RU2517945C2 - Heat insulation method for shutoff and control valves of small diameters - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention refers to heat insulation of main and process oil pipelines and oil product pipelines, namely, to the method of heat insulation of shutoff and control valves (SCV) of small diameters. Heat insulation method for SCV of small diameters involves design and manufacturing of heat insulation from foam glass with a protective cover individually for each valve type taking into account the geometric dimensions and peculiarities of their design; the heat insulation comprises two or more parts connected by fastening elements which provide for the access for maintenance and repair of the valves; the heat insulation seams are sealed by sealing gaskets from foamed rubber and the inner surface of the heat insulation layer contacting with the valves is coated with antiabrasive material to protect its anticorrosion coating.

EFFECT: creation of fire safe heat insulation for shutoff and control valves of small diameters which is protected against external forces and provides for the valves' maintenance and repair.

1 tbl, 1 dwg

Description

The invention relates to thermal insulation of trunk and process pipelines and oil pipelines, and in particular to a method of thermal insulation of shut-off and control valves (ZRA) of small diameters.

Known inventions for heat-insulating structures, also containing methods of its application.

The invention is known "Thermal insulation design" (see patent RU No. 40433 U8 of 09/10/2004, IPC F16L 59/00), in which the thermal insulation structure is made collapsible, including removable shells fastened with bandages. The segments are combined in a structure that forms a heat-insulating shell around the pipeline and consists of N sectors, interconnected in a diametrical direction into a lock. The bandages are made in the form of tightening tapes secured by a lingering device equipped with a stopper.

The disadvantage of the method of application of this design is the lack of quick-detachable segments and, accordingly, in the absence of convenient access to the valve for its maintenance and repair.

The invention is known "Quick-detachable thermal insulation" (see patent RU No. 2259510 C1 dated 08.27.2005, F16L 59/10), which presents a quick-detachable thermal insulation, which is a set of frame elements installed on the tie braces along the insulating surface and repeating its profile , each of which contains a protective metal shell, a heat-insulating layer and fastening means.

The disadvantage of the method of applying this design also lies in the absence of quick-detachable block elements and, accordingly, in the absence of convenient access to the valve for its maintenance and repair.

Closest to the proposed technical solution is the installation method of thermal insulation of small-diameter ZRA, given in the Aeroflex Installation Manual (developed by Alfa-Invest Management Company LLC, 2010, 20 pp., Www.aeroflex-russia.ru). For example, the thermal insulation technology of valves includes operations to measure the external diameters of the pipe, flanges and the valve itself, applying measured dimensions to Aeroflex sheet or roll material, cutting out the insulation elements from Aeroflex material, isolating the valve using Aerotape insulation tape, applying glue to the bonded surfaces of the thermal insulation elements and their gluing together.

However, this method is not applicable in the field, including difficult climatic conditions (technologically complicated and time-consuming), does not protect the equipment from external influences and does not provide access to the protected equipment for its maintenance and repair.

The objective of the method is to ensure the protection of valves from external influences, the installation of thermal insulation of shut-off and control valves of small diameters using fireproof materials while providing access for its maintenance and repair.

The technical result that can be obtained by implementing the present method is expressed in the creation of fireproof thermal insulation of shut-off and control valves of small diameters, protected from external influences, providing the possibility of its maintenance and repair.

The technical result is achieved by the installation of a heat-insulating layer of non-combustible material and the use of removable structural elements that provide access to valves of small diameters for its maintenance and repair.

Moreover, the method of thermal insulation of shut-off and control valves of small diameters, including determining its geometric dimensions, according to the invention, is that the insulation is designed and made of foam glass with a protective shell individually for the design of shut-off and control valves of small diameters, taking into account its geometric dimensions and design features and the thermal insulation material is attached to the inner surface of the protective shell using mastic, while the thermal insulation contains two or Most of the parts that are connected with locks, which provides access to valves of small diameters for maintenance and repair, sealing the insulation joints is done using foam gaskets, and on the inner surface of the thermal insulation layer in contact with the locking control valves of small diameters, apply an anti-abrasive to protect its anti-corrosion coating.

Shut-off and control valves of small diameters include valves, ball valves, valves, various types of valves, etc. for pipelines with diameters from 159 to 530 mm.

