RU2154227C2 - Pipe line temperature extension compensator - Google Patents

Abstract

FIELD: construction engineering; compensation of temperature extension of pipe lines handling liquids containing solid particles. SUBSTANCE: inner surface of compensator is protected by branch pipe connected with sleeve. Clearance is provided between walls of protective branch pipe and sleeve which is communicated with liquid being handled, thus increasing force holding the sealing rings towards inner surface of compensator housing. EFFECT: enhanced reliability. 1 dwg

Description

 The invention relates to a pipeline transport of clean liquids and containing solid particles, is intended to compensate for the temperature extensions of the pipeline.

 Known compensator for thermal deformation of the pipeline [1]. The compensator has an elastic ring, for example of rubber, which is pressed against the sliding surface by the pressure of water flowing through the pipeline. The annular ring in which the sealing ring is located has a cavity and radial holes made in a circle. The specified device is taken as a prototype.

 The disadvantage of the prototype is the lack of protection of the sliding surface from damage (abrasion) during transportation of liquids having solid particles.

 The purpose of the invention is to develop a compensator for pipelines transporting liquids, both clean and having solid particles.

 This goal is achieved by the fact that two o-rings with clips and cups are installed in the compensator body, a metal pipe is attached to the first cup in the direction of fluid flow, which protects the sliding surface from the action of solid particles in the fluid.

 The design of the compensator is shown in the drawing, section.

 The housing of the double-sided compensator 1 has a sliding surface 2, protected from corrosion. The sealing rings 3 are inserted into the metal casing 4. The casing under the sealing ring has an annular cavity 5 and radial holes 6. The protective pipe 7 is attached to the glass 8 (the first by fluid movement). Between the nozzle, clips and the second glass, a gap 9 is formed, which communicates with the interior of the pipeline. The ends of the case are equipped with chamfers.

 The sliding surface after processing on the machine is protected by an anti-corrosion coating, for example by applying a layer of metal (chrome, nickel) in an electrolytic bath or by applying a paint layer.

 The sealing ring is made of an elastic material, such as rubber, with a diameter several millimeters larger than the diameter of the sliding surface, which allows it to be inserted into the housing with pressure and thereby obtain the initial seal of the compensator. In the calculations, the initial seal of the compensator is 0.05 MPA.

 The pressure of the sealing ring on the sliding surface during the operation of the steel pipeline can reach 2.0 or more MPa.

 In the proposed design of the compensator, the water pressure forces pressing the sealing ring to the sliding surface are 1.8 to 1.9 times greater than the forces directed to tear the ring from this surface. Given the initial compaction of the compensator, its density margin is two or close to this value.

 During the operation of the pipeline, temperature extensions are compensated by the movement of the ends of the pipes connected to the glasses of the compensator. Solid particles in the transported fluid move along the protective pipe in the direction of flow and under the influence of kinetic energy pass the gap between the protective pipe 7 and the second glass 10, without falling into the space where the sealing rings and the sliding surface of the compensator are located. The length of the protective pipe is assumed to be sufficient to maintain a gap between it and the second glass at the maximum design value for reducing the length of the pipeline from lowering the temperature.

 The compensator with two o-rings works on two spans of the pipeline, one ring per span. Such a solution allows halving the number of expansion joints and fixed supports when laying onshore pipelines, which gives a significant economic effect in the construction of pipelines.

 The compensator is frost resistant. During glaciation in the emergency, ice may appear on the walls of the compensator body between the sealing rings. There is no water on the surface of the sliding surface from the o-ring to the end of the housing, therefore there will be no ice. The movement of the sealing rings to the end of the housing during cooling of the pipeline occurs without interference.

 The design of the double-sided compensator makes it relatively easy to replace the o-ring after the end of its life. To replace the ring, move the case, open the ring, and after replacing the ring, return the case to its original place, which does not require gas cutting and welding.

 The use of expansion joints with a protective pipe allows you to lay pipelines for industrial and civil facilities transporting clean liquids and liquids containing solid particles.

 On pipelines of land and channel laying, stuffing box compensators freeze in the winter and fail. The introduction of compensators of the proposed design gives a high technical and economic effect.

Sources of information
1. SU 149980 A, 1962, F 161 51/00.

Claims (1)

 Compensator of temperature extensions of the pipeline, containing clips and glasses placed in the housing, sealing rings embedded in clips having radial openings that communicate with the cavity under the sealing rings to the space of the pipeline, characterized in that a protective pipe is attached to the first flowing liquid of the glass, and between the walls of the protective pipe and glasses formed a gap that communicates with the space of the pipeline.