Flow of steam service
Flow of steam service
(OP)
Working on a problem and looking for feedback. I have a DP element on a steam application, there is concern the measurement is not accurate. The install has the impulse lines at a 45deg to a condy pots, then a wet legs to the transmitter, fairly standard. Thermal imaging shows the High side pot to be 105C down to 60C and the low side steady at 30C.
Any thoughts as to why the differential in temp? Is this the cause for the error?
Any thoughts as to why the differential in temp? Is this the cause for the error?





RE: Flow of steam service
What is your primary element orifice or pitot tube?
Roy
RE: Flow of steam service
I suggest that you isolate the transmitter at the 3 valve manifold and attempt to ensure there is no flow through the impulse lines.
Roy may be onto something when he suggests there may be a greater circulation one one side. So check that that the tappings on the DP element provide a steam/condensate interface on the same horizontal plane.
I trust this helps,
Mlv
http://www.coulton.com
RE: Flow of steam service
Are the impulse lines hard pipe or tubing?
Are the pots filled with antifreeze?
Are both filled equally and with the same fill fluid?
Could water boiled away on one leaving more antifreeze in one than the other?
Is the installation suitable for replacing the condensate pots with siphons?
...
RE: Flow of steam service
RE: Flow of steam service
Uneven slopes of the sensing lines so that the HP pot drains more freely?
Could be something as simple as the HP Pot root valve is mounted with a horizontal stem so the steam propogates thru it freely, but the LP root valve mounted vertically has effectively a P-trap in it. That would probably also intriduce several inches of zero error in the signal.