CN105217178A - A kind of central drainage system for External floating roof tank and ballasting method thereof - Google Patents
A kind of central drainage system for External floating roof tank and ballasting method thereof Download PDFInfo
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- CN105217178A CN105217178A CN201510754454.2A CN201510754454A CN105217178A CN 105217178 A CN105217178 A CN 105217178A CN 201510754454 A CN201510754454 A CN 201510754454A CN 105217178 A CN105217178 A CN 105217178A
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- clump weight
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Abstract
The invention discloses a kind of central drainage system for External floating roof tank, comprise floating plate (1), catch pit (2) and discharge port (3), also comprise the central drain (4) of the S shape be arranged in storage tank inner chamber and some clump weights (5) be fixed on central drain (4).The invention also discloses a kind of ballasting method of central drainage system, be less than or equal to the spacing between a upper adjacent clump weight (5) along body upper end to lower end, except the spacing between first and last arbitrary clump weight (5) clump weight adjacent with the next one (5).Technical scheme structure of the present invention is simple, and binding site is less, and the possibility of seepage is low, long service life, and install, easy to maintenance, body can also be avoided to occur floating movement and be wound around with the pillar (7) of surrounding simultaneously.
Description
Technical field
The present invention relates to a kind of central drainage system for External floating roof tank, also relate to a kind of ballasting method of the central drainage system for External floating roof tank.
Background technology
External floating roof tank is the common open type store tools of petroleum chemical industry, its pillar mainly comprising the columnar tank of top end opening, floating plate and be vertically arranged at bottom floating plate, floating plate outward flange matches with inner tank wall, form a closed storage tank inner chamber with tank body, and floating plate is elevated along with the change of the oil reserve of storage tank inner chamber.Because External floating roof tank is directly exposed in external environment, and floating plate is lower than the upper limb of tank body, natural sleet can directly land and save bit by bit the upper surface at floating plate, and when saving bit by bit too much, rainwater or snowmelt runoff can penetrate in storage tank inner chamber, even causes the accidents such as floating plate distortion or heavy top.Therefore External floating roof tank is provided with special central drainage system usually.
The delivery piping of the central drainage system of existing External floating roof tank is all arranged in storage tank inner chamber, delivery piping mainly contains two kinds: one is rigidity swivel coupling formula delivery piping, it is connected with rigidity swivel coupling by steel pipe, junction has sealing arrangement, its shortcoming is the lifting along with floating plate, rigidity swivel coupling place constantly rotates can damage sealing arrangement, and finally cause delivery piping to leak, leak tightness is poor, the life-span is short; Another kind is pivoting delivery piping, relative to rigidity swivel coupling formula delivery piping, it adopts flexible steel in flat section tubing to replace rigidity swivel coupling, along with floating plate lifting flexible steel in flat section tubing can not damage easily because of torsion, but because the flexible radius of curvature of flexible steel in flat section tubing is larger, when the oil in storage tank inner chamber is less, floating plate distance storage tank intracavity bottom is comparatively near, and flexible steel in flat section tubing bending amplitude great Yi causes the impeded drainage of flexible steel in flat section tubing even to damage.In addition, the junction of rigidity swivel coupling formula delivery piping and pivoting delivery piping is all many, and occur that the possibility of seepage is also thereupon higher, the difficulty of installation and maintenance is also higher.
Summary of the invention
In order to the leak tightness solving existing External floating roof tank central drainage system is poor, the life-span is short and the problem such as impeded drainage, the present invention proposes a kind of central drainage system and ballasting method thereof.
