SU1763324A1 - Method of preparing reservoir for storage of readily volatile fluids equipped with - Google Patents

Abstract

The invention relates to the transport and storage of liquids with high elasticity TiajfoB and can be used in the storage of gasolines, oils and other easily evaporating liquids in vertical cylindrical tanks 6 with floating roofs or pontoons. The purpose of the invention is to improve the operational reliability of the tank and reduce costs. In the process of preparing the tank operation, the installation of a floating roof or pontoon is carried out directly on the bottom of the tank, covered with an anti-adhesive film 2 or more.

Description

The invention relates to the field of transport and storage of liquids with high vapor pressure and can be used in the storage of gasolines, oils and other highly volatile liquids in vertical cylindrical tanks with floating lids or pontoons.

The closest analogue of the proposed method is a method of preparing for operation tanks with pontoons made of polyurethane foam. In this case, the installation and formation of pontoons are carried out on horizontal decks located on the installation and maintenance supports, and after the installation of the pontoons is completed, the floorings and installation supports are removed from tanks. As a prototype, a method of preparing for operation a tank with a pontoon for storing an easily evaporating liquid and a tank with a pontoon for storing a easily evaporating liquid is taken (application No. 471T4242 / 27-13 (083048) dated 16.06.80. 12/15/89).

In the prototype, the installation of the pontoon is made on a horizontal floor, located on the mounting support at a level not lower than 1800 mm from the bottom of the tank, above the receiving-distributing devices, and after fixing the pontoon on the support posts, the flooring and mounting support are removed from the tank. The pontoon is then installed in the lower working position by filling the reservoir with liquid until the pontoon emerges and the subsequent release of the support pillars from fastening. After that, the fluid is drained until the pontoon reaches the level of its placement over the receiving-dispensing devices and the subsequent fixing of the supporting pillars.

The disadvantages of the prototype are the need to use horizontal flooring and installation support. A large amount of deficient wood and

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metal rolling, labor costs for their manufacture, installation, dismantling and transportation are great, In addition, the need to use this cumbersome tooling hinders the one-time work at various sites in different regions.

Due to the insufficient rigidity of the flooring and the mounting support, the possibilities of improving the quality of manufacturing a floating roof and, accordingly, the reliability of its operation are not fully utilized.

The aim of the invention is to increase the operational reliability and reduce the cost of preparing a floating roof tank or pontoon for operation.

The goal is achieved through the following. The installation and formation of a floating roof or pontoon is made on the bottom of the tank, covered with an anti-adhesive film (and not on the floor located on the installation support, as in the prototype) before mounting the pick-up devices (and not after their installation, as in the prototype).

The support legs are then inserted loosely into the bushings installed in the floating roof or pontoon. The support legs are not fastened with clamping devices so that they remain pressed against the bottom of the tank under the action of gravity during the subsequent ascent of the floating roof. Then, under the floating roof, a pipe, lowered through an elastic shutter, flows into the bottom of the tank into the gap between the rigid part of the floating roof and the tank wall until the floating roof reaches the level corresponding to the upper mounting position (usually this position is at a distance of approximately 1800 mm from the bottom of the tank for the convenience of working under a floating roof).

After that, the support legs are fixed in the sleeves with clamping devices, and the liquid is completely pumped out of the reservoir. In a manner taKHM, the floating roof (pontoon) is detached from the support posts. This allows, in contrast to the prototype, to do without flooring and mounting support.

After that, the installation of the receiving-distributing and other devices in the lower part of the tank is carried out, the lower surfaces of the floating roof (pontoon) are coated with an electrically conductive coating.

The lowering of the floating roof (pontoon) to the lower working position is carried out in a known manner.

The method is illustrated in FIG. 1 and 2.

Figure 1 shows a floating roof tank 1 2 in the lower operating position with support posts 3 in sleeves 4 equipped with clamping devices 5. Additionally, the lower A and upper B of the floating roof 2 are also conventionally shown. dispensers b and manholes 7 mounted on the wall 8 of the tank, as well as guides

9. mounted on the bottom 10 of the reservoir 1. Figure 2 shows the peripheral part of the floating roof 2 in the lower mounting position A, where the peripheral ring 11 is shown in section, with a fixed on

gate 12 and part of the carpet 13 floating roof 2 with reinforcing elements 14 and 15, as well as the pipe 16 for the supply of fluid.

