fpnut
Mechanical
- Feb 3, 2015
- 20
Hi All,
I recently came across this problem, though I am not responsible for it, but found it interesting nonetheless.
A chemical plant recently replaced a valve for a cryogenic liquid (ethylene). Previously they had been using a ball valve, but for some reason they chose to use a globe valve - perhaps to control the flow rate. Immediately after installing and using it, they noticed that after the valve discharge, a temperature increase of 1.5-2 degrees was observed. Everything was properly insulated.
So my conclusion immediately was that somehow the valve had introduced the heat gain - any ideas what would cause this? The globe valve is the same size as the pipe, though obviously it will introduce a bigger pressure drop compared to the full bore ball valve they had before.
I recently came across this problem, though I am not responsible for it, but found it interesting nonetheless.
A chemical plant recently replaced a valve for a cryogenic liquid (ethylene). Previously they had been using a ball valve, but for some reason they chose to use a globe valve - perhaps to control the flow rate. Immediately after installing and using it, they noticed that after the valve discharge, a temperature increase of 1.5-2 degrees was observed. Everything was properly insulated.
So my conclusion immediately was that somehow the valve had introduced the heat gain - any ideas what would cause this? The globe valve is the same size as the pipe, though obviously it will introduce a bigger pressure drop compared to the full bore ball valve they had before.
