Long conveying pipeline construction method capable of simultaneously clearing pipe and testing pressure

Abstract

The invention relates to a long-distance pipeline construction method for carrying out tube clearing and pressure testing procedure at the same time. The invention can combine such two working procedures into one as long-distance pipeline clearing and pressure testing, which simplifies construction procedures, and not only shortens the construction period, reduces construction investment both in manpower and in material resources, but also gains remarkable social effect. The invention comprises the following operation steps that: the lower end of the pipeline acts as a ball-pushing water entry for tube clearing and pressure testing, while the higher end of the pipeline acts as a pipeline ball-pulling end; tube clearing and pressure testing are carried out at the same time, that is, while the water in the tube is fed, a tube cleaner plays a function of ball isolation while feeding water as well as a function of tube cleaner; after the two tube cleaners enter into a ball-pulling device, a thermometer is well installed; water injection pressure of a pressing vehicle at the lower end is controlled so as to slowly inject water into the tube; when the pressure rises to the strength test pressure and after 4 hours of pressure keeping, water is drained and pressure is decompressed to the leaking test pressure through a needle valve at the ball-pulling device, and the pressure is kept for 24 hours; after completion of pressure test, air pressure ball out water drain is carried out by the tube cleaner.

Description

1. Technical field: [0001] The invention relates to a pipeline construction method, in particular to a long-distance pipeline construction method in which pigging and pressure testing procedures are performed simultaneously. 2. Background technology: [0002] In the background technology, the current specification for the construction of long-distance pipelines is "Code for Construction and Acceptance of Oil and Gas Transmission Pipeline Engineering" SY0401-98. Clause 9.2.1 of this specification clearly states: "Segmented pressure tests of long-distance pipelines Before the test, the pig should be used for pigging, and the number of pigging should not be less than 2 times." At the same time, clause 9.3.3 also stipulates: "During the pressure test, an isolation ball should be added to prevent the presence of air in the pipe and affect the test pressure. Judgment of pressure results". From the above regulations, it can be learned that pressure testing and pigging of long-dist...

AI Technical Summary

Problems solved by technology

This conventional construction method requires a long construction period and a lot of manpower and material resources. If it is on a construction site short of water, the waste of water is even more prominent.

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