INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS
If you want to learn more, please visit our website.
FIRST NAME
*
LAST NAME
*
*
MESSAGE
*
ADDITIONAL DETAILS
Thanks. We have received your request and will respond promptly.
Log In
Are you an
Engineering professional?
Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.
Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Eng-Tips Posting Policies
Wear material for slurry pipe
thread330-62512 Forum Search FAQs Links MVPsForum
Search
FAQs
Links
MVPs
(Mechanical)
(OP)
4 Jul 03 03:12We 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.
(Materials)
4 Jul 03 06:36The 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.
(Mechanical)
4 Jul 03 08:59I 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
You will get efficient and thoughtful service from SHANGLISHI.
(Materials)
4 Jul 03 22:26Slurry 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.
(Materials)
7 Jul 03 09:13I 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.
(Industrial)
1 Aug 03 17:35Check 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.
(Materials)
1 Aug 03 21:09Ceramics are a good option. You might find such parts made from SiC (try Schunk).
(Aerospace)
4 Aug 03 12:30There 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 ).
(Materials)
9 Jul 04 07:02You 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.
(Materials)
9 Jul 04 09:45Maddog88;
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.
(Materials)
12 Jul 04 10:41There 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
(Materials)
12 Jul 04 13:36Here is a material that we used to convey a very abrasive catalyst.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.
(Mechanical)
13 Jul 04 00:02Basalt 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
(Mechanical)
(OP)
13 Jul 04 19:49Thankyou all for your help. You have given me many options to to follow up.
Cheers
Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.
Click Here to join Eng-Tips and talk with other members! Already a Member? Login
No tracking! No ads!
All Glossary
Glaze, engobe and body slurries are suspensions and they are an integral part of ceramic production. In almost all cases slurries can exist because the electrolytic properties of clay particles present create a gel that suspends the other particles.
Ceramic slurries may be such as part of the processing of a material: For example, powders don't screen well below about 60 mesh, so a clay might be put into slurry form to enable sieving out of impurities and oversize particles (after which the water is removed). Slurries are also much better for magnetic separation to remove iron impurities. And clay suspensions are better for grinding in ball mills. Slurries also enable the removal of dissolved soluble salts present in some materials.
As noted, slurries often need to be dewatered. In the case of clay bodies that are mixed and wet-processed, this is normally done by filter pressing or centrifuging. For the production of a powder and pellets, spray and rotary dry are also common. All of these are energy-intensive.
Often slurries are such to enable their use in ceramic production (e.g. glazes, engobes, casting slips). Industries (suppliers and users) need to be able to efficiently and consistently mix slurries and transport, pump, spray, roll, pour, store and monitor and adjust their rheological properties. The science, materials and equipment associated with the handling of suspensions and slurries create an entire industry in itself (another is dedicated to the handling of powders).
The oil industry processes drilling mud in tremendous volumes, often doing so well below 200 mesh. How. They throw horsepower and PSI at problems! Decanting centrifuges are an example, hundreds of gallons a minute, and crystal clear water comes out one spout, fine slurry out another, and oversize particles out a third. They also employ multi-level screen shakers that can handle large volumes of slurry.
The company is the world’s best ceramic slurry pump supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.