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dhourigan

Member Since 14 Jun 2012
Offline Last Active Dec 13 2017 11:41 PM
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Posts I've Made

In Topic: Do You sell Pre-Passivated Corrosion Coupons?

18 April 2013 - 12:52 PM

What is the ASTM Method by which they passivate those coupons? What is the purpose in using them other that to try to make your corrosion rates look better than some one else's?

 

I just went to there site and could not find any such product. I did see that they sold test kits to test passivation which is interesting.

 

Can you provide a hyperlink to the passivated coupons?


In Topic: Using RO Reject for Boiler Make Up

12 December 2012 - 04:59 AM

In general...no. The problem is in the details. What is the exact water analysis? And what is the pressure of the boiler?

In Topic: Ashrae 188

05 December 2012 - 06:51 PM

You know what happens, James. Legislators LOVE to Legislate. It most certainly WILL become law.

Before that it will be used in Law Suits and required by insurance companies to protect themselves from paying huge claims in wrongful death and injury cases.

In Topic: Ice Rink Brine Treatment

04 December 2012 - 10:08 PM

Erik,

I was going to give someone else a chance to answer this since I was out all day. But I am back so I guess I will wade in. First, I have never treated one of these systems. I would assume that you would use soft water since that would be preferred in all closed loop systems. Most Phosphonates require a minimum of 30 ppm of Calcium as Calcium Carbonate in order to provide adequate corrosion protection. This is NOT consistent with the idea of using soft water.

However, there is one phosphonate that does not require the presence of Calcium. It is a fairly good cathodic inhibitor in its own right. This is Hydroxyphosphonic acid (HPA). I would recommend that you use that and maintain a 15 to 20 ppm residual. There will be some initial loss due to adsorption to metal surfaces.

You mention an azole....yes, of course.

Now to the polymer. What do you intend for it to do? There are different choices for Calcium Phosphate, Calcium Sulfate, Calcium Carbonate, Silica, etc. This is always a guess depending upon what you expect to precipitate. In some formulations you might have no polymer. But since I believe that you should have soft water here, controlling iron is a likely concern. A possible choice for a soft water program would be a terpolymer that would be good for iron sequestration. Possibilities are ACUMERâ„¢ 3100 from Dow or Carbosperseâ„¢ K-781, K-797, and K-798 Acrylate Terpolymers from Lubizol.

You did not mention buffering, but you may want to put in some borate and a little caustic to maintain the pH around 8.5.

Dick Hourigan

In Topic: AWT SEED Program

26 November 2012 - 07:43 PM

Patrick,

Doing an online series does sound interesting. I would have to start really basic, however. They need to be short in duration. I am thinking 10 to 15 minutes or perhaps up to a half hour in length. Many would lose patience sitting in front of a computer watching for a full hour. If I lose my audience then what is the point.

I imagine it would go like this:
  • About water, in general.

  • Chemical and physical properties of water

  • Basic Water Chemistry

  • Industrial uses of water for cooling

  • Industrial uses of water for heating

  • Chemical Treatment of cooling water for scale

  • Chemical Treatment of cooling water for corrosion

  • Chemical Treatment of cooling water for biological fouling

  • Chemical Treatment of closed loops (perhaps break this into subsections as well)

  • Chemical Treatment of steam boilers for scale

  • Chemical treatment of steam boilers for corrosion

  • Chemical treatment of condensate

  • Chemical pretreatment

  • Water conservation in cooling towers

  • Automated chemical feed and bleed of cooling towers

  • Water and energy conservation in boilers.

  • Automated chemical feed and bleed of steam boilers

  • Understanding applying scaling indicators in cooling systems

  • Understanding and running mass balances in cooling towers

  • Understanding cavitation
That is probably just the first 20. I bet I could get into 20 more....such as corrosion coupons, interpretation of lab analysis, non-chemical devices, etc.The reason to start at the very beginning is to know what you have already covered in an earlier video/presentation.