Piping Vibration Dampers

[MaintEngnr]

My company operates a small steam/water test loop. We have two locations in our piping system with Blaw Knox vibration dampers. The nameplate indicates Size 8, Type 2A, Patent# 2,215,238. Does anyone have the rating information on these or know how we might obtain it?

 

[MJCronin]

Blaw Knox ended operations in 1977...... Is the equipment very old ?

Can you submit pictures ?

MJCronin
Sr. Process Engineer

 

[rconner]

That patent was filed for in 1938, and when granted dated 1940. You may be interested in the write-up at

https://www.google.com/patents/US22...a=X&ei=DYTsVLydKImkgwSmpoKwDA&ved=0CC0Q6AEwAg

(or maybe prettier pictures and format available with similar search at uspto.gov etc). This one was also referenced by several other folks/companies in later patents, that may also be of interest to you.

 

[MaintEngnr]

Yes, they are old. They were installed when the facility was constructed around 1962-63. Unfortunately I am unable to post pictures, but the link rconner provided gives a good look at the spring mechanism. I am hoping to find any technical information that might still exist out there (e.g. spring rate, etc.).