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Evaluation of a 60-year old Iron Pipeline in a Corrosive Soil and Flow Test of a 97-year old Cement-mortar Lined Iron Pipeline

Picture for Evaluation of a 60-year old Iron Pipeline in a Corrosive Soil and Flow Test of a 97-year old Cement-mortar Lined Iron Pipeline
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Product Number: 51321-16501-SG
Author: L. G. Horn
Publication Date: 2021
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This paper details the direct assessments of two historic iron pipelines that were the first to be supplemented to control corrosion internally (in 1922 using a cement-mortar lining) and externally (in 1958 using tightly wrapped polyethylene encasement). We will discuss the methods of control, how the two pipelines were evaluated, and how this ongoing contribution of knowledge has resulted in improvements and innovations in corrosion control for modern Ductile iron water and wastewater pipelines. In 2019, a flow test was conducted by an independent contractor on a 97-year-old cement-mortar lined iron pipe in Charleston, SC. This pipeline is one of many that have been evaluated over the years to measure the hydraulic character and assess the longevity of the lining. The test enabled the calculation of the Hazen-Williams C value, which provides a definitive evaluation of the condition of the lining. A second pipeline was installed in Lafourche Parish, LA in 1958. This was the first iron pipeline to be supplemented with corrosion control using a tightly wrapped encasement of polyethylene film in an uncommonly aggressive soil environment. Having been examined at different locations over the years, this describes the procedures and results of the most recent evaluations after 60 years of service.

Key words: iron pipe, ductile iron pipe, polyethylene encasement, cement-mortar lining, internal corrosion, external corrosion, water pipeline, case study

This paper details the direct assessments of two historic iron pipelines that were the first to be supplemented to control corrosion internally (in 1922 using a cement-mortar lining) and externally (in 1958 using tightly wrapped polyethylene encasement). We will discuss the methods of control, how the two pipelines were evaluated, and how this ongoing contribution of knowledge has resulted in improvements and innovations in corrosion control for modern Ductile iron water and wastewater pipelines. In 2019, a flow test was conducted by an independent contractor on a 97-year-old cement-mortar lined iron pipe in Charleston, SC. This pipeline is one of many that have been evaluated over the years to measure the hydraulic character and assess the longevity of the lining. The test enabled the calculation of the Hazen-Williams C value, which provides a definitive evaluation of the condition of the lining. A second pipeline was installed in Lafourche Parish, LA in 1958. This was the first iron pipeline to be supplemented with corrosion control using a tightly wrapped encasement of polyethylene film in an uncommonly aggressive soil environment. Having been examined at different locations over the years, this describes the procedures and results of the most recent evaluations after 60 years of service.

Key words: iron pipe, ductile iron pipe, polyethylene encasement, cement-mortar lining, internal corrosion, external corrosion, water pipeline, case study

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