Nitric Acid ( 98 %) Pump 2

[cougarfan]

We have a process which requires nitric acid to be pumped from tank to final location. We have been using Ansimag pumps which do not last. Anyone have any success in this with any type of pump?

 

[poppeye]

dideyjohn,
First, what type of failures have you had. Rear containment failure or shafting fractures or front SIC fractures. Ansimag pumps are extremly reliable for a stable and constant flow. What they can't handle is system shock from control valves slamming causing axial thrusting of the impeller on the shaft. I have seen Ansimag pumps break through the rear containment shells. Even though the manufacturer says the Kevlar shell is almost indestructible. Also I have seen the impeller magnest become attacked by the acid. Usually from improper handling of the impeller during the trimming process. One small nick in the coating and the acid can attack the magnets.
If the failure is from system shock from pneumatic valves slamming shut, sucess has been achieved by using a delay closing relay so the valve closes slowly over a 3-5 second period. This solved one of my customers failures.
Try looking into Innomag pumps. These pumps employ hydraulic thrusting ring incorporated into the Impeller that helps relieve the pump from thrusting damage. I have instaled, started and monitored over 3 dozen during the past 6 months with all working flawlesly.

Poppeye

 

[poppeye]

dideyjohn,
Was thinking about your problem last night, what type of power monitor, if any do you have on your pumps. It is highly recommended that a power monitor be installed to protect your pump from either right or left curve operation.
Ansimag in the past has offered a monitor that monitors amperage only. This type of monitor does not effectively cover low flow situations if your curve is relativly flat. Instead try a load control monitor that monitors h.p. Information on this type of monitor can be obtained at

http://www.loadcontrols.com.

Special care needs to be paid to setting controls well above the mcf of your pump or the heat generated will surely do extensive damage.

Poppeye

 

[cougarfan]

We just found out that ansimag does not have a pump that has handled 98 % nitric acid.....
any other suggestions

 

[longeron]

I know of a plant that uses a Durco Pump, I think they've used Alloy 20 hardware. As long as they had 98% or higher, the temperature wasn't too high, and they weren't deadheading it, it ran well.

 

[MedicineEng]

cougarfan:
I did some research and I found out that,(is was a surprise for me)that 316L was resistant to Nitric acid but with a limitation up to 20C, as it is Alloy 20, but I think that this last one should be more expensive. Or you can try a Teflon pump, providing that the temperature doesn't rise above 70F.

Hope that helps
PR

 

[25362]

Ansimag and Innomag pumps are offered by a series of manufacturers/dealers. Anyhow, Sundyne indeed mentions this acid in their web-site brochure. It can be seen in

http://www.sfh.com/index.cfm?go=/displayProduct.cfm&type=1&page=101

If corrosion and suitable metallurgies are the subject of this thread, Perry VI, Table 23-2, gives interesting information for various concentrations of nitric acid and a range of temperatures.

However, for 98% concentrations, SS 304L, cast iron with 14% Si, A-610 SS with 4% Si, and A-611 SS with 6% Si, have been highly recommended in the Metals Handbook (Vol 13: Corrosion). More expensive Chlorimet-3, Hastelloy C-276, 20Cb-3, Worthite, Zirconium, Titanium, etc., are also mentioned when high velocities are present.

Both sources claim that Aluminum alloys (1100, 5052, 5454) resist well corrosion below 40[sup]o[/sup]C at these concentrations. There is also a reference to nonmetals worth reading.

 

[cougarfan]

25362,

For you and others, Ansimag does not have a pump out there that has survived high concentrations of nitric acid. They sold lots of pumps, but not have lasted.

 

[25362]

I wonder if anyone has tried out gold (very thin film) electroplating for use with nitric acid.

 

[cougarfan]

Imomag has a pump out there with reference that has no issues with high percentage nitric - thanks to poppeye who refferred me.....

 

[YBG58]

Dear Cougarfan

We have been successfully using Friatec Rhineutte, Germany make pumps with MOC as 1.4361 in loading our road tankers ( @10 MT)from our product tank of 98.5 to 99.5% Concentrated Nitric acid (Plinke Germany's know-how plant)
You can visit / contact at

http://www.friatec.de

YBG58

 

[YBG58]

Dear Cougarfan

I'm sorry; Friatec you can try, but my pumps are from Ochsner (Vogel Pumpenfabrik, Austria) and are giving good life of @2 years for wetted parts; we use it for selling / loading the road tankers (yearly 60000MT).

Regret the inconveniece!

YBG58

 

[YBG58]

Contact Information

Name of Company: Pumpenfabrik E. Vogel
Address: Ernst Vogel-Strasse 2
2000 Stockerau
Austria

Tel: 00 43 2266-604
Fax: 00 43 2266-65311
E-mail: info@vogel-pumpen.ittind.com
Home Page:

http://www.vogel-pumpen.ittind.com