4 replies to this topic

[colt16]

Dear all, 

 

In API 610 Material Selection guideline, it is described that for Naphtha and temperature under 230 degC, Class S-1 material will be used.

 

This means that for Naphtha, cast Iron impeller material may be used. Our client specified Class S-6 which is an overspecification based on API 610.

 

Does anyone have experience using Class S-1 material at this moment with any experience to share about material selection? Are there any issues with the use of Class S-1 material for naphtha service?

[Bobby Strain]

If your client is paying the bill, why not supply the material he has requested?

 

Bobby

[colt16]

Because there is responsibility on our part to highlight overspecifications. 

 

Also working with a budget, the savings can be transferred to other areas of the project.

[Zauberberg]

API 610 also states that S-3 or S-6 materials should be used if there is a presence of process water in Naphtha stream (reflux stream, product draw-off etc.), for temperatures below 175 degC. The class S-1 assumes virtually clean Naphtha stream, which may or may not be the case in your application.

[colt16]

I see your point. Thank you very much for your reply.

 

Naphtha we are working with is bought from the spot market (not produced). 

 

Thus if S-3 is sufficient for these services, perhaps S-6 is not required.