I'm an old guy and for decades, the prescribed method of DP transmitter mounting on a steam line has been BELOW the steam line with water filled wet legs to protect the transmitter from the steam heat.
Rosemount just re-wrote the rules (for certain conditions).
The way I heard the story is that someone at Emerson ran across a DP transmitter installed above the steam line, not below, obviously with no wet legs, with just a coplanar manifold valve assembly on the top of an averaging pitot tube. It had been running for about a year, with no apparent damage. Emerson sent people to investigate and have released this white paper
http://www2.emersonprocess.com/siteadmincenter/PM%20Rosemount%20Documents/00870-0200-4809.pdf
Check out the IR image of the transmitter on page 8.
My source attended an Emerson's annual customer conference and heard about it there.
Who'd a thought?
No Wet Legs on Steam Flow DP Transmitters?
Re: No Wet Legs on Steam Flow DP Transmitters?