The application of the method is illustrated by the device shown in the drawing.

The drawing shows a thermal insulation diagram of shut-off and control valves of small diameters using an example of a valve, where 1 is a heat-insulating layer, 2 is a sealing gasket, 3 is a protective shell, 4 is a non-removable thermal insulation of the bottom, 5 is mastic, 6 are fasteners (metal ties with locks , bolts with nuts, self-tapping screws, etc.).

The thermal insulation device for small-diameter ZRAs is individually designed and manufactured for each type of small-diameter ASA, taking into account the geometric dimensions of the equipment, design features, type of connection to the pipeline (welded, flanged), and installation method (on the foundation, without foundation).

The thermal insulation device ZRA of small diameters is a protective shell 3, to the inner surface of which a heat-insulating layer 1 of non-combustible material is attached using mastic 5.

The materials used as a protective sheath 3 provide protection of the heat-insulating layer 1 from environmental influences from mechanical damage, and are also an element of fastening of the heat-insulating layer.

The protective shell 3 with a heat-insulating layer 1 is made of galvanized steel sheet 1.0 mm thick.

The thermal insulation of ZRA of small diameters is divided into two or more parts, the joints between which are sealed with sealing gaskets 2. The shape of the casing (rectangular or shaped design) is determined taking into account the dimensions of the equipment during design.

The thermal insulation of the bottom 4 using the example of a valve is made and mounted in the factory.

The parts of the thermal insulation of small-diameter ZRA are fastened with the help of the fastening elements 6, which provides access to small-diameter ZRA for its maintenance and repair.

Work.

The thermal insulation device ZRA of small diameters provides for work in the factory and in the field.

In the factory, non-removable thermal insulation elements are manufactured and mounted, for example, for the bottom of 4 valves.

The heat-insulating layer 1 is attached to the inner surface of the protective shell 3 using mastic 5.

In the field, collapsible heat insulation elements are mounted on the gate valve, the joints between which are sealed with the help of sealing gaskets 2 made of foam rubber.

With a high content of oil vapor in the internal volume of thermal insulation, a gas analyzer and a pipe for purging it can be installed inside the duct.

The carried out experimental design work in the LLC “NII TNN” showed that it is advisable to use non-combustible heat-insulating materials based on foam glass - foam glass as thermal insulation.

Acceptable for the proposed device, the technical characteristics of the foam glass are shown in table 1.

Table 1 Technical characteristics of foam glass Name of indicator Indicator value 1. Density, kg / m ³ 110-180 2. Compression strength at 10% deformation, MPa, not less 0.70 3. Thermal conductivity at a temperature of 25 ° C, W / (m · K), no more 0.05 4. Water absorption in 24 hours,% by volume, no more 2,5 5. Combustibility group non-combustible

The thickness of the insulation of the slide gate valve is determined on the basis of thermal engineering calculations (see TR 12310-TI.2006. Foam glass insulation products in the construction of thermal insulation of equipment and pipelines. Severspetskomplekt LLC, M. - 2006).

The fastening parts of the thermal insulation of small-diameter ZRA are produced using fastening elements 6.

An anti-abrasive is applied on the inner surface of the heat-insulating layer in contact with small-diameter switchgear, which protects it against corrosion.

Before installing thermal insulation, the surface of small-diameter switchgear must be dried, cleaned of dirt, dust, ice, moisture and other contaminants. In case of adverse conditions (snow or rain), insulation works should be carried out in tents.

The application of the proposed method provides thermal insulation of ZRA of small diameters using fireproof materials with access for its maintenance and repair.

Claims (1)

A method of thermal insulation of shut-off and control valves of small diameters, including determining its geometric dimensions, characterized in that the thermal insulation is designed and made of foam glass with a protective shell individually for the design of shut-off and control valves of small diameters, taking into account its geometric dimensions and design features, and the thermal insulation material is attached to the inner surface of the protective shell using mastic, while the thermal insulation contains two or more parts that connect With the help of locks, which provides access to shut-off and control valves of small diameters for maintenance and repair, sealing of insulation joints is carried out using sealing gaskets made of foam rubber, and on the inner surface of the insulation layer in contact with shut-off and control valves of small diameters, apply anti-abrasive to protect its anti-corrosion coating.