US3613937A - Floating roof hydrocarbon tank - Google Patents

Floating roof hydrocarbon tank Download PDF

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Publication number
US3613937A
US3613937A US28634A US3613937DA US3613937A US 3613937 A US3613937 A US 3613937A US 28634 A US28634 A US 28634A US 3613937D A US3613937D A US 3613937DA US 3613937 A US3613937 A US 3613937A
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US
United States
Prior art keywords
tank
vertical
sidewall
floating roof
flattened
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.)
Expired - Lifetime
Application number
US28634A
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English (en)
Inventor
Francis Schlecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Constructions Metalliques de Provence
CONSTRUCTEURS ASSOCIES POUR
Original Assignee
Constructions Metalliques de Provence
CONSTRUCTEURS ASSOCIES POUR
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Filing date
Publication date
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Application granted granted Critical
Publication of US3613937A publication Critical patent/US3613937A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/544—Large containers characterised by means facilitating filling or emptying for filling from below

Definitions

  • Lobato ABSTRACT A hydrocarbon tank of the cylindrical vessel and floating roof type comprising at its base, on the tank skirt, fluid inlet nozzles in the form of flattened, ducts disposed near the bottom and provided with vertical curvilinear parallel baffle plates leaving a small gap between their outermost vertical edges and the adjacent tank wall in order to produce a whirling motion in the fluid, and a nozzle of same type connected to the discharge or draining pipe and to a radial duct in the form of a flattened tunnel.
  • one fraction of the tank capacity is filled by using pipes or nozzle tubes of the type having their outlets positioned very close to the bottom and which, according to the tank diameter, may be one, two or three in number, or even more, with a total height not in excess of 12 inches.
  • these bottom inlet pipes are provided with specially designed deflectors or baffle plates adapted to impart a gyratory motion to the incoming liquid which causes the sediments contained in the liquid to be put in suspension and collected near the central area ofthe tank bottom.
  • said deflectors or baffle plates are arranged in a manner leaving a gap between them and said vertical walls.
  • the liquid product is drained off the tank by suction through a central duct of flattened or rectangular cross sectional contour connected to a bottom outflared spout.
  • the tank bottom has a conical configuration with the apex below the base and of a height depending on the tank diameter.
  • the floating roof can descend to a very low position limited only by the vertical dimension of the tank bottom piping, i.e. about l2 inches.
  • a whirling motion is imparted to the liquid, the heavier particles are put in suspension and discharged by the central suction constituting the vortex center experience confirms theoretical calculation in that the tank can be drained completely while preserving the buoyancy of the floating roof.
  • FIG. 1 is a vertical diametral section showing the floating roof of a tank in its lowermost position
  • FIG. 2 is a diagrammatic plane view of the structure without the roof
  • FIG. 3 is an elevational view of a feed pipe
  • FIG. 4 is a vertical section taken along the line IV-IV of FIG. 3;
  • FIG. 5 is another section taken along the line V-V of FIG. 4 and showing a feed pipe
  • FIG. 6 is a vertical section taken along the line Vl--VI of FIG. 7, the latter showing a fragmentary plane view of the out- 70 let of the feed pipe leading into the tank;
  • FIG. 8 is an elevational view of a discharge or draining pipe
  • FIG. 9 is a plane view of the draining pipe of FIG. 8;
  • FIG. 10 is a section taken along the line X-X of FIG. 9; and 75 FIG. 11 is an end view of the tunnel inlet.
  • the tank illustrated by way of example in the drawing comprises a cylindrical container or vessel 1 in which a floating roof 2 is adapted to slide down to a lowermost position very close to the tank bottom 3 when the tank is empty.
  • the minimum distance between the floating roof and the tank bottom is usually 3 to 4 feet in conventional tank structures but in this case it is reduced to about 10 inches by virtue of the particular construction of the bottom and inlet and draining piping systems which are described hereinafter.
  • the feed manifold 17 supplying'the: inlet pipes 13 which, in the example illustrated, are three in number with a diameter of about 3 to 4 feet, are connected to three tank bottom" nozzles 4 having a height of about 10 inches, which open into the vessel.
  • These nozzles consist each for example of a sheet metal assembly comprising an elongated rectangular end section 14 welded to the peripheral annular member 5 and to the reinforced skirt 1 of the tank.
  • Each member 14 is connected through an outflared portion 15 of the filling pipe 13, that is, a portion having a height decreasing gradually from this pipe to said nozzle.
  • baffle plates 6 Registering with each pipe outlet and welded to the bottom 3 are baffle plates 6 curved in the same direction and preferably parallel.
  • the floating roof can be lowered down to the upper level of nozzles 4, that is, about 12 inches above the bottom, and on the other hand the heavier particles or sediments are collected centrally of the tank bottom.
  • the nozzles 4 may have a circular cross-sectional contour, as illustrated in FIG. 3, but if desired other shapes may be used, provided that it will not cause any throttling of the liquid flow and will reserve a minimum space above the tank bottom.
  • the tank is drained by using a central suction device consisting of a flattened pipe or radial tunnel 8 extending from the center of the tank bottom where it has substantially the shape of an outflared spout 9, this tunnel 8 being connected outside the vessel 1 to a tapered outlet nozzle 10 of same type as the filling nozzle (FIGS. 8 and 9).
  • a central suction device consisting of a flattened pipe or radial tunnel 8 extending from the center of the tank bottom where it has substantially the shape of an outflared spout 9, this tunnel 8 being connected outside the vessel 1 to a tapered outlet nozzle 10 of same type as the filling nozzle (FIGS. 8 and 9).
  • the tunnel 8 will be directed with due consideration for the direction of flow of the fluid, in order to minimize any interference with the whirling motion of the liquid during the filling operation.
  • the cross-sectional contour of said tunnel 8 and of the outlet aperture 16 of its outflared spout 9 may be designed as shown by way of example in FIGS. 10 and 11.
  • the bottom of this tank has a slightly tapered cross-sectional shape, with the apex 18 disposed beneath the base and a height f depending on the tank diameter.
  • the tank can be drained nearly completely, the floating roof constantly remaining in suspen- SIOI'I.
  • a tank having a vertical cylindrical sidewall, a bottom wall with an annular peripheral portion extending radially outwardly from and peripherally of said sidewall and a floating roof, notably for the storage of crude hydrocarbon products, said tank being provided with a filling means comprising inlet pipes connected to inlet nozzles disposed along the outer periphery and at the bottom of the cylindrical wall, said inlet nozzles being constructed in the form of flattened ducts positioned near the bottom wall, vertical curvilinear and parallel baffle plates positioned radially inwardly of and in the discharge path of each of said nozzles and leaving a small passage between their outer vertical edges and the vertical sidewall of the tank, at least one outlet nozzle also disposed at the periphery of and at the bottom of the tank, and a radial tunnellike flattened duct opening into the central portion of the bottom of said tank at one end and into said last-mentioned nozzle at the other end.
  • said inlet nozzles each consist of a sheet metal assembly comprising an elongated end portion having its greater dimension extending circumferentially of the tank sidewall and being welded to the annular peripheral portion of the tank bottom wall and to a reinforcing skirt element at the bottom of the vertical sidewall, and a portion flaring in a direction radially inwardly of the tank for connecting the elongated end portion to the inlet pipe.
  • Tank according to claim I wherein the tank bottom has an inverted conical configuration with the apex lower than the base and a height depending on the tank diameter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Extraction Or Liquid Replacement (AREA)
US28634A 1969-04-15 1970-04-15 Floating roof hydrocarbon tank Expired - Lifetime US3613937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6911556A FR2040832A5 (fr) 1969-04-15 1969-04-15

Publications (1)

Publication Number Publication Date
US3613937A true US3613937A (en) 1971-10-19

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ID=9032397

Family Applications (1)

Application Number Title Priority Date Filing Date
US28634A Expired - Lifetime US3613937A (en) 1969-04-15 1970-04-15 Floating roof hydrocarbon tank

Country Status (7)

Country Link
US (1) US3613937A (fr)
BE (1) BE749009A (fr)
DE (1) DE2018059A1 (fr)
FR (1) FR2040832A5 (fr)
GB (1) GB1277358A (fr)
LU (1) LU60731A1 (fr)
NL (1) NL7005445A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114425227A (zh) * 2021-12-15 2022-05-03 中国石油化工股份有限公司 一种燃料气分液设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US472488A (en) * 1892-04-05 Self-cleaning cistern
US1949981A (en) * 1930-09-19 1934-03-06 Harry A Stendrup Liquid transportation and storage apparatus
US2068048A (en) * 1935-06-28 1937-01-19 Adams Renard Paul Filter
US2282773A (en) * 1939-04-01 1942-05-12 John H Wiggins Seal for floating roofs
US3129173A (en) * 1960-08-01 1964-04-14 Hertha M Schulze Centrifugal type liquid-solid separator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US472488A (en) * 1892-04-05 Self-cleaning cistern
US1949981A (en) * 1930-09-19 1934-03-06 Harry A Stendrup Liquid transportation and storage apparatus
US2068048A (en) * 1935-06-28 1937-01-19 Adams Renard Paul Filter
US2282773A (en) * 1939-04-01 1942-05-12 John H Wiggins Seal for floating roofs
US3129173A (en) * 1960-08-01 1964-04-14 Hertha M Schulze Centrifugal type liquid-solid separator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114425227A (zh) * 2021-12-15 2022-05-03 中国石油化工股份有限公司 一种燃料气分液设备

Also Published As

Publication number Publication date
LU60731A1 (fr) 1970-06-15
DE2018059A1 (de) 1970-11-05
GB1277358A (en) 1972-06-14
BE749009A (fr) 1970-09-16
FR2040832A5 (fr) 1971-01-22
NL7005445A (fr) 1970-10-19

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