SU1721378A2 - Method of mounting of butt joint of pipe lines - Google Patents

Abstract

The invention relates to pipe connections and mokhet be used when installing pipes in field conditions. The purpose of the invention is to simplify and speed up installation. The method involves applying a sealant (glue) to the inner surfaces of the pipes in advance in the factory or stationary conditions with the organization of control (calibration) of the thickness of the applied layers. After that, the pipes are transported to the site. At the object, just before the pipes are pulled over, the nipple is coated on the seating surfaces with a sealant (glue) that has adhesion to the sealant (glue) applied to the pipe. After pushing the pipes onto the nipple, the freshly applied hermetic (glue) due to mutual adhesion with the previously applied sealant on the pipe forms a monolithic sealing layer in the joint.

Description

The invention relates to nipple type pipe joints and can be used in the manufacture of pipes and pipelines and land reclamation, water supply, long-distance transportation systems, ventilation systems, sewage systems and others.

The aim of the invention is to simplify and speed up the pipeline installation process.

To do this, the inner surface of the pipe is covered with a sealant or glue at any stage, starting with its manufacture, and the materials of sealants or adhesives applied to the pipe and nipple have mutual adhesion. At the same time, the materials should not lose adhesion over time.

This method of pipeline installation greatly simplifies and speeds up the installation process at the facility, since the application

sealant or glue on the pipe in the production workshop or in a specially prepared place allows improving the quality of application and facilitating control of the required layer thickness due to the use of special mechanisms and calibers (devices), which are difficult to use in field conditions.

The proposed method is carried out as follows.

A layer of sealant or glue is applied to the inner surface of the pipe to the depth of the butt nipple and to the thickness, different gap between the inner surface of the pipe and the outer surface of the closure part of the nipple, during the manufacture of the pipe in the production workshop or on a specially equipped site, etc. After that, the pipes are transported to the site. On the object just before pushing the pipes onto the nipple

, ND

; s

h |

oo

 Yu

The nipple is coated with a sealant or glue of the same or a different brand, but with good adhesion to the sealant or glue applied to the pipe. In this case, control over the thickness of the applied layer is not required. After the pipes are pulled onto the nipple, a freshly applied sealant or glue, due to penetrating (adhesive) ability and under the action of tension in the joint, inserts the sealant or glue previously deposited on the inner surface of the pipe into the surface layers and provides a monolithic sealing layer in the joint. In view of this, it is not necessary to control the time between the application of a sealant or glue and the achievement of an electroplastic state by it.

The proposed method was tested at the experimental site of the institute when installing the F 299 mm pipeline from TEG-300 pipes (TU-33-2 75-85) using low-pressure polyethylene nipples. At the same time, bitumen-rubber mastic was applied to the inner surface of the pipe.

MBR-90 in a heated form in the laboratory under the control of the layer thickness using a gauge. The pipeline was installed after 23 days. In the process of mounting, the nipple mounting surface was covered with bitumen-shale mastic of the SBN brand, which has good adhesion with the MBR-90 mastic, after which the pipe was immediately pulled over the nipple. The assembled pipeline with a significant simplification and acceleration of installation directly at the site (installation time shortened by 2 times) showed complete tightness during testing.

Claims (1)

The invention The method of installation of a butt joint of pipelines according to the author No. 1657826, characterized in that, in order to simplify and speed up installation, the inner surface of the pipe is coated with a sealant or glue at any stage, starting with its manufacture, and materials of sealants or adhesives applied to the pipes and nipple have mutual adhesion.