An example implementation of the method on a tank with a capacity of 5000 m3 TP 704-1- 186.96.

1, Initial state of tank 1 prior to installation and the formation of a floating roof 2.

1.1. Dispensers 6 are not yet mounted.

1.2.Mounted guides 9

1.3. The manholes 7 were installed. Moreover, the manhole in the first through tank (the lower manhole) has the same design as the manhole in the third tank (upper manhole), to ensure normal installation and subsequent movement of the floating roof shutter

along the tank wall.

2. The main technological operations of preparation of tank 1 for operation.

2.1.Protection of the bottom of tank 10 with plastic wrap.

(the film is not shown in the drawing).

2.2. Installation and formation of a floating roof 2 is performed, in the sequence:

a) mounting the peripheral ring 11; b) placement of the sleeves 4;

C) primary (thin layer) fastening of the peripheral ring 11 and the sleeves 4;

g) laying the lower layer of reinforcing elements 15 over the entire area of the carpet 13, and

also elements 14;

d) applying a middle layer of polyurethane foam carpet 13;

e) laying the upper layer of reinforcing elements 15;

g) applying the top layer of polyurethane foam, mounting the shutter 12 on the peripheral ring 11;

h) installation of the pipe 16;

i) mounting the support posts 3 into the sleeve 4 without fixing it with the clamping devices 5;

k) supplying fluid under the floating roof 2 through the nozzle 16 to occupy the upper mounting position B by it (as the floating roof 2 is raised, the support legs 3 freely pass through the sleeve 4 and remain stationary under the force of gravity against the bottom 10 of the tank 1J:

e) securing the support posts 3 with the clamping devices 5 in the upper mounting position B of the floating roof 2;

m) complete pumping of fluid from reservoir 1 using nozzle 16, which also acts as a siphon in the final stage of pumping;

m) installation of the receiving and distributing device 6;

c) applying an electrically conductive coating to the bottom surface of the floating roof 2;

p) the flow of fluid into the tank under the floating roof 2 of the fluid to its ascent;

p) detachment of support columns 3;

c) pumping fluid from reservoir 1 to occupy the floating roof 2 of the lower operating position (when lowering the floating roof 2, the support posts 3, resting on the bottom 10, freely pass through the bushes 4);

t) securing the supporting posts with clamping devices 5 when placing the floating roof in the lower operating position;

s) full pumping of fluid from reservoir 1.

The tank is ready for operation.

The implementation of the proposed method makes it possible to eliminate the cost of manufacturing mounting accessories for each tank size, i.e.

mounting supports and decking, at the cost of installing this equipment in tanks, its dismantling, maintenance costs for maintaining the equipment in normal

condition, as well as the periodic updating of equipment as it wears out, reduce transportation costs and storage costs of equipment in warehouses, increase efficiency and

the productivity of equipping a tank farm designed to store highly evaporating liquids by means of reducing evaporation losses and protecting the environment from

pollution, improve the quality of work on the manufacture of floating roofs and pontoons in tanks, and hence the reliability of operation of tanks,

Claims (1)

Invention Formula A method of preparing for the operation of a storage tank for easily evaporating liquids equipped with a floating roof or pontoon with support columns, including installation of the housing, a receiving-distributing device, installation of a floating roof or pontoon with subsequent installation of the floating roof or pontoon to the working position by lifting and lowering together with the level of the liquid and fixing the support columns, characterized in that, in order to increase the operational reliability of the tank and reduce costs, before installation the receiving-distributing device mounting the floating roof or pontoon is led to the bottom of the tank covered with an anti-adhesive film; in the process of installing the floating roof or pontoon to the mounting position, the supply or emptying of the liquid is carried out by means of a pipe located in the gap between the wall of the tank body and the floating roof or pontoon., and after fixing the support posts pump out the liquid and install a pick-up device and then cover the bottom surfaces of the floating roof or pontoon with an electrically conductive coating. FIG.