NOTICE

Forums are temporarily disabled while we are working on a new login procedure.

When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as "anonymous". All NEW posts will show up credited to their authors. So please participate and share knowledge just as you have in the past.

You must log in if you are an existing user or register if you are a new user in order to contribute to the discussions.

Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Leachable Chloride Content of Thermal InsulationLeachable Chloride Content of Thermal Insulation
Previous
 
Next
New Post
2/18/2004 9:00 AM
 
User is offline 
No Ranking

Joined: 1/1/0001
Posts: 0
I would like to ask some additional help regarding the leachable chloride content of thermal insulation specifically 100% E type fiberglass mat used at 200C to 580C and Ceramic Fiber above 1000C to be used as insulation for austenitic stainless steel (Type304). It has been required that they are to contain not more than 5ppm of Cl content. Most manufacturers claim less than 10ppm others 40-50 ppm. In reference to ASTM C795-92(1998) it starts w/ 10ppm while in ASTMC871-95(2000) fiberglass has mean chloride content of 116ug/g. Based on my understanding the values are unaffected regardless of the units used whether ppm, mg/L or ug/g. Now what confuses me is that does the claim of this manufacturers possibly real and is the required specification of not less than 5ppm attainable? Hope you anyone could enlighten me.
 
New Post
2/23/2004 9:00 AM
 
User is offline 
No Ranking

Joined: 1/1/0001
Posts: 0
Archie: Re your insulation vs. stainless steel post, 5 ppm is a very stringent requirement for insulation materials. We do not know if this minimum can me consistently met; however, ASTM (www.astm.org) has several standard practices for testing insulation that you might want to investigate. They are WK 4189 and WK 2000. Your stated minimum operating temperatures of 200C are also above where we would anticipate chloride SCC issues unless the component cycles frequently. Also, remember that external sources of chlorides usually cause more damage than the 0-50 ppm chlorides found in insulation materials. So the insulation needs to be tight from moisture intrusion. Hope this helps! David Hendrix The Hendrix Group Inc.
 
 Page 1 of 1
Previous
 
Next
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Leachable Chloride Content of Thermal InsulationLeachable Chloride Content of Thermal Insulation


  

News

NEW! Calculation of Ammonium Salt Deposition Temperatures
With a little delay, our Calculation of Ammonium Salt Deposition Temperatures...read more
Sulfidic corrosion calculators NOW AVAILABLE
Our sulfidic corrosion calculators are now available at hghouston.com/calcula...read more

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion

Sign Up