5 replies to this topic

[Divid Kelin]

Which parameters is important for injection water to be check and there is any affect if more than specification?

[Napo]

Which parameters is important for injection water to be check and there is any affect if more than specification?

[Napo]

Excuse me,

Do you want inject water over the fin-fan cooler for increase the refrigeration and low the temperature of diésel?

Napo.

[Divid Kelin]

Hi Napo
I want to inject water over fin fan to dissolve NH4SH

[Napo]

Zayezdalshuhouni,

The following recommendation:"Considering the solubility of both salts in aqueous solutions, wash water is usually injected. The function of wash water is to clean the vapor, removing HCl, H2S, and ammonia. The partial pressure of these contaminants is then decreased, precipitation is avoided, and the salts are dissolved in water. A fraction of 25% (w/w) of injected water must be liquefied at the injection point. This water must have the following characteristics:
pH between 7 and 9, absence of cyanide, a chloride content limited to 100 ppm (optimum content of 5 ppm),
and 50 ppm of oxygen (optimum content of 15 ppm) [6]. The water must be injected at a point before the salt precipitation. Therefore, it is necessary to install an additional point for the injection of water. The use of austenitic stainless steel is not recommended due to the presence of chlorides as solid salt or as aqueous solution in the environment."

It's in the paper:"Acid salt corrosion in a hydrotreatment plant of a petroleum refinery" by Alvisi P., Lins V., Engineering Failure Analysis, December 2008, 15(8):1035-1041.

Napo.

[Vegeta]

As far as I remember, there is an API recommended practice which has what you are asking about. I think it is API RP 932 if not mistaken.

Also, check the guidelines of the licensor of your unit. I recall that different licensors have different requirements of water chemistry.

Hope that helps...