3 replies to this topic

[Arsal]

Corrosion inhibitor/Filming Inhibitor is used at crude distillation column overhead line to protect overhead line.

 

we have carbon steel overhead line(usually used in maximum refineries).Related to Corrosion inhibitor i have a following questions:

 

 

1. We prepare 4 % concentrated solution with kerosene. Is any criteria use for solution strength or either it is totally dependent on user and chemical vendor/supplier?

 

 

2.Vendor suggest to dose 6 PPM Corrosion inhibitor, Is dosing concentration will remain same or it depends upon the condition like Salt content in crude, PH, chloride, iron of tail water etc.?? If any criteria then how we adjust/Manipulate dosing with respect to changing conditions.

 

Further more,how much area will protect by corrsoion inhibitor.this will protect Line only?or also air cooler and trim cooler as well.?

Edited by rao arsalan, 07 December 2015 - 11:26 PM.

[Arsal]

Still waiting for answer?

Also one more question related to this topic that if we dose 7 ppm rather then recomended 6 ppm is this any advantage on piping protection?or just wastage of chemical?

[breizh]

Arsal ,

You should have your supplier performing test and guarantee the result of the treatment through regular report and inspection .

Probably good to stick to recommendation, more or much more  does not mean better .......

 

Breizh

Edited by breizh, 17 December 2015 - 07:04 PM.

[manojkaila]

Dear Arsal,

 

I am not expert in this field but there must be some removable corrosion coupon in the system. The vendor will monitor the rate of corrosion on this coupon and change the rate of dosing accordingly. Regular thickness monitoring should also recommended by your inspection team. Specially check for the small bore drain line which is more susceptible due to salt formation & no flow which enhance the rate of corrosion. I have witness one major accident in DHT reactor outlet line.  

 

Best luck

 

Manoj