Testing method for predicting residual service life of buried metal water supply pipeline

Abstract

The invention discloses a testing method for predicting the residual service life of a buried metal water supply pipeline, which relates to a testing method comprising the following steps: (1) inputting testing data of environmental factors affecting the corrosion of the buried metal water supply pipeline and water quality change conditions in the pipeline in different periods of time into a computer; (2) respectively computing the collected data in the computer by a mathematical statistics method, and establishing a nonlinear regression equation in one unknown; (3) computing the weighted value of each factor affecting pipeline corrosion by a grey theory computing method; (4) establishing corrosion rate models (an internal corrosion model and an external corrosion model) of the buried metal water supply pipeline; and (5) according to an electrochemical model of the soil corrosion rate, respectively establishing prediction models for the residual service life of the buried metal water supply pipeline by uniform corrosion, local corrosion and pitting corrosion, and computing the residual service life of the buried metal water supply pipeline by an approximate analytical method. The invention provides a technical reference for carrying out transformation and renovation of pipelines and improving the safety of a water supply system.

Description

technical field [0001] The invention relates to a test method, in particular to a test method for predicting the remaining life of buried metal water supply pipelines. Background technique [0002] The water supply pipeline is an important part of the urban water supply system, ensuring the safe operation of the water supply system directly affects the economic and social benefits of the water supply enterprises. At present, more than 90% of my country's water supply pipes are metal pipes such as cast iron pipes, steel pipes, and ductile iron pipes (collectively referred to as metal water supply pipes). In recent years, 85% of newly built water supply pipes still use metal pipes. With the water quality composition and flow state inside the water supply pipeline and the influence of soil diversity, immobility, inhomogeneity, time, season and region, internal corrosion and external corrosion will inevitably occur inside the water supply pipeline. According to relevant statist...

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Problems solved by technology

In addition, due to the internal corrosion of the pipe network, the urban water supply that meets the water quality standard has "secondary pollution" during the pipe network transportation process, and the water quality has declined to varying degrees. , "colored water", "black water" and other phenomena have seriously affected the safety and normal use of people's daily life and industrial water

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