NL2026963B1 - A method of preparing a floating roof for a storage tank - Google Patents

A method of preparing a floating roof for a storage tank Download PDF

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Publication number
NL2026963B1
NL2026963B1 NL2026963A NL2026963A NL2026963B1 NL 2026963 B1 NL2026963 B1 NL 2026963B1 NL 2026963 A NL2026963 A NL 2026963A NL 2026963 A NL2026963 A NL 2026963A NL 2026963 B1 NL2026963 B1 NL 2026963B1
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NL
Netherlands
Prior art keywords
floating roof
liquid layer
floating
aqueous
fibers
Prior art date
Application number
NL2026963A
Other languages
Dutch (nl)
Inventor
Faber Alexander
Original Assignee
Ct Platon B V
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ct Platon B V filed Critical Ct Platon B V
Priority to NL2026963A priority Critical patent/NL2026963B1/en
Application granted granted Critical
Publication of NL2026963B1 publication Critical patent/NL2026963B1/en

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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
    • B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
    • B65D88/40—Large containers having floating covers, e.g. floating roofs or blankets with support for aground cover
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00586—Roofing materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

A floating roof of a storage tank, such as for petrochemical products, comprises a tank shell comprising an upright wall extending from a bottom; and floating roof. A floating roof comprises — a floating roof member with a top side and a bottom side — a circumferential rim extending upward. To make the floating roof more effective as a fire barrier, the top of the floating member is provided with a liquid layer, said liquid layer comprising i) an aqueous inorganic mass capable of setting and ii) fibers, wherein said liquid layer is left to set.

Description

A method of preparing a floating roof for a storage tank The present invention relates to a method of manufacturing a floating roof of a storage tank, said storage tank comprising ~ a bottom, — a tank shell comprising an upright wall extending from said bottom; and — a floating roof, said floating roof comprising ~ a floating roof member with a top side and a bottom side ~ a circumferential rim extending upward.
Storage tanks with floating roofs are widely used, in particular for storing liquid flammable products, such as liquid petroleum products (oil, gasoline etc).
These storage tanks can be very big, and their content in use quite flammable, for which reason stringent precautions have to be taken to reduce the risk of the content catching fire. Thus it is known to provide a floating roof made using a flame-retardant material. The cover has to meet a large number of requirements to meet safety requirements. The floating roof being very big, it is subject to movement caused by, for example, changing ambient temperatures, changing level of content, maintenance below the floating cover where the cover rests on props (adjustable legs). Thus the floating roof may deteriorate, rendering it less effective as a barrier in case of fire.
It is an object of the present application to provide a method according to the preamble in which at least one of these problems is reduced.
To this end, a method according to the preamble is characterized in that the top of the floating member is provided with a liquid layer, said liguid layer comprising 1) an aqueous inorganic mass capable of setting and ii) fibers, wherein said liquid layer is left to set.
Thus a roof is provided having a fiber-reinforced solid layer capable of withstanding a fire on the roof better than a conventional flame-retardant roof. The floating roof member may be a floating roof member made using flame-retardant material as a further precautionary measure in case of fire.
The length of the fibers will typically be more than 3 mm, such as more than 5 mm. Very long fibers are possible but a practical length is less than 10 cm, such as less than 5 cm.
The inorganic mass is for example a cement.
According to a favourable embodiment, the mixture is applied to a floating roof member comprising at its top a layer of a resilient solid foam.
The resilient foam allows for compensation of differences in movement, for example caused by temperature variations, thus improving the adherence of the set layer to the floating roof member without increasing the risk of crack formation that could enhance the fire risk.
According to a favourable embodiment, the solid foam is a resilient foam.
This has been found to provide improved adherence of the solid layer to the roof. The foam is advantageously PET foam.
According to a favourable embodiment, the fibers are glass fibers.
These are long-lasting and incombustible.
According to a favourable embodiment, the fibers are sprayed together with the liquid mixture onto the top of the roof.
Thus it can be assured that after setting a roof cover is provided that is likely to retain its integrity over its life span.
According to a favourable embodiment, the agueous inorganic mass is a mixture prepared from a set of components comprising the following components A and B: A) a first agueous composition comprising a solution of an inorganic phosphate-comprising salt, said first agueocus composition having a pH at 20°C of from 1.0 to 6.5, and B) a second agueous composition comprising at least one dissolved compound chosen from an alkaline oxide, an earth alkaline oxide, an alkaline hydroxide and an earth alkaline hydroxide, wherein the second aqueous composition has a pH at 20°C of from 7.5 to 14.0.
The resulting agueous inorganic mass is freshly prepared, as it will start setting upon mixing. The concentrations, mixing ratio and kations are chosen such that the mixing results in the formation of a 3% precipitate.
The term phosphate-comprising comprises phosphate, hydrogen phosphate and dihydrogen phosphate.
According to a favourable embodiment, the aqueous inorganic mass is formed by mixing an alkaline aqueous solution of magnesium oxide with an acidic solution of mono potassium phosphate in a stoichiometric ratio of the active ingredients. This provides a durable and excellent barrier in case of fire.
According to a favourable embodiment, the liguid layer has an initial water content from 10 to 60 % by weight, preferably from 15 to 50% by weight.
This results in the formation of a durable solid layer. The present invention will now be illustrated with reference to the drawing where Figs 1A to Fig. 1G demonstrate the method for preparing a roof for a sto rage tank.
Fig 1: A storage tank 150 comprises a storage tank bottom 151 and storage tank wall 152, A mold 190 is built by providing a raised wooden floor 191, held by poles 199. More specifically, and as known in the art, a support structure is prepared using DOKA beams (Doka drager H20 top N, Doka drager HZ0 eco N, DOKA Nederland, Oss, The Netherlands), which are covered with sheets of melamine coated plywood. Seams between sheets of plywood are sealed with polypropylene tape. The mold 190 comprises an upright wall 192 extending from the wooden floor 191, said upright wall 192 is also comprised of plywood coated with melamine.
Fig. 1B: A layer 110 of vinyl-epoxyresin is applied to the mold 190 using a spray gun 195, said spray gun being connected to a storage vessel 196 for vinyl-epoxy and a storage vessel 197 for hardener by spraying. The vinyl-epoxyresin may contain an additive to reduce static charge so as to reduce the risk of fire.
Fig. 1C: The layer 110 is then covered with a non-woven glass fiber sheet (not shown) available on rolls and covered with several layers 120 of vinyl-epoxy which is sprayed onto the previous layer 110, 120 together with glass fibers having a length of less than 3 om up to a final thickness of 3 to 5 mm. A suitable spray device 195 for applying glass fibers with resin is available from (CT Platon, Werkendam, The Netherlands).
The non-woven glass fiber sheet of the first layer 110 serves as a barrier for glass fibers of the subsequent layers 120 that might jeopardize the structural integrity of the vinyl-epoxy layer 110, and increasing the risk of damage of the laminate by stored liguid entering along the glass fibres.
The ratio of glass fiber : (resin + glass fiber) is typically between 25% and 35 % by weight glass fiber relative to the weight of the resin+ glass fiber.
Fig. 1D: Applying PET foam panels 130 on the previous layers 120 (but not against the wall 192) for forming the core of a sandwich (thickness 50-100 mm; density 70 g/l).
Fig. 15: Spraying several layers 140 of vinyl-epoxy resin containing glass fibers (length typically less than 3 cm) onto the PET foam layer 130 and against the layers 120 on the wall 192 until the desired thickness is achieved (typically 3 - 5 mm), so as to result in a floating roof member 102 as a sandwich structure.
The above mentioned operations performed to manufacture such a floating roof member 102 are standard practice for the person skilled in the art.
Fig. 1F: Forming a second layer 155 of PET foam by glueing with isophtalic acid unsaturated polyester resin (Romar Voss, The Netherlands) resilient PET foam panels (density 70 g/l) having a thickness of about 5 mm to the previous vinyl-epoxy layer to provide a base 150 for a fireproof top layer. Instead of PET foam balsa wood may be used.
Fig. 1G: Using the same spray technique and spray device as used above, applying a layer of liquid cement together with glass fibers (length typically less than 3 cm) with a thickness of 3 mm and allowing it to set, so as to result in the floating roof 100 with a layer 160 of inorganic material covering the floating roof member 102 and comprises a rim 105.
The liquid cement is formed by mixing a concentrated alkaline aqueous solution of magnesium oxide with a concentrated acidic solution of mono potassium phosphate in a stoichiometric ratio of the active ingredients.
The ratio of glass fiber/liquid cement is typically between 10% and 15 % by weight per volume of cement.
Fig. 1H: Finally, the mold 190 is removed. The roof 100 will rest 3% on legs (not shown) attached to either the floating roof 100 or welded to the tank bottom, as is known in the art.

Claims (8)

-5- NL2026963 Conclusies-5- NL2026963 Conclusions 1. Werkwijze van het vervaardigen van een drijvend dak van een opslagtank, waarbij de opslagtank het volgende omvat: - een bodem, - een tankomhulsel dat een opstaande wand omvat die zich vanaf de bodem uitstrekt; en - een drijvend dak, waarbij het drijvende dak het volgende omvat: - een drijvend dakelement met een bovenzijde en een onderzijde - een omtreksrand die zich naar boven uitstrekt; met het kenmerk, dat de bovenkant van het drijvende element voorzien wordt van een vloeibare laag, waarbij de vloeibare laag 1) een waterige anorganische massa die in staat is uit te harden en ii) vezels omvat, waarbij de vloeibare laag gelaten wordt om uit te harden.A method of manufacturing a floating roof of a storage tank, the storage tank comprising: - a bottom, - a tank shell comprising an upright wall extending from the bottom; and - a floating roof, the floating roof comprising: - a floating roof element with a top and a bottom - a peripheral edge extending upwards; characterized in that the top of the floating element is provided with a liquid layer, the liquid layer comprising 1) an aqueous inorganic mass capable of curing and ii) fibers, the liquid layer being left to expand harden. 2. Werkwijze volgens conclusie 1, waarbij het mengsel aangebracht wordt op een drijvend dakelement dat op de bovenkant ervan een laag van een veerkrachtig vast schuim omvat.A method according to claim 1, wherein the mixture is applied to a floating roof element which comprises a layer of a resilient solid foam on its top. 3. Werkwijze volgens conclusie 1 of 2, waarbij het vaste schuim een veerkrachtig schuim 1s.A method according to claim 1 or 2, wherein the solid foam is a resilient foam. 4. Werkwijze volgens een van de voorgaande conclusies, waarbij de vezels glasvezels zijn.A method according to any one of the preceding claims, wherein the fibers are glass fibres. 5. Werkwijze volgens een van de voorgaande conclusies, waarbij de vezels samen met het vloeibare mengsel op de bovenkant van het dak gesproeid worden.A method according to any one of the preceding claims, wherein the fibers are sprayed onto the top of the roof together with the liquid mixture. 6. Werkwijze volgens een van de voorgaande conclusies, waarbij de waterige anorganische massa een mengsel is dat bereid is uit een verzameling componenten die de volgende componenten A en B omvatten: A) een eerste waterige samenstelling die een oplossing van een anorganisch fosfaatomvattend zout omvat, waarbij de eerste waterige oplossing bij 20°C een pH vanA method according to any one of the preceding claims, wherein the aqueous inorganic mass is a mixture prepared from a collection of components comprising the following components A and B: A) a first aqueous composition comprising a solution of an inorganic phosphate-comprising salt, where the first aqueous solution at 20°C has a pH of -6- NL2026963 1,0 tot 6,5 heeft, en B) een tweede waterige samenstelling die ten minste één opgeloste verbinding omvat die gekozen is uit een alkalioxide, een aardalkalioxide, een alkalihydroxide en een aardalkalihydroxide, waarbij de tweede waterige oplossing bij 20°C een pH van 7,5 tot 14,0 heeft.NL2026963 has 1.0 to 6.5, and B) a second aqueous composition comprising at least one dissolved compound selected from an alkali oxide, an alkaline earth oxide, an alkali hydroxide and an alkaline earth hydroxide, the second aqueous solution at 20 °C has a pH of 7.5 to 14.0. 7. Mengsel volgens conclusie 6, waarbij de waterige anorganische massa gevormd wordt middels het mengen van een basische waterige oplossing van magnesiumoxide met een zure oplossing van monokaliumfosfaat in een stoichiometrische verhouding van de actieve ingrediënten.A mixture according to claim 6, wherein the aqueous inorganic mass is formed by mixing a basic aqueous solution of magnesium oxide with an acidic solution of monopotassium phosphate in a stoichiometric ratio of the active ingredients. 8. Werkwijze volgens een van de voorgaande conclusies, waarbij de vloeibare laag een initieel watergehalte van 10 — 60 gewichts-%o, bij voorkeur van 15 — 50 gewichts-% heeft.A method according to any one of the preceding claims, wherein the liquid layer has an initial water content of 10-60% by weight, preferably 15-50% by weight.
NL2026963A 2020-11-24 2020-11-24 A method of preparing a floating roof for a storage tank NL2026963B1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189058A (en) * 1978-03-13 1980-02-19 The Dow Chemical Company Floating thermally insulating tank covers
EP0822896B1 (en) * 1995-04-26 2001-10-24 Atévic, Tomislav Laminated structure with improved fire resistance and procedure for the manufacture of the structure
US20060201392A1 (en) * 2005-03-08 2006-09-14 Matthew Piazza Lightweight cementitious mixture
US10000663B1 (en) * 2012-05-28 2018-06-19 L-M-J Nation Security Llc Protective flowable or spreadable composition, articles of manufacture, an apparatus for manufacture and a process for manufacture thereof
CN108584182A (en) * 2018-06-15 2018-09-28 广州市双时复合材料有限公司 Floating plate and preparation method thereof in a kind of sandwich fiberglass for oil storage tank
CN110077731B (en) * 2019-04-28 2020-06-02 沃德林科环保设备（北京）有限公司 Construction method for manufacturing glass fiber reinforced plastic floating plate by spraying process

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189058A (en) * 1978-03-13 1980-02-19 The Dow Chemical Company Floating thermally insulating tank covers
EP0822896B1 (en) * 1995-04-26 2001-10-24 Atévic, Tomislav Laminated structure with improved fire resistance and procedure for the manufacture of the structure
US20060201392A1 (en) * 2005-03-08 2006-09-14 Matthew Piazza Lightweight cementitious mixture
US10000663B1 (en) * 2012-05-28 2018-06-19 L-M-J Nation Security Llc Protective flowable or spreadable composition, articles of manufacture, an apparatus for manufacture and a process for manufacture thereof
CN108584182A (en) * 2018-06-15 2018-09-28 广州市双时复合材料有限公司 Floating plate and preparation method thereof in a kind of sandwich fiberglass for oil storage tank
CN110077731B (en) * 2019-04-28 2020-06-02 沃德林科环保设备（北京）有限公司 Construction method for manufacturing glass fiber reinforced plastic floating plate by spraying process

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