Roger... Davis-Besse has what are called flapper valves installed in floor drains. They are metal devices installed just a few inches below the grating. The intent of the installation is flood control but serve to restrict air flow as an unintended benefit. I can probably dig up some info for you if desired,
-----Original Message----- From: Aguilera, Roger [mailto:[email protected]] Sent: Wednesday, September 21, 2016 11:38 AM To: [email protected] Subject: *EXTERNAL* [powernet] Floor Drain Devices Does anyone use devices in their floor drains that prevent positive air flow out of the drain but allows the drain to work as designed. We at STP find particles around the floor drain due to positive air flow up through the drain There are rubber check valves we are researching Thanks Roger Sent from my iPhone Powernet - a service of the Health Physics Society Power Reactor Section To post message: Send or Reply to: [email protected] To unsubscribe: send message to [email protected] archive(Nov2015->): http://www.mail-archive.com/[email protected]/ archive(<Oct2015): http://www.mail-archive.com/[email protected]/ If questions, contact E. Scott Medling, CHP at [email protected] ----------------------------------------- The information contained in this message is intended only for the personal and confidential use of the recipient(s) named above. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this document in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify us immediately, and delete the original message. Powernet - a service of the Health Physics Society Power Reactor Section To post message: Send or Reply to: [email protected] To unsubscribe: send message to [email protected] archive(Nov2015->): http://www.mail-archive.com/[email protected]/ archive(<Oct2015): http://www.mail-archive.com/[email protected]/ If questions, contact E. Scott Medling, CHP at [email protected]
