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HRSG Boiler Drum Inspection

Friday, February 09, 2018   By: Singapore [2228] 0 Stars

Our boiler has recently switched from AVTR to oxygenated treatment CWT. However, Im concerned over the state of our HP boiler drum ~130bar as it is covered with layer of magnetite black instead of hematite reddish-brown.

While our IP & LP boiler drum are covered with hematite layer.

If your boiler is running on oxygenated treatment, could you share with us the state of the oxide layer in HP drum?

Thank you!

Singapore Power Industry

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Saturday, February 10, 2018   By: Ross [390] 5 Stars
Just so we can get a better perpective can you upload a picture of the drums watersides?

Do you have a hp deaerator as well as a lp deaerator?

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Sunday, February 11, 2018   By: Yude Singapore [2228] 0 Stars
Hello Ross!

Thank you for your reply.

We do have an combine deaerator for topping up our Feedwater just before entering condensate preheater. However, since we have moved from AVT-R to oxygenated treatment CWT, we have altered our deaerator to provide us with 25ppb of dissolved oxygen in Feedwater instead of removing dissolved oxygen totally.

As for the photo, do you mind leaving your email / WhatsApp contact number?


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Sunday, February 11, 2018   By: Ross [390] 5 Stars
Okay, you have ones deaerator.

Please upload photos of your watersides here.


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Wednesday, July 04, 2018   By: Vangel [2265] 0 Stars
We use High-pH AVTO with O2 at about 25 ppb at condensate pumps discharge and 0 ppb at LP Drum. We also add TSP at IP Drum. All of our drums are red because of a constant hematite layer

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Published on steamforum.com


High Sulfite Residual
By: Ross. [390]

First, I want to say that large amounts of Sodium Sulfite NaSO3 becomes a contaminate because it will produce foaming and other problems, but foaming is the primary problem.

Your 500-psi Water Tube Boiler is seems to have reasonable level of residual Sodium Sulfite NaSO3 remaining in the boiler water. Nice pH too.

Your 300-psi Waste Heat Recovery Boiler has twice what I would expect for Sodium Sulfite NaSO3 at ranging 80-ppm to 100-ppm. pH is good so you are getting a good yield.

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