Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Nitric Acid ( 98 %) Pump 2
- Thread starter cougarfan
- Start date
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
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
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
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
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
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
-
1
- Thread starter
- #4
MedicineEng
Industrial
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
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
-
1
- #7
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
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 40oC at these concentrations. There is also a reference to nonmetals worth reading.
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 40oC at these concentrations. There is also a reference to nonmetals worth reading.
- Thread starter
- #8
- Thread starter
- #10
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
YBG58
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
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
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
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:
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:
- Status
Similar threads
- Locked
- Question