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Use of Admiralty Brass - High Temp CW Service

Use of Admiralty Brass - High Temp CW Service

Use of Admiralty Brass - High Temp CW Service

(OP)
Does anyone have information regarding the use of Admiralty Brass tubing bundles in cooling water service (tube side @ 100 deg F) and naphtha service (shell side @ 150-300 deg F)?

A history of failures, fouling concerns, etc. is what I'm interested in.

Thanks

RE: Use of Admiralty Brass - High Temp CW Service

Admiralty brass should be acceptable in your service. Do you have any specific problems in your existing cooler/condenser? Enough water flow rate can decrease fouling in tubes.

RE: Use of Admiralty Brass - High Temp CW Service

(OP)
PAN:

Our problem is that someone decided about 20 years ago to replace existing Adm. bundles with carbon steel.  This sacrificed a good life of 16+ years with a poor life of <7 years.  And, this was replicated several times over that 20 year span.

Our CW system does have problems with flow, though I am unaware of the rate in this exchanger at this time.  It's a systemwide problem that is being addressed over the next 18 months with upgrades.

My concern - being new to this field of corrosion - stems from a comment made by an "old timer" who seemed to remember problems with Adm. bundles at high temperatures.  The only thing, I can't find any supporting evidence as such.

Thanks.

RE: Use of Admiralty Brass - High Temp CW Service

Both fouling and corrsion rate in carbon steel are higher than admiralty brass. However, as copper alloy tubes cost over 3 times as much as carbon steel,if you can have sucessful cooling water treatment, the carbon steel tubes are estimated to serve over ten years.

In my understanding, 150-300 degree F is not a high temperature service for admiralty brass.

RE: Use of Admiralty Brass - High Temp CW Service

(OP)
Thanks for the information PAN.

RE: Use of Admiralty Brass - High Temp CW Service

Try to use sacrificial anodes plates as well.
I agree that Admiralty brass is better that CS for these
services

RE: Use of Admiralty Brass - High Temp CW Service

Admiralty brasses UNS numbers C44300, C44400, C44500 increase their resistance to dezincification (dealloying) -happening sometimes in slow-moving or stagnant waters- by small additions of phosphorous (0.02-0.06%). These brasses have largely replaced much older admiralty -unhinhibited- brasses.

RE: Use of Admiralty Brass - High Temp CW Service

(OP)
Thanks all.  The information is good that  you have provided.  Now, if I can just get the team to bite on replacing carbon steel bundles with admiralty bundles!

Thanks again!
Brent

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