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RE: STAINLESS STEEL: Appropriate Material Selection for Industrial Waste Treatment Structures

[Subject Prev][Subject Next][Thread Prev][Thread Next] In general Type 316 L is used in most industrial wastewater plants, but that is by no means an absolute. Example: Hydrogen sulfides are common in certain portions of wastewater treatment plants. Below the liquid level, it is not too aggressive. Above the liquid level (as in a head works or lift station) the hydrogen sulfide converts to low concentration sulfuric acid. Most exposed stainless steel will not be around for long. You could go to Carpenter 20, but it is pricey, pricey, pricey.

When it comes to SS applications, one has to look at the corrosive agent, the concentration of that agent, the temperature, and the expected life of the element. You can calculate mils per year of section loss of the element by using published curves for that particular material, temperature, and agent exposure. Size the element predicated on the stress, the material thickness required for that given stress, and add sacrificial thickness based on the life expectancy (mils/year x expected years of service).

And there you have it, ...chemical engineering 101.

Regards,
Harold Sprague




From: "Polhemus, Bill" <Bill.Polhemus(--nospam--at)tyson.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: STAINLESS STEEL: Appropriate Material Selection for Industrial Waste Treatment Structures
Date: Wed, 20 Apr 2005 08:08:11 -0500

I think that Harold Sprage (in
http://www.euken.net/group/seaint/mailarchive/2005b/msg00250.html)
mentioned having access to personally-collected data on stainless steel
material applicability, so he may be the one to answer this question.

If you've got "industrial wastewater processing," what is the proper SS
material to specify?




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