[labnetwork] duct material for pyrophorics

[Paolini, Steven]

Iulian,
 The Teflon coated ducts are designed for acid/base exhaust. The product was developed as a zero flame spread material to replace plastic and is required by major insurance underwriters. This duct material is referred to as PSP and it is made of stainless steel with a Teflon coated interior to resist the corrosion from strong acids. PSP is notoriously expensive and cannot be reworked in the field, therefore the measurements need to be accurate before fabricating.  Any metal exhaust can be used for pyrophorics if local and state ordinances are adhered to. I suspect that the downstream exhaust is PSP and the proposal is to maintain the integrity of the system. We here at Harvard use PSP materials for any modification or new addition to acid exhaust applications for that reason.
Generally, galvanized metal is used for pyrophoric gas cabinet exhaust and because we don't consider these gases acidic by nature, we use an exhaust system that is isolated from our acid/base exhaust.
Regards,
    Steve Paolini

-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Iulian Codreanu
Sent: Tuesday, January 31, 2012 1:09 PM
To: Fab Network
Subject: [labnetwork] duct material for pyrophorics

Good Afternoon Fab Network.

Is it a good idea to have the inside of the exhaust ducts serving pyrophoric gas equipment coated with teflon?

Thank you very much for your help.

Iulian
--
iulian Codreanu, Ph.D.
Director, Penn NanoFab
200 South 33rd Street
Room 376 GRW Bldg
Philadelphia, PA 19104-6314
P: 215-898-9308
F: 215-573-2068
www.seas.upenn.edu/~nanofab

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-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Iulian Codreanu
Sent: Tuesday, January 31, 2012 1:09 PM
To: Fab Network
Subject: [labnetwork] duct material for pyrophorics

Good Afternoon Fab Network.

Is it a good idea to have the inside of the exhaust ducts serving pyrophoric gas equipment coated with teflon?

Thank you very much for your help.

Iulian
--
iulian Codreanu, Ph.D.
Director, Penn NanoFab
200 South 33rd Street
Room 376 GRW Bldg
Philadelphia, PA 19104-6314
P: 215-898-9308
F: 215-573-2068
www.seas.upenn.edu/~nanofab

_______________________________________________
labnetwork mailing list
labnetwork at mtl.mit.edu
https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork