4 replies to this topic

[Rahimzadeh]

Dear:

Please share your idea for eliminating icing in on control valve on raw sour gas.

 

Steam tracing or electrical tracing , which one is better?

Best REGARDS

M.R.Rahimzadeh

[fallah]

Mr. Rahimzadeh,

 

In general, the one is available...but the precise selection needs in depth evaluation based on process parameters and available facilities...

[Zauberberg]

It also depends where does freezing occur - on the outside surface of the valve body? stuffing box? piping downstream of the valve?

 

Proper cold insulation may solve all the problems related to icing on the valve body and piping. For cryogenic valves operating at very low temperatures, there is a bellow seal which prevents from migration of cold up the valve bonnet. See: http://www.samson-re...rdeel_7.2.2.pdf

[kiansafaie]

Icing on raw sour gas could be happened beacuse of pressure loss on control valve and decreasing temperature, so use of methanol injection on upstream of control valve, could be omiited the ice and hydrate formation on control valve. Tracing and insulation could not be useful for inhibition of ice and hydrate formation because of severe and fast decrease on temperature.

[Zauberberg]

Kiansafaie,

 

Temperature decrease within the process cannot be alleviated with the use of Methanol injection - its purpose is to decrease Hydrate formation temperature, not the process temperature. Icing (freezing of moisture of the surrounding air) must be combated against in another way.