SS 316 & 316L Temperature effect

[puma9428]

Hello,

I have an issue that needs to be resolved, you don’t need to go into much detail other than a quick brief on the effects on SS 316 at process temperatures between 350 and 560 Deg.C. opposed to 316L.

Details:
Product is a pigment (an abrasive powder of <1um particle size), contains 5-10% ordinary silica sand (tonne/tonne). The pigment is inert, but there will also be a small percentage of chlorine, oxygen, CO2 and nitrogen entrained in the pigment. The chlorine will every now and again be in the form of HCl when we have large process upsets.

Regards,

Hugo

 

[JoeTank]

I made a quick check of the ASME VIII Code (1968 Edition... sorry, its the only one I have in-hand at this time) and it appears that you may have problems with temperature for some grades.

SA240-316L material is not suitable for use above 850 degrees F (450 degrees C).

SA240-316 material is suitable for Code use up to 1500 degrees F (820 degrees C). This sounds awfully high to me, so be sure to check out the current Code edition.

I have not attempted to address the environmental corrosion issues, just the strength issue per the ASME Code.

Hope this helps

Steve Braune
Tank Industry Consultants

http://www.tankindustry.com

 

[unclesyd]

As per Steve Braune's post the 316 S/S is Ok strength wise, but you could possibly run into some corrosion problems from the Cl and HCl. Being in abrasive service the 316 is going to stay in a condition that is amendable to corrosion form both the Cl(gaseous) and the HCl(gaseous). If the equipment is maintained at your stated temperatures during upsets and you have no areas to trap the Cl products you should be ok while running. I can only see some problems during a shutdown or outage where the atmosphere in the equipment drops below the dew point of the gases. You will probably get some”rust”which in turn will quickly abraded off your process.

Can you come back with a little more description of your equipment.

 

[puma9428]

Thank you for your help. The temperature and HCl is the big issue here. I belive we will select another material.
Regards,

Hugo