STAINLESS STEELS IN THE WATER INDUSTRY - COST & QUALITY BENEFITS
 Part 1 AID TO SELECTION and ADVANTAGES OF STAINLESS STEEL

This information is part of a four-hour presentation STAINLESS STEELS IN THE WATER INDUSTRY, put together by NDE’s technical team and approved by Consulting Engineers South Africa (CESA), which is offered by NDE to companies considering the use of stainless steels in their water application projects, processes and installations. 

If you would be interested in attending one of these presentations in the future, please click MORE INFO and APPLICATION FORM

 

As maintenance costs escalate and plant maintenance becomes more difficult, the use of stainless steels in water applications has increased significantly world-wide.

Care needs to be taken with selection and design of stainless steels in order to ensure low maintenance applications.

Pitting corrosion, caused by chlorides in water, is the most likely problem to arise during the life of a stainless steel installation.

Understanding the corrosion mechanisms which can occur in stainless steels can have a profound influence on the way we:

  • Design equipment
  • Design plant layout
  • Design actual process
  • Run the plantAid to selection graph

AID TO SELECTION OF STAINLESS STEEL

There are over 500 grades of stainless steel and the graph below is an indicator of which grade is suitable for a particular application, based in this instance on water temperature and chloride levels.

In assessing upfront the grades to be specified, there are several areas that require attention:

  • Temperature
  • Chloride concentration of the water
  • Oxygen content of the water
  • Unusual conditions such as static solids and industrial waste water
  • Introduction of chemicals
  • Handling and storing of chemicals
  • Flow rates

ADVANTAGES OF STAINLESS STEEL

After selection of the appropriate grades for the application(s) intended, stainless steels will offer significant advantages.

  • There should be minimum problems with atmospheric corrosion provided the correct grade is chosen
  • Stainless steels are better than other most commonly used materials in high velocity and turbulent flow lines
  • They do not depend on coatings to perform well
  • Stainless steel is a sustainable material and fully recyclable

The following table provides more details of the advantages offered by the different characteristics of stainless steels in water industry applications:

Characteristics

Advantages

High corrosion resistance

Low maintenance, consistent operation

No corrosion or leach products,
no organoleptic or turbidity problems

Clear and pure drinking water

Smooth surface

Less bacterial slime, low energy consumption,
low cleaning costs, good for conveying wet solids

Recyclable

Cost benefits and low environmental impact

Good wear and fatigue resistance

Low maintenance, long life

Materials covered by well-defined standard specifications

Ready availability in most product forms

Attractive appearance

Clean, hygienic, ‘high tech’ image

In our HYGIENIC story next month, November 2019, we will look at Part 2 
AREAS & APPLICATIONS WHERE STAINLESS STEELS HAVE BEEN EFFECTIVELY USED and COST BENEFITS

At NDE we stock a broad and comprehensive hygienic product range for water and many other hygienic industries and we offer guidance on the appropriate materials
and grades to do the job.

 
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October 2019

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