Erosion of desanding liners
Erosion of desanding liners
(OP)
Dear all,
We are facing severe erosion problems on desnding liners installed on produced water system. These desanding liners are of DSS (UNS 31803)and a part of multicyclone desanding vessel.
We can understand some erosion on the liners due to sand but the rate at which erosion is taking place is a bit of surprise. Please find attached results of boroscopy on damaged liners which were found within 6 weeks after installation.
Please advise if anyone has faced similar problem? Any recommendation to resolve the problem? Desanding system is operating at appx 25-30 barg @ ambient temperature.
Regards
Sanj
We are facing severe erosion problems on desnding liners installed on produced water system. These desanding liners are of DSS (UNS 31803)and a part of multicyclone desanding vessel.
We can understand some erosion on the liners due to sand but the rate at which erosion is taking place is a bit of surprise. Please find attached results of boroscopy on damaged liners which were found within 6 weeks after installation.
Please advise if anyone has faced similar problem? Any recommendation to resolve the problem? Desanding system is operating at appx 25-30 barg @ ambient temperature.
Regards
Sanj





RE: Erosion of desanding liners
The point is that the surface of the liner is affected by both corrosion and erosion. Can you provide some details of the produced water composition, velocity in the liners, temperature, etc?
RE: Erosion of desanding liners
Why didn't you select a more corrosion and/or erosion resistant alloy?
In this service I have used either High Cr white cast iron, Ni-Hard, or a cobalt based alloy.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Erosion of desanding liners
This is not a case of corrosion since we have not found any signs of corrosion or erosion in the piping and the vessel. Erosion is only reported in the liners which are inside the vessel. Liners will no doubt experience higher velocity compare to velocity in the piping due to vortex formation in the liner conical section and gravity separation of the sand.
UNS 31803 was considered for the piping and desanding vessels mainly due to better erosion resistance in sand service. Liners were propritary design with only two material choices (DSS and Ceramic)available from the vendor. Ceramic is fragile and require special handling and therefore preferance was given for DSS.
Regards
Sanj
RE: Erosion of desanding liners
RE: Erosion of desanding liners
This was not based on a single vendor, most of the vendors came back with the choice of only DSS or ceramic for the liners. I also hope that DSS is not first time utilized for the desanding liners. Can you please share your experience on MOC other than DSS or ceramic for the liner material and suppliers.
Do not have data handy with me on pH and CO2 but we have entire system (connected piping, desanding vessel etc) in DSS and do not have any signs of corrosion. There are however some damage on inline instruments which is possibily due to sand erosion.
RE: Erosion of desanding liners
Cheers,
gr2cessels
RE: Erosion of desanding liners
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Erosion of desanding liners
DSS is used in this service. Suitability largely depends on a combination of corrosion and sand morphology.
Your only real option is to go to the ceramic liners or engineer a replacement yourself.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Erosion of desanding liners
Thanks again for yoru replies.
Regards
Sanj
RE: Erosion of desanding liners
Then try and find out exactly what the actual density and type of sand was that went through it.
Vendors can only work with what they are given and if you have particularly hard "sand" then things won't work out as planned.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Erosion of desanding liners
The surface hardness can achieve ranges up to 1200 HV0,05.
The hardness can be achieved very uniform upon the components geometry, so also in the bores of these liners. Galling issues can be avoided as well during assembly.
Please contact me case you need any additonal information!
Best regards,
Jeroen
Contact Info:
nl.linkedin.com/pub/jeroen-heijneman/14/a8/842