Wear material for slurry pipe

[MadDog88]

We currently use a carbon steel reducer on the discharge of a 3-2 Warman slurry pump (slurry is iron based, approx 90 deg C). The carbon steel discharge spool wears regularly and I was thinking about replacing it with a stainless steel spool, possibly 304 or 321. Will this give me better wear performance? Is this due to work hardening or another mechanism? What grade of stainless steel gives best wear resistance? I was also thinking about a ceramic insert although I was concerned about reducing the discharge inner diameter too much as it is already quite small.
Thanks in advance for your help.

 

[gieter]

The problem is that wear is a combination of factors. In your case I would assume that corrosion plays an important part (due to the temperature and the iron content). I’m not well into this but there is a dedicated corrosion forum on this site.

If you only consider the wear of the slurry, we don’t have good results with stainless. The work hardening only occurs when there is impact and this will probably not be the case in your application.

Have you considered the high-chromium white cast irons? They are used in sand slurry applications. When you have more than 10% Cr they are corrosion resistant and they are very abrasion resistant.

The only drawback is their lack of ductility. If the component is mechanically stressed you should be very careful. In large dredging applications white cast irons are sometimes used as a liner, with the steel casing having the structural function.

 

[macmil]

I would try first ceramic ; you could use a trowelable to rebuild a worn spool piece to the original dimesions.. If the geometry works, i would also try ceramic hex tiles bedded in an a epoxy. Another option is to rebuild with a chrome carbide overlay; depending on wear you may have to do some local build up the carbon steel first. If your dimensional considerations do not leave you much room, then you could perhaps do a HVOF overlay about say 0.020" thick on a new spool piece. there are lots of material options for this, including tungsten carbide etc.
good luck

 

[arunmrao]

Slurry pumps are used in highly abrasive environment. ceramic tiled casing can be considered,but then the geometries will have to be considered with respect to available shapes of tiles.

Simplest solution is to get a casting in Ni Hard or high chrome iron. The holes for locating bolts can be as ast or have ms inserts in those spots and drill later. These are fairly common in pumps used for pumping slurry.

Can you please tell the material of construction of the pump casing, impeller, wear plate etc?

SS will not be helpful so also any weld overlays as this would be worn out soon.

 

[stanweld]

I would not recomend the stainless steel. Rubber lined carbon steel pipe has been used successfully in slurry applications. I would have to know more about your slurry to give better recomendations - particle size and velocity.

 

[tsapa]

Check out this link -

http://www.ceresist.com/products/fittings/reducers.htm.

This company makes ceramic reducers (and other ceramic-lined components) out of solid ceramic. A good alternative to thermal sprays, and definitely better than tiling reducers.

 

[JimMetalsCeramics]

Ceramics are a good option. You might find such parts made from SiC (try Schunk).

 

[tmtresearch]

There are several coatings that would give you the results that you are looking for. We have used thermal spray overlays and diffusion alloys (Boriding) in slurry service with excellent results. Feel free to contact me directly if you would like additional information (matt.hinckley@tmtresearch.com).

 

[rnd2]

You will be way ahead switching from C steel to ss. You will go from months to years. Be careful to check how much Cl is present.

 

[metengr]

Maddog88;
We have slag lines that take bottom ash from PC boilers and slag products from cyclone-fired boilers out to settling ponds under high pressure water below 100 deg c.

I would recommend either Ni-Hard cast pipe or ceramic lined pipe for fittings. We have used Ni-Hard and ceramic-lined fittings for years with great success. I would not use stainless lined pipe or fittings.

 

[EdStainless]

There is no doubt that NiHard will give you great life. Ceramic liners work very well also.
However, if cost becomes the limiting factor you might consider stainless, look at alloy 2205. This is a duplex grade and is farily strong to start with. The surface will harden in abrasion service.


= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[unclesyd]

Here is a material that we used to convey a very abrasive catalyst.

http://www.abresist.com/materials_at_a_glance.htm

As a stop gap measure you might want to weld overlay the spool with Hastalloy C. A little expensive but will do a good job.

 

[rmw]

Basalt lining is also used for abarasion resistant piping, and can be cast into fittings. That stuff will resist wear like you won't believe. Put it in and retire, and let your replacement worry about it.

rmw

 

[MadDog88]

Thankyou all for your help. You have given me many options to to follow up.
Cheers