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Sodium carbonate pipe max velocity recommendation
3

Sodium carbonate pipe max velocity recommendation

Sodium carbonate pipe max velocity recommendation

(OP)
Dear all,

I have to size a pump wich discharge sodium carbonate (other name is soda ash),design parameters are: T°=122°F, density = 1147 kg/m3, %solid = 0.001 wt%.

My doubs is about pipe velocity consideration.
For the moment, I'm considering set max pipe velocity at 9.2 fps.

I looked for a handbook in web sites with velocity recommendations for sodium carbonate, but i couldn't found.

I'm worried about corrosion effect in stainless steel pipes (client stablished pipe material).

Can anyone help me to find a handbook online refference to design correct velocity pipe ?

RE: Sodium carbonate pipe max velocity recommendation

Stainless steel should be acceptable since carbon steel is also used, but watch the temperature of the slurry. Keep it below 130F

Like any aggressive slurry, you should size your piping for a maximum velocity of 3-5 fps



MJCronin
Sr. Process Engineer

RE: Sodium carbonate pipe max velocity recommendation

The slurry storage tank should be insulated and equipped with heating operating coils to maintain a temperature between 115-130°F.
https://www.solvay.us › en › binaries › Soda_Ash_Conversion_Guide-237418.pdf


Sodium carbonate is not particularly aggressive and 4-6 ft/sec is a typical velocity for a slurry. Sodium carbonate dissolves almost cmpletely in the slurry.

See page 6-9 for a piping diagram.

RE: Sodium carbonate pipe max velocity recommendation

Hi,
To me it has to do with erosion , are you sure about the solid content , seems very low !
My experience with soda ash and bicarbonate is the following : 10 m3/h of a 10% w/w aqueous solution in a 2 inches pipe (CS or SS ).
Pay attention to the solubility .
Good luck
Pierre

RE: Sodium carbonate pipe max velocity recommendation

"Crystals in the tank rapidly settle from the liquid, which is decanted from near the surface and recirculated to make up fresh slurry. Clear saturated solution for use is similarly decanted, although a brief settling period is needed after unloading to avoid turbidity. As supernatant solution is withdrawn, it is replaced with water through a perforated pipe manifold in the bottom of the tank. The water dissolves the sodium carbonate crystals as it rised through the slurry bed. Table 6-2 shows that a 30,000-gal. storage tank can hold 48 tons of soda ash as saturated solution and up to 116 tons as an 80% slurry."

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