RU27668U1 - PIPELINE HEAT INSULATION - Google Patents

Description

Thermal insulation of pipelines.

P1 acquisition relates to the field of heat engineering mainly for thermal insulation of pipelines with positive coolant temperatures

Widely known types of insulation, consisting of one or more layers of heat-insulating material with an outer covering layer 1.

The closest in technological essence to the claimed object is the design of the pipeline, the thermal insulation of which consists of a layer of polyurethane foam and an outer protective pipe made of low density high density polyethylene. Thermal insulation is fabricated using the technology in the pipe, with special equipment combining and centering the supply coarse inside the protective pipe made of polyethylene, and the annular space is filled with polyurethane foam in the liquid state, after hardening of the latter, a monolithic structure with high strength characteristics is obtained, the thermal conductivity and heat resistance of which allows reduce heat loss by an average of 20% compared with regulatory C2.1

A disadvantage of the known insulation is that the decrease in heat loss occurs due to an increase in the thickness of the layer of insulating material, which is recommended only up to standard values 3. A further reduction in heat loss by increasing the thickness of the insulation is considered impractical.

The objective of the invention is to reduce heat loss without increasing the cost of thermal insulation material.

The problem is achieved in that the thermal insulation of the pipelines contains a layer of heat-insulating material and a cover layer of cylinders and half cylinders, which are located on the gaskets with the formation of an air gap between the cover layer and the insulation layer. Gaskets are installed on insulation around the circumference in the amount of four pieces at an equal distance from each other under the edges of the cylinders or half-cylinders. Heat losses are determined by

q (T-t,)) / RTp.

where q is the heat loss of 1 linear meter of the pipeline, W m

T is the temperature of the coolant, ° C,

Device Object 1WIKF16L5906

The thermal resistance of the pipe is determined by the formula:

R tot RTp. RB + RCT + KIE + KPKsl + RH,

where: RB R, RH3 yRnKra-Rn, respectively, thermal resistance of heat transfer from the heat carrier to the wall, thermal conductivity of the wall, insulation and coating layer, heat transfer from the outer surface,

m ° C / W.

Rtot is the required thermal resistance, m ° -C / W.

The thermal resistance of the pipeline in the presence of an air gap will be:

Rip. - RB + RCT + Rii3 + RBn + Rnicc

where - RBn thermal resistance of the air gap, m ° C / W / 4 /.

A comparative analysis with the prototype shows that the claimed thermal insulation of pipelines is characterized by the presence of an air gap formed between the insulation layer and the coating layer due to the location of the latter on the gaskets. Thus, the claimed thermal insulation of pipelines meets the criteria of the invention of novelty.

Comparison of the proposed solution not only with the prototype, but also with other technical solutions in the field of thermal insulation of pipelines, did not reveal the signs that distinguish the claimed solution from the prototype, which allows us to conclude that it meets the criterion of significant differences.

The invention is illustrated by drawings, in which transverse longitudinal sections of pipelines are shown. FIG. 1 is a side view of the pipeline; FIG. 2 is a view along AA.

An anti-corrosion layer 2 is applied to the pipeline I, on which an insulation layer 3 is strengthened using wire twists. An air gap 5 is created between the insulation 3 and the outer cover layer 4 by attaching half-cylinders or cylinders to four gaskets 6, fixing the position of the coating layer relative to the insulation surface. The presence of an air gap in the thermal insulation of pipelines allows you to save heat.

The table shows the results of the analysis of the use of the air gap in the thermal insulation of pipelines when laying in impassable channels. The influence of the air gap of 6 10 mm on heat loss of 1 pm of the pipeline (t 150 ° C) Table

Claims (1)

Thermal insulation of pipelines containing a layer of heat-insulating material and a cover protective layer, characterized in that gaskets are inserted located between the cover layer and the insulation layer with the formation of an air gap between them.