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Inner floating roof

Floating top cover floating on the liquid level of oil tank and rising and falling with oil products

The inner floating roof is floating on the Oil tank Floating top cover with oil level rising and falling. This kind of inner floating roof cover is recognized as the most ideal, economical and simple method to reduce oil evaporation loss. Under a specific environment, the statistics of relevant manufacturers show that the economic value of reducing oil and gas volatilization within 3-6 months due to the use of internal floating roof is equivalent to that of internal floating roof installation Purchase cost That is, the cost of internal floating roof can be recovered within half a year. It can be suitable for butt joint tanks and lap joint tanks of various sizes. It does not pollute oil products or chemicals, can reduce volatile loss of media, and prevent air pollution. It is an ideal internal floating roof (plate). It has the characteristics of low cost, short construction period, corrosion resistance, small volume and long service life.

Chinese name: Inner floating roof
Foreign name: Internal Floating Roof）

Substantive: Floating top cover rising and falling with oil
Category: Metal disc type inner floating roof

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Internal Floating Roof

brief introduction

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The inner floating roof has the following types:

a. Metal disk type inner floating roof, which is in contact with liquid and has a buoyancy effect Edge component , usually made of steel.

b. Metal compartment bulkhead type inner floating roof, which is an open edge compartment in contact with liquid and has buoyancy effect. The distribution of compartments shall meet the specified requirements, usually made of steel.

c. The metal floating boat type inner floating roof is a closed edge compartment that contacts with the liquid and has the function of buoyancy. The distribution of compartments shall meet the specified requirements, usually made of steel.

d. Metal double disk inner floating roof. In contact with the liquid, there are two continuous decks above and below, and between the decks there are compartments for buoyancy. Usually made of steel.

e. On Buoy Metal inner floating roof on the roof. The deck is not in full contact with the liquid above the liquid level, and is usually made of aluminum or stainless steel.

f. Sandwich Metal sandwich panel Inner floating roof. There are honeycomb compartments inside for buoyancy. The grating between honeycomb compartments does not need to be inspected according to the relevant inspection requirements and design buoyancy requirements of the compartment. Full contact with liquid, usually aluminum alloy.

g. Hybrid inner floating roof. Any combination of the above b~c types is generally adopted when both the buyer and the manufacturer agree. Closed edge compartment and open central compartment that are in contact with liquid and have buoyancy effect. Usually made of steel.

The inner floating roof is floating Oil tank Floating top cover with oil level rising and falling. This kind of inner floating roof cover is recognized as the most ideal, economical and simple method to reduce oil evaporation loss. Under a specific environment, the statistics of relevant manufacturers show that the economic value of reducing oil and gas volatilization within 3-6 months due to the use of internal floating roof is equivalent to that of internal floating roof installation Purchase cost That is, the cost of internal floating roof can be recovered within half a year.

It can be suitable for butt joint tanks and lap joint tanks of various sizes. It does not pollute oil products or chemicals, can reduce volatile loss of media, and prevent air pollution. It is an ideal internal floating roof (plate). It has the characteristics of low cost, short construction period, corrosion resistance, small volume and long service life.

Oil tank The purpose of adopting internal floating roof is to reduce volatilization loss during storage, save energy, reduce potential safety hazards and reduce environmental pollution.

For the reconstruction of old tanks, customers prefer to use aluminum alloy inner floating roof. The advantage is that there is no need to open holes on the tank body, and all parts are composed of 24 inch diameter Manhole Enter, and then assemble on site in the tank.

main features

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All internal floating roofs are designed with a specific gravity of 0.7 or lower (so that they can be used when storing any hydrocarbon), even if the specific gravity of the medium in actual use is greater than 0.7, so as to ensure sufficient buoyancy.

It can safely bear at least two people walking anywhere on the floating roof, whether floating or falling on the pillar, without causing Floating roof Damage or overflow of products stored in the tank onto the floating roof.

The buoyancy provided by the inner floating roof is designed to be twice of its fixed load (including the floating cabin, seal, all the floating roof accessories and their connected accessories), plus the friction used to offset the friction between the peripheral seal and the tank wall, and between the connecting pipe passing through the floating roof and its seal.

In case of steel floating roof, there are usually multiple floating tanks. Any two perforations enter the liquid storage, and the floating roof is guaranteed not to sink and cause other damage.

The design of inner floating roof shall conform to the domestic requirements SH3046-92 Or abroad API650-2007 Rev. 11 Standard requirements.

Edge seal

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The space between the inner floating roof and the tank wall must be sealed around.

When an inner floating roof uses two similar sealing devices, one above the other, the lower one is called the primary seal, and the upper one is called the secondary seal. When only one such device is installed, regardless of its installation position, it is called a primary seal.

The type and material of the seal is usually selected according to the reservoir fluid. The following issues shall be considered: the storage fluid to be installed and the storage fluid that may be modified in the future, the condition of tank wall, maintenance requirements, management requirements, service life, ambient temperature, design temperature Permeability Wear resistance, fading, aging, embrittlement, flammability and other relevant factors.

The peripheral seal and its accessories shall be designed to adapt to Floating roof The deviation of the gap size between the tank wall and the tank wall is usually designed according to the local deviation of ± 100 mm to fully ensure that there is no chuck during operation.

Seal type

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a. Liquid storage contact peripheral seal: elastic Foam plastic A primary seal for filling or liquid filling whose bottom is in contact with the reservoir. The sealing material may be elastic foam (such as Polyurethane foam ）Or fabric encapsulated liquid. The circumferential joints of such peripheral seals must be liquid tight, and the lap width is at least 75mm, and the thickness is usually more than 1mm.

b. Liquid vapor contact peripheral seal: it means that the installation position of the primary seal is not in contact with the liquid level of the reservoir. Such peripheral seals can include (but are not limited to), elastic foam plastic seals (similar to the design of a); Mechanical secondary seal (similar to the design of article c); Elastic wiper seal. Elastic oil scraper seal refers to the peripheral seal of the shovel made of elastic materials (extruded rubber, synthetic rubber), with or without cloth or mesh materials for reinforcement.

c. Mechanical secondary seal: refers to the use of light sealing plate to contact with the tank wall and slide on the tank wall. The space between the light sealing plate and the edge of the floating roof is sealed with fabric. The sealing plate is usually a series of plates lapped or connected together to form an annular pressure, which is pressed on the tank wall through a mechanical device. Galvanized sheet Smallest of slices Nominal thickness It is 1.5 mm Stainless steel plate The minimum nominal thickness of the sheet is 1.2 mm. The plate shall be at least 150mm above the liquid level and 100mm below the liquid level to ensure the sealing effect.

Scope of application

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1. Working pressure: atmospheric storage tank or nitrogen sealed storage tank

2. Operating temperature: - 30 ℃~150 ℃

3. Medium: various oil products. Such as naphtha, (bio) gasoline and diesel, kerosene crude oil , fuel oil heavy oil , benzene, xylene, methanol, ethanol

6、 Fixed roof oil tank with or without inner floating roof oil products Evaporation loss Comparison table:

Oil tank volume	Oil tank diameter	Oil tank height	Annual turnover second number	Fixed roof oil tank Oil evaporation loss	aluminum Floating roof oil tank Oil evaporation loss	Fuel saving	section oil effect rate
cubic metre	rice	rice	second	Kg/year	Kg/year	Kg/year	%
one thousand	eleven	ten	ten	thirty thousand and forty-six	two thousand one hundred and sixty-seven	twenty-seven thousand eight hundred and seventy-nine	ninety-two point eight
-			twenty	forty-three thousand two hundred and fifty-four	two thousand two hundred and forty-nine	forty-one thousand and five	ninety-four point eight
-			thirty-six	sixty-two thousand and forty-eight	two thousand three hundred and seventy-nine	fifty-nine thousand six hundred and sixty-nine	ninety-six point two
two thousand	fourteen point five	twelve	ten	fifty-four thousand nine hundred and fifty-five	three thousand one hundred and eighty-nine	fifty-one thousand seven hundred and sixty-six	ninety-four point two
-			twenty	seventy-nine thousand five hundred and seventy-two	three thousand three hundred and fifteen	seventy-six thousand two hundred and fifty-seven	ninety-five point eight
-			thirty-six	one hundred and eighteen thousand nine hundred and fifty-eight	three thousand five hundred and sixteen	one hundred and fifteen thousand four hundred and forty-two	ninety-seven
five thousand	twenty-one	fourteen	ten	one hundred and twenty-nine thousand two hundred and ninety	six thousand two hundred and eighty-seven	one hundred and twenty-three thousand and three	ninety-five point one
-			twenty	one hundred and ninety thousand eight hundred and thirty-two	six thousand four hundred and eighty-six	one hundred and eighty-four thousand three hundred and forty-six	ninety-six point six
-			thirty-six	two hundred and eighty-nine thousand two hundred and ninety-seven	six thousand eight hundred and five	two hundred and eighty-two thousand four hundred and ninety-two	ninety-seven point six
ten thousand	thirty	fourteen	ten	two hundred and forty thousand three hundred and thirty-four	nine thousand four hundred and twenty-two	two hundred and thirty thousand nine hundred and twelve	ninety-six point one
-			twenty	three hundred and sixty-three thousand four hundred and seventeen	nine thousand seven hundred and twenty-seven	three hundred and fifty-three thousand six hundred and ninety	ninety-seven point three
-			thirty-six	five hundred and sixty thousand three hundred and forty-nine	ten thousand two hundred and fourteen	five hundred and fifty thousand one hundred and thirty-five	ninety-eight point two

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