JPH06211292A - Floating-roof waterproof and heat-insulating method of floating-roof type tank - Google Patents

Abstract

PURPOSE:To apply a heat insulating material by a simple method to a deck plate constituting the floating roof of a floating roof-type tank. CONSTITUTION:The frame members 4 of a heat insulating material having fire resistance and flexibility but no water absorption properties are bonded by adhesive to a deck plate 1 constituting the floating roof of a floating roof- type tank, phenol-modified urethane foam raw material is sprayed on the inside of the deck plate partitioned by the frame members 4 so that a heat insulating barrier 7 is formed, and butyl rubber moistureproof paint and chlorosulfonated polyethylene rubber moistureproof paint are successively sprayed upon the barrier 7 so that a waterproof and fireproof film 8 is formed. Thus, the adiabatic application to the deck plate, which is easily deformed in the manner of undulating by wind pressure, etc., is performed with ease. Also, when the phenol- deformed urethane foam raw material is used, the raw material indicates a weak alkalinity at the time of coming into contact with water so that there is no possibility of accelerating the corrosion of the deck plate. Further, when the three spraying materials are colored differently, the insufficiency of thickness at the time of application can be confirmed visually.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating roof heat insulating construction method for a floating roof tank used for storing heavy oil, crude oil and the like.

[0002]

2. Description of the Related Art Generally, in a storage tank for heavy oil, crude oil or the like having a high viscosity at room temperature, the oil storage temperature is maintained at 50 to 60 ° C. in order to ensure the fluidity of the oil storage. Therefore, it is necessary to install a heat insulating material on the tank from the viewpoint of energy saving. However, many tanks for storage of heavy oil, crude oil, etc. are of floating roof type, and most of them are of single deck type.

FIG. 4 schematically shows the structure of a storage tank having a single-deck floating roof. In the figure, T is a tank, B is a circular floating roof, 1 is a steel deck plate constituting the floating roof, 2 is a pontoon, and 3 is a sealing member. Since the deck plate of the single-deck floating roof is made of steel plate with a thickness of about 4.5 mm, it easily undulates and deforms due to wind pressure and walking of inspection workers. It is difficult to apply the heat insulating material, and many of the deck plates of existing single deck tanks do not have the heat insulating material.

[0004]

In the single-deck tank, however, heat dissipation from the deck plate accounts for about 60% of the total, so that the deck plate has been insulated. It is desired to develop a simple floating roof waterproof insulation method.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and is a floating roof tank floating roof capable of forming a uniform waterproof heat insulating layer very easily on site. Its main purpose is to provide a waterproof insulation method.

[0006]

According to the present invention, there is provided a method for waterproofing and insulating a floating roof of a floating roof tank, wherein the deck plate constituting the floating roof is fireproof and flexible and has no water absorption. A frame member made of a material is bonded with an adhesive, and the phenol-modified urethane foam raw material, butyl rubber-based moisture-proof paint, and chlorosulfonated polyethylene rubber-based moisture-proof paint are sequentially sprayed onto the deck plate surface partitioned by the frame member. It is a summary.

The frame member used in the present invention contains, for example, a fire resistant powder such as aluminum hydroxide, calcium carbonate or the like as a main component, an organic binder and a foaming agent, and is made to foam. A heat insulating material which has flexibility and whose cells mainly consist of closed cells and does not absorb water is mentioned.

The phenol-modified urethane foam raw material used in the present invention includes, for example, a mixture of 30% by weight of a phenol resin, 50% by weight of an isocyanate and 14% by weight of a blowing agent.

[0009]

According to the above waterproof insulation method, first, a phenol-modified urethane foam raw material is sprayed to form a heat-insulating layer of a required thickness, butyl rubber-based moisture-proof paint is sprayed on the surface, and chlorosulfonated polyethylene rubber-based moisture-proof coating is further applied. By spraying the paint, a waterproof / fireproof coating layer having weather resistance, flexibility, water resistance, and moisture permeability is formed.

[0010]

1 to 3 show an example in which the present invention is applied to a single-deck type floating roof. In the figure, 1 is a deck plate, 1a is a steel plate constituting the deck plate, 1b
Is a weld. The deck plate 1 is previously coated with anticorrosive paint.

