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Procedure Of Draining Ammonia Tank Storage

Started by Guest_kalbi youssef_*, Feb 18 2004 06:07 PM

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#1 Guest_kalbi youssef_*

Guest_kalbi youssef_*
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Posted 18 February 2004 - 06:07 PM

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I'd like to know if there's a specific procedure for draining the remaining volume of ammonia liquid in atmospheric storage (double wall), we can drain the tank, with transfer pump, untill 0.30m level; our storage tank is 35m diametre, and 24m hight.

thinks a lot

#2 Kameswara Rao

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Posted 08 March 2004 - 01:41 PM

You may request
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Mail address: seetaram_n@murugappa.co.in

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#3 Guest_Ben Thayer_*

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Posted 08 March 2004 - 05:30 PM

I have been involved with emptying tanks that were 170 ft diameter and 64 feet sidewall for 30,000 tons of liquid ammonia at -28°F.

We would use a small transfer pump from a side sump until we got to the last 6" in the tank and then turn up the tank's foundation heaters to vaporize the rest.

The requirements to empty the tank really need to be addressed during the design of the tank but rarely really are.

Our tanks' floor had a slight cone shape so that the center was a few inchs higher than the outside. This helped reduce the amount of liquid when there was only 6" remaining at the outside edge of the tank.

Depending on the sump arrangement and the pressure design of the tank, you can raise the tank's operating pressure a few inches water column.

We typically operated the tank at 6" to 8" of water column but would raise the pressure to 16" to keep suction to the transfer pump longer. Our transfer pump was a temporary pump and much smaller than the normal pumps used for loading. You have to be careful doing this because the relief devices could be set at 20 to 27" of water column. But we could do this with the refrigeration compressors keeping up quite well because with so little liquid in the tank, there was very little heat gain.

Good luck. If you are emptying the tank for inspection/repair purposes, you will want to do a search for Ammonia Stress Cracking and pay careful attention to removing the oxygen when you place the tank back in service.
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