scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Corrosion of Ni-Resist cast irons in sea water

01 Jan 1993-British Corrosion Journal (Taylor & Francis)-Vol. 28, Iss: 3, pp 209-216
TL;DR: In this article, a case study of the failure of a Ni-Resist cast discharge column of a brine recycling pump from a sea water desalination plant and laboratory tests on two Ni-resist cast irons is presented.
Abstract: The corrosion behaviour of Ni-Resist cast irons in sea water has been investigated at various temperatures and dissolved oxygen concentrations. The investigations involved a case study of the failure of a Ni-Resist cast discharge column of a brine recycling pump from a sea water desalination plant and laboratory tests on two Ni-Resist cast irons. Weight loss measurements, electrochemical polarisation techniques, and metallographic methods of analysis were used to determine the corrosion rates and to investigate the nature of corrosion in Ni-Resist irons. It has been established that the discharge column of the brine recycling pump failed by stress corrosion cracking (SCC). The cracks initiated at pores and the cracking pattern was characterised by the emanation of fine cracks from large cracks. The region near the weld/base metal interface wasfound to be a preferential site for the initiation and propagation of SCC owing to the presence of higher concentrations of chromium carbide. The corrosion r...
Citations
More filters
Journal ArticleDOI
TL;DR: In this article, the performance of different materials used in different multi-stage flash (MSF) desalination plants is reviewed and various types or forms of corrosion occurring in different units of plant are described and the strong role of local attack is emphasized.
Abstract: Abstract The chemically aggressive environment generated in some parts of equipment at multi-stage flash (MSF) desalination plants can cause corrosion problems. The proper selection of materials with higher resistance to corrosion is considered as one of the most prospective approaches for smooth and efficient running of the plants. Because of this, the study of the corrosion behavior of selected materials is an important issue in the realm of desalination technology. This paper reviews the performance of materials used in different MSF desalination plants. The corrosion behavior of materials in different sections of plants, under surrounding environmental conditions, is discussed. Various types or forms of corrosion occurring in different units of plant are described and the strong role of local attack is emphasized. Case histories dealing with failure of components in different plants are cited. The criteria for the selection of materials, which depend upon the nature of environment and operating conditions, are exemplified. The merits and demerits of materials currently employed are highlighted and introduction of new materials either in existing plants as the possible replacements or in future plants are discussed.

9 citations

Book ChapterDOI
01 Jan 2020
TL;DR: In this paper, different expected forms of corrosion with their mitigation practices are described, including material selection, environment control (chemical and physical) and monitoring (direct and indirect) activity.
Abstract: When talking about seawater thermal desalination, continuous operation in harsh environments comes directly to our mind. Thus, materials integrity and plant reliability is a major concern for plant managers to satisfy the increasing water demand in arid countries. Either in Multi-Stage-Flashing (MSF) or Multi-Effet-Desalination (MED) process, hot seawater and brine are the main threats to both static and rotating equipment. In the present chapter, different expected forms of corrosion with their mitigation practices will be described. This will include two main sections: pretreatment and the desalting system where three media will be considered i.e. seawater, brine and vapors. The mitigation practices will include material selection, environment control (chemical and physical) and monitoring (direct and indirect) activity.

2 citations

01 Jan 2005
TL;DR: In this paper, the authors present case studies which suggest solutions to corrosion problems based on type of corrosion in desalination and power plants, focusing on the above mentioned factors related to material selection and corrosion control.
Abstract: Annual losses resulting from corrosion in the desalination plants are estimated to be in the order of many millions of riyals. Corrosion can be broadly defined as reaction of an engineering constructional metallic material with its environment, leading to its loss or deterioration in properties of the metallic material. If potential corrosion problems are not resolved during early stages, they will arise later in the forms of corroded unit and unexpected shutdowns. In such cases, high costs for repair or replacement of unit as well as the cost incurred by the suspension of production during shutdowns will result. Additional costs are incurred due to the loss of efficiency of heat transfer surfaces and accidents resulting from component failure. In general, to minimize the losses, the material of construction must be carefully selected from a corrosion resistance standpoint. The design details should preserve the corrosion resistance of the materials. The material needed should be accurately ordered. The unit should be fabricated properly and adequately inspected to prove compliance with the specifications. The unit must be operated and maintained properly. Focusing on the above mentioned factors related to material selection and corrosion control in desalination and power plants, this paper presents some case studies which suggest solutions to corrosion problems based on type of corrosion. The case studies include failures of different components in SWCC desalination and power plants.
References
More filters