3 replies to this topic

[Ahmed12536]

One of the Instrument air driers  is giving dew point of -50°C at start but in 12 -20 hours it goes above -40°C. All possible checks like regen sequence, passing of XVs, defective 4 way valves have been done .Finally the alumina desiccant also was replaced. Still the same behavior. The other driers in the other areas is perfect and they have the common Prefilter and after filter.

A few days ago, with drier in isolated condition (inlet air open, outlet closed) wetness was seen on the tower (incidentally, high humidity in ambient air) and in the outlet manifold chilling was noticed with water dripping from some valve joints! This is seen for the first time.

Please find the attached Sheets as well a.) Drawing b.) A filled Sheet (questionnaire) from Supplier but could not help much

Attached Files

•  Drawing.pdf   171.56KB   54 downloads
•  Questionnaire.pdf   130.46KB   35 downloads

[Bobby Strain]

They are dryers, as you should have noted from the drawing that you attached. Drier (having less moisture) describes the air outlet from the dryer. But I give you credit for properly spelling desiccant.

 

Bobby

Edited by Bobby Strain, 05 June 2016 - 02:03 PM.

[Mahdi1980]

If the air quality passing through both driers is the same and one of them has an acceptable operating condition, you should check the absorbent material of the one that has malfunction.

Moreover, check the PSV and vessel openings which may have a leakage to the environment.

 

Mahdi

Edited by Mahdi1980, 06 June 2016 - 01:34 AM.

[daniwibowo8]

Dear Ahmed,

 

have you check purging pressure for regeneration and water content inlet of your heatless dryer?

 

Thx

Dani