Technical solution of the present invention is as follows:
For a central drainage system for External floating roof tank, comprise floating plate, be arranged at the catch pit be connected below floating plate and with floating plate upper surface and the discharge port being arranged at storage tank intracavity bottom, described catch pit has water outlet; The described central drainage system for External floating roof tank also comprises the central drain of the S shape be arranged in storage tank inner chamber and some clump weights be fixed on central drain, described central drain comprises flexible body and is arranged on the butt flange at the upper and lower two ends of body, the described butt flange of central drain upper end is connected with the water outlet of catch pit, and the butt flange of described central drain lower end to be connected with discharge port by water discharging hard pipe or to be directly connected with discharge port;
Be initial point with body near one end of catch pit, with body near one end of discharge port for terminal, be less than or equal to the spacing between a upper adjacent clump weight from initial point to terminal direction, except the spacing first and last arbitrary clump weight clump weight adjacent with the next one;
The body of described central drain comprises in screw-shaped to be strengthened spring, is covered in interlayer outside interior reinforcement spring and the screw-shaped be arranged at outside interlayer strengthens spring outward, described interior reinforcement spring is identical with the hand of spiral of outer reinforcement spring, helical pitch is equal, and the outer helical trajectory strengthening spring is positioned at the screw-shaped gap location of reinforcement spring.
Further improvement as the described central drainage system for External floating roof tank: described body also comprises the High molecular material internal layer be arranged at inside interior reinforcement spring and the High molecular material sheath be arranged at outside outer reinforcement spring.
A kind of ballasting method of central drainage system: be initial point with body near one end of catch pit, with body near one end of discharge port for terminal, along distributing installation clump weight from the off on tube length direction, clump weight is fixed on body, and is less than or equal to the spacing between a upper adjacent clump weight from initial point to terminal direction, except the spacing first and last arbitrary clump weight clump weight adjacent with the next one.
Further improvement as described ballasting method: before installation clump weight, first determine total length and the volume of central drain body, calculate when floating plate is in the extreme higher position of use stroke, central drain body is all positioned at gross buoyancy suffered by storage tank intracavity bottom; Then adjust the weight of clump weight, make the weight of each clump weight be equal to 1/80 of gross buoyancy size in above-mentioned steps; During distributing installation clump weight, along on tube length direction from the off, 7%, 17%, 24%, 28%, 32%, 36%, 40%, 43%, 46%, 48%, 50%, 52%, 54% place that is positioned at total length installs a clump weight respectively, evenly eight clump weights are installed at 56% to 70% section, evenly seven clump weights are installed at 71% to 80% section, evenly eight clump weights are installed at 81% to 90% section, evenly ten clump weights are installed at 91% to 100% section.
The present invention has following good effect: (1) technical scheme structure of the present invention is simple, and binding site is less, and the possibility of seepage is lower, long service life, and install, easy to maintenance; (2) the body entirety of central drain is flexible, not easily causes the damage of body because reversing, rotating; (3) in, reinforcement spring and outer reinforcement spring are spiral fashion, and interlayer is clamped in centre, make body have very high intensity; (4) the High molecular material internal layer be arranged at inside interior reinforcement spring can make the resistance of reduction current, accelerates the speed of draining, and the High molecular material sheath be arranged at outside outer reinforcement spring can be protected tubular body; (5) body is S shape, and length direction has allowance, and during floating plate lifting, body can not be subject to larger pulling force or occur larger bending; (6) body has interior reinforcement spring and outer reinforcement spring, has certain rigidity, is conducive to body and keeps S shape, can not occur mobile easily and be wound around with the pillar of surrounding, and can ensure that tubular body current are unobstructed; (7) central drain is provided with clump weight, the buoyancy suffered by central drain can be overcome, prevent from Central Drainage canal float from moving being intertwined with the pillar of surrounding or central drain self is wound around; (8) the central drain lower end scope that comparatively large and buoyancy changes in floating plate lifting process by buoyancy is larger, and the scope that central drain upper end changes in floating plate lifting process by the less and buoyancy of buoyancy is very little, ballasting method provided by the present invention can ensure that the weight of the clump weight of central drain lower end is comparatively large, the weight of the clump weight of central drain upper end is less, counterweight is conformed to substantially with buoyancy distribution, reduce buoyancy and other application force to the disturbance of central drain, further guarantee body stability-of-path, can not interfere with pillar; (9) oil inlet of exterior float disc storage tank and oil outlet are generally all located at the bottom of storage tank inner chamber, therefore when oil mass changes, the lower end of central drain is vulnerable to disturbance most, ballasting method provided by the present invention makes that the clump weight quantity of central drain lower end is more, interval is comparatively near, effectively can prevent central drain lower end when storage tank turnover oil because being intertwined with pillar by disturbance is moved; (10) ballasting method provided by the present invention makes clump weight can unify processing, and anufacturability is good, contributes to reducing costs.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of floating plate of the present invention when being positioned at higher position.
Fig. 2 is the overall structure schematic diagram of floating plate of the present invention when being positioned at lower position.
Fig. 3 is the structural representation of central drain body of the present invention.
Detailed description of the invention
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
As Fig. 1, a kind of central drainage system for External floating roof tank, comprise floating plate 1, be arranged at the catch pit 2 be connected below floating plate 1 and with floating plate 1 upper surface and the discharge port 3 being arranged at storage tank intracavity bottom, described catch pit 2 has water outlet; The described central drainage system for External floating roof tank also comprises the central drain 4 of the S shape be arranged in storage tank inner chamber and some clump weights 5 be fixed on central drain 4, described central drain 4 comprises flexible body and is arranged on the butt flange at the upper and lower two ends of body, the butt flange of described central drain 4 upper end is connected with the water outlet of catch pit 2, and the butt flange of described central drain 4 lower end is connected with discharge port 3 by water discharging hard pipe 6.
Be initial point with body near one end of catch pit 2, with body near one end of discharge port 3 for terminal, be less than or equal to the spacing between a upper adjacent clump weight 5 from initial point to terminal direction, except the spacing first and last arbitrary clump weight 5 clump weight adjacent with the next one 5.
As Fig. 3, the body of described central drain 4 comprises in screw-shaped to be strengthened spring 4-1, is covered in interlayer 4-3 outside interior reinforcement spring 4-1 and the screw-shaped be arranged at outside interlayer 4-3 strengthens spring 4-2 outward, described interior reinforcement spring 4-1 and outer reinforcement spring 4-2 hand of spiral is dextrorotation, helical pitch is 40mm, and the outer helical trajectory strengthening spring 4-2 is positioned at the screw-shaped gap location of reinforcement spring 4-1.Described body also comprises the High molecular material internal layer 4-5 be arranged at inside interior reinforcement spring 4-1 and the High molecular material sheath 4-4 be arranged at outside outer reinforcement spring 4-2, and the inner wall smooth of High molecular material internal layer 4-5, can ensure that tubular body current are unobstructed.
As Fig. 1 and 2, because body changes along with the degree of depth of present position by buoyancy and suffered buoyancy, when needing to avoid floating plate 1 to be elevated, there is floating movement and occur to be wound around with the pillar 7 in tank inner chamber interfering in central drain 4 simultaneously in shape change process, therefore when installing clump weight 5, need to carry out counterweight for the distribution situation of buoyancy, the stability-of-path of central drain 4 during to ensure that floating plate 1 is elevated.Concrete grammar is: before installation clump weight 5, first determine total length and the volume of central drain 4 body, calculates when floating plate 1 is in the extreme higher position of use stroke, central drain 4 body is all positioned at gross buoyancy suffered by storage tank intracavity bottom; Then adjust the weight of clump weight 5, make the weight of each clump weight 5 be equal to 1/80 of gross buoyancy size in above-mentioned steps.Clump weight 5 is installed, be initial point with body near one end of the water outlet of catch pit 2, with body near one end of discharge port 3 for terminal, along on tube length direction from the off, 7%, 17%, 24%, 28%, 32%, 36%, 40%, 43%, 46%, 48%, 50%, 52%, 54% place that is positioned at total length installs a clump weight 5 respectively, evenly eight clump weights 5 are installed at 56% to 70% section, evenly seven clump weights 5 are installed at 71% to 80% section, evenly eight clump weights 5 are installed at 81% to 90% section, evenly ten clump weights 5 are installed at 91% to 100% section.When clump weight 5 is installed, use bolt to be fixed on body by clump weight 5, and ensure from initial point to terminal direction, be less than or equal to the spacing between a upper adjacent clump weight 5 except the spacing first and last arbitrary clump weight 5 clump weight adjacent with the next one 5.
In use, the rainwater on floating plate 1 or snowmelt runoff can arrive catch pit 2 to External floating roof tank, then flow to External floating roof tank along central drain 4 from discharge port 3 under gravity, complete draining.Simultaneously, floating plate 1 can be elevated along with the change of the oil reserve in storage tank inner chamber, the upper end of central drain 4 can be elevated along with floating plate 1 thus tubular form changes, but the body entirety due to central drain 4 is flexible, body has interior reinforcement spring 4-1 and outer reinforcement spring 4-2, body is made to have certain rigidity, clump weight 5 effectively can overcome the impact of buoyancy simultaneously, therefore body can keep S shape, can not floating movement be there is easily and be wound around with the pillar 7 of surrounding, and ensure that the current of tubular body are unobstructed.
Claims (4)
1. the central drainage system for External floating roof tank, comprise floating plate (1), be arranged at floating plate (1) below and the catch pit (2) be connected with floating plate (1) upper surface and the discharge port (3) being arranged at storage tank intracavity bottom, described catch pit (2) has water outlet, it is characterized in that: the described central drainage system for External floating roof tank also comprises the central drain (4) of the S shape be arranged in storage tank inner chamber and some clump weights (5) be fixed on central drain (4), described central drain (4) comprises flexible body and is arranged on the butt flange at the upper and lower two ends of body, the butt flange of described central drain (4) upper end is connected with the water outlet of catch pit (2), the butt flange of described central drain (4) lower end is connected with discharge port (3) by water discharging hard pipe (6), or be directly connected with discharge port (3),
Be initial point with body near one end of catch pit (2), with body near one end of discharge port (3) for terminal, be less than or equal to the spacing between a upper adjacent clump weight (5) from initial point to terminal direction, except the spacing first and last arbitrary clump weight (5) clump weight adjacent with the next one (5);
The body of described central drain (4) comprises in screw-shaped the screw-shaped strengthened spring (4-1), be covered in the interlayer (4-3) in interior reinforcement spring (4-1) outside and be arranged at interlayer (4-3) outside and strengthens spring (4-2) outward, described interior reinforcement spring (4-1) is identical with the hand of spiral of outer reinforcement spring (4-2), helical pitch is equal, and the helical trajectory strengthening spring (4-2) is outward positioned at the screw-shaped gap location of reinforcement spring (4-1).
2. as claimed in claim 1 for the central drainage system of External floating roof tank, it is characterized in that: described body also comprises the High molecular material internal layer (4-5) being arranged at interior reinforcement spring (4-1) inner side and the High molecular material sheath (4-4) being arranged at outer reinforcement spring (4-2) outside.
3. the ballasting method of a central drainage system, it is characterized in that: be initial point with body near one end of catch pit (2), with body near one end of discharge port (3) for terminal, along distributing installation clump weight (5) from the off on tube length direction, clump weight (5) is fixed on body, and is less than or equal to the spacing between a upper adjacent clump weight (5) from initial point to terminal direction, except the spacing first and last arbitrary clump weight (5) clump weight adjacent with the next one (5).
4. the ballasting method of central drainage system as claimed in claim 3, it is characterized in that: before installation clump weight (5), first determine total length and the volume of central drain (4) body, calculate when floating plate (1) is in the extreme higher position of use stroke, central drain (4) body is all positioned at gross buoyancy suffered by storage tank intracavity bottom; Then adjust the weight of clump weight (5), make the weight of each clump weight (5) be equal to 1/80 of gross buoyancy size in above-mentioned steps; Time distributing installation clump weight (5), along on tube length direction from the off, 7%, 17%, 24%, 28%, 32%, 36%, 40%, 43%, 46%, 48%, 50%, 52%, 54% place that is positioned at total length installs a clump weight (5) respectively, evenly eight clump weights (5) are installed at 56% to 70% section, evenly seven clump weights (5) are installed at 71% to 80% section, evenly eight clump weights (5) are installed at 81% to 90% section, evenly ten clump weights (5) are installed at 91% to 100% section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510754454.2A CN105217178B (en) | 2015-11-09 | 2015-11-09 | A kind of central drainage system for External floating roof tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510754454.2A CN105217178B (en) | 2015-11-09 | 2015-11-09 | A kind of central drainage system for External floating roof tank |
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| Publication Number | Publication Date |
|---|---|
| CN105217178A true CN105217178A (en) | 2016-01-06 |
| CN105217178B CN105217178B (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510754454.2A Active CN105217178B (en) | 2015-11-09 | 2015-11-09 | A kind of central drainage system for External floating roof tank |
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| CN (1) | CN105217178B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683224A (en) * | 2019-10-31 | 2020-01-14 | 安徽省国发石化设备有限责任公司 | Track hose for floating roof drainage suitable for oil tank |
| CN110820888A (en) * | 2019-10-31 | 2020-02-21 | 安徽省国发石化设备有限责任公司 | Hose drainage system at center of floating roof storage tank |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB849190A (en) * | 1958-04-07 | 1960-09-21 | John Henry Wiggins | Automatic emergency drain mechanisms for floating roofs of field storage tanks |
| FR2321082A1 (en) * | 1975-08-12 | 1977-03-11 | Joint Francais | Rainwater runoff flap valve for liq. tank - has membrane spanning partition to allow accumulated water to pass |
| RU2120902C1 (en) * | 1997-09-30 | 1998-10-27 | Уфимский государственный нефтяной технический университет | Water drain for reservoir floating roofs |
| CN2509124Y (en) * | 2001-12-01 | 2002-09-04 | 浙江乐鼎波纹管有限公司 | Central drain for external floating-roof oil tank |
| CN2781146Y (en) * | 2005-04-14 | 2006-05-17 | 王利先 | Central drainage flexible pipe |
| WO2011119429A8 (en) * | 2010-03-23 | 2012-04-12 | Saudi Arabian Oil Company | Storage tank floating roof sump with emergency overflow |
-
2015
- 2015-11-09 CN CN201510754454.2A patent/CN105217178B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB849190A (en) * | 1958-04-07 | 1960-09-21 | John Henry Wiggins | Automatic emergency drain mechanisms for floating roofs of field storage tanks |
| FR2321082A1 (en) * | 1975-08-12 | 1977-03-11 | Joint Francais | Rainwater runoff flap valve for liq. tank - has membrane spanning partition to allow accumulated water to pass |
| RU2120902C1 (en) * | 1997-09-30 | 1998-10-27 | Уфимский государственный нефтяной технический университет | Water drain for reservoir floating roofs |
| CN2509124Y (en) * | 2001-12-01 | 2002-09-04 | 浙江乐鼎波纹管有限公司 | Central drain for external floating-roof oil tank |
| CN2781146Y (en) * | 2005-04-14 | 2006-05-17 | 王利先 | Central drainage flexible pipe |
| WO2011119429A8 (en) * | 2010-03-23 | 2012-04-12 | Saudi Arabian Oil Company | Storage tank floating roof sump with emergency overflow |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683224A (en) * | 2019-10-31 | 2020-01-14 | 安徽省国发石化设备有限责任公司 | Track hose for floating roof drainage suitable for oil tank |
| CN110820888A (en) * | 2019-10-31 | 2020-02-21 | 安徽省国发石化设备有限责任公司 | Hose drainage system at center of floating roof storage tank |
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| Publication number | Publication date |
|---|---|
| CN105217178B (en) | 2017-07-18 |
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