In order to apply the waterproof heat insulating material to the deck plate 1, first, the deck plate portion excluding the welded portion 1b and its peripheral portion is placed so as to be partitioned by the frame member 4 and fixed by an adhesive. In this embodiment, the frame member 4 has a refractory and flexible, water-absorptive triangular cross-section, which is made of a refractory powder as a main component, an organic binder and a foaming agent added to foam. It uses the heat insulating material.

Before applying the waterproof heat insulating material on the deck plate divided by the frame member 4, as shown in FIG. 2, the welded portion 1b and its peripheral portion are covered with a sheet member 5 such as a polyethylene sheet. A tape 6 with an adhesive is attached from the surface of the frame member 1b on the side of the welded portion to the sheet member 5 so as to prevent the next spray heat insulating material from adhering.

Next, a phenol-modified urethane foam material is sprayed on the deck plate divided by the frame member 4 to form a heat insulating layer 7. After spraying the phenol-modified urethane foam material, the sheet member 5 is removed, and a butyl rubber-based moisture-proof coating and a chlorosulfonated polyethylene rubber-based moisture-proof finish coating are sequentially sprayed on this portion and the surface of the heat insulating layer 7 for waterproofing. The fireproof coating 8 is formed.

When the heat-insulating layer 7 is formed by spraying the phenol-modified urethane foam material, the heat-insulating layer 7 is sprayed. Therefore, as shown in FIG. In such cases, butyl rubber-based moisture-proof paint and chlorosulfonated polyethylene rubber-based moisture-proof paint are likely to cause partial thickness loss when spraying, but since the phenol-modified urethane foam material is white to pale yellow, for example, butyl rubber The color of the system paint is black or gray, and the color of the chlorosulfonated polyethylene rubber paint is not white, and layers of different colors are layered on top of each other to eliminate areas where the thickness is insufficient during spraying. It can be checked visually and repaired before installation.

[0015]

As described above, according to the floating roof waterproof insulation method of the present invention, the following effects can be obtained. (1) Since the heat insulation layer is formed on the deck plate by spraying, heat insulation can be easily performed on the deck plate that is easily undulated by wind pressure or the like. (2) Conventionally, urethane foam has been mentioned as a typical heat insulating material of the type that is foamed in situ by spraying, but this urethane foam exhibits acidity (pH = 3 to 4) when it comes into contact with water. When used for thermal insulation of floating roofs of tanks that are often exposed to rainwater, it may promote corrosion of deck plates made of steel, whereas phenol-modified urethane foam used in the present invention is It shows weak alkalinity (pH about 8) when it comes into contact, and there is no fear of promoting corrosion of the deck plate. Also, the heat resistance of the urethane foam is improved. (3) Phenol-modified urethane foam, butyl rubber-based moisture-proof paint, and chlorosulfonated polyethylene-based moisture-proof paint are colored in different colors.
The lack of thickness during construction can be visually confirmed,
There will be no defective construction due to insufficient thickness.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is a perspective view of a heat insulating portion showing a state where heat insulation is applied to a deck plate of a floating roof.

FIG. 2 is a perspective view showing a portion of a deck plate on which heat insulation is not applied.

FIG. 3 is a cross-sectional view showing a defective portion of the waterproof / fireproof coating on the surface of the heat insulating layer.

FIG. 4 is a schematic configuration diagram of a tank having a single-deck floating roof.

[Explanation of symbols]

 T Tank B Floating roof 1 Deck plate 1a Steel plate 1b Welded part 2 Pontoon 3 Seal member 4 Frame member 5 Sheet member 6 Adhesive tape 7 Insulation layer 8 Waterproof / fireproof coating

Claims (2)

[Claims] 1. A frame member made of a heat insulating material having fire resistance and flexibility and having no water absorption is adhered to a deck plate constituting a floating roof of a floating roof tank with an adhesive, and the frame member A floating roof waterproof insulation method for floating roof tanks, which is characterized by sequentially spraying phenol-modified urethane foam raw material, butyl rubber-based moisture-proof paint, and chlorosulfonated polyethylene rubber-based moisture-proof paint on the partitioned deck plate surfaces. 2. The floating roof for a floating tank according to claim 1, wherein the phenol-modified urethane foam raw material, the butyl rubber moisture-proof coating, and the chlorosulfonated polyethylene rubber moisture-proof coating are used in different colors. Waterproof insulation construction method.