(Materials) 1

[PVRV]

Service high concentration of, hydrogen sulphide and chlorides. Service temperature is about 70 C. Flow Characteristics : Sand Abrasion. What materials would be recommended?

Anyone come across Hastelloy cladding for a cs vessel.

Any experience Gunite Linning or FBE for pressure vessels.

What choices are there for (typr) sacrafical anodes to be placed in a pressure vessel with titanium members.

Off-shore pipeline; is it possible to utilize both impressed current and sacraficial anodes for a marine pipeline. If so, how is isolation provided to avoid formation of protective calcareous coatings over the sacraficial anodes that would render them in-effective else over polarize which leads to rapid corrosion of the sacraficial anodes.


--thank you

 

[kenvlach]

Seems like many questions with too few details.

'Service high concentration of, hydrogen sulphide and chlorides. Service temperature is about 70 C. Flow Characteristics : Sand Abrasion. What materials would be recommended?'
---sounds like a pipe. do you have water or oil or gas (wet)? Is the sand on the outside? Is there seawater, too?

'Anyone come across Hastelloy cladding for a cs vessel.'
--There are several methods, see the Haynes' webpage below:

http://www.haynesintl.com/crafab/CRAcrl.htm

How about electroless nickel plating instead?

'Any experience Gunite Linning or FBE for pressure vessels.'
--temperature? cycling? solution? any solids for abrasion? agitation?
I don't think gunnite will be gas-tight for very long, if that matters. Is FBE fiberglass-epoxy? what P & T? This is pretty common for smaller sizes, but you need to choose a resin compatible with your solution at temperature. Vinylester resin is good for many acids, polyester is inferior. Maybe contact CRS:

http://www.conrest.com/coating.html

'What choices are there for (typr) sacrafical anodes to be placed in a pressure vessel with titanium members.'
--is the solution similar to seawater? are you trying to protect the titanium? If so, the galvanic series indicates almost every common metal is anodic, with Mg, Zn & Al most so. These anodes should also work if your pressure vessel is steel.

 

[PVRV]

Thank you for your responce:

1. Its a hydrocyclone (To seperate gas from crude no
there isnt any seawater) there is sand ingress
from the crude flowlines. The Salinity is high,
H2S content in both gas/liquid phase is high.


2. ENP is a nice thought; problem is H2S.

3. FBE is fusion bonded epoxy. Gunite will only
be applied to the lower half of the pressure
vessel. The solution is similar to brine + H2S
The pressure ranges is around 100 psi. thanx I liked
your reference here.


4. Titanium if galvanically coupled with
an alloy (CS) at low pH + H2S it will fail due to
hydrogen embrittlement. Any idea on what can be
galvanically coupled to it in such service conditions.

Thank you very much for your insights; I apologise I was referring to several pressure vessels and service conditions.

 

[PVRV]

water from crude