, r_s_w...specific gravity of seawater, h_s_w...thickness of the seawater layer introduced into the lower cargo oil tank), and external seawater. A seawater introduction device for a tanker with a horizontal bulkhead, which is characterized by the introduction of a horizontal bulkhead to prevent the outflow of cargo oil.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18976790A JPH0478784A (en) | 1990-07-18 | 1990-07-18 | Sea water leading device for tanker with horizontal bulkhead |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18976790A JPH0478784A (en) | 1990-07-18 | 1990-07-18 | Sea water leading device for tanker with horizontal bulkhead |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0478784A true JPH0478784A (en) | 1992-03-12 |
Family
ID=16246848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18976790A Pending JPH0478784A (en) | 1990-07-18 | 1990-07-18 | Sea water leading device for tanker with horizontal bulkhead |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0478784A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6352444B1 (en) | 1997-09-30 | 2002-03-05 | The Whitaker Corporation | Coaxial connector, coaxial connector assembly and method of fabrication thereof |
-
1990
- 1990-07-18 JP JP18976790A patent/JPH0478784A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6352444B1 (en) | 1997-09-30 | 2002-03-05 | The Whitaker Corporation | Coaxial connector, coaxial connector assembly and method of fabrication thereof